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Add Groundwater Only Aggregate Structures

Irrigated parcels that receive only ground water supply are generally grouped together regionally and are modeled as a ground water aggregate. Additionally, the ground water rights are grouped to provide a total supply to the ground water only structure. Unlike supplemental wells, ground water only aggregates need to be reflected explicitly in the model as a unique ground water aggregate structure.

  1. Open the response (*.rsp) file in a text editor and include the files specific for well operations.
    • Well_Station (*.wes)
    • Well_Right (*.wer)
    • Well_Demand_Monthly (*.wem)
  2. Open the control (*.ctl) file in a text editor and set the iwell parameter to 1 to indicate that wells will be included in the scenario and set the icondem parameter to 1 to designate the historical demand approach.
  3. Open the network (*.net) in StateDMI, navigate to the appropriate location, and right-click to Add an Upstream Location. Enter the appropriate information and designate the structure type as a well only structure (W).
  4. Recreate the river network file (*.rin) to reflect the additional structure(s).
  5. Create a well station (*.wes) file using the StateDMI commands:
    • Read in W structures from the network diagram.
    • Set the total well capacity in CFS.
    • Set the well system efficiency (annual or monthly efficiency values).
    • Set the demand and use types (see Section 4 for more discussion).
    • Set the idvcow2 parameter to N/A.
    • Set the depletion and return flow locations and patterns; must reference the delay patterns provided in the delay file (*.dly or *.urm).
      • Depletion and accretion locations and patterns are typically the same, unless a portion of non-consumed water returns more quickly via overland flow.
  6. Create a well right (*.wer) file using the StateDMI commands:
    • Use HydroBase to pull well rights for each well or set each well water right; in both situations, tie each water right to the ground water only structure ID.
    • Set the water right priority (administration number) and amount in CFS.
    • Review options to determine if a “turn-on” date is appropriate; note that a “turn-off” date has not been implemented and once a well is turned on, it is available to pump for the remainder of the model period.
  7. Create the well demand file (*.wem) using the TSTool commands.
    • The well demand (*.wem) file reflects the ground water only supply, and is indicated in this file under the ground water structure ID.
    • Set the monthly demand or read in an external StateMod formatted file (*.stm) with the demand.
    • For irrigation demand, the well demand (*.wem) file generally reflects estimated pumping output from StateCU for each ground water only structure. These pumping estimates are generally used for the historical well pumping (*.weh) file for baseflow calculations as well as simulation scenarios.
  8. Simulate the model.
  9. Review the direct diversion summary output file (*.xdd), structure summary output file (*.xss), and the well summary (*.xwe) file for output information on the well structures.