Western placer county groundwater management plan model
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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.

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Western placer county groundwater management plan model

Western placer county groundwater management plan model

Model Development and Site Conceptual Model

Model domain
Model Domain

Bear River

Sierra Nevada

Feather River

Sacramento River

Mokelumne River

Riverbank formation
Riverbank Formation

Model Layer 1

View 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

Turlock lake laguna formation
Turlock Lake Laguna Formation

Model Layers 2 and 3

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”

Mehrten formation
Mehrten Formation

Model Layers 4 and 5

View 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

Valley springs formation
Valley Springs Formation

Model Layer 6

View 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

Ione formation
Ione Formation

Model Layer 7

View 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



  • 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


  • 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


Ungaged Watersheds







Recharge work flow
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

    • GMS Zone Codes

    • Assignment of

    • Demand Factors

    • Budget Summary

    • Supply Data

    • Surface Water

    • Supply

    • Additional

    • Groundwater

    • Pumping

    Land use patterns
    Land Use Patterns

    Master Land Use File

    Farm Data

    Change from Non-urban to Urban

    Supply and delivery data
    Supply and Delivery Data

    Groundwater Supply Data

    Western Placer Groundwater Storage Study

    • SGA Data Management System

    • City of Lincoln Summary Data

    • Surface Water Entitlements

      • PCWA

      • City of Roseville

      • City of Lincoln

      • Natomas Central Mutual Water Co.

      • Pleasant-Grove Verona Mutual Water Co.

      • South-Sutter Water District

    Surface Water Delivery Data

    • City of Roseville Supply Data

    • City of Lincoln Supply Data

    • SGA Data Management System

    City of Lincoln Groundwater Management Plan

    Wrime Technical Report:

    Model Refinement North Area

    • City of Lincoln Supply and Private Contracts

      • 15% of private supply comes from GW

      • Nevada Irrigation District – all SW

    • Surface Water Delivery Summary for:

      • City of Sacramento

      • Rio Linda/Elverta Community WD

      • Natomas Central Mutual Water Co.

      • City of Folsom

      • Aerojet Area

    Florin-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

    Water unit demand factors
    Water Unit Demand Factors

    Agricultural Demand Factors (DWR)

    • Model Output for Representative Water Years

    Urban Demand Factors

    • Normalization Factor based on Water Year Index

    Monthly Conversion 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.

    Water demand model
    Water Demand Model


    • 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
    Comparison with Existing Models


    Aerojet Model

    SACIGSM v3

    • Modeling Platform: Public Code (MODFLOW) Public Code (MODFLOW) Proprietary Code (IGSM w updates)

    • Model Processes: Finite Difference Finite Difference Finite Element

    • Pre-Post Processors: GMS & Arc Hydro Groundwater GWVISTAS v 4.21 IGSM

    • 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 Layers 5 Layers (2 fresh-water aq.)

    • Layering Approach: Wedge (outcrops) Flat – Stacked Flat – Stacked

    • Base of Model: Modified Continental Deposits Bedrock/Cont. Deposits Continental Deposits (DWR)

    • Input Assignments: Materials Approach Grid Assignment Interpolated Nodes

    • Conceptual Model: Stored in Model External to Model External to Model

    • Grid Refinement: Automated, map over inputs Manual w/o CMManual

    • North Boundary: Bear River (gage data) General HeadsLinks 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 HeadsLinks 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