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APPENDIX D
Geomorphic Assessment
BOEING PLANT 2 HABITAT RESTORATION GEOMORPHIC ASSESSMENT
Habitat Project Design, Boeing Plant 2 Seattle/Tukwila, Washington
Submitted to: The Boeing Company, Seattle, Washington
Submitted by: Confluence Environmental Company
Seattle, Washington
November 14, 2011
Project 0148440050
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p:\boeing\004 shoreline habitat\3000 reports\geomorphicassess\2‐boeing habitat support ‐ report 111411.docx ⎪ 11/14/2011
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TABLE OF CONTENTS
BACKGROUND ....................................................................................................................................... 1
METHODS .............................................................................................................................................. 1
Hydraulic Modeling ........................................................................................................................... 1
Boundary Conditions .................................................................................................................. 2
Steady and Unsteady Scenarios ................................................................................................. 3
Cross‐Sections ............................................................................................................................ 4
Sediment Mobility and Bed Stability Analysis ................................................................................... 5
RESULTS ................................................................................................................................................ 6
Bed Scour due to Tides and Riverflow ............................................................................................... 6
Sediment Deposition in the Interior of the Restoration Area ............................................................ 8
CONCLUSIONS ...................................................................................................................................... 9
REFERENCES ........................................................................................................................................ 10
Figures
Figure 1 Final Grading Surface and Modeling Cross‐Sections
Figure 2 Velocity and Water Surface Elevation for 14,400 cfs Flow and Spring Tides Unsteady HEC‐RAS Scenario at RS 1200
Figure 3 Project Graded Area Exposed to Increase in Shear Stress at RS 1400
Appendices
Appendix A HEC‐RAS Steady and Unsteady Model Summary Table (22 scenarios)
Appendix B HEC‐RAS Output for 4‐foot Tide Scenario
Appendix C HEC‐RAS Output for 8‐foot Tide Scenario
Appendix D HEC‐RAS Output for 12‐foot Tide Scenario
Appendix E Existing Conditions HEC‐RAS Model Input and Output Files for All Scenarios (on CD)
Appendix F Project Conditions HEC‐RAS Model Input and Output Files for All Scenarios (on CD)
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BOEING PLANT 2 HABITAT RESTORATION GEOMORPHIC ASSESSMENT Habitat Project Design, Boeing Plant 2 Seattle/Tukwila, Washington
BACKGROUND
In accordance with a Consent Decree between the Natural Resource Trustees (the Trustees) and The Boeing Company (Boeing), Boeing has agreed to construct two habitat restoration projects in an area at Boeing Plant 2 between approximately river mile (RM) 2.9 to RM 3.6 of the Lower Duwamish Waterway (LDW) located in Seattle, Washington. The two projects will restore and create riparian and off‐channel habitats in the LDW in an area where channelization and industrialization have largely eliminated these types of habitats. The two projects are briefly described as follows:
North Site – The creation of a blind channel at the north end of Plant 2 adjacent to Boeing’s Building 2‐122 that will restore shoreline and create off‐channel habitat; and
South Site – The removal of an overwater portion of Building 2‐41 at the south end of Plant 2 with subsequent restoration of shoreline along the Southwest Bank and Building 2‐41.
A preliminary design for these projects has been developed by AMEC as part of the Consent Decree process. The preliminary restoration design for in‐stream habitat includes riverbed restoration activities at and above about 2 feet mean lower low water (MLLW). Previous analysis has considered scour due to ship wake and propeller wash and determined that scour would be minimal on the bench area above 2 feet MLLW (Windward and QEA 2008; Pentec et al. 2001). The final design of the projects will be influenced by environmental factors, geotechnical conditions, habitat parameters, and geomorphic investigations. This report presents the geomorphic investigation completed by Confluence Environmental Company (CEC). The geomorphic study addresses two key questions:
Will the proposed modifications to the waterway bank result in a detrimental effect to hydraulics and sediment mobility in the main channel of the LDW?
Will the restored areas be stable and function as designed under the anticipated hydraulic and geomorphic conditions in the waterway including high river flows, and variable tidal conditions?
METHODS
CEC completed hydraulic modeling of existing and modified channel configuration for the project area. We completed a quantitative and qualitative sediment mobility and bed stability analysis, which included a bottom shear stress analysis of the in‐stream habitat.
Hydraulic Modeling
CEC developed a HEC‐RAS hydraulic model (model) that included 29 cross‐sections between RM 2.6 to RM 3.7 of the LDW (Figure 1). We modeled both the existing and modified (project) channel
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configuration and compared the results to assess changes in hydraulics and sediment transport. The Boeing Plant 2 habitat restoration projects, North Site and South Site, will be located between approximately RM 2.9 and RM 3.6. CEC identified the modeling boundary conditions that resulted in highest shear stress in the channel for large flow events for both existing and project conditions under a range of different tidal conditions.
HEC‐RAS provides water surface elevations, channel velocity, hydraulic slope, and channel shear stress for each cross‐section during different flow and tidal conditions. HEC‐RAS is a one‐dimensional model that does not account for stratified flows or variations in cross‐channel flow. Despite its limitations, HEC‐RAS was selected for this analysis due to the ease of use and the ability to develop useful results through careful selection of boundary conditions and scenario parameters.
Boundary Conditions
The downstream boundary conditions used for the unsteady simulations were water surface elevations for 2 days of 30‐minute spring and neap tides. CEC chose a representative spring and neap tide based on a year of predicted water levels for the Duwamish Waterway Eight Avenue South tide prediction station, which is located near the project area (EZ Fishing 2011). At the prediction station, the mean tide level is +6.4 feet MLLW, mean range is 7.5 feet, and spring tide range is 11.1 feet. The elevation range of water surface elevations for the chosen spring tide was from +0.3 feet to +11.9 feet MLLW. The elevation range of water surface elevations for the neap tide was from +1.3 feet to +10.5 feet MLLW. For the steady simulations the downstream boundary conditions used were +4 feet, +8 feet, and +12 feet MLLW.
The upstream boundary conditions used were the 1‐year (100‐percent annual chance), 2‐year (50‐percent annual chance) flow, 100‐year (1‐percent annual chance) flow, and a flow 20 percent greater than the 100‐year flow (Table 1). The 1‐year, 2‐year, and 100‐year flows are based on an analysis of USGS gage records documenting high‐flow events in the Green River from 1961 to 2004 (Windward and QEA 2008). The flows in the Green River are controlled by the Howard Hanson Dam, which is located approximately 65 miles upstream of the LDW. Flow management at the dam ensures that peak flow events in the Green River at Auburn, Washington do not exceed 12,000 cubic feet per second (cfs).
Table 1. Peak flow volume for the Green River
Recurrence Interval
Percent Annual Chance
Flow (cfs)
1 100 1,340 2 50 8,400
100 1 12,000 100+ <1 14,400
Recognizing that there will be post‐construction monitoring requirements associated with the restoration projects, we considered how to determine an appropriate peak flow threshold that would
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trigger a special monitoring event to assess whether the restoration site is negatively affected by peak flow events. Although the river is managed to limit peak flow to 12,000 cfs, maintenance concerns at the Howard Hanson Dam affected the operation of the dam during the 2010 – 2011 wet season and created the potential for the managed peak flow limit to exceed 12,000 cfs. That potential was not realized and the maintenance issues have since been addressed, restoring the facility to normal operation. We elected to include in the analysis a flow of 14,400 cfs, which is 20 percent larger than the managed peak flow of 12,000 cfs. The flow of 14,400 cfs accounts for the small additional flow from tides and peak flow exceedance at the Howard Hanson Dam. This element of our analysis provides information necessary to determine an appropriate peak discharge value that would trigger a special monitoring event to assess the effects of the peak flow event on the restoration projects at Plant 2.
Steady and Unsteady Scenarios
CEC developed and modeled six steady flow and 14 unsteady flow HEC‐RAS scenarios. Appendix A includes details about the file structure and boundary conditions for the 22 simulations. We used the unsteady simulations to identify the point in the tidal cycle when the highest velocities and shear stress in the channel will occur during different river flow conditions. These results showed that the highest velocities and shear stresses occur approximately 30 minutes before the lowest water surface elevation associated with the spring tide and the highest river discharge conditions (14,400 cfs). Table 2 presents the unsteady simulations with the highest velocities and shear stress in the main channel for the 14,400 cfs flow scenarios. Figure 2 shows velocities and water surface elevations for a cross‐section downstream of the project area (river station in feet [RS] 1200) for the 14,400 cfs upstream boundary condition and spring tide for existing and project scenarios.
Table 2. HEC‐RAS unsteady model scenarios with 14,400 cfs flow
Model Scenario Downstream
Water Surface Elevation (feet MLLW)
Cross‐Section Geometry
Maximum Velocity at RS 1200
Existing: Neap Tide 1.3 to 10.5 Existing 1.6 Existing: Spring Tide 0.3 to 11.9 Existing 1.7 Project: Neap Tide 1.3 to 10.5 Project1 1.6 Project: Spring Tide 0.3 to 11.9 Project1 1.7
1Project geometry includes existing geometry for all elevations below +2 feet MLLW.
The six steady flow model simulations determined the shear stress values within the intertidal zone in which the waterway bed and banks will be modified. Although the lowest water surface elevation evaluated in the modeling effort was approximately 0.0 feet MLLW, modifications to the waterway bed and banks will occur only above about +2 feet MLLW along the east bench of the LDW. Therefore, a range of different water levels above +2 feet MLLW were chosen. The simulations included downstream boundary conditions of +4 feet, +8 feet, and +12 feet MLLW for both existing and project scenarios (Table 3).
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Table 3. HEC‐RAS steady model scenarios for existing and project conditions
Model Scenario Downstream
Water Surface Elevation (feet MLLW)
Upstream Maximum Flow
(cfs)
Cross‐Section Geometry
Existing: 4 ft MLLW +4 14,400 Existing Existing: 8 ft MLLW +8 14,400 Existing Existing: 12 ft MLLW +12 14,400 Existing
Project: 4 ft MLLW +4 14,400 Project1 Project: 8 ft MLLW +8 14,400 Project1
Project: 12 ft MLLW +12 14,400 Project1 1Project geometry includes existing geometry for all elevations below +2 feet MLLW.
CEC used the hydraulic slope determined for each cross‐section in the project area and the depth of water within the modified area to calculate bottom shear stress.
Cross‐Sections
CEC included 29 cross‐sections in all 22 of the modeling scenarios. The cross‐sections were numbered from downstream to upstream from RS 0 to RS 5651. The cross‐sections spanned from RM 2.6 to RM 3.7 along the LDW. CEC used the same Manning’s n values for all cross‐sections to represent a fairly uniform bed in the LDW. The n values were 0.05, 0.025, and 0.05 for the west bench, channel, and east bench, respectively. The geometry of the existing cross‐sections was based on a combination of bathymetry data collected by David Evans and Associates (DEA) and Duane Hartman & Associates, Inc. (DHA).
As part of the LDW Remedial Investigation, a multibeam bank‐to‐bank bathymetric survey was conducted by DEA. In 2000, a survey of the 2‐40s Under‐building area was conducted by DHA. In 2011, DHA also conducted a survey of the Plant 2 shoreline from the toe of the slope to 150 feet inland of the top of the bank (excluding the 2‐40s Under‐building area). As part of this work, DHA also combined the bank survey with the LDW bathymetric survey to provide an integrated bank/waterway bottom survey in the vicinity of Plant 2.
The modeling required that each cross‐section extend to the top of the bank. On the west side of the LDW and north and south of Plant 2 on the eastern shoreline, survey data were limited to the LDW to the toe of the bank slope. Using aerial photography and the bathymetric data, the slope from the shoreward extent of the bathymetric data to the top of the bank was estimated by AMEC to create top‐of‐slope to top‐of‐slope cross‐sections for the modeling.
The project cross‐sections were based on the existing bed elevations below +2 feet MLLW. For transects in the Plant 2 restoration area, the project cross‐sections included changes in bed elevations above +2 feet MLLW. The geometry of these cross‐sections was based on the preliminary habitat restoration project design prepared by AMEC.
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Sediment Mobility and Bed Stability Analysis
CEC performed a sediment mobility and bed stability analysis building on the hydraulic results of the modeling effort. We used the hydraulic radius calculated with the hydraulic model to calculate the fluid shear stress for different depth scenarios on the post‐construction graded surfaces. We calculated the fluid shear stress (τb) on the post‐construction graded surfaces by multiplying the hydraulic slope (S) and depth (h) determined by the model and the unit weight of water (pg) (Equation 1).
(1) τb = pghS
This approach to calculating shear stress (τb) on the post‐construction graded surfaces is an approximation of the following equation (Equation 2) that makes use of the hydraulic radius (R) instead of depth (h):
(2) τb = pgRS
We used Equation 1 to estimate cross‐channel variations in shear stress by using depths that varied across the channel with bathymetry. Depth is a close approximation of hydraulic radius when considering a unit width of the flow.
We evaluated the scour potential by comparing the fluid shear stress to the bed shear strength which is characterized by a critical shear stress (τc). The Shields diagram, based on empirical sediment mobility data, is used to determine a critical bed shear stress that defines the threshold of sediment mobility for a given size of sediment. If fluid shear stress on the bed exceeds the critical shear stress (τb > τc), then scour will occur in proportion to the magnitude of the excess shear stress. Excess shear stress is the difference between bed shear stress and critical shear stress (Equation 3).
(3) τexcess =τb ‐ τc
Critical shear stress values can vary widely throughout the LDW (Windward and QEA 2008). The reported values of critical shear stress in the LDW bed ranged from approximately 0.1 to 0.5 Pascal (Pa) (Windward and QEA 2008). The bed shear stress values predicted by the sediment transport model (STM) for the 100‐year flow event during ebb tide conditions show that in the LDW near the restoration area, bed shear stress varies from 0 to 0.76 Pa, with the greatest shear stress value along the boundary closest to the navigation channel (Windward and QEA 2008). The STM analysis uses a critical shear stress of 0.16 Pa for existing sediments (Windward and QEA 2000). The STM report presents model results predicting that for portions of the existing waterway bed within and at the edge of the navigation channel, sediments near the restoration area would be mobilized in a 100‐year flow event.
The proposed backfill in the restoration areas is Class 2 sand (WSDOT Specification No. 9‐03.1(2)B). Class 2 sand ranges in size from approximately 0.15 millimeter (mm) (U.S. No. 100 sieve) to 4.75 mm (U.S. No. 4 sieve). The median diameter of Class 2 sand is approximately 1 mm. Based on the Shields diagram, 1‐mm sand corresponds with a critical shear stress of approximately 1.0 Pa. A critical shear stress of 0.3 Pa corresponds with an assumed median grain diameter of 0.5 mm. We assume that the
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near‐bed critical shear stress for the restoration area, which will be covered with Class 2 sand, ranges from approximately 0.3 Pa to 1.0 Pa.
RESULTS
Bed Scour due to Tides and Riverflow
All 22 model simulations showed that there will be minimal change in velocity (less than 0.1 foot per second) and no change in bed shear stress along any of the cross‐sections due to the project. The project will enlarge the channel cross‐section and expose a larger area of the east bank of the LDW to river flow. CEC calculated shear stress on post‐construction areas on the east bank for all project steady flow scenarios (i.e., +4 feet, +8 feet, and +12 feet MLLW downstream boundary condition). Detailed HEC‐RAS results for these simulations is presented in Appendix B (+4‐foot scenarios), Appendix C (+8‐foot scenarios), and Appendix D (+12‐foot scenarios). Appendix E and Appendix F include model input and output files for the existing conditions and project conditions, respectively.
We chose four representative cross‐sections to analyze in more detail, two located in the North Project Site (RS 1400 and RS 1800) and two located in the South Project Site (RS 4600 and RS 5000) (Figure 1). Figure 3 shows the existing and project bed elevations and water surface elevations for +4 feet, +8 feet, and +12 feet MLLW downstream boundary condition scenarios at RS 1400. Additionally, the figure shows the graded area exposed to an increase in shear stress due to the project.
The calculated shear stresses for post‐construction graded areas along these four cross‐sections are presented in Tables 4, 5, 6, and 7 for the downstream boundary condition scenarios (i.e., +4 feet, +8 feet, and +12 feet MLLW). For all scenarios, the fluid shear stress on the graded area will be less than or equal to approximately 0.5 Pa. Although the critical shear stress may be exceeded for a short time, the higher bed shear stress will not be sustained. For significant scour to occur, a higher shear stress would need to be sustained. Therefore, potential scour of the post‐constructed area will likely be minimal and will not affect the quality of the constructed habitat.
Table 4. Shear stress on post‐construction graded areas along RS 1400 (North Site) Bed
Elevation (feet MLLW)
Water Surface Elevation
(feet MLLW)
Water Depth (feet)
Slope Shear Stress (lb/sq ft)
Shear Stress (Pa)
3.00 4.08 1.08 0.000039 0.0026 0.13 2.50 4.08 1.58 0.000039 0.0038 0.18 2.00 4.08 2.08 0.000039 0.0051 0.24 3.00 8.04 5.04 0.000022 0.0069 0.33 2.50 8.04 5.54 0.000022 0.0076 0.36 2.00 8.04 6.04 0.000022 0.0083 0.40 3.00 12.03 9.03 0.000012 0.0068 0.32 2.50 12.03 9.53 0.000012 0.0071 0.34 2.00 12.03 10.03 0.000012 0.0075 0.36
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Table 5. Shear stress on post‐construction graded areas along RS 1800 (North Site) Bed
Elevation (feet MLLW)
Water Surface Elevation
(feet MLLW)
Water Depth (feet)
Slope Shear Stress (lb/sq ft)
Shear Stress (Pa)
3.00 4.08 1.08 0.000064 0.0043 0.21 2.50 4.08 1.58 0.000064 0.0063 0.30 2.00 4.08 2.08 0.000064 0.0083 0.40 3.00 8.04 5.04 0.000029 0.0091 0.44 2.50 8.04 5.54 0.000029 0.0100 0.48 2.00 8.04 6.04 0.000029 0.0109 0.52 3.00 12.02 9.02 0.000017 0.0096 0.46 2.50 12.02 9.52 0.000017 0.0101 0.48 2.00 12.02 10.02 0.000017 0.0106 0.51
Table 6. Shear stress on post‐construction graded areas along RS 4600 (South Site) Bed
Elevation (feet MLLW)
Water Surface Elevation
(feet MLLW)
Water Depth (feet)
Slope Shear Stress (lb/sq ft)
Shear Stress (Pa)
3.00 4.31 1.31 0.000048 0.0039 0.19
2.50 4.31 1.81 0.000048 0.0054 0.26
2.00 4.31 2.31 0.000048 0.0069 0.33
3.00 8.15 5.15 0.000021 0.0067 0.32
2.50 8.15 5.65 0.000021 0.0074 0.35
2.00 8.15 6.15 0.000021 0.0081 0.39
3.00 12.08 9.08 0.000011 0.0062 0.30
2.50 12.08 9.58 0.000011 0.0066 0.31
2.00 12.08 10.08 0.000011 0.0069 0.33
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Table 7. Shear stress on post‐construction graded areas along RS 5000 (South Site) Bed
Elevation (feet MLLW)
Water Surface Elevation
(feet MLLW)
Water Depth (feet)
Slope Shear Stress (lb/sq ft)
Shear Stress (Pa)
3.00 4.30 1.30 0.000073 0.0059 0.28 2.50 4.30 1.80 0.000073 0.0082 0.39 2.00 4.30 2.30 0.000073 0.0105 0.50 3.00 8.13 5.13 0.000036 0.0115 0.55 2.50 8.13 5.63 0.000036 0.0126 0.61 2.00 8.13 6.13 0.000036 0.0138 0.66 3.00 12.07 9.07 0.000019 0.0108 0.51 2.50 12.07 9.57 0.000019 0.0113 0.54 2.00 12.07 10.07 0.000019 0.0119 0.57
Sediment Deposition in the Interior of the Restoration Area
The movement of water and sediment into and out of the interior of the restoration area would be limited to a backwater channel upstream of Slip 4. At 12 feet MLLW, the tidal water could extend approximately 450 feet into the interior. Above 10.4 feet MLLW, the tidal water would overtop the berm between the main channel and the small backwater channel. At 10.4 feet MLLW, the entrance to the channel would be approximately 110 feet wide and 6.6 feet deep. Velocities due to tidal flow for flooding and ebbing spring tides in the backwater channel would be slow based on the open configuration of the backwater channel. Tidal flow will have little capacity to flush accumulated sediment from the backwater channel. Since the Duwamish Waterway is generally a net depositional environment, a small amount of sediment may accumulate within the backwater channel over the long term comparable to the ambient sediment deposition rates in this setting. Sediment studies that have been completed for the LDW show that sediment deposition on the bench occurs at a rate of 0.5 to 1.0 centimeters per year (cm/yr) (Windward and QEA 2008). The sediment deposition rates within the backwater channel would likely be less than 0.5 cm/yr since the backwater channel is not located in the main flow path of the waterway and a smaller volume of water and sediment will enter the backwater channel compared to the main waterway channel.
Groundwater seeps are present within the intertidal zone of the Duwamish Waterway bank in the vicinity of the restoration area. We anticipate that during low tide conditions, groundwater seeps will maintain a trickle of flow through the backwater channel. The slope of the channel is sufficiently steep that even a trickle of flow will cut into the waterway bed to form small rivulets at low tide conditions. These features will provide habitat complexity and ecological benefit.
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CONCLUSIONS
The restored waterway bed will not affect the water surface elevations, shear stress, velocities, and sediment mobility in the main channel of the LDW. Based on the hydraulic modeling results, the habitat restoration project will result in minimal changes in shear stress and water surface elevations throughout the LDW. Since the restoration is located on the upper east bench of the LDW above +2.0 feet MLLW, the grading due to the project results in a minimal increase in cross‐section area.
High river flows and variable tidal conditions will have a minimal effect on sediment mobility in the restored area. The bed shear stress along the shoreline in areas that will be graded will generally be less than 0.5 Pa even during peak flow and tide conditions. During spring tides and large riverflow conditions, there will be minimal movement of sediment at the perimeter of the habitat restoration area. Potential scour of the post‐constructed area will likely be minimal and will not affect the quality of the constructed habitat.
The analysis utilized a design flow of 14,400 cfs at the restoration site, which accounts for tidal flow and is 20 percent greater than the managed 100‐year peak flow event of 12,000 cfs at the Auburn gage. The restoration area will maintain stability of its bed sediments over the range of flows up to 14,400 cfs. We recommend monitoring of the restoration site occur in the event of a peak flow event in excess of 10 percent more than the 100‐year flow (13,200 cfs) at the Auburn gage to determine through direct observation if physical modifications occurred during the event that impair the ecological performance.
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REFERENCES
CEC (Confluence Environmental Company). 2011. Appendix J, Geomorphic and sediment transport evaluation, in AMEC Geomatrix, Inc., and Floyd|Snider, Inc., 2011, Duwamish Sediment Other Area and Southwest Bank Corrective Measure Alternatives Study, Boeing Plant 2, Seattle/Tukwila, Washington. Prepared for The Boeing Company, Seattle, Washington.
EZ Fishing. 2011. Daily Tides in Duwamish Waterway, Eighth Avenue South. Available: www.ezfshn.com/tides/usa/washington/Duwamish%20Waterway,%20Eighth%20Ave.%20South/ (accessed July 13, 2011).
Pentec (Pentec Environmental, Inc.), Hartman Consulting Corporation, and Floyd Snider McCarthy, Inc. 2001. Alternative Corrective Measures Evaluation Report, Duwamish Sediment Other Area, Preferred Remedy Interim Measure. Prepared for The Boeing Company, Seattle, Washington.
Windward and QEA (Windward Environmental, LLC, and Quantitative Environmental Analysis, LLC). 2008. Lower Duwamish Waterway, Final Sediment Transport Analysis Report. Prepared for The Lower Duwamish Waterway Group. Windward, Seattle, Washington, and QEA, Montvale, New Jersey.
Figures
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NORTH AREA HABITATRESTORATION
SOUTH AREA HABITATRESTORATION
RS-140
0
RS-180
0
RS-460
0
RS-500
0
RS-0RS-2
00RS-4
00RS-6
00RS-8
00RS-1
000
RS-120
0
RS-160
0
RS-200
0RS-2
200
RS-240
0RS-2
600
RS-280
0RS-3
000
RS-320
0RS-3
400
RS-360
0RS-3
800
RS-400
0RS-4
200
RS-440
0
RS-480
0
RS-5451
RS-5651
RS-520
0
APPROXIMATE SCALE IN FEET
2250 450
SYM REVISION APPROVEDBY DATE
APPROVED BY
SPECIFICATION IS APPROVEDTHIS DESIGN AND/ORACCEPTABILITY
DATEDEPT.
DATE
CHECKED
APPROVED
CHECKED
ENGINEER
DRAWN
TITLE
SUBTITLE
DWG NO.
JOB NO.
CURRENT REVISION
SHEET
SYMBOL DATESYM REVISION APPROVEDBY DATE
COMP NO.
APPROVED(DISCIPLINE) MASTER COL.
FINAL GRADING SURFACE ANDMODELING CROSS SECTIONS
8/1/11
Geomorphic Cross Sections C3D.dwg
0148440050
SITE
1
23 ft
20 ft
15 ft
10 ft
5 ft
0 ft
-5 ft
-10 ft
-15 ft
-20 ft
-22 ft
Ele
vatio
n M
LLW
ft
08/31/11
FIGURE 2
Velocity and Water Surface Elevation for 14400 cfs Flow and Spring Tides Unsteady HEC-RAS Scenario at RS 1200
Geomorphic Investigation for Boeing Plant 2 Habitat Restoration
Seattle, WA for The Boeing Company
08/31/11
Source: Confluence, 2011
FIGURE 3
Project Graded Area Exposed to Increase in Shear Stress at RS 1400
Geomorphic Investigation for Boeing Plant 2 Habitat Restoration Seattle, WA
for The Boeing Company
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Appendix A
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Table A‐1. HEC‐RAS steady and unsteady model scenarios for existing and project conditions (Boeing Plant 2 habitat restoration)
Model ScenarioProject (.prj)
Plan (.p)Geometry
(.g)Steady Flow (.f)
Unsteady Flow (.u)
Flow at RS 5651(cfs)
Stage @RS 0 Computation
Interval Velocity Output
Existing: Steady (4 ft)Duwamish‐Existing‐Steady_4ft
Existing‐Steady_4ft
n/a1340; 8400; 12000; 14400
n/a n/aExisting.r0
8
Existing: Steady (8 ft)Duwamish‐Existing‐Steady_8ft
Existing‐Steady_8ft
n/a1340; 8400; 12000; 14400
n/a n/aExisting.r0
9
Existing: Steady (12 ft)Duwamish‐Existing‐Steady_12ft
Existing‐Steady_12ft
n/a1340; 8400; 12000; 14400
n/a n/aExisting.r1
0Existing: Spring Tides&Mean Flow
Duwamish‐Existing‐Mean‐Spring
n/aExist‐Daily Spring
1340 30 min tides 30 minExisting.hyd03
Existing: Spring Tides&2‐Yr Flow
Duwamish‐Existing‐2‐Yr‐Spring
n/aExist‐2yr‐Spring
8400 30 min tides 30 minExisting.hyd04
Existing: Spring Tides&100‐Yr Flow
Duwamish‐Existing‐100‐Yr‐Spring
n/aExist‐100yr‐Spring
12000 30 min tides 30 minExisting.hyd01
Existing: Spring Tides&14400 cfs
Duwamish‐Existing‐100‐Yr+20percentSpring
n/aExist‐100yr+20per
14400 30 min tides 30 minExisting.hyd11
Existing: Neap Tides&Mean Flow
Duwamish‐Existing‐Mean‐Neap
n/aExist‐Daily Neap
1340 30 min tides 30 minExisting.hyd05
Existing: Neap Tides&2‐Yr Flow
Duwamish‐Existing‐2‐Yr‐Spring
n/aExist‐2yr‐Neap
8400 30 min tides 30 minExisting.hyd06
Existing: Neap Tides&100‐Yr Flow
Duwamish‐Existing‐100‐Yr‐Spring
n/aExist‐100yr‐Neap
12000 30 min tides 30 minExisting.hyd07
Existing: Neap Tides& 14400 cfs Flow
Duwamish‐Existing‐100‐yr+20percentSpring
n/aExist‐100yr+20percent‐Neap
14400 30 min tides 30 min Existing.hyd02
Project: Steady (4 ft) Duwamish‐Project‐SteadyExisting‐Steady_4ft
n/a1340; 8400;
12000n/a n/a
Existing.r08
Project: Steady (8 ft) Duwamish‐Project‐SteadyExisting‐Steady_8ft
n/a1340; 8400;
12000n/a n/a
Existing.r09
Project: Steady (12 ft) Duwamish‐Project‐SteadyExisting‐Steady_12ft
n/a1340; 8400;
12000n/a n/a
Existing.r10
Project: Spring Tides&Mean Flow
Duwamish‐Project‐Mean‐Spring
n/aEx‐Daily‐Spring
1340 30 min tides 30 minPlant2.hyd03
Project: Spring Tides&2‐Yr Flow
Duwamish‐Project‐2‐Yr‐Spring
n/aExist‐2yr‐Spring
8400 30 min tides 30 minPlant2.hyd01
Project: Spring Tides&100‐Yr Flow
Duwamish‐Project‐100‐Yr‐Spring
n/aExist‐100yr‐Spring
12000 30 min tides 30 minPlant2.hyd04
Project: Spring Tides&14400 cfs
Duwamish‐Project‐‐100 yr+20percentSpring
n/aExist‐100yr+20per
14400 30 min tides 30 minPlant2.hyd02
Project: Neap Tides&Mean Flow
Duwamish‐Project‐Mean‐Neap
n/aExist‐Daily Neap
1340 30 min tides 30 minPlant2.hyd05
Project: Neap Tides&2‐Yr Flow
Duwamish‐Project‐2‐Yr‐Neap
n/aExist‐2yr‐Neap
8400 30 min tides 30 minPlant2.hyd06
Project: Neap Tides&100‐Yr Flow
Duwamish‐Project‐100‐Yr‐Neap
n/aExist‐100yr‐Neap
12000 30 min tides 30 minPlant2.hyd06
Project: Neap Tides&14400 cfs Flow
Duwamish‐Project‐100‐Yr+20percentNeap
n/aExist‐100yr+20per
14400 30 min tides 30 minPlant2.hyd11
Duwamish‐Existing
Duwamish Plant 2
Duwamish‐Existing_Revised
Duwamish _Plant 2_Revised
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Appendix B
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HEC-RAS Plan: Project_4ft River: Duwamish Reach: UpperReach River Sta Profile Q Total Min Ch El W.S. Elev Max Chl Dpth Vel Chnl Shear Chan Flow Area Top Width Hydr Depth C W.P. Channel Hydr Radius C E.G. Slope
(cfs) (ft) (ft) (ft) (ft/s) (lb/sq ft) (sq ft) (ft) (ft) (ft) (ft) (ft/ft)Upper 5651 Mean 1340.00 -15.00 4.00 19.00 0.29 0.00 4691.93 345.08 13.60 348.81 13.45 0.000001Upper 5651 2-Yr 8400.00 -15.00 4.12 19.12 1.77 0.02 4732.93 345.90 13.68 349.66 13.54 0.000028Upper 5651 100-Yr 12000.00 -15.00 4.25 19.25 2.51 0.05 4776.08 346.77 13.77 350.57 13.62 0.000055Upper 5651 100-Yr+20% 14400.00 -15.00 4.35 19.35 2.99 0.07 4812.75 347.51 13.85 351.34 13.70 0.000077
Upper 5451 Mean 1340.00 -15.10 4.00 19.10 0.27 0.00 4930.22 370.55 13.31 374.09 13.18 0.000001Upper 5451 2-Yr 8400.00 -15.10 4.12 19.22 1.69 0.02 4973.46 371.09 13.40 374.68 13.27 0.000026Upper 5451 100-Yr 12000.00 -15.10 4.24 19.34 2.39 0.04 5019.00 371.66 13.50 375.30 13.37 0.000051Upper 5451 100-Yr+20% 14400.00 -15.10 4.35 19.45 2.85 0.06 5057.68 372.14 13.59 375.83 13.46 0.000072
Upper 5200 Mean 1340.00 -16.60 4.00 20.60 0.25 0.00 5381.37 394.09 13.66 397.42 13.54 0.000001Upper 5200 2-Yr 8400.00 -16.60 4.12 20.72 1.55 0.02 5427.04 394.66 13.75 398.03 13.63 0.000021Upper 5200 100-Yr 12000.00 -16.60 4.24 20.84 2.19 0.04 5475.17 395.25 13.85 398.67 13.73 0.000041Upper 5200 100-Yr+20% 14400.00 -16.60 4.34 20.94 2.61 0.05 5516.10 395.76 13.94 399.21 13.82 0.000058
Upper 5000 Mean 1340.00 -18.90 4.00 22.90 0.28 0.00 4722.81 332.30 14.21 336.92 14.02 0.000001Upper 5000 2-Yr 8400.00 -18.90 4.10 23.00 1.77 0.02 4755.81 332.93 14.28 337.59 14.09 0.000026Upper 5000 100-Yr 12000.00 -18.90 4.21 23.11 2.50 0.05 4790.64 333.59 14.36 338.29 14.16 0.000052Upper 5000 100-Yr+20% 14400.00 -18.90 4.30 23.20 2.99 0.07 4820.27 334.10 14.43 338.84 14.23 0.000073
Upper 4800 Mean 1340.00 -18.70 4.00 22.70 0.26 0.00 5165.03 338.98 15.24 344.33 15.00 0.000001Upper 4800 2-Yr 8400.00 -18.70 4.10 22.80 1.62 0.02 5199.02 339.58 15.31 344.97 15.07 0.000020Upper 4800 100-Yr 12000.00 -18.70 4.21 22.91 2.29 0.04 5234.87 340.21 15.39 345.65 15.15 0.000040Upper 4800 100-Yr+20% 14400.00 -18.70 4.30 23.00 2.73 0.05 5265.40 340.74 15.45 346.22 15.21 0.000056
Upper 4600 Mean 1340.00 -18.30 4.00 22.30 0.21 0.00 6244.00 490.36 12.73 495.30 12.61 0.000000Upper 4600 2-Yr 8400.00 -18.30 4.11 22.41 1.33 0.01 6295.74 491.21 12.82 496.18 12.69 0.000017Upper 4600 100-Yr 12000.00 -18.30 4.22 22.52 1.89 0.03 6350.35 492.10 12.90 497.11 12.77 0.000034Upper 4600 100-Yr+20% 14400.00 -18.30 4.31 22.61 2.25 0.04 6396.90 492.86 12.98 497.90 12.85 0.000048
Upper 4400 Mean 1340.00 -18.20 4.00 22.20 0.22 0.00 6024.20 493.04 12.22 497.42 12.11 0.000001Upper 4400 2-Yr 8400.00 -18.20 4.10 22.30 1.38 0.01 6073.40 494.05 12.29 498.45 12.18 0.000019Upper 4400 100-Yr 12000.00 -18.20 4.21 22.41 1.96 0.03 6125.44 495.07 12.37 499.49 12.26 0.000038Upper 4400 100-Yr+20% 14400.00 -18.20 4.30 22.50 2.33 0.04 6169.88 495.94 12.44 500.37 12.33 0.000054
Upper 4200 Mean 1340.00 -19.80 4.00 23.80 0.21 0.00 6357.43 494.45 12.86 498.50 12.75 0.000000Upper 4200 2-Yr 8400.00 -19.80 4.10 23.90 1.31 0.01 6406.09 495.50 12.93 499.57 12.82 0.000016Upper 4200 100-Yr 12000.00 -19.80 4.20 24.00 1.86 0.03 6457.58 496.61 13.00 500.70 12.90 0.000032Upper 4200 100-Yr+20% 14400.00 -19.80 4.29 24.09 2.21 0.04 6501.59 497.55 13.07 501.66 12.96 0.000046
Upper 4000 Mean 1340.00 -20.10 4.00 24.10 0.21 0.00 6418.01 498.16 12.88 501.71 12.79 0.000000Upper 4000 2-Yr 8400.00 -20.10 4.10 24.20 1.30 0.01 6465.62 498.90 12.96 502.47 12.87 0.000016Upper 4000 100-Yr 12000.00 -20.10 4.20 24.30 1.84 0.03 6516.02 499.68 13.04 503.28 12.95 0.000032Upper 4000 100-Yr+20% 14400.00 -20.10 4.29 24.39 2.20 0.04 6559.11 500.34 13.11 503.96 13.02 0.000045
Upper 3800 Mean 1340.00 -21.80 4.00 25.80 0.22 0.00 5970.45 454.36 13.14 461.30 12.94 0.000000Upper 3800 2-Yr 8400.00 -21.80 4.09 25.89 1.40 0.01 6010.38 455.25 13.20 462.22 13.00 0.000018Upper 3800 100-Yr 12000.00 -21.80 4.18 25.98 1.98 0.03 6052.72 456.20 13.27 463.18 13.07 0.000036Upper 3800 100-Yr+20% 14400.00 -21.80 4.26 26.06 2.36 0.04 6088.96 457.01 13.32 464.01 13.12 0.000051
Upper 3600 Mean 1340.00 -20.40 4.00 24.40 0.23 0.00 5875.56 450.71 13.04 456.25 12.88 0.000000Upper 3600 2-Yr 8400.00 -20.40 4.09 24.49 1.42 0.02 5913.08 451.89 13.09 457.43 12.93 0.000019Upper 3600 100-Yr 12000.00 -20.40 4.17 24.57 2.02 0.03 5952.93 453.14 13.14 458.69 12.98 0.000038Upper 3600 100-Yr+20% 14400.00 -20.40 4.25 24.65 2.41 0.04 5987.08 454.20 13.18 459.77 13.02 0.000053
Upper 3400 Mean 1340.00 -19.20 4.00 23.20 0.26 0.00 5097.47 407.82 12.50 411.92 12.37 0.000001Upper 3400 2-Yr 8400.00 -19.20 4.07 23.27 1.64 0.02 5125.12 409.16 12.53 413.27 12.40 0.000026Upper 3400 100-Yr 12000.00 -19.20 4.14 23.34 2.33 0.04 5154.57 410.10 12.57 414.22 12.44 0.000053Upper 3400 100-Yr+20% 14400.00 -19.20 4.20 23.40 2.78 0.06 5179.86 410.87 12.61 415.01 12.48 0.000076
Upper 3200 Mean 1340.00 -19.00 4.00 23.00 0.26 0.00 5120.25 417.00 12.28 420.68 12.17 0.000001Upper 3200 2-Yr 8400.00 -19.00 4.06 23.06 1.63 0.02 5146.43 417.65 12.32 421.35 12.21 0.000027Upper 3200 100-Yr 12000.00 -19.00 4.13 23.13 2.32 0.04 5174.32 418.35 12.37 422.06 12.26 0.000054Upper 3200 100-Yr+20% 14400.00 -19.00 4.19 23.19 2.77 0.06 5198.29 418.95 12.41 422.68 12.30 0.000077
Upper 3000 Mean 1340.00 -19.00 4.00 23.00 0.26 0.00 5182.04 435.57 11.90 440.33 11.77 0.000001Upper 3000 2-Yr 8400.00 -19.00 4.06 23.06 1.61 0.02 5207.37 436.30 11.94 441.10 11.81 0.000027Upper 3000 100-Yr 12000.00 -19.00 4.12 23.12 2.29 0.04 5234.40 437.07 11.98 441.92 11.84 0.000055Upper 3000 100-Yr+20% 14400.00 -19.00 4.17 23.17 2.74 0.06 5257.67 437.73 12.01 442.62 11.88 0.000078
Upper 2800 Mean 1340.00 -18.60 4.00 22.60 0.25 0.00 5313.76 466.88 11.38 470.42 11.30 0.000001Upper 2800 2-Yr 8400.00 -18.60 4.06 22.66 1.57 0.02 5339.04 467.74 11.41 471.30 11.33 0.000028Upper 2800 100-Yr 12000.00 -18.60 4.11 22.71 2.24 0.04 5366.07 468.66 11.45 472.25 11.36 0.000055Upper 2800 100-Yr+20% 14400.00 -18.60 4.16 22.76 2.67 0.06 5389.36 469.45 11.48 473.07 11.39 0.000079
Upper 2600 Mean 1340.00 -18.20 4.00 22.20 0.25 0.00 5329.42 458.28 11.63 461.60 11.55 0.000001Upper 2600 2-Yr 8400.00 -18.20 4.05 22.25 1.57 0.02 5351.86 458.97 11.66 462.29 11.58 0.000027Upper 2600 100-Yr 12000.00 -18.20 4.10 22.30 2.23 0.04 5375.88 459.50 11.70 462.84 11.62 0.000054Upper 2600 100-Yr+20% 14400.00 -18.20 4.15 22.35 2.67 0.06 5396.60 459.96 11.73 463.30 11.65 0.000076
Upper 2400 Mean 1340.00 -18.30 4.00 22.30 0.25 0.00 5300.17 463.57 11.43 466.80 11.35 0.000001Upper 2400 2-Yr 8400.00 -18.30 4.04 22.34 1.58 0.02 5320.19 463.81 11.47 467.06 11.39 0.000028Upper 2400 100-Yr 12000.00 -18.30 4.09 22.39 2.25 0.04 5341.63 464.06 11.51 467.33 11.43 0.000055Upper 2400 100-Yr+20% 14400.00 -18.30 4.13 22.43 2.69 0.06 5360.13 464.28 11.55 467.56 11.46 0.000079
Upper 2200 Mean 1340.00 -18.10 4.00 22.10 0.25 0.00 5431.42 475.59 11.42 478.46 11.35 0.000001Upper 2200 2-Yr 8400.00 -18.10 4.04 22.14 1.54 0.02 5450.06 476.13 11.45 479.01 11.38 0.000026Upper 2200 100-Yr 12000.00 -18.10 4.08 22.18 2.19 0.04 5470.07 476.71 11.47 479.59 11.41 0.000053Upper 2200 100-Yr+20% 14400.00 -18.10 4.12 22.22 2.62 0.05 5487.38 477.21 11.50 480.10 11.43 0.000076
Upper 2000 Mean 1340.00 -18.39 4.00 22.39 0.26 0.00 5177.84 404.77 12.79 408.74 12.67 0.000001Upper 2000 2-Yr 8400.00 -18.39 4.03 22.42 1.62 0.02 5190.03 405.11 12.81 409.08 12.69 0.000025Upper 2000 100-Yr 12000.00 -18.39 4.06 22.45 2.31 0.04 5203.11 405.47 12.83 409.45 12.71 0.000051Upper 2000 100-Yr+20% 14400.00 -18.39 4.09 22.48 2.76 0.06 5214.40 405.78 12.85 409.76 12.73 0.000073
Upper 1800 Mean 1340.00 -18.30 4.00 22.30 0.25 0.00 5345.31 399.50 13.38 403.06 13.26 0.000001Upper 1800 2-Yr 8400.00 -18.30 4.03 22.33 1.57 0.02 5356.19 399.77 13.40 403.34 13.28 0.000022Upper 1800 100-Yr 12000.00 -18.30 4.06 22.36 2.24 0.04 5367.85 400.06 13.42 403.64 13.30 0.000045Upper 1800 100-Yr+20% 14400.00 -18.30 4.08 22.38 2.68 0.05 5377.93 400.32 13.43 403.90 13.32 0.000064
Upper 1600 Mean 1340.00 -18.00 4.00 22.00 0.23 0.00 5860.69 391.19 14.98 395.12 14.83 0.000000
HEC-RAS Plan: Project_4ft River: Duwamish Reach: Upper (Continued)Reach River Sta Profile Q Total Min Ch El W.S. Elev Max Chl Dpth Vel Chnl Shear Chan Flow Area Top Width Hydr Depth C W.P. Channel Hydr Radius C E.G. Slope
(cfs) (ft) (ft) (ft) (ft/s) (lb/sq ft) (sq ft) (ft) (ft) (ft) (ft) (ft/ft)Upper 1600 2-Yr 8400.00 -18.00 4.03 22.03 1.43 0.01 5871.63 391.35 15.00 395.28 14.85 0.000016Upper 1600 100-Yr 12000.00 -18.00 4.06 22.06 2.04 0.03 5883.34 391.51 15.03 395.46 14.88 0.000032Upper 1600 100-Yr+20% 14400.00 -18.00 4.08 22.08 2.44 0.04 5893.47 391.66 15.05 395.62 14.90 0.000046
Upper 1400 Mean 1340.00 -18.20 4.00 22.20 0.21 0.00 6238.23 399.77 15.60 404.99 15.40 0.000000Upper 1400 2-Yr 8400.00 -18.20 4.03 22.23 1.34 0.01 6249.29 399.94 15.63 405.16 15.42 0.000013Upper 1400 100-Yr 12000.00 -18.20 4.06 22.26 1.92 0.03 6261.14 400.12 15.65 405.35 15.45 0.000027Upper 1400 100-Yr+20% 14400.00 -18.20 4.08 22.28 2.30 0.04 6271.40 400.27 15.67 405.52 15.47 0.000039
Upper 1200 Mean 1340.00 -19.50 4.00 23.50 0.13 0.00 10650.02 544.33 19.57 567.97 18.75 0.000000Upper 1200 2-Yr 8400.00 -19.50 4.04 23.54 0.79 0.00 10671.28 544.42 19.60 568.10 18.78 0.000004Upper 1200 100-Yr 12000.00 -19.50 4.08 23.58 1.12 0.01 10693.98 544.51 19.64 568.25 18.82 0.000007Upper 1200 100-Yr+20% 14400.00 -19.50 4.12 23.62 1.34 0.01 10713.58 544.60 19.67 568.37 18.85 0.000010
Upper 1000 Mean 1340.00 -20.00 4.00 24.00 0.15 0.00 8942.02 524.49 17.05 528.95 16.91 0.000000Upper 1000 2-Yr 8400.00 -20.00 4.03 24.03 0.94 0.01 8959.79 524.77 17.07 529.23 16.93 0.000006Upper 1000 100-Yr 12000.00 -20.00 4.07 24.07 1.34 0.01 8978.80 525.06 17.10 529.53 16.96 0.000012Upper 1000 100-Yr+20% 14400.00 -20.00 4.10 24.10 1.60 0.02 8995.23 525.31 17.12 529.80 16.98 0.000017
Upper 800 Mean 1340.00 -20.00 4.00 24.00 0.22 0.00 5999.58 422.17 14.21 425.87 14.09 0.000000Upper 800 2-Yr 8400.00 -20.00 4.01 24.01 1.40 0.01 6005.56 422.39 14.22 426.10 14.09 0.000016Upper 800 100-Yr 12000.00 -20.00 4.03 24.03 2.00 0.03 6011.99 422.64 14.22 426.34 14.10 0.000033Upper 800 100-Yr+20% 14400.00 -20.00 4.04 24.04 2.39 0.04 6017.57 422.85 14.23 426.55 14.11 0.000048
Upper 600 Mean 1340.00 -19.15 4.00 23.15 0.19 0.00 7174.82 501.64 14.30 507.12 14.15 0.000000Upper 600 2-Yr 8400.00 -19.15 4.02 23.17 1.17 0.01 7183.74 501.70 14.32 507.19 14.16 0.000011Upper 600 100-Yr 12000.00 -19.15 4.04 23.19 1.67 0.02 7193.32 501.75 14.34 507.26 14.18 0.000023Upper 600 100-Yr+20% 14400.00 -19.15 4.05 23.20 2.00 0.03 7201.61 501.80 14.35 507.32 14.20 0.000033
Upper 400 Mean 1340.00 -19.00 4.00 23.00 0.20 0.00 6675.69 454.06 14.70 458.49 14.56 0.000000Upper 400 2-Yr 8400.00 -19.00 4.01 23.01 1.26 0.01 6681.10 454.12 14.71 458.55 14.57 0.000013Upper 400 100-Yr 12000.00 -19.00 4.03 23.03 1.79 0.02 6686.92 454.18 14.72 458.62 14.58 0.000026Upper 400 100-Yr+20% 14400.00 -19.00 4.04 23.04 2.15 0.03 6691.96 454.23 14.73 458.67 14.59 0.000037
Upper 200 Mean 1340.00 -19.00 4.00 23.00 0.22 0.00 6022.15 413.86 14.55 418.03 14.41 0.000000Upper 200 2-Yr 8400.00 -19.00 4.00 23.00 1.39 0.01 6023.44 413.88 14.55 418.05 14.41 0.000016Upper 200 100-Yr 12000.00 -19.00 4.01 23.01 1.99 0.03 6024.84 413.90 14.56 418.08 14.41 0.000032Upper 200 100-Yr+20% 14400.00 -19.00 4.01 23.01 2.39 0.04 6026.06 413.92 14.56 418.10 14.41 0.000046
Upper 0 Mean 1340.00 -19.10 4.00 23.10 0.22 0.00 6019.96 421.32 14.29 425.05 14.16 0.000000Upper 0 2-Yr 8400.00 -19.10 4.00 23.10 1.40 0.01 6019.96 421.32 14.29 425.05 14.16 0.000016Upper 0 100-Yr 12000.00 -19.10 4.00 23.10 1.99 0.03 6019.96 421.32 14.29 425.05 14.16 0.000033Upper 0 100-Yr+20% 14400.00 -19.10 4.00 23.10 2.39 0.04 6019.96 421.32 14.29 425.05 14.16 0.000047
0 1000 2000 3000 4000 5000 6000-25
-20
-15
-10
-5
0
5
Duwamish Plant 2 Plan: Duwamish-Project-Steady_4ft 8/25/2011
Channel Distance (ft)
Ele
vatio
n (f
t)
Legend
EG 100-Yr+20%
EG 100-Yr
EG 2-Yr
EG Mean
WS 100-Yr
WS 2-Yr
WS 100-Yr+20%
WS Mean
Crit 100-Yr+20%
Crit 100-Yr
Crit 2-Yr
Crit Mean
Ground
Duwamish Upper
0 200 400 600 800-15
-10
-5
0
5
10
15
20
Duwamish Plant 2 Plan: Duwamish-Project-Steady_4ft 8/25/2011 RS = 5651
Station (ft)
Ele
vatio
n (ft
)
Legend
EG 100-Yr+20%
WS 100-Yr+20%
0 ft/s
1 ft/s
2 ft/s
3 ft/s
4 ft/s
Ground
Bank Sta
.05 .025 .05
0 200 400 600 800-20
-15
-10
-5
0
5
10
15
20
Duwamish Plant 2 Plan: Duwamish-Project-Steady_4ft 8/25/2011 RS = 5451
Station (ft)
Ele
vatio
n (ft
)
Legend
EG 100-Yr+20%
WS 100-Yr+20%
0.0 ft/s
0.5 ft/s
1.0 ft/s
1.5 ft/s
2.0 ft/s
2.5 ft/s
3.0 ft/s
3.5 ft/s
Ground
Bank Sta
.05 .025 .05
0 200 400 600 800-20
-15
-10
-5
0
5
10
15
20
Duwamish Plant 2 Plan: Duwamish-Project-Steady_4ft 8/25/2011 RS = 5200
Station (ft)
Ele
vatio
n (ft
)
Legend
EG 100-Yr+20%
WS 100-Yr+20%
0.5 ft/s
1.0 ft/s
1.5 ft/s
2.0 ft/s
2.5 ft/s
3.0 ft/s
3.5 ft/s
Ground
Bank Sta
.05 .025 .05
0 200 400 600 800-20
-10
0
10
20
Duwamish Plant 2 Plan: Duwamish-Project-Steady_4ft 8/25/2011 RS = 5000
Station (ft)
Ele
vatio
n (ft
)
Legend
EG 100-Yr+20%
WS 100-Yr+20%
0 ft/s
1 ft/s
2 ft/s
3 ft/s
4 ft/s
Ground
Bank Sta
.05 .025 .05
0 200 400 600 800-20
-10
0
10
20
Duwamish Plant 2 Plan: Duwamish-Project-Steady_4ft 8/25/2011 RS = 4800
Station (ft)
Ele
vatio
n (ft
)
Legend
EG 100-Yr+20%
WS 100-Yr+20%
0 ft/s
1 ft/s
2 ft/s
3 ft/s
4 ft/s
Ground
Bank Sta
.05 .025 .05
0 200 400 600 800-20
-15
-10
-5
0
5
10
15
20
Duwamish Plant 2 Plan: Duwamish-Project-Steady_4ft 8/25/2011 RS = 4600
Station (ft)
Ele
vatio
n (ft
)
Legend
EG 100-Yr+20%
WS 100-Yr+20%
0.0 ft/s
0.5 ft/s
1.0 ft/s
1.5 ft/s
2.0 ft/s
2.5 ft/s
3.0 ft/s
Ground
Bank Sta
.05 .025 .05
0 200 400 600 800-20
-15
-10
-5
0
5
10
15
20
Duwamish Plant 2 Plan: Duwamish-Project-Steady_4ft 8/25/2011 RS = 4400
Station (ft)
Ele
vatio
n (ft
)
Legend
EG 100-Yr+20%
WS 100-Yr+20%
0.0 ft/s
0.5 ft/s
1.0 ft/s
1.5 ft/s
2.0 ft/s
2.5 ft/s
3.0 ft/s
Ground
Bank Sta
.05 .025 .05
0 200 400 600 800-20
-10
0
10
20
Duwamish Plant 2 Plan: Duwamish-Project-Steady_4ft 8/25/2011 RS = 4200
Station (ft)
Ele
vatio
n (ft
)
Legend
EG 100-Yr+20%
WS 100-Yr+20%
0.0 ft/s
0.5 ft/s
1.0 ft/s
1.5 ft/s
2.0 ft/s
2.5 ft/s
3.0 ft/s
Ground
Bank Sta
.05 .025 .05
0 200 400 600 800-30
-20
-10
0
10
20
Duwamish Plant 2 Plan: Duwamish-Project-Steady_4ft 8/25/2011 RS = 4000
Station (ft)
Ele
vatio
n (ft
)
Legend
EG 100-Yr+20%
WS 100-Yr+20%
0.0 ft/s
0.5 ft/s
1.0 ft/s
1.5 ft/s
2.0 ft/s
2.5 ft/s
3.0 ft/s
Ground
Bank Sta
.05 .025 .05
0 200 400 600 800-30
-20
-10
0
10
20
Duwamish Plant 2 Plan: Duwamish-Project-Steady_4ft 8/25/2011 RS = 3800
Station (ft)
Ele
vatio
n (ft
)
Legend
EG 100-Yr+20%
WS 100-Yr+20%
0.0 ft/s
0.5 ft/s
1.0 ft/s
1.5 ft/s
2.0 ft/s
2.5 ft/s
3.0 ft/s
3.5 ft/s
Ground
Bank Sta
.05 .025 .05
0 200 400 600 800-30
-20
-10
0
10
20
Duwamish Plant 2 Plan: Duwamish-Project-Steady_4ft 8/25/2011 RS = 3600
Station (ft)
Ele
vatio
n (ft
)
Legend
EG 100-Yr+20%
WS 100-Yr+20%
0 ft/s
1 ft/s
2 ft/s
3 ft/s
4 ft/s
Ground
Bank Sta
.05 .025 .05
0 200 400 600 800-20
-10
0
10
20
Duwamish Plant 2 Plan: Duwamish-Project-Steady_4ft 8/25/2011 RS = 3400
Station (ft)
Ele
vatio
n (ft
)
Legend
EG 100-Yr+20%
WS 100-Yr+20%
0 ft/s
1 ft/s
2 ft/s
3 ft/s
4 ft/s
Ground
Bank Sta
.05 .025 .05
0 200 400 600 800-20
-10
0
10
20
Duwamish Plant 2 Plan: Duwamish-Project-Steady_4ft 8/25/2011 RS = 3200
Station (ft)
Ele
vatio
n (ft
)
Legend
EG 100-Yr+20%
WS 100-Yr+20%
0 ft/s
1 ft/s
2 ft/s
3 ft/s
4 ft/s
Ground
Bank Sta
.05 .025 .05
0 200 400 600 800-20
-10
0
10
20
Duwamish Plant 2 Plan: Duwamish-Project-Steady_4ft 8/25/2011 RS = 3000
Station (ft)
Ele
vatio
n (ft
)
Legend
EG 100-Yr+20%
WS 100-Yr+20%
0 ft/s
1 ft/s
2 ft/s
3 ft/s
4 ft/s
Ground
Bank Sta
.05 .025 .05
0 200 400 600 800-20
-10
0
10
20
Duwamish Plant 2 Plan: Duwamish-Project-Steady_4ft 8/25/2011 RS = 2800
Station (ft)
Ele
vatio
n (ft
)
Legend
EG 100-Yr+20%
WS 100-Yr+20%
0 ft/s
1 ft/s
2 ft/s
3 ft/s
4 ft/s
Ground
Bank Sta
.05 .025 .05
0 200 400 600 800-20
-15
-10
-5
0
5
10
15
20
Duwamish Plant 2 Plan: Duwamish-Project-Steady_4ft 8/25/2011 RS = 2600
Station (ft)
Ele
vatio
n (ft
)
Legend
EG 100-Yr+20%
WS 100-Yr+20%
0 ft/s
1 ft/s
2 ft/s
3 ft/s
4 ft/s
Ground
Bank Sta
.05 .025 .05
0 200 400 600 800-20
-15
-10
-5
0
5
10
15
20
Duwamish Plant 2 Plan: Duwamish-Project-Steady_4ft 8/25/2011 RS = 2400
Station (ft)
Ele
vatio
n (ft
)
Legend
EG 100-Yr+20%
WS 100-Yr+20%
0 ft/s
1 ft/s
2 ft/s
3 ft/s
4 ft/s
Ground
Bank Sta
.05 .025 .05
0 200 400 600 800-20
-15
-10
-5
0
5
10
15
20
Duwamish Plant 2 Plan: Duwamish-Project-Steady_4ft 8/25/2011 RS = 2200
Station (ft)
Ele
vatio
n (ft
)
Legend
EG 100-Yr+20%
WS 100-Yr+20%
0 ft/s
1 ft/s
2 ft/s
3 ft/s
4 ft/s
Ground
Bank Sta
.05 .025 .05
0 200 400 600 800-20
-10
0
10
20
30
Duwamish Plant 2 Plan: Duwamish-Project-Steady_4ft 8/25/2011 RS = 2000
Station (ft)
Ele
vatio
n (ft
)
Legend
EG 100-Yr+20%
WS 100-Yr+20%
0 ft/s
1 ft/s
2 ft/s
3 ft/s
4 ft/s
Ground
Bank Sta
.05 .025 .05
0 200 400 600 800-20
-15
-10
-5
0
5
10
15
20
Duwamish Plant 2 Plan: Duwamish-Project-Steady_4ft 8/25/2011 RS = 1800
Station (ft)
Ele
vatio
n (ft
)
Legend
EG 100-Yr+20%
WS 100-Yr+20%
0 ft/s
1 ft/s
2 ft/s
3 ft/s
4 ft/s
Ground
Bank Sta
.05 .025 .05
0 200 400 600 800-20
-15
-10
-5
0
5
10
15
20
Duwamish Plant 2 Plan: Duwamish-Project-Steady_4ft 8/25/2011 RS = 1600
Station (ft)
Ele
vatio
n (ft
)
Legend
EG 100-Yr+20%
WS 100-Yr+20%
0.0 ft/s
0.5 ft/s
1.0 ft/s
1.5 ft/s
2.0 ft/s
2.5 ft/s
3.0 ft/s
Ground
Bank Sta
.05 .025 .05
0 200 400 600 800-20
-10
0
10
20
Duwamish Plant 2 Plan: Duwamish-Project-Steady_4ft 8/25/2011 RS = 1400
Station (ft)
Ele
vatio
n (ft
)
Legend
EG 100-Yr+20%
WS 100-Yr+20%
0.0 ft/s
0.5 ft/s
1.0 ft/s
1.5 ft/s
2.0 ft/s
2.5 ft/s
3.0 ft/s
Ground
Bank Sta
.05 .025 .05
0 200 400 600 800-20
-10
0
10
20
Duwamish Plant 2 Plan: Duwamish-Project-Steady_4ft 8/25/2011 RS = 1200
Station (ft)
Ele
vatio
n (ft
)
Legend
EG 100-Yr+20%
WS 100-Yr+20%
0.0 ft/s
0.2 ft/s
0.4 ft/s
0.6 ft/s
0.8 ft/s
1.0 ft/s
1.2 ft/s
1.4 ft/s
1.6 ft/s
Ground
Bank Sta
.05 .025
0 200 400 600 800-20
-10
0
10
20
Duwamish Plant 2 Plan: Duwamish-Project-Steady_4ft 8/25/2011 RS = 1000
Station (ft)
Ele
vatio
n (ft
)
Legend
EG 100-Yr+20%
WS 100-Yr+20%
0.0 ft/s
0.5 ft/s
1.0 ft/s
1.5 ft/s
2.0 ft/s
Ground
Bank Sta
.05 .025 .05
0 200 400 600 800-20
-10
0
10
20
Duwamish Plant 2 Plan: Duwamish-Project-Steady_4ft 8/25/2011 RS = 800
Station (ft)
Ele
vatio
n (ft
)
Legend
EG 100-Yr+20%
WS 100-Yr+20%
0.0 ft/s
0.5 ft/s
1.0 ft/s
1.5 ft/s
2.0 ft/s
2.5 ft/s
3.0 ft/s
Ground
Bank Sta
.05 .025 .05
0 200 400 600 800-20
-10
0
10
20
Duwamish Plant 2 Plan: Duwamish-Project-Steady_4ft 8/25/2011 RS = 600
Station (ft)
Ele
vatio
n (ft
)
Legend
EG 100-Yr+20%
WS 100-Yr+20%
0.0 ft/s
0.5 ft/s
1.0 ft/s
1.5 ft/s
2.0 ft/s
2.5 ft/s
Ground
Bank Sta
.05 .025 .05
0 200 400 600 800-20
-10
0
10
20
Duwamish Plant 2 Plan: Duwamish-Project-Steady_4ft 8/25/2011 RS = 400
Station (ft)
Ele
vatio
n (ft
)
Legend
EG 100-Yr+20%
WS 100-Yr+20%
0.0 ft/s
0.5 ft/s
1.0 ft/s
1.5 ft/s
2.0 ft/s
2.5 ft/s
3.0 ft/s
Ground
Bank Sta
.05 .025 .05
0 200 400 600 800-20
-10
0
10
20
Duwamish Plant 2 Plan: Duwamish-Project-Steady_4ft 8/25/2011 RS = 200
Station (ft)
Ele
vatio
n (ft
)
Legend
EG 100-Yr+20%
WS 100-Yr+20%
0.0 ft/s
0.5 ft/s
1.0 ft/s
1.5 ft/s
2.0 ft/s
2.5 ft/s
3.0 ft/s
Ground
Bank Sta
.05 .025 .05
0 200 400 600 800-20
-10
0
10
20
Duwamish Plant 2 Plan: Duwamish-Project-Steady_4ft 8/25/2011 RS = 0
Station (ft)
Ele
vatio
n (ft
)
Legend
EG 100-Yr+20%
WS 100-Yr+20%
Crit 100-Yr+20%
0.0 ft/s
0.5 ft/s
1.0 ft/s
1.5 ft/s
2.0 ft/s
2.5 ft/s
3.0 ft/s
Ground
Bank Sta
.05 .025 .05
Appendix C
(this page left blank intentionally)
HEC-RAS Plan: Project_8ft River: Duwamish Reach: UpperReach River Sta Profile Q Total Min Ch El W.S. Elev Max Chl Dpth Vel Chnl Shear Chan Flow Area Top Width Hydr Depth C W.P. Channel Hydr Radius C E.G. Slope
(cfs) (ft) (ft) (ft) (ft/s) (lb/sq ft) (sq ft) (ft) (ft) (ft) (ft) (ft/ft)Upper 5651 Mean 1340.00 -15.00 8.00 23.00 0.22 0.00 6119.55 367.38 16.66 372.67 16.42 0.000000Upper 5651 2-Yr 8400.00 -15.00 8.06 23.06 1.37 0.01 6139.47 367.63 16.70 372.95 16.46 0.000013Upper 5651 100-Yr 12000.00 -15.00 8.11 23.11 1.95 0.03 6160.66 367.89 16.75 373.25 16.51 0.000026Upper 5651 100-Yr+20% 14400.00 -15.00 8.16 23.16 2.33 0.04 6178.85 368.12 16.78 373.50 16.54 0.000036
Upper 5451 Mean 1340.00 -15.10 8.00 23.10 0.21 0.00 6449.34 389.38 16.56 394.56 16.35 0.000000Upper 5451 2-Yr 8400.00 -15.10 8.06 23.16 1.30 0.01 6470.31 389.63 16.61 394.84 16.39 0.000011Upper 5451 100-Yr 12000.00 -15.10 8.11 23.21 1.85 0.02 6492.61 389.90 16.65 395.13 16.43 0.000023Upper 5451 100-Yr+20% 14400.00 -15.10 8.16 23.26 2.21 0.03 6511.78 390.13 16.69 395.39 16.47 0.000033
Upper 5200 Mean 1340.00 -16.60 8.00 24.60 0.19 0.00 6995.38 412.85 16.94 417.81 16.74 0.000000Upper 5200 2-Yr 8400.00 -16.60 8.06 24.66 1.20 0.01 7017.68 413.09 16.99 418.07 16.79 0.000009Upper 5200 100-Yr 12000.00 -16.60 8.11 24.71 1.70 0.02 7041.39 413.34 17.04 418.35 16.83 0.000019Upper 5200 100-Yr+20% 14400.00 -16.60 8.16 24.76 2.04 0.03 7061.77 413.55 17.08 418.59 16.87 0.000027
Upper 5000 Mean 1340.00 -18.90 8.00 26.90 0.22 0.00 6097.43 355.89 17.13 362.06 16.84 0.000000Upper 5000 2-Yr 8400.00 -18.90 8.05 26.95 1.37 0.01 6113.21 356.15 17.16 362.33 16.87 0.000012Upper 5000 100-Yr 12000.00 -18.90 8.09 26.99 1.96 0.03 6129.99 356.43 17.20 362.63 16.90 0.000025Upper 5000 100-Yr+20% 14400.00 -18.90 8.13 27.03 2.34 0.04 6144.43 356.67 17.23 362.88 16.93 0.000036
Upper 4800 Mean 1340.00 -18.70 8.00 26.70 0.20 0.00 6566.50 361.70 18.15 368.78 17.81 0.000000Upper 4800 2-Yr 8400.00 -18.70 8.05 26.75 1.28 0.01 6582.75 361.92 18.19 369.02 17.84 0.000010Upper 4800 100-Yr 12000.00 -18.70 8.09 26.79 1.82 0.02 6600.03 362.15 18.22 369.27 17.87 0.000020Upper 4800 100-Yr+20% 14400.00 -18.70 8.13 26.83 2.18 0.03 6614.88 362.35 18.26 369.50 17.90 0.000029
Upper 4600 Mean 1340.00 -18.30 8.00 26.30 0.16 0.00 8266.03 521.07 15.86 527.46 15.67 0.000000Upper 4600 2-Yr 8400.00 -18.30 8.05 26.35 1.01 0.01 8291.90 521.42 15.90 527.85 15.71 0.000007Upper 4600 100-Yr 12000.00 -18.30 8.10 26.40 1.44 0.01 8319.43 521.79 15.94 528.25 15.75 0.000015Upper 4600 100-Yr+20% 14400.00 -18.30 8.15 26.45 1.73 0.02 8343.08 522.07 15.98 528.57 15.78 0.000021
Upper 4400 Mean 1340.00 -18.20 8.00 26.20 0.17 0.00 8061.09 523.60 15.40 529.63 15.22 0.000000Upper 4400 2-Yr 8400.00 -18.20 8.05 26.25 1.04 0.01 8085.83 523.91 15.43 529.96 15.26 0.000008Upper 4400 100-Yr 12000.00 -18.20 8.10 26.30 1.48 0.02 8112.17 524.23 15.47 530.32 15.30 0.000016Upper 4400 100-Yr+20% 14400.00 -18.20 8.14 26.34 1.77 0.02 8134.82 524.51 15.51 530.63 15.33 0.000023
Upper 4200 Mean 1340.00 -19.80 8.00 27.80 0.16 0.00 8411.13 530.97 15.84 535.98 15.69 0.000000Upper 4200 2-Yr 8400.00 -19.80 8.05 27.85 1.00 0.01 8435.93 531.36 15.88 536.38 15.73 0.000007Upper 4200 100-Yr 12000.00 -19.80 8.10 27.90 1.42 0.01 8462.34 531.78 15.91 536.81 15.76 0.000014Upper 4200 100-Yr+20% 14400.00 -19.80 8.14 27.94 1.70 0.02 8485.06 532.13 15.95 537.18 15.80 0.000021
Upper 4000 Mean 1340.00 -20.10 8.00 28.10 0.16 0.00 8470.08 526.16 16.10 531.43 15.94 0.000000Upper 4000 2-Yr 8400.00 -20.10 8.05 28.15 0.99 0.01 8494.01 526.41 16.14 531.71 15.97 0.000007Upper 4000 100-Yr 12000.00 -20.10 8.10 28.20 1.41 0.01 8519.49 526.68 16.18 532.01 16.01 0.000014Upper 4000 100-Yr+20% 14400.00 -20.10 8.14 28.24 1.69 0.02 8541.43 526.91 16.21 532.27 16.05 0.000020
Upper 3800 Mean 1340.00 -21.80 8.00 29.80 0.17 0.00 7903.88 504.28 15.67 512.56 15.42 0.000000Upper 3800 2-Yr 8400.00 -21.80 8.04 29.84 1.06 0.01 7924.86 504.58 15.71 512.88 15.45 0.000008Upper 3800 100-Yr 12000.00 -21.80 8.09 29.89 1.51 0.02 7947.21 504.89 15.74 513.21 15.49 0.000017Upper 3800 100-Yr+20% 14400.00 -21.80 8.13 29.93 1.81 0.02 7966.46 505.16 15.77 513.49 15.51 0.000024
Upper 3600 Mean 1340.00 -20.40 8.00 28.40 0.17 0.00 7734.80 472.42 16.37 479.84 16.12 0.000000Upper 3600 2-Yr 8400.00 -20.40 8.04 28.44 1.08 0.01 7753.29 472.53 16.41 479.97 16.15 0.000008Upper 3600 100-Yr 12000.00 -20.40 8.08 28.48 1.54 0.02 7773.01 472.65 16.45 480.11 16.19 0.000016Upper 3600 100-Yr+20% 14400.00 -20.40 8.12 28.52 1.85 0.02 7789.98 472.75 16.48 480.24 16.22 0.000024
Upper 3400 Mean 1340.00 -19.20 8.00 27.20 0.20 0.00 6807.58 439.16 15.50 445.01 15.30 0.000000Upper 3400 2-Yr 8400.00 -19.20 8.03 27.23 1.23 0.01 6821.46 439.29 15.53 445.16 15.32 0.000011Upper 3400 100-Yr 12000.00 -19.20 8.07 27.27 1.76 0.02 6836.27 439.43 15.56 445.32 15.35 0.000023Upper 3400 100-Yr+20% 14400.00 -19.20 8.10 27.30 2.10 0.03 6849.02 439.54 15.58 445.45 15.38 0.000033
Upper 3200 Mean 1340.00 -19.00 8.00 27.00 0.19 0.00 6888.05 460.70 14.95 466.16 14.78 0.000000Upper 3200 2-Yr 8400.00 -19.00 8.03 27.03 1.22 0.01 6901.75 460.84 14.98 466.33 14.80 0.000012Upper 3200 100-Yr 12000.00 -19.00 8.06 27.06 1.74 0.02 6916.38 461.00 15.00 466.50 14.83 0.000023Upper 3200 100-Yr+20% 14400.00 -19.00 8.09 27.09 2.08 0.03 6929.00 461.13 15.03 466.66 14.85 0.000033
Upper 3000 Mean 1340.00 -19.00 8.00 27.00 0.19 0.00 7025.54 480.51 14.62 488.49 14.38 0.000000Upper 3000 2-Yr 8400.00 -19.00 8.03 27.03 1.19 0.01 7039.04 480.64 14.65 488.65 14.41 0.000012Upper 3000 100-Yr 12000.00 -19.00 8.06 27.06 1.70 0.02 7053.47 480.78 14.67 488.81 14.43 0.000023Upper 3000 100-Yr+20% 14400.00 -19.00 8.08 27.08 2.04 0.03 7065.92 480.90 14.69 488.96 14.45 0.000033
Upper 2800 Mean 1340.00 -18.60 8.00 26.60 0.18 0.00 7260.78 495.73 14.65 501.81 14.47 0.000000Upper 2800 2-Yr 8400.00 -18.60 8.03 26.63 1.15 0.01 7274.12 495.81 14.67 501.91 14.49 0.000011Upper 2800 100-Yr 12000.00 -18.60 8.06 26.66 1.65 0.02 7288.37 495.90 14.70 502.02 14.52 0.000022Upper 2800 100-Yr+20% 14400.00 -18.60 8.08 26.68 1.97 0.03 7300.67 495.98 14.72 502.12 14.54 0.000031
Upper 2600 Mean 1340.00 -18.20 8.00 26.20 0.19 0.00 7226.28 488.24 14.80 493.87 14.63 0.000000Upper 2600 2-Yr 8400.00 -18.20 8.03 26.23 1.16 0.01 7238.29 488.40 14.82 494.05 14.65 0.000011Upper 2600 100-Yr 12000.00 -18.20 8.05 26.25 1.65 0.02 7251.14 488.57 14.84 494.24 14.67 0.000022Upper 2600 100-Yr+20% 14400.00 -18.20 8.07 26.27 1.98 0.03 7262.23 488.73 14.86 494.41 14.69 0.000031
Upper 2400 Mean 1340.00 -18.30 8.00 26.30 0.19 0.00 7200.56 489.60 14.71 495.26 14.54 0.000000Upper 2400 2-Yr 8400.00 -18.30 8.02 26.32 1.16 0.01 7211.50 489.69 14.73 495.36 14.56 0.000011Upper 2400 100-Yr 12000.00 -18.30 8.05 26.35 1.66 0.02 7223.21 489.78 14.75 495.47 14.58 0.000022Upper 2400 100-Yr+20% 14400.00 -18.30 8.07 26.37 1.99 0.03 7233.31 489.86 14.77 495.57 14.60 0.000031
Upper 2200 Mean 1340.00 -18.10 8.00 26.10 0.18 0.00 7445.96 526.74 14.14 530.38 14.04 0.000000Upper 2200 2-Yr 8400.00 -18.10 8.02 26.12 1.13 0.01 7457.13 526.87 14.15 530.51 14.06 0.000011Upper 2200 100-Yr 12000.00 -18.10 8.04 26.14 1.61 0.02 7469.08 527.00 14.17 530.66 14.08 0.000022Upper 2200 100-Yr+20% 14400.00 -18.10 8.06 26.16 1.93 0.03 7479.41 527.12 14.19 530.78 14.09 0.000031
Upper 2000 Mean 1340.00 -18.39 8.00 26.39 0.19 0.00 6896.28 454.86 15.16 460.12 14.99 0.000000Upper 2000 2-Yr 8400.00 -18.39 8.02 26.41 1.22 0.01 6903.35 454.93 15.17 460.21 15.00 0.000011Upper 2000 100-Yr 12000.00 -18.39 8.03 26.42 1.74 0.02 6910.91 455.01 15.19 460.30 15.01 0.000023Upper 2000 100-Yr+20% 14400.00 -18.39 8.05 26.44 2.08 0.03 6917.45 455.08 15.20 460.37 15.03 0.000033
Upper 1800 Mean 1340.00 -18.30 8.00 26.30 0.19 0.00 7003.33 425.20 16.47 430.56 16.27 0.000000Upper 1800 2-Yr 8400.00 -18.30 8.01 26.31 1.20 0.01 7009.27 425.27 16.48 430.63 16.28 0.000010Upper 1800 100-Yr 12000.00 -18.30 8.03 26.33 1.71 0.02 7015.61 425.34 16.49 430.72 16.29 0.000020Upper 1800 100-Yr+20% 14400.00 -18.30 8.04 26.34 2.05 0.03 7021.10 425.40 16.50 430.79 16.30 0.000029
Upper 1600 Mean 1340.00 -18.00 8.00 26.00 0.18 0.00 7468.94 412.13 18.12 418.13 17.86 0.000000
HEC-RAS Plan: Project_8ft River: Duwamish Reach: Upper (Continued)Reach River Sta Profile Q Total Min Ch El W.S. Elev Max Chl Dpth Vel Chnl Shear Chan Flow Area Top Width Hydr Depth C W.P. Channel Hydr Radius C E.G. Slope
(cfs) (ft) (ft) (ft) (ft/s) (lb/sq ft) (sq ft) (ft) (ft) (ft) (ft) (ft/ft)Upper 1600 2-Yr 8400.00 -18.00 8.01 26.01 1.12 0.01 7474.75 412.19 18.13 418.20 17.87 0.000008Upper 1600 100-Yr 12000.00 -18.00 8.03 26.03 1.60 0.02 7480.96 412.26 18.15 418.28 17.89 0.000016Upper 1600 100-Yr+20% 14400.00 -18.00 8.04 26.04 1.92 0.02 7486.33 412.32 18.16 418.35 17.89 0.000022
Upper 1400 Mean 1340.00 -18.20 8.00 26.20 0.17 0.00 8005.01 484.55 16.52 491.57 16.28 0.000000Upper 1400 2-Yr 8400.00 -18.20 8.01 26.21 1.05 0.01 8011.97 484.83 16.53 491.86 16.29 0.000008Upper 1400 100-Yr 12000.00 -18.20 8.03 26.23 1.50 0.02 8019.41 485.13 16.53 492.17 16.29 0.000015Upper 1400 100-Yr+20% 14400.00 -18.20 8.04 26.24 1.79 0.02 8025.85 485.39 16.53 492.43 16.30 0.000022
Upper 1200 Mean 1340.00 -19.50 8.00 27.50 0.10 0.00 12845.49 553.62 23.20 582.08 22.07 0.000000Upper 1200 2-Yr 8400.00 -19.50 8.02 27.52 0.65 0.00 12857.00 553.67 23.22 582.15 22.09 0.000002Upper 1200 100-Yr 12000.00 -19.50 8.04 27.54 0.93 0.01 12869.30 553.72 23.24 582.23 22.10 0.000004Upper 1200 100-Yr+20% 14400.00 -19.50 8.06 27.56 1.12 0.01 12879.92 553.76 23.26 582.30 22.12 0.000006
Upper 1000 Mean 1340.00 -20.00 8.00 28.00 0.12 0.00 11067.92 537.43 20.59 544.38 20.33 0.000000Upper 1000 2-Yr 8400.00 -20.00 8.02 28.02 0.76 0.00 11077.53 537.48 20.61 544.45 20.35 0.000003Upper 1000 100-Yr 12000.00 -20.00 8.04 28.04 1.08 0.01 11087.80 537.54 20.63 544.52 20.36 0.000006Upper 1000 100-Yr+20% 14400.00 -20.00 8.05 28.05 1.30 0.01 11096.67 537.59 20.64 544.58 20.38 0.000009
Upper 800 Mean 1340.00 -20.00 8.00 28.00 0.17 0.00 7813.38 466.99 16.73 472.58 16.53 0.000000Upper 800 2-Yr 8400.00 -20.00 8.01 28.01 1.07 0.01 7816.81 467.02 16.74 472.62 16.54 0.000008Upper 800 100-Yr 12000.00 -20.00 8.02 28.02 1.53 0.02 7820.48 467.05 16.74 472.65 16.55 0.000016Upper 800 100-Yr+20% 14400.00 -20.00 8.02 28.02 1.84 0.02 7823.66 467.08 16.75 472.69 16.55 0.000023
Upper 600 Mean 1340.00 -19.15 8.00 27.15 0.15 0.00 9203.43 512.19 17.97 520.81 17.67 0.000000Upper 600 2-Yr 8400.00 -19.15 8.01 27.16 0.91 0.01 9208.32 512.21 17.98 520.84 17.68 0.000005Upper 600 100-Yr 12000.00 -19.15 8.02 27.17 1.30 0.01 9213.56 512.24 17.99 520.88 17.69 0.000010Upper 600 100-Yr+20% 14400.00 -19.15 8.03 27.18 1.56 0.02 9218.08 512.26 17.99 520.91 17.70 0.000015
Upper 400 Mean 1340.00 -19.00 8.00 27.00 0.16 0.00 8519.74 467.04 18.24 474.16 17.97 0.000000Upper 400 2-Yr 8400.00 -19.00 8.01 27.01 0.99 0.01 8522.61 467.06 18.25 474.18 17.97 0.000006Upper 400 100-Yr 12000.00 -19.00 8.01 27.01 1.41 0.01 8525.70 467.08 18.25 474.20 17.98 0.000012Upper 400 100-Yr+20% 14400.00 -19.00 8.02 27.02 1.69 0.02 8528.37 467.10 18.26 474.22 17.98 0.000017
Upper 200 Mean 1340.00 -19.00 8.00 27.00 0.17 0.00 7730.28 440.37 17.55 445.86 17.34 0.000000Upper 200 2-Yr 8400.00 -19.00 8.00 27.00 1.09 0.01 7730.90 440.38 17.56 445.87 17.34 0.000007Upper 200 100-Yr 12000.00 -19.00 8.00 27.00 1.55 0.02 7731.56 440.39 17.56 445.88 17.34 0.000015Upper 200 100-Yr+20% 14400.00 -19.00 8.00 27.00 1.86 0.02 7732.14 440.40 17.56 445.89 17.34 0.000022
Upper 0 Mean 1340.00 -19.10 8.00 27.10 0.17 0.00 7742.39 439.44 17.62 444.90 17.40 0.000000Upper 0 2-Yr 8400.00 -19.10 8.00 27.10 1.08 0.01 7742.39 439.44 17.62 444.90 17.40 0.000007Upper 0 100-Yr 12000.00 -19.10 8.00 27.10 1.55 0.02 7742.39 439.44 17.62 444.90 17.40 0.000015Upper 0 100-Yr+20% 14400.00 -19.10 8.00 27.10 1.86 0.02 7742.39 439.44 17.62 444.90 17.40 0.000022
0 1000 2000 3000 4000 5000 6000-25
-20
-15
-10
-5
0
5
10
Duwamish Plant 2 Plan: Duwamish-Project-Steady_8ft 8/25/2011
Channel Distance (ft)
Ele
vatio
n (f
t)
Legend
EG 100-Yr+20%
EG 100-Yr
EG 2-Yr
EG Mean
WS 100-Yr
WS 2-Yr
WS 100-Yr+20%
WS Mean
Crit 100-Yr+20%
Crit 100-Yr
Crit 2-Yr
Crit Mean
Ground
Duwamish Upper
0 200 400 600 800-15
-10
-5
0
5
10
15
20
Duwamish Plant 2 Plan: Duwamish-Project-Steady_8ft 8/25/2011 RS = 5651
Station (ft)
Ele
vatio
n (ft
)
Legend
EG 100-Yr+20%
WS 100-Yr+20%
0.0 ft/s
0.5 ft/s
1.0 ft/s
1.5 ft/s
2.0 ft/s
2.5 ft/s
3.0 ft/s
Ground
Bank Sta
.05 .025 .05
0 200 400 600 800-20
-15
-10
-5
0
5
10
15
20
Duwamish Plant 2 Plan: Duwamish-Project-Steady_8ft 8/25/2011 RS = 5451
Station (ft)
Ele
vatio
n (ft
)
Legend
EG 100-Yr+20%
WS 100-Yr+20%
0.0 ft/s
0.5 ft/s
1.0 ft/s
1.5 ft/s
2.0 ft/s
2.5 ft/s
3.0 ft/s
Ground
Bank Sta
.05 .025 .05
0 200 400 600 800-20
-15
-10
-5
0
5
10
15
20
Duwamish Plant 2 Plan: Duwamish-Project-Steady_8ft 8/25/2011 RS = 5200
Station (ft)
Ele
vatio
n (ft
)
Legend
EG 100-Yr+20%
WS 100-Yr+20%
0.0 ft/s
0.5 ft/s
1.0 ft/s
1.5 ft/s
2.0 ft/s
2.5 ft/s
Ground
Bank Sta
.05 .025 .05
0 200 400 600 800-20
-10
0
10
20
Duwamish Plant 2 Plan: Duwamish-Project-Steady_8ft 8/25/2011 RS = 5000
Station (ft)
Ele
vatio
n (ft
)
Legend
EG 100-Yr+20%
WS 100-Yr+20%
0.0 ft/s
0.5 ft/s
1.0 ft/s
1.5 ft/s
2.0 ft/s
2.5 ft/s
3.0 ft/s
Ground
Bank Sta
.05 .025 .05
0 200 400 600 800-20
-10
0
10
20
Duwamish Plant 2 Plan: Duwamish-Project-Steady_8ft 8/25/2011 RS = 4800
Station (ft)
Ele
vatio
n (ft
)
Legend
EG 100-Yr+20%
WS 100-Yr+20%
0.0 ft/s
0.5 ft/s
1.0 ft/s
1.5 ft/s
2.0 ft/s
2.5 ft/s
3.0 ft/s
Ground
Bank Sta
.05 .025 .05
0 200 400 600 800-20
-15
-10
-5
0
5
10
15
20
Duwamish Plant 2 Plan: Duwamish-Project-Steady_8ft 8/25/2011 RS = 4600
Station (ft)
Ele
vatio
n (ft
)
Legend
EG 100-Yr+20%
WS 100-Yr+20%
0.0 ft/s
0.5 ft/s
1.0 ft/s
1.5 ft/s
2.0 ft/s
2.5 ft/s
Ground
Bank Sta
.05 .025 .05
0 200 400 600 800-20
-15
-10
-5
0
5
10
15
20
Duwamish Plant 2 Plan: Duwamish-Project-Steady_8ft 8/25/2011 RS = 4400
Station (ft)
Ele
vatio
n (ft
)
Legend
EG 100-Yr+20%
WS 100-Yr+20%
0.0 ft/s
0.5 ft/s
1.0 ft/s
1.5 ft/s
2.0 ft/s
2.5 ft/s
Ground
Bank Sta
.05 .025 .05
0 200 400 600 800-20
-10
0
10
20
Duwamish Plant 2 Plan: Duwamish-Project-Steady_8ft 8/25/2011 RS = 4200
Station (ft)
Ele
vatio
n (ft
)
Legend
EG 100-Yr+20%
WS 100-Yr+20%
0.0 ft/s
0.5 ft/s
1.0 ft/s
1.5 ft/s
2.0 ft/s
2.5 ft/s
Ground
Bank Sta
.05 .025 .05
0 200 400 600 800-30
-20
-10
0
10
20
Duwamish Plant 2 Plan: Duwamish-Project-Steady_8ft 8/25/2011 RS = 4000
Station (ft)
Ele
vatio
n (ft
)
Legend
EG 100-Yr+20%
WS 100-Yr+20%
0.0 ft/s
0.5 ft/s
1.0 ft/s
1.5 ft/s
2.0 ft/s
2.5 ft/s
Ground
Bank Sta
.05 .025 .05
0 200 400 600 800-30
-20
-10
0
10
20
Duwamish Plant 2 Plan: Duwamish-Project-Steady_8ft 8/25/2011 RS = 3800
Station (ft)
Ele
vatio
n (ft
)
Legend
EG 100-Yr+20%
WS 100-Yr+20%
0.0 ft/s
0.5 ft/s
1.0 ft/s
1.5 ft/s
2.0 ft/s
2.5 ft/s
Ground
Bank Sta
.05 .025 .05
0 200 400 600 800-30
-20
-10
0
10
20
Duwamish Plant 2 Plan: Duwamish-Project-Steady_8ft 8/25/2011 RS = 3600
Station (ft)
Ele
vatio
n (ft
)
Legend
EG 100-Yr+20%
WS 100-Yr+20%
0.0 ft/s
0.5 ft/s
1.0 ft/s
1.5 ft/s
2.0 ft/s
2.5 ft/s
Ground
Bank Sta
.05 .025 .05
0 200 400 600 800-20
-10
0
10
20
Duwamish Plant 2 Plan: Duwamish-Project-Steady_8ft 8/25/2011 RS = 3400
Station (ft)
Ele
vatio
n (ft
)
Legend
EG 100-Yr+20%
WS 100-Yr+20%
0.0 ft/s
0.5 ft/s
1.0 ft/s
1.5 ft/s
2.0 ft/s
2.5 ft/s
3.0 ft/s
Ground
Bank Sta
.05 .025 .05
0 200 400 600 800-20
-10
0
10
20
Duwamish Plant 2 Plan: Duwamish-Project-Steady_8ft 8/25/2011 RS = 3200
Station (ft)
Ele
vatio
n (ft
)
Legend
EG 100-Yr+20%
WS 100-Yr+20%
0.0 ft/s
0.5 ft/s
1.0 ft/s
1.5 ft/s
2.0 ft/s
2.5 ft/s
3.0 ft/s
Ground
Bank Sta
.05 .025 .05
0 200 400 600 800-20
-10
0
10
20
Duwamish Plant 2 Plan: Duwamish-Project-Steady_8ft 8/25/2011 RS = 3000
Station (ft)
Ele
vatio
n (ft
)
Legend
EG 100-Yr+20%
WS 100-Yr+20%
0.0 ft/s
0.5 ft/s
1.0 ft/s
1.5 ft/s
2.0 ft/s
2.5 ft/s
3.0 ft/s
Ground
Bank Sta
.05 .025 .05
0 200 400 600 800-20
-10
0
10
20
Duwamish Plant 2 Plan: Duwamish-Project-Steady_8ft 8/25/2011 RS = 2800
Station (ft)
Ele
vatio
n (ft
)
Legend
EG 100-Yr+20%
WS 100-Yr+20%
0.0 ft/s
0.5 ft/s
1.0 ft/s
1.5 ft/s
2.0 ft/s
2.5 ft/s
3.0 ft/s
Ground
Bank Sta
.05 .025 .05
0 200 400 600 800-20
-15
-10
-5
0
5
10
15
20
Duwamish Plant 2 Plan: Duwamish-Project-Steady_8ft 8/25/2011 RS = 2600
Station (ft)
Ele
vatio
n (ft
)
Legend
EG 100-Yr+20%
WS 100-Yr+20%
0.0 ft/s
0.5 ft/s
1.0 ft/s
1.5 ft/s
2.0 ft/s
2.5 ft/s
Ground
Bank Sta
.05 .025 .05
0 200 400 600 800-20
-15
-10
-5
0
5
10
15
20
Duwamish Plant 2 Plan: Duwamish-Project-Steady_8ft 8/25/2011 RS = 2400
Station (ft)
Ele
vatio
n (ft
)
Legend
EG 100-Yr+20%
WS 100-Yr+20%
0.0 ft/s
0.5 ft/s
1.0 ft/s
1.5 ft/s
2.0 ft/s
2.5 ft/s
3.0 ft/s
Ground
Bank Sta
.05 .025 .05
0 200 400 600 800-20
-15
-10
-5
0
5
10
15
20
Duwamish Plant 2 Plan: Duwamish-Project-Steady_8ft 8/25/2011 RS = 2200
Station (ft)
Ele
vatio
n (ft
)
Legend
EG 100-Yr+20%
WS 100-Yr+20%
0.0 ft/s
0.5 ft/s
1.0 ft/s
1.5 ft/s
2.0 ft/s
2.5 ft/s
Ground
Bank Sta
.05 .025 .05
0 200 400 600 800-20
-10
0
10
20
30
Duwamish Plant 2 Plan: Duwamish-Project-Steady_8ft 8/25/2011 RS = 2000
Station (ft)
Ele
vatio
n (ft
)
Legend
EG 100-Yr+20%
WS 100-Yr+20%
0.0 ft/s
0.5 ft/s
1.0 ft/s
1.5 ft/s
2.0 ft/s
2.5 ft/s
3.0 ft/s
Ground
Bank Sta
.05 .025 .05
0 200 400 600 800-20
-15
-10
-5
0
5
10
15
20
Duwamish Plant 2 Plan: Duwamish-Project-Steady_8ft 8/25/2011 RS = 1800
Station (ft)
Ele
vatio
n (ft
)
Legend
EG 100-Yr+20%
WS 100-Yr+20%
0.0 ft/s
0.5 ft/s
1.0 ft/s
1.5 ft/s
2.0 ft/s
2.5 ft/s
Ground
Bank Sta
.05 .025 .05
0 200 400 600 800-20
-15
-10
-5
0
5
10
15
20
Duwamish Plant 2 Plan: Duwamish-Project-Steady_8ft 8/25/2011 RS = 1600
Station (ft)
Ele
vatio
n (ft
)
Legend
EG 100-Yr+20%
WS 100-Yr+20%
0.0 ft/s
0.5 ft/s
1.0 ft/s
1.5 ft/s
2.0 ft/s
2.5 ft/s
Ground
Bank Sta
.05 .025 .05
0 200 400 600 800-20
-10
0
10
20
Duwamish Plant 2 Plan: Duwamish-Project-Steady_8ft 8/25/2011 RS = 1400
Station (ft)
Ele
vatio
n (ft
)
Legend
EG 100-Yr+20%
WS 100-Yr+20%
0.0 ft/s
0.5 ft/s
1.0 ft/s
1.5 ft/s
2.0 ft/s
2.5 ft/s
Ground
Bank Sta
.05 .025 .05
0 200 400 600 800-20
-10
0
10
20
Duwamish Plant 2 Plan: Duwamish-Project-Steady_8ft 8/25/2011 RS = 1200
Station (ft)
Ele
vatio
n (ft
)
Legend
EG 100-Yr+20%
WS 100-Yr+20%
0.2 ft/s
0.4 ft/s
0.6 ft/s
0.8 ft/s
1.0 ft/s
1.2 ft/s
1.4 ft/s
Ground
Bank Sta
.05 .025
0 200 400 600 800-20
-10
0
10
20
Duwamish Plant 2 Plan: Duwamish-Project-Steady_8ft 8/25/2011 RS = 1000
Station (ft)
Ele
vatio
n (ft
)
Legend
EG 100-Yr+20%
WS 100-Yr+20%
0.2 ft/s
0.4 ft/s
0.6 ft/s
0.8 ft/s
1.0 ft/s
1.2 ft/s
1.4 ft/s
1.6 ft/s
Ground
Bank Sta
.05 .025 .05
0 200 400 600 800-20
-10
0
10
20
Duwamish Plant 2 Plan: Duwamish-Project-Steady_8ft 8/25/2011 RS = 800
Station (ft)
Ele
vatio
n (ft
)
Legend
EG 100-Yr+20%
WS 100-Yr+20%
0.0 ft/s
0.5 ft/s
1.0 ft/s
1.5 ft/s
2.0 ft/s
2.5 ft/s
Ground
Bank Sta
.05 .025 .05
0 200 400 600 800-20
-10
0
10
20
Duwamish Plant 2 Plan: Duwamish-Project-Steady_8ft 8/25/2011 RS = 600
Station (ft)
Ele
vatio
n (ft
)
Legend
EG 100-Yr+20%
WS 100-Yr+20%
0.0 ft/s
0.5 ft/s
1.0 ft/s
1.5 ft/s
2.0 ft/s
Ground
Bank Sta
.05 .025 .05
0 200 400 600 800-20
-10
0
10
20
Duwamish Plant 2 Plan: Duwamish-Project-Steady_8ft 8/25/2011 RS = 400
Station (ft)
Ele
vatio
n (ft
)
Legend
EG 100-Yr+20%
WS 100-Yr+20%
0.0 ft/s
0.5 ft/s
1.0 ft/s
1.5 ft/s
2.0 ft/s
2.5 ft/s
Ground
Bank Sta
.05 .025 .05
0 200 400 600 800-20
-10
0
10
20
Duwamish Plant 2 Plan: Duwamish-Project-Steady_8ft 8/25/2011 RS = 200
Station (ft)
Ele
vatio
n (ft
)
Legend
EG 100-Yr+20%
WS 100-Yr+20%
0.0 ft/s
0.5 ft/s
1.0 ft/s
1.5 ft/s
2.0 ft/s
2.5 ft/s
Ground
Bank Sta
.05 .025 .05
0 200 400 600 800-20
-10
0
10
20
Duwamish Plant 2 Plan: Duwamish-Project-Steady_8ft 8/25/2011 RS = 0
Station (ft)
Ele
vatio
n (ft
)
Legend
EG 100-Yr+20%
WS 100-Yr+20%
Crit 100-Yr+20%
0.0 ft/s
0.5 ft/s
1.0 ft/s
1.5 ft/s
2.0 ft/s
2.5 ft/s
Ground
Bank Sta
.05 .025 .05
Appendix D
(this page left blank intentionally)
HEC-RAS Plan: Project_12ft River: Duwamish Reach: UpperReach River Sta Profile Q Total Min Ch El W.S. Elev Max Chl Dpth Vel Chnl Shear Chan Flow Area Top Width Hydr Depth C W.P. Channel Hydr Radius C E.G. Slope
(cfs) (ft) (ft) (ft) (ft/s) (lb/sq ft) (sq ft) (ft) (ft) (ft) (ft) (ft/ft)Upper 5651 Mean 1340.00 -15.00 12.00 27.00 0.18 0.00 7625.21 385.65 19.77 393.04 19.40 0.000000Upper 5651 2-Yr 8400.00 -15.00 12.03 27.03 1.10 0.01 7636.22 385.78 19.79 393.18 19.42 0.000007Upper 5651 100-Yr 12000.00 -15.00 12.06 27.06 1.57 0.02 7647.95 385.93 19.82 393.34 19.44 0.000013Upper 5651 100-Yr+20% 14400.00 -15.00 12.09 27.09 1.88 0.02 7658.07 386.05 19.84 393.48 19.46 0.000019
Upper 5451 Mean 1340.00 -15.10 12.00 27.10 0.17 0.00 8038.24 404.90 19.85 412.15 19.50 0.000000Upper 5451 2-Yr 8400.00 -15.10 12.03 27.13 1.04 0.01 8049.82 405.00 19.88 412.27 19.53 0.000006Upper 5451 100-Yr 12000.00 -15.10 12.06 27.16 1.49 0.01 8062.17 405.11 19.90 412.40 19.55 0.000012Upper 5451 100-Yr+20% 14400.00 -15.10 12.09 27.19 1.78 0.02 8072.82 405.21 19.92 412.51 19.57 0.000017
Upper 5200 Mean 1340.00 -16.60 12.00 28.60 0.15 0.00 8684.12 431.86 20.11 438.45 19.81 0.000000Upper 5200 2-Yr 8400.00 -16.60 12.03 28.63 0.97 0.01 8696.62 432.00 20.13 438.60 19.83 0.000005Upper 5200 100-Yr 12000.00 -16.60 12.06 28.66 1.38 0.01 8709.96 432.15 20.15 438.76 19.85 0.000010Upper 5200 100-Yr+20% 14400.00 -16.60 12.09 28.69 1.65 0.02 8721.46 432.28 20.18 438.91 19.87 0.000014
Upper 5000 Mean 1340.00 -18.90 12.00 30.90 0.18 0.00 7569.74 380.74 19.88 388.34 19.49 0.000000Upper 5000 2-Yr 8400.00 -18.90 12.02 30.92 1.11 0.01 7578.47 380.90 19.90 388.51 19.51 0.000007Upper 5000 100-Yr 12000.00 -18.90 12.05 30.95 1.58 0.02 7587.78 381.07 19.91 388.69 19.52 0.000013Upper 5000 100-Yr+20% 14400.00 -18.90 12.07 30.97 1.90 0.02 7595.81 381.21 19.93 388.84 19.53 0.000019
Upper 4800 Mean 1340.00 -18.70 12.00 30.70 0.17 0.00 8068.60 397.41 20.30 406.11 19.87 0.000000Upper 4800 2-Yr 8400.00 -18.70 12.02 30.72 1.04 0.01 8077.86 397.72 20.31 406.43 19.88 0.000006Upper 4800 100-Yr 12000.00 -18.70 12.05 30.75 1.48 0.01 8087.74 398.05 20.32 406.77 19.88 0.000012Upper 4800 100-Yr+20% 14400.00 -18.70 12.07 30.77 1.78 0.02 8096.26 398.33 20.33 407.06 19.89 0.000017
Upper 4600 Mean 1340.00 -18.30 12.00 30.30 0.13 0.00 10402.75 547.23 19.01 556.55 18.69 0.000000Upper 4600 2-Yr 8400.00 -18.30 12.03 30.33 0.81 0.00 10417.51 547.39 19.03 556.73 18.71 0.000004Upper 4600 100-Yr 12000.00 -18.30 12.06 30.36 1.15 0.01 10433.24 547.56 19.05 556.92 18.73 0.000008Upper 4600 100-Yr+20% 14400.00 -18.30 12.08 30.38 1.38 0.01 10446.81 547.71 19.07 557.09 18.75 0.000011
Upper 4400 Mean 1340.00 -18.20 12.00 30.20 0.13 0.00 10204.43 547.95 18.62 556.85 18.33 0.000000Upper 4400 2-Yr 8400.00 -18.20 12.03 30.23 0.82 0.00 10218.56 548.10 18.64 557.02 18.34 0.000004Upper 4400 100-Yr 12000.00 -18.20 12.05 30.25 1.17 0.01 10233.64 548.27 18.67 557.21 18.37 0.000008Upper 4400 100-Yr+20% 14400.00 -18.20 12.08 30.28 1.41 0.01 10246.64 548.41 18.68 557.37 18.38 0.000012
Upper 4200 Mean 1340.00 -19.80 12.00 31.80 0.13 0.00 10589.48 557.02 19.01 564.65 18.75 0.000000Upper 4200 2-Yr 8400.00 -19.80 12.03 31.83 0.79 0.00 10603.73 557.17 19.03 564.82 18.77 0.000004Upper 4200 100-Yr 12000.00 -19.80 12.05 31.85 1.13 0.01 10618.92 557.33 19.05 565.00 18.79 0.000007Upper 4200 100-Yr+20% 14400.00 -19.80 12.08 31.88 1.35 0.01 10632.03 557.47 19.07 565.16 18.81 0.000010
Upper 4000 Mean 1340.00 -20.10 12.00 32.10 0.13 0.00 10621.41 549.34 19.33 557.17 19.06 0.000000Upper 4000 2-Yr 8400.00 -20.10 12.03 32.13 0.79 0.00 10635.10 549.47 19.36 557.32 19.08 0.000003Upper 4000 100-Yr 12000.00 -20.10 12.05 32.15 1.13 0.01 10649.71 549.61 19.38 557.48 19.10 0.000007Upper 4000 100-Yr+20% 14400.00 -20.10 12.08 32.18 1.35 0.01 10662.32 549.74 19.40 557.62 19.12 0.000010
Upper 3800 Mean 1340.00 -21.80 12.00 33.80 0.13 0.00 9977.87 531.41 18.78 541.73 18.42 0.000000Upper 3800 2-Yr 8400.00 -21.80 12.02 33.82 0.84 0.00 9989.99 531.54 18.79 541.88 18.44 0.000004Upper 3800 100-Yr 12000.00 -21.80 12.05 33.85 1.20 0.01 10002.93 531.68 18.81 542.03 18.45 0.000008Upper 3800 100-Yr+20% 14400.00 -21.80 12.07 33.87 1.44 0.01 10014.09 531.80 18.83 542.17 18.47 0.000012
Upper 3600 Mean 1340.00 -20.40 12.00 32.40 0.14 0.00 9645.69 483.03 19.97 493.16 19.56 0.000000Upper 3600 2-Yr 8400.00 -20.40 12.02 32.42 0.87 0.00 9655.93 483.08 19.99 493.23 19.58 0.000004Upper 3600 100-Yr 12000.00 -20.40 12.04 32.44 1.24 0.01 9666.84 483.14 20.01 493.30 19.60 0.000008Upper 3600 100-Yr+20% 14400.00 -20.40 12.06 32.46 1.49 0.01 9676.27 483.19 20.03 493.37 19.61 0.000012
Upper 3400 Mean 1340.00 -19.20 12.00 31.20 0.16 0.00 8594.54 453.66 18.95 462.24 18.59 0.000000Upper 3400 2-Yr 8400.00 -19.20 12.02 31.22 0.98 0.01 8602.25 453.71 18.96 462.31 18.61 0.000005Upper 3400 100-Yr 12000.00 -19.20 12.04 31.24 1.39 0.01 8610.48 453.76 18.98 462.38 18.62 0.000011Upper 3400 100-Yr+20% 14400.00 -19.20 12.05 31.25 1.67 0.02 8617.59 453.81 18.99 462.44 18.64 0.000016
Upper 3200 Mean 1340.00 -19.00 12.00 31.00 0.15 0.00 8767.70 479.31 18.29 487.26 17.99 0.000000Upper 3200 2-Yr 8400.00 -19.00 12.02 31.02 0.96 0.01 8775.52 479.38 18.31 487.35 18.01 0.000005Upper 3200 100-Yr 12000.00 -19.00 12.03 31.03 1.37 0.01 8783.88 479.46 18.32 487.44 18.02 0.000011Upper 3200 100-Yr+20% 14400.00 -19.00 12.05 31.05 1.64 0.02 8791.10 479.54 18.33 487.52 18.03 0.000016
Upper 3000 Mean 1340.00 -19.00 12.00 31.00 0.15 0.00 8982.59 497.68 18.05 509.15 17.64 0.000000Upper 3000 2-Yr 8400.00 -19.00 12.02 31.02 0.93 0.01 8990.41 497.75 18.06 509.23 17.66 0.000005Upper 3000 100-Yr 12000.00 -19.00 12.03 31.03 1.33 0.01 8998.77 497.82 18.08 509.31 17.67 0.000011Upper 3000 100-Yr+20% 14400.00 -19.00 12.05 31.05 1.60 0.02 9005.99 497.88 18.09 509.39 17.68 0.000016
Upper 2800 Mean 1340.00 -18.60 12.00 30.60 0.14 0.00 9269.57 508.87 18.22 517.71 17.91 0.000000Upper 2800 2-Yr 8400.00 -18.60 12.02 30.62 0.91 0.01 9277.34 508.92 18.23 517.77 17.92 0.000005Upper 2800 100-Yr 12000.00 -18.60 12.03 30.63 1.29 0.01 9285.65 508.97 18.24 517.83 17.93 0.000010Upper 2800 100-Yr+20% 14400.00 -18.60 12.05 30.65 1.55 0.02 9292.83 509.02 18.26 517.89 17.94 0.000014
Upper 2600 Mean 1340.00 -18.20 12.00 30.20 0.15 0.00 9234.15 511.23 18.06 519.69 17.77 0.000000Upper 2600 2-Yr 8400.00 -18.20 12.01 30.21 0.91 0.01 9241.41 511.27 18.08 519.75 17.78 0.000005Upper 2600 100-Yr 12000.00 -18.20 12.03 30.23 1.30 0.01 9249.16 511.32 18.09 519.81 17.79 0.000010Upper 2600 100-Yr+20% 14400.00 -18.20 12.04 30.24 1.56 0.02 9255.86 511.36 18.10 519.86 17.80 0.000015
Upper 2400 Mean 1340.00 -18.30 12.00 30.30 0.15 0.00 9186.71 503.36 18.25 512.42 17.93 0.000000Upper 2400 2-Yr 8400.00 -18.30 12.01 30.31 0.91 0.01 9193.29 503.40 18.26 512.48 17.94 0.000005Upper 2400 100-Yr 12000.00 -18.30 12.03 30.33 1.30 0.01 9200.31 503.45 18.27 512.54 17.95 0.000010Upper 2400 100-Yr+20% 14400.00 -18.30 12.04 30.34 1.56 0.02 9206.39 503.49 18.29 512.59 17.96 0.000015
Upper 2200 Mean 1340.00 -18.10 12.00 30.10 0.14 0.00 9591.23 544.98 17.60 551.05 17.41 0.000000Upper 2200 2-Yr 8400.00 -18.10 12.01 30.11 0.88 0.01 9598.23 545.02 17.61 551.10 17.42 0.000005Upper 2200 100-Yr 12000.00 -18.10 12.03 30.13 1.25 0.01 9605.71 545.06 17.62 551.15 17.43 0.000010Upper 2200 100-Yr+20% 14400.00 -18.10 12.04 30.14 1.50 0.02 9612.18 545.10 17.63 551.19 17.44 0.000014
Upper 2000 Mean 1340.00 -18.39 12.00 30.39 0.15 0.00 8754.25 474.21 18.46 481.49 18.18 0.000000Upper 2000 2-Yr 8400.00 -18.39 12.01 30.40 0.96 0.01 8758.66 474.26 18.47 481.54 18.19 0.000005Upper 2000 100-Yr 12000.00 -18.39 12.02 30.41 1.37 0.01 8763.37 474.31 18.48 481.60 18.20 0.000011Upper 2000 100-Yr+20% 14400.00 -18.39 12.03 30.42 1.64 0.02 8767.44 474.36 18.48 481.65 18.20 0.000016
Upper 1800 Mean 1340.00 -18.30 12.00 30.30 0.15 0.00 8780.26 504.77 17.39 512.67 17.13 0.000000Upper 1800 2-Yr 8400.00 -18.30 12.01 30.31 0.96 0.01 8784.42 505.03 17.39 512.94 17.13 0.000006Upper 1800 100-Yr 12000.00 -18.30 12.02 30.32 1.37 0.01 8788.88 505.31 17.39 513.23 17.12 0.000012Upper 1800 100-Yr+20% 14400.00 -18.30 12.02 30.32 1.64 0.02 8792.73 505.56 17.39 513.47 17.12 0.000017
Upper 1600 Mean 1340.00 -18.00 12.00 30.00 0.14 0.00 9344.85 519.18 18.00 528.12 17.69 0.000000
HEC-RAS Plan: Project_12ft River: Duwamish Reach: Upper (Continued)Reach River Sta Profile Q Total Min Ch El W.S. Elev Max Chl Dpth Vel Chnl Shear Chan Flow Area Top Width Hydr Depth C W.P. Channel Hydr Radius C E.G. Slope
(cfs) (ft) (ft) (ft) (ft/s) (lb/sq ft) (sq ft) (ft) (ft) (ft) (ft) (ft/ft)Upper 1600 2-Yr 8400.00 -18.00 12.01 30.01 0.90 0.01 9349.17 519.27 18.00 528.21 17.70 0.000005Upper 1600 100-Yr 12000.00 -18.00 12.02 30.02 1.28 0.01 9353.79 519.36 18.01 528.30 17.71 0.000010Upper 1600 100-Yr+20% 14400.00 -18.00 12.03 30.03 1.54 0.02 9357.79 519.43 18.02 528.38 17.71 0.000015
Upper 1400 Mean 1340.00 -18.20 12.00 30.20 0.13 0.00 10095.02 548.45 18.41 556.96 18.13 0.000000Upper 1400 2-Yr 8400.00 -18.20 12.01 30.21 0.83 0.00 10099.78 548.52 18.41 557.04 18.13 0.000004Upper 1400 100-Yr 12000.00 -18.20 12.02 30.22 1.19 0.01 10104.87 548.59 18.42 557.12 18.14 0.000008Upper 1400 100-Yr+20% 14400.00 -18.20 12.03 30.23 1.42 0.01 10109.26 548.66 18.43 557.18 18.14 0.000012
Upper 1200 Mean 1340.00 -19.50 12.00 31.50 0.09 0.00 15078.70 562.98 26.78 596.26 25.29 0.000000Upper 1200 2-Yr 8400.00 -19.50 12.01 31.51 0.56 0.00 15085.64 563.01 26.79 596.31 25.30 0.000001Upper 1200 100-Yr 12000.00 -19.50 12.03 31.53 0.80 0.00 15093.04 563.04 26.81 596.35 25.31 0.000002Upper 1200 100-Yr+20% 14400.00 -19.50 12.04 31.54 0.95 0.01 15099.45 563.07 26.82 596.39 25.32 0.000003
Upper 1000 Mean 1340.00 -20.00 12.00 32.00 0.10 0.00 13241.80 551.03 24.03 560.88 23.61 0.000000Upper 1000 2-Yr 8400.00 -20.00 12.01 32.01 0.63 0.00 13247.60 551.10 24.04 560.97 23.62 0.000002Upper 1000 100-Yr 12000.00 -20.00 12.02 32.02 0.91 0.01 13253.79 551.18 24.05 561.06 23.62 0.000003Upper 1000 100-Yr+20% 14400.00 -20.00 12.03 32.03 1.09 0.01 13259.14 551.25 24.05 561.14 23.63 0.000005
Upper 800 Mean 1340.00 -20.00 12.00 32.00 0.14 0.00 9709.57 480.67 20.20 489.29 19.84 0.000000Upper 800 2-Yr 8400.00 -20.00 12.00 32.00 0.86 0.00 9711.63 480.69 20.20 489.31 19.85 0.000004Upper 800 100-Yr 12000.00 -20.00 12.01 32.01 1.24 0.01 9713.83 480.70 20.21 489.33 19.85 0.000008Upper 800 100-Yr+20% 14400.00 -20.00 12.01 32.01 1.48 0.01 9715.73 480.72 20.21 489.34 19.85 0.000012
Upper 600 Mean 1340.00 -19.15 12.00 31.15 0.12 0.00 11271.22 521.81 21.60 533.91 21.11 0.000000Upper 600 2-Yr 8400.00 -19.15 12.01 31.15 0.75 0.00 11274.19 521.83 21.61 533.93 21.12 0.000003Upper 600 100-Yr 12000.00 -19.15 12.01 31.16 1.06 0.01 11277.37 521.84 21.61 533.95 21.12 0.000005Upper 600 100-Yr+20% 14400.00 -19.15 12.02 31.17 1.28 0.01 11280.11 521.86 21.62 533.96 21.13 0.000008
Upper 400 Mean 1340.00 -19.00 12.00 31.00 0.13 0.00 10411.48 478.77 21.75 488.79 21.30 0.000000Upper 400 2-Yr 8400.00 -19.00 12.00 31.00 0.81 0.00 10413.17 478.78 21.75 488.80 21.30 0.000003Upper 400 100-Yr 12000.00 -19.00 12.01 31.01 1.15 0.01 10414.99 478.79 21.75 488.82 21.31 0.000006Upper 400 100-Yr+20% 14400.00 -19.00 12.01 31.01 1.38 0.01 10416.55 478.80 21.76 488.83 21.31 0.000009
Upper 200 Mean 1340.00 -19.00 12.00 31.00 0.14 0.00 9545.62 467.47 20.42 474.22 20.13 0.000000Upper 200 2-Yr 8400.00 -19.00 12.00 31.00 0.88 0.01 9545.99 467.48 20.42 474.23 20.13 0.000004Upper 200 100-Yr 12000.00 -19.00 12.00 31.00 1.26 0.01 9546.39 467.49 20.42 474.24 20.13 0.000008Upper 200 100-Yr+20% 14400.00 -19.00 12.00 31.00 1.51 0.01 9546.74 467.49 20.42 474.24 20.13 0.000012
Upper 0 Mean 1340.00 -19.10 12.00 31.10 0.14 0.00 9535.58 457.17 20.86 464.39 20.53 0.000000Upper 0 2-Yr 8400.00 -19.10 12.00 31.10 0.88 0.01 9535.58 457.17 20.86 464.39 20.53 0.000004Upper 0 100-Yr 12000.00 -19.10 12.00 31.10 1.26 0.01 9535.58 457.17 20.86 464.39 20.53 0.000008Upper 0 100-Yr+20% 14400.00 -19.10 12.00 31.10 1.51 0.01 9535.58 457.17 20.86 464.39 20.53 0.000011
0 1000 2000 3000 4000 5000 6000-25
-20
-15
-10
-5
0
5
10
15
Duwamish Plant 2 Plan: Duwamish-Project-Steady_12ft 8/25/2011
Channel Distance (ft)
Ele
vatio
n (f
t)
Legend
EG 100-Yr+20%
EG 100-Yr
EG 2-Yr
EG Mean
WS 100-Yr
WS 2-Yr
WS 100-Yr+20%
WS Mean
Crit 100-Yr+20%
Crit 100-Yr
Crit 2-Yr
Crit Mean
Ground
Duwamish Upper
0 200 400 600 800-15
-10
-5
0
5
10
15
20
Duwamish Plant 2 Plan: Duwamish-Project-Steady_12ft 8/25/2011 RS = 5651
Station (ft)
Ele
vatio
n (ft
)
Legend
EG 100-Yr+20%
WS 100-Yr+20%
0.0 ft/s
0.5 ft/s
1.0 ft/s
1.5 ft/s
2.0 ft/s
2.5 ft/s
Ground
Bank Sta
.05 .025 .05
0 200 400 600 800-20
-15
-10
-5
0
5
10
15
20
Duwamish Plant 2 Plan: Duwamish-Project-Steady_12ft 8/25/2011 RS = 5451
Station (ft)
Ele
vatio
n (ft
)
Legend
EG 100-Yr+20%
WS 100-Yr+20%
0.0 ft/s
0.5 ft/s
1.0 ft/s
1.5 ft/s
2.0 ft/s
2.5 ft/s
Ground
Bank Sta
.05 .025 .05
0 200 400 600 800-20
-15
-10
-5
0
5
10
15
20
Duwamish Plant 2 Plan: Duwamish-Project-Steady_12ft 8/25/2011 RS = 5200
Station (ft)
Ele
vatio
n (ft
)
Legend
EG 100-Yr+20%
WS 100-Yr+20%
0.0 ft/s
0.5 ft/s
1.0 ft/s
1.5 ft/s
2.0 ft/s
Ground
Bank Sta
.05 .025 .05
0 200 400 600 800-20
-10
0
10
20
Duwamish Plant 2 Plan: Duwamish-Project-Steady_12ft 8/25/2011 RS = 5000
Station (ft)
Ele
vatio
n (ft
)
Legend
EG 100-Yr+20%
WS 100-Yr+20%
0.0 ft/s
0.5 ft/s
1.0 ft/s
1.5 ft/s
2.0 ft/s
2.5 ft/s
Ground
Bank Sta
.05 .025 .05
0 200 400 600 800-20
-10
0
10
20
Duwamish Plant 2 Plan: Duwamish-Project-Steady_12ft 8/25/2011 RS = 4800
Station (ft)
Ele
vatio
n (ft
)
Legend
EG 100-Yr+20%
WS 100-Yr+20%
0.0 ft/s
0.5 ft/s
1.0 ft/s
1.5 ft/s
2.0 ft/s
2.5 ft/s
Ground
Bank Sta
.05 .025 .05
0 200 400 600 800-20
-15
-10
-5
0
5
10
15
20
Duwamish Plant 2 Plan: Duwamish-Project-Steady_12ft 8/25/2011 RS = 4600
Station (ft)
Ele
vatio
n (ft
)
Legend
EG 100-Yr+20%
WS 100-Yr+20%
0.0 ft/s
0.5 ft/s
1.0 ft/s
1.5 ft/s
2.0 ft/s
Ground
Bank Sta
.05 .025 .05
0 200 400 600 800-20
-15
-10
-5
0
5
10
15
20
Duwamish Plant 2 Plan: Duwamish-Project-Steady_12ft 8/25/2011 RS = 4400
Station (ft)
Ele
vatio
n (ft
)
Legend
EG 100-Yr+20%
WS 100-Yr+20%
0.0 ft/s
0.5 ft/s
1.0 ft/s
1.5 ft/s
2.0 ft/s
Ground
Bank Sta
.05 .025 .05
0 200 400 600 800-20
-10
0
10
20
Duwamish Plant 2 Plan: Duwamish-Project-Steady_12ft 8/25/2011 RS = 4200
Station (ft)
Ele
vatio
n (ft
)
Legend
EG 100-Yr+20%
WS 100-Yr+20%
0.0 ft/s
0.5 ft/s
1.0 ft/s
1.5 ft/s
2.0 ft/s
Ground
Bank Sta
.05 .025 .05
0 200 400 600 800-30
-20
-10
0
10
20
Duwamish Plant 2 Plan: Duwamish-Project-Steady_12ft 8/25/2011 RS = 4000
Station (ft)
Ele
vatio
n (ft
)
Legend
EG 100-Yr+20%
WS 100-Yr+20%
0.0 ft/s
0.5 ft/s
1.0 ft/s
1.5 ft/s
2.0 ft/s
Ground
Bank Sta
.05 .025 .05
0 200 400 600 800-30
-20
-10
0
10
20
Duwamish Plant 2 Plan: Duwamish-Project-Steady_12ft 8/25/2011 RS = 3800
Station (ft)
Ele
vatio
n (ft
)
Legend
EG 100-Yr+20%
WS 100-Yr+20%
0.0 ft/s
0.5 ft/s
1.0 ft/s
1.5 ft/s
2.0 ft/s
Ground
Bank Sta
.05 .025 .05
0 200 400 600 800-30
-20
-10
0
10
20
Duwamish Plant 2 Plan: Duwamish-Project-Steady_12ft 8/25/2011 RS = 3600
Station (ft)
Ele
vatio
n (ft
)
Legend
EG 100-Yr+20%
WS 100-Yr+20%
0.0 ft/s
0.5 ft/s
1.0 ft/s
1.5 ft/s
2.0 ft/s
Ground
Bank Sta
.05 .025 .05
0 200 400 600 800-20
-10
0
10
20
Duwamish Plant 2 Plan: Duwamish-Project-Steady_12ft 8/25/2011 RS = 3400
Station (ft)
Ele
vatio
n (ft
)
Legend
EG 100-Yr+20%
WS 100-Yr+20%
0.0 ft/s
0.5 ft/s
1.0 ft/s
1.5 ft/s
2.0 ft/s
2.5 ft/s
Ground
Bank Sta
.05 .025 .05
0 200 400 600 800-20
-10
0
10
20
Duwamish Plant 2 Plan: Duwamish-Project-Steady_12ft 8/25/2011 RS = 3200
Station (ft)
Ele
vatio
n (ft
)
Legend
EG 100-Yr+20%
WS 100-Yr+20%
0.0 ft/s
0.5 ft/s
1.0 ft/s
1.5 ft/s
2.0 ft/s
2.5 ft/s
Ground
Bank Sta
.05 .025 .05
0 200 400 600 800-20
-10
0
10
20
Duwamish Plant 2 Plan: Duwamish-Project-Steady_12ft 8/25/2011 RS = 3000
Station (ft)
Ele
vatio
n (ft
)
Legend
EG 100-Yr+20%
WS 100-Yr+20%
0.0 ft/s
0.5 ft/s
1.0 ft/s
1.5 ft/s
2.0 ft/s
2.5 ft/s
Ground
Bank Sta
.05 .025 .05
0 200 400 600 800-20
-10
0
10
20
Duwamish Plant 2 Plan: Duwamish-Project-Steady_12ft 8/25/2011 RS = 2800
Station (ft)
Ele
vatio
n (ft
)
Legend
EG 100-Yr+20%
WS 100-Yr+20%
0.0 ft/s
0.5 ft/s
1.0 ft/s
1.5 ft/s
2.0 ft/s
Ground
Bank Sta
.05 .025 .05
0 200 400 600 800-20
-15
-10
-5
0
5
10
15
20
Duwamish Plant 2 Plan: Duwamish-Project-Steady_12ft 8/25/2011 RS = 2600
Station (ft)
Ele
vatio
n (ft
)
Legend
EG 100-Yr+20%
WS 100-Yr+20%
0.0 ft/s
0.5 ft/s
1.0 ft/s
1.5 ft/s
2.0 ft/s
Ground
Bank Sta
.05 .025 .05
0 200 400 600 800-20
-15
-10
-5
0
5
10
15
20
Duwamish Plant 2 Plan: Duwamish-Project-Steady_12ft 8/25/2011 RS = 2400
Station (ft)
Ele
vatio
n (ft
)
Legend
EG 100-Yr+20%
WS 100-Yr+20%
0.0 ft/s
0.5 ft/s
1.0 ft/s
1.5 ft/s
2.0 ft/s
Ground
Bank Sta
.05 .025 .05
0 200 400 600 800-20
-15
-10
-5
0
5
10
15
20
Duwamish Plant 2 Plan: Duwamish-Project-Steady_12ft 8/25/2011 RS = 2200
Station (ft)
Ele
vatio
n (ft
)
Legend
EG 100-Yr+20%
WS 100-Yr+20%
0.0 ft/s
0.5 ft/s
1.0 ft/s
1.5 ft/s
2.0 ft/s
Ground
Bank Sta
.05 .025 .05
0 200 400 600 800-20
-10
0
10
20
30
Duwamish Plant 2 Plan: Duwamish-Project-Steady_12ft 8/25/2011 RS = 2000
Station (ft)
Ele
vatio
n (ft
)
Legend
EG 100-Yr+20%
WS 100-Yr+20%
0.0 ft/s
0.5 ft/s
1.0 ft/s
1.5 ft/s
2.0 ft/s
2.5 ft/s
Ground
Bank Sta
.05 .025 .05
0 200 400 600 800-20
-15
-10
-5
0
5
10
15
20
Duwamish Plant 2 Plan: Duwamish-Project-Steady_12ft 8/25/2011 RS = 1800
Station (ft)
Ele
vatio
n (ft
)
Legend
EG 100-Yr+20%
WS 100-Yr+20%
0.0 ft/s
0.5 ft/s
1.0 ft/s
1.5 ft/s
2.0 ft/s
Ground
Bank Sta
.05 .025 .05
0 200 400 600 800-20
-15
-10
-5
0
5
10
15
20
Duwamish Plant 2 Plan: Duwamish-Project-Steady_12ft 8/25/2011 RS = 1600
Station (ft)
Ele
vatio
n (ft
)
Legend
EG 100-Yr+20%
WS 100-Yr+20%
0.0 ft/s
0.5 ft/s
1.0 ft/s
1.5 ft/s
2.0 ft/s
Ground
Bank Sta
.05 .025 .05
0 200 400 600 800-20
-10
0
10
20
Duwamish Plant 2 Plan: Duwamish-Project-Steady_12ft 8/25/2011 RS = 1400
Station (ft)
Ele
vatio
n (ft
)
Legend
EG 100-Yr+20%
WS 100-Yr+20%
0.0 ft/s
0.5 ft/s
1.0 ft/s
1.5 ft/s
2.0 ft/s
Ground
Bank Sta
.05 .025 .05
0 200 400 600 800-20
-10
0
10
20
Duwamish Plant 2 Plan: Duwamish-Project-Steady_12ft 8/25/2011 RS = 1200
Station (ft)
Ele
vatio
n (ft
)
Legend
EG 100-Yr+20%
WS 100-Yr+20%
0.0 ft/s
0.2 ft/s
0.4 ft/s
0.6 ft/s
0.8 ft/s
1.0 ft/s
1.2 ft/s
Ground
Bank Sta
.05 .025
0 200 400 600 800-20
-10
0
10
20
Duwamish Plant 2 Plan: Duwamish-Project-Steady_12ft 8/25/2011 RS = 1000
Station (ft)
Ele
vatio
n (ft
)
Legend
EG 100-Yr+20%
WS 100-Yr+20%
0.0 ft/s
0.2 ft/s
0.4 ft/s
0.6 ft/s
0.8 ft/s
1.0 ft/s
1.2 ft/s
1.4 ft/s
Ground
Bank Sta
.05 .025 .05
0 200 400 600 800-20
-10
0
10
20
Duwamish Plant 2 Plan: Duwamish-Project-Steady_12ft 8/25/2011 RS = 800
Station (ft)
Ele
vatio
n (ft
)
Legend
EG 100-Yr+20%
WS 100-Yr+20%
0.0 ft/s
0.5 ft/s
1.0 ft/s
1.5 ft/s
2.0 ft/s
Ground
Bank Sta
.05 .025 .05
0 200 400 600 800-20
-10
0
10
20
Duwamish Plant 2 Plan: Duwamish-Project-Steady_12ft 8/25/2011 RS = 600
Station (ft)
Ele
vatio
n (ft
)
Legend
EG 100-Yr+20%
WS 100-Yr+20%
0.2 ft/s
0.4 ft/s
0.6 ft/s
0.8 ft/s
1.0 ft/s
1.2 ft/s
1.4 ft/s
1.6 ft/s
Ground
Bank Sta
.05 .025 .05
0 200 400 600 800-20
-10
0
10
20
Duwamish Plant 2 Plan: Duwamish-Project-Steady_12ft 8/25/2011 RS = 400
Station (ft)
Ele
vatio
n (ft
)
Legend
EG 100-Yr+20%
WS 100-Yr+20%
0.0 ft/s
0.5 ft/s
1.0 ft/s
1.5 ft/s
2.0 ft/s
Ground
Bank Sta
.05 .025 .05
0 200 400 600 800-20
-10
0
10
20
Duwamish Plant 2 Plan: Duwamish-Project-Steady_12ft 8/25/2011 RS = 200
Station (ft)
Ele
vatio
n (ft
)
Legend
EG 100-Yr+20%
WS 100-Yr+20%
0.0 ft/s
0.5 ft/s
1.0 ft/s
1.5 ft/s
2.0 ft/s
Ground
Bank Sta
.05 .025 .05
0 200 400 600 800-20
-10
0
10
20
Duwamish Plant 2 Plan: Duwamish-Project-Steady_12ft 8/25/2011 RS = 0
Station (ft)
Ele
vatio
n (ft
)
Legend
EG 100-Yr+20%
WS 100-Yr+20%
Crit 100-Yr+20%
0.0 ft/s
0.5 ft/s
1.0 ft/s
1.5 ft/s
2.0 ft/s
Ground
Bank Sta
.05 .025 .05
Appendix E(on CD)
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Appendix F(on CD)
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