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Direct Demands continued
Mining
Public Land
Recreation
Mining
Mining- Review of Current Plan
Very general
NotesSand
Black Dirt
Current Mines
Mining - Trends
FlatExtraction (NSC/Rehbein)
Excavation/Conversion
(The Lakes & Emily’s Waters)
Mining - Trends
Demand for
1. Dewatering
2. Water
Mining - Implications of Trends
Land Subsidence
Mining - Implications of Trends
Decrease in Groundwater Supplies
Mining - Implications of Trends
Increase in Evapotranspiration
Mining - Implications of Trends
Changes in Wetlands, Lakes, Trees and Parks
Mining - Expectations for Future Management1. Use sources other than groundwater (Partially
or entirely)
2. Import water
Mining - Expectations for Future Management
Changes in
rates
time and
spatial distribution
of pumping
Mining - Expectations for Future Management
Increase recharge (Infiltration zones)1. Recharge of surface water or reused water
(ground water or surface water)
Mining - Expectations for Future ManagementDecrease discharge
from groundwater
1. Decrease loss to evapotranspiration
2. Decrease potential loss to ET
Recreation Lands
Current Recreation Lands
Recreation -Review of Current Plan
Plan does not directly address recreational lands or uses of watershed resources
Facility Type # Acres Pct
Golf Courses 4 1,383 7%
Regional Parks 3 16,766 84%
City Parks 141 1,767 9%
Total 147 19,916
Recreation - Trends
Increase in navigation of the Creek
Increase in Lake use
Increased evaluation of ditch corridors for trail purposes
Recreation - Expectations for Management
Increased requests/complaints about keeping the channel clear
Need to discussPart of 103D mission but numbers are small
Public Land
Public Land - Current Plan
Public land and recreation facilities addressed together
Cites 10,000 acres of Public Land
GIS=11,687 acres
20% of watershed
Public Land - Trends
No additional acreage
Changes in operation & managementWatering
Use of chemicals (Highways)
Public Land Implications for Management
Contribution to loadings and associated costs becomes an issue
Increased need for SWPPPs/SAMPs
Public Land - Expectations for Management of Water
New ground for some public managers
Politics of Operations & Maintenance
Indirect DemandsFlood Control
Groundwater Recharge
Water Quality
Property Damage Avoided
Flood Control
Flood Control - Current PlanMaintain existing 100-year floodplain profiles
“No-net loss” of volume policy
Requires a permit to alter floodplain
100-yr elevations depend on maintained system
Flood Control - Current Plan
Management Principles1. ID Floodplain
2. ID Impact
3. Require replacementBy Volume
Within Relevant Reach
Flood Control - Trends
‘The Lakes’ decreased amount of floodplain by 1,000 acres
Drought has influenced flooding in last 10 years
Flood Control - Trends
Ponding has reduced peaks + sustained flows at lower elevations
Infiltration will decrease volume
Flood Control - Implications
If climate is changing, could experience:
More “localized” Regional flood events
Storms outside the “normal” distributionHigher Highs
Lower Lows
Flood Control - Expectations for ManagementPublic comment/pressure on
Dry ponds
Over-designed ponds
Unused
Restricted Land & Floodplain
Encumbered
Why are we paying to have Bart inoculated against
diseases he never gets?
Homer Simpson
Groundwater Recharge
Groundwater Recharge Current Plan
Focus on flood prevention from high water table
Recognizes varying availability of groundwater
Requires first inch infiltrated
Groundwater Recharge -Trends
Fewer areas not ‘hardened’ by development
Groundwater Recharge Implications
The only way to influence surficial groundwater
Various methods will need to be considered
Groundwater Recharge Expectations for Management
Could become a major activity of District
Water Quality Improvement & Stormwater Protection
Water Quality & Stormwater Current PlanRegulate land management practices
Keep disturbed areas small
Stabilize soils ASAP
Require pretreatment
Standards are non-specific
Water Quality & Stormwater Current Plan
Keep Velocities low
Maintain existing flood profilesUse combination of successive BMPs
Utilize natural infrastructure within their capability
Require infiltration
Water Quality & Stormwater Trends
Flush effect in lower watershed
Increase in several parameters
Storm Related
Water Quality & Stormwater - ImplicationsExceeding standards for
Turbidity
Total Suspended Solids
Phosphorus
Lower (older) portion of the watershed lacks infrastructure needed for water quality
Water Quality & Stormwater - Expectations“Impaired” listing for
Turbidity
Phosphorus
Active retrofitting lower creek
Creative infrastructure/close coordination with City
Questions?
Thank You
Coon Creek Watershed District
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