Model Units

The RRCA Groundwater Model uses two basic sets of units.

Model Coordinates

The RRCA Groundwater Model can be located in the real world using a custom projection. The horizontal datum used is the North American Datum of 1927 (NAD27).

Locations in latitude and longitude are projected using the UTM zone 14 projection. UTM coordinates in meters are converted to surveyors feet using the conversion factor 1 meter equals 39.37 inches exactly. The south-west corner of the model is located at 266023 ft east and 14092806 ft north.

Vertical data for the model was derived from the National Elevation Dataset (NED). This dataset uses the North American Vertical Datum of 1988 (NAVD88).

State Input Files

The input to the Republican River Pre-Processor (rrpp) program is a set of cell by cell files for each state. These files specify the volumes and areas of pumping, groundwater and surface water return flows, and canal leakage. All values in these files are volumes in acre-feet for each cell for a particular month. Another set of files specify the surface, groundwater and commingled irrigated acreage. All values in these files are areas in acres per cell for a particular year.
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Directory Structure
Static Files
Precipitation Data Entry
Colorado Data Entry
ET Data Entry
Stream Data Entry
Kansas Data Entry
Nebraska Data Entry
Running the Model