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.
- 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)
- Open the control (*.ctl) file in a text editor and set the
iwellparameter to 1 to indicate that wells will be included in the scenario and set the
icondemparameter to 1 to designate the historical demand approach.
- 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).
- Recreate the river network file (*.rin) to reflect the additional structure(s).
- 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
idvcow2parameter 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.
- 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.
- 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.
- Simulate the model.
- 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.