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Western placer county groundwater management plan model. Model Development and Site Conceptual Model. Model Domain. Bear River. Sierra Nevada. Feather River. Sacramento River. Mokelumne River. Model Layering and Outcrops. Riverbank Formation. Model Layer 1. View Facing North. - PowerPoint PPT Presentation
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WESTERN PLACER COUNTY GROUNDWATER
MANAGEMENT PLAN MODELModel Development and Site Conceptual
Model
Model Domain
Bear River
Feather River
Sacramento River
Sierra Nevada
Mokelumne River
Area Acres % Model Domain
North American Sub Basin 340,170 39.2%
South American Sub Basin 247,745 28.5%
Cosumnes Sub Basin 280,490 32.3%
Total Model Domain Acreage: 868,405 100.0%
AREAS
Model Layering and Outcrops
Riverbank FormationView Facing North View Facing South
General Features:
Middle to Late Pleistocene deposits (formerly the Victor Formation)
Consists of sands, silts, and clays from floodplain and alluvial deposits
Superjacent ancestral stream channels cut across this formation creating
lateral channels of gravels and unconsolidated sediments
Hardpan deposits are prevalent in this formation that inhibit vertical
infiltration of recharge from applied water and precipitation
Model Layer 1
Turlock Lake Laguna Formation
View Facing North View Facing South
General Features:
Early Pleistocene to late Pliocene deposits (formerly the Fair Oaks Formation)
Predominantly consists of sands, silts, and clays
Superjacent ancestral stream channels cut across this formation, creating
lateral channels of gravels and unconsolidated sediments
Characteristic feature: white to grey tuff and tuffaceous silts “white clay”
Model Layers 2 and 3
Mehrten FormationView Facing North View Facing South
General Features:
Pliocene deposits formed during an erosional sequence following chain of
volcanic eruptions
Composed of two dominant units: Black andesitic sands “salt and pepper sand” and
blue and brown clays Hard gray and black tuff-breccias “lava”
Localized confining units , degree of confinement increases to the west
Significant water bearing unit
Model Layers 4 and 5
Valley Springs FormationView Facing North View Facing South
General Features:
Middle Miocene deposits formed during sequence of volcanic eruptions
Consists of rhyolite ash, quartz sand , and ashy clay
Characteristic features: olive green – greenish gray tone of clays, silts
Typically low permeable deposits
Near Lincoln area, productive zone with upward groundwater gradients
Model Layer 6
Ione FormationView Facing North View Facing South
General Features:
Consists primarily of sandstone and clays deposited during the Eocene epoch,
a time when the ancient sea became fresh to brackish.
The Ione Formation outcrops to the east, where freshwater remains at
shallow depths
Generally low in permeability, although secondary fracturing near the
outcrops is believed to provide a source of water to unit
Model Layer 7
GeoSections
Hydrogeology
Ancestral Streams
Rivers
Rivers
Begin with a simplified approach
River stage data used as model input
Flow data used for calibration (net flux)
Locations along the Sacramento River have been
adjusted for tidal influences
Flow at river confluences estimated using upstream
gages
Assumption that a portion of the flow discharges
from the Sacramento River to the Deep Water Channel and Steamboat Slough
Streams package is available if warranted
Recharge
Estimating Recharge in the WPCGMP Model:
Gridded Surface Subsurface Hydrologic Analysis
Simulation Modeling (GSSHA):• 2D Grid Based Hydrologic Model• Overland Flow, Stream Flow,
Infiltration• Soil Data (Soil Data Mart)• Land Use Data (Farm Data)• Precipitation Gages• Meteorological Data• Water Year Classifications• Custom codes for output and
data processing
GSSHA Simulations run for representative water
years to develop recharge factors for specific water year classifications
19 Soil Type Land Use Combinations (STLUs)
Recharge factors for each of the 19 STLUs were
developed, accounting for change in land use and water year type, and used to develop subsurface infiltration from precipitation and applied irrigation water and inflow from ungaged watersheds
1
2
3
45
67
Ungaged Watersh
eds
Recharge Work Flow
ESRI Model Builder Applications
Estimating Recharge in the WPCGMP Model :
Parameter-elevation Regressions on Independent Slope Model (PRISM)
monthly gridded precipitation data published by the PRISM Climate Group (monthly)
• Correlation with local rainfall gages
Applied water from irrigation (monthly) – output from Water Demand
Model
Recharge factors from GSSHA simulation modeling
GMS Zone Codes
GMS Zone Codes
• Assignment of
Demand Factors
• Budget Summary
• Supply Data
• Surface Water
Supply
• Additional Groundwater Pumping
Land Use Patterns
Master Land Use File
Farm Data
Change from Non-urban to Urban
Supply and Delivery Data
Groundwater Supply Data
Surface Water Delivery Data
SGA Data Management System
City of Lincoln Summary Data
City of Roseville Supply Data
City of Lincoln Supply Data
SGA Data Management System
Western Placer Groundwater Storage Study
Surface Water Entitlements PCWA City of Roseville City of Lincoln Natomas Central Mutual Water
Co. Pleasant-Grove Verona Mutual
Water Co. South-Sutter Water DistrictCity of Lincoln Groundwater
Management Plan City of Lincoln Supply and Private
Contracts 15% of private supply comes
from GW Nevada Irrigation District – all
SWFlorin-Vineyard Gap Community Plan Summary of Sacramento County
General Plan Master Water Study for the Florin-
Vineyard Community Plan Zone 41 Urban Water Management
Plan California American Water Supply
Assessment
Wrime Technical Report: Model Refinement North
Area Surface Water Delivery
Summary for: City of Sacramento Rio Linda/Elverta
Community WD Natomas Central Mutual
Water Co. City of Folsom Aerojet Area
Water Unit Demand Factors
Agricultural Demand Factors (DWR)
Urban Demand Factors
Water Year Index
2002 ITRC Crop Evapotranspiration
Rates for Eto Zone 14 ITRC Report 02-001,
funded by CALFED and Agricultural Research Initiative of California State Univ.
Model Output for Representative Water Years
Normalization Factor based on Water Year Index
Monthly Conversion
Factors
Water Demand Model
Workflow
Determine Change in Land Use (every two years)
Assign WUD factors (monthly) Regional Urban Demand Factors for “New Growth”
developed for each WP
Calculate Acreage
Calculate Total Demand (monthly)
Tabulate Total Surface Water Supply (monthly)
Tabulate Total Groundwater Pumping (monthly)
Tabulate Surface Water Entitlements (annual)
Assign Deficit in Budget to Existing Wells for each GMS Zone Code (monthly)
Comparison with Existing Models
SACIGSM v3
Aerojet Model
Modeling Platform: Public Code (MODFLOW) Public Code (MODFLOW)Proprietary Code (IGSM w updates)
Model Processes: Finite Difference Finite DifferenceFinite Element
Pre-Post Processors: GMS & Arc Hydro Groundwater GWVISTAS v 4.21IGSM
Domain: Regional (3 subbasins) Local Scale (Aerojet)Regional (multiple models)
Projection: NAD 83, State Plane, CA 2 (ft) NAD27, State Plane, CA2 (ft) UTM Zone 10, NAD27 (m)
Model Layers: 7 Layers 6 Layers5 Layers (2 fresh-water aq.)
Layering Approach: Wedge (outcrops) Flat – StackedFlat – Stacked
Base of Model: Modified Continental Deposits Bedrock/Cont. DepositsContinental Deposits (DWR)
Input Assignments: Materials Approach Grid AssignmentInterpolated Nodes
Conceptual Model: Stored in Model External to ModelExternal to Model
Grid Refinement: Automated, map over inputs Manual w/o CMManual
North Boundary: Bear River (gage data) General Heads Links to NARIGSM models
(post 1995 values held constant) South Boundary: Mokelumne River (gage data) No flow
Links to STNIGSM models
(post 1993 values held constant) West Boundary: Sacramento & Feather Rivers General Heads
Links to CVIIGSM models
(post 1995 values held constant) East Boundary: Ungaged Watersheds No flow
Ungaged Watersheds Primary Inflow: Streamflow Recharge
Deep Percolation Primary Outflow: Pumping Pumping
Pumping Calibration Period: 1998-2008 (Phase 1) 1956-2006
1969-2004
WPCGMP