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Metropolitan Groundwater Model for Water-Supply Availability Analysis. Technical Advisory Group Meeting June 19, 2008. Quick Review. Model Domain. Anoka. Entire 7 county metro Extend to edge of Mt. Simon – Hinckley Aquifer to NW 4913 sq miles Model cell size: 500m 417,793 active cells.

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metropolitan groundwater model for water supply availability analysis

Metropolitan Groundwater Model for Water-Supply Availability Analysis

Technical Advisory Group Meeting

June 19, 2008

model domain
Model Domain

Anoka

  • Entire 7 county metro
  • Extend to edge of Mt. Simon – Hinckley Aquifer to NW
  • 4913 sq miles
  • Model cell size: 500m
  • 417,793 active cells

Ramsey

Washington

Hennepin

Carver

Dakota

Scott

model layers

West

East

Dakota

Carver

Washington

Hennepin

St. Peter

Glacial Drift

Prairie du Chien

Jordan

St. Lawrence

Franconia

Mt Simon-Hinckley

Ironton-Galesville

Eau Clair

Model Layers
  • All major aquifers and aquitards included
  • Total of 9 Layers
rivers and streams
Rivers and Streams
  • All rivers and streams represented with lake package
river segments
River Segments
  • Each river broken into segments (reaches)
  • Stage based on topography or gage data
lakes
Lakes
  • Stage from DNR or DEM
  • Deeper lakes allowed to be in deeper layer
  • Represented with River Package
targets
Targets
  • 14,542 Head targets
    • SWL from CWI
  • 33 Baseflow targets
  • 55 Transmissivity targets
    • Pumping Tests
  • 378 Anisotropy targets
    • Penalty for Kz > Kx within a zone
head targets
Head Targets
  • 14,542 head targets
  • Static water levels from county well index
  • Cross-validated
baseflow
Baseflow
  • 33 baseflow reaches
s urface w ater b alance swb model for recharge

Temp,

Julian Day

Wind

Daily

Precipitation

EVAPOTRANSPIRATION

Topography(30-m Digital Elevation)

Land Use

(including imperviousness)

SURFACE

RUNOFF

Soil Type (Hydrologic

Classification)

RECHARGE

Surface Water Balance (SWB) Model for Recharge

(Adapted from Dripps and Bradbury, 2007)

swb recharge output
SWB Recharge Output
  • Mean recharge 1975-2003
  • 30m grid
calibration parameters
Calibration Parameters
  • 756 hydraulic conductivity zones
    • 378 Kx=Ky
    • 378 Kz
  • 8 lake conductance zones
  • 33 river conductance reaches
  • Recharge remained fixed
quaternary zones
Quaternary Zones
  • Zones roughly defined based on sand content
  • 65 zones
quaternary zones1
Quaternary Zones
  • Zones roughly defined based on sand content
  • 65 zones
jordan zones
Jordan Zones
  • 48 zones
  • Zones defined based on first bedrock unit and subdivided into additional zones
calibration stats
Calibration Stats
  • Mean Head Residual = -1.65 m
  • Residual Standard Deviation = 5.18 m
  • Minimum Head Residual = -31.21 m
  • Maximum Head Residual = 33.08 m
  • Total range of observed values = 125.27 m
  • Percent of head residuals within 5% of range = 93.2%
city of ramsey1
City of Ramsey

(Runkel, 2006)

regional model
Regional Model
  • Run regional model with 2050 average day pumping
  • Extract TMR for more detailed analysis
  • Used constant head boundaries at edge of TMR
municipal supply wells1
Municipal Supply Wells
  • Well spacing about 1 mile
grid refinement
Grid Refinement
  • Refine grid in the Ramsey area
ramsey well 7 pumping test1

Drawdown (m)

Time (days)

Ramsey Well 7 Pumping Test

Pumping Rate: 1000 gpm (constant)