In applications where the rainfall is important for the flow, you can include precipitation in your simulation. This is done either as a constant value or as a time series (type 0 data file), which then is applied to the entire model area, or as a time series of maps (type 2 data file) in which case each grid point is assigned its own value. The precipitation rate is specified in mm/day. You can use the Time Series Editor or the Grid Editor tool to create your precipitation data.
You can also use the precipitation facility to include evaporation in your simulation. This is simply done by selecting the “included as net-precipitation” option and specifying a negative precipitation.
The precipitation rate is specified in the Source and Sink (p. 57) dialog.