The MODFLOW Gage (GAGE) package allows gaging stations to be added to lakes and SFR stream reaches. A gaging station provides detailed time series data. MODFLOW generates a text file for each GAGE station that is available to be opened from a MODFLOW solution in the Project Explorer. GMS also provides an interface to generate gage plots via the Plot Wizard. A detailed description of the GAGE input is available at the USGS website.
GAGE Package Dialog
Gaging stations can be directly added via the GAGE Package dialog. Stream gages are added in the table at the top using the SFR segment and reach for the desired cell. Lake gages are added in the table at the bottom using the lake ID. A button is also provided to easily add gage stations for all lakes in the model. The OUTTYPE column for both lakes and streams determines the data columns included in the text output.
The OUTTYPE options for SFR streams include:
- 0 – Default values including time, stage, outflow, and solute concentration.
- 1 – Default values plus depth, width, and flow at midpoint.
- 2 – Default values plus streambed conductance for the reach, head difference across streambed, and hydraulic gradient across streambed.
- 3 – Default values plus solute load in stream (if GWT is active).
- 4 – All of the above.
- 5 – Use for diversions to provide a listing of time, stage, flow diverted, maximum assigned diversion rate, flow at end of upstream segment prior to diversion, solute concentration, and solute load.
- 6 – Used for unsaturated flow routing to provide a listing of time, stage, ground-water head, streambed seepage, change in unsaturated storage, and recharge.
- 7 – Used for unsaturated flow routing to provide a listing of time and the unsaturated water content profile beneath the stream. Two profiles are printed. The first is the volume average water content of ISUZN unsaturated cells beneath a stream reach. The second profile is the volume averaged water content beneath the low flow channel only. If ISUZN =1 then both water content profiles will be the same.
The OUTTYPE for lakes include:
- 0 – Default values including time, stage, volume, and concentration.
- 1 – Default values plus all inflows to and outflows from lake (as volumes during time increment), and total lake conductance.
- 2 – Default values plus changes in lake stage, lake volume, and solute concentrations.
- 3 – All of the above except time-step budget error.
GMS – Groundwater Modeling System
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