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Eastern Snake Plain Aquifer Model: Design and Use. WIMS Conference – Sept. 14, 2006 Allan Wylie, Hydrologist Hydrology Section, IDWR Michael Ciscell - Sr. GIS Analyst Adjudication Bureau, IDWR. Outline. Location Model Committee Introduction to the Model Model Inputs Model Structure

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eastern snake plain aquifer model design and use
Eastern Snake Plain Aquifer Model:Design and Use

WIMS Conference – Sept. 14, 2006

Allan Wylie, Hydrologist

Hydrology Section, IDWR

Michael Ciscell - Sr. GIS Analyst

Adjudication Bureau, IDWR

outline
Outline
  • Location
  • Model Committee
  • Introduction to the Model
    • Model Inputs
    • Model Structure
    • Calibration Targets
  • How the Model is Used
eastern snake hydrologic modeling committee
Eastern Snake Hydrologic Modeling Committee
  • Comprised of professionals working on Idaho water issues on the eastern Snake Plain
  • Agency representative
    • IDWR, BOR, USGS, US Fish and Wildlife Service
  • Industry Representative
    • Idaho Power Co
  • Researchers
    • U of I, IWRRI
  • Consultants
    • Surface water users, ground water users, spring users
model inputs
Model Inputs
  • Identify Budget Components
    • Hydrogeologic processes
    • Prior studies
    • Input from ESHMC
formalize representation of budget components
Formalize Representationof Budget Components
  • Guided by purpose of projectand natureof studyarea
  • Focus on components most likely to

reduce model

uncertainty

assemble test budget
Assemble & Test Budget

Assemble

Sense

Check

Sense

Check

Test

Calibration

Balance

Sense

Check

model structure
Model Structure
  • Numerical model
  • Grid
    • Number of rows, number of columns, number of layers
  • River representation
  • Springs representation
  • Data
    • Water table elevation
    • Snake River
      • Compute ground water contribution to river or river contribution to ground water
        • Gains or losses
    • Irrigated lands/Consumptive Use
    • PODs w/Priority Date & Rate of Diversion
slide9
Grid
  • Rotation 31.4˚ counter clockwise
  • 104 rows
  • 209 columns
  • 1 mi by 1 mi
  • 1 layer
snake river
Snake River
  • 5 river reaches above Minidoka
    • Ashton to Rexburg
    • Heise to Shelly
    • Shelly to near Blackfoot
    • Near Blackfoot to Neeley
    • Neeley to Minidoka
    • Minidoka to Milner/Springs
      • Gains not statistically significant
springs
Springs
  • 6 Spring reaches
    • Devils Washbowl – Buhl
    • Buhl – Thousand Springs
    • Thousand Springs
    • Thousand Springs – Malad
    • Malad
    • Malad – Bancroft
  • 45 drain cells
calibration targets
Calibration Targets
  • Water table elevation data
    • USGS data
    • IDWR data
  • Reach gain and loss data
    • IDWR reach gain and loss program
      • USGS gaging station data
      • Watermaster diversion data
water table elevation
Water Table Elevation
  • Steady State -
    • No change in magnitude or direction of ground water flow
      • Rarely occurs in nature,
      • important in modeling
  • Transient
    • Seasonal
    • Mass measurement
    • Trend
steady state
Steady State
  • May 1, 1982 to November 1, 2000
  • All water table elevation observations averaged
    • 1008 observations
snake river15
Snake River
  • Snake River reaches
  • Monthly gains and losses for five river reaches
snake river16
Snake River
  • Ashton to Rexburg
springs17
Springs
  • Nine springs with significant time series
the model
The Model
  • Steady state
    • 1008 water table elevation observations
    • 5 Snake River gain and loss observations
    • 6 spring observations
  • Transient
    • 12717 water table elevation observations
    • 725 Snake River gain and loss observations
    • 1526 spring discharge observations
how the model is used
How the Model Is Used
  • Curtailment scenario
    • Demonstrate that the model could be used to simulate a curtailment of ground water users
  • CREP
    • Used to simulate effect of taking land out of production
  • Managed recharge
    • Simulate effect of proposed recharge projects
  • Conversion
    • Simulate effects of converting land from ground water to surface water irrigation
a curtailment scenario
A Curtailment Scenario
  • Uncertainty
  • Response functions
  • Model grid
  • Irrigated lands
  • Water rights data base
uncertainty
Uncertainty
  • Model is simulation
  • Model misfit
    • Standard error less than 20 ft
    • Water level change about 4000 ft
  • Measurement uncertainty
    • Largest is river gains
response function
Response Function
  • If left alone all aquifer water will discharge into the Snake River
  • Water pumped from anywhere in the aquifer would discharge to the Snake River
  • Water pumped may have come from the Snake River
  • Response Function is % of impact of that cell on the respective river reach
other uses
Other Uses
  • Managed Recharge
    • Simulate effect of proposed recharge projects
    • Project near Jerome is being worked
  • CREP
    • Used to simulate effect of taking land out of production
    • Applications being taken on Eastern Snake Plain
  • Conversion
    • Simulate effects of converting land from ground water to surface water irrigation
questions

Questions?

Allan.Wylie@idwr.idaho.gov

Michael.Ciscell@idwr.idaho.gov