The Existing frame at the bottom of the Point Sources window contains a grid displaying the point sources in the project WDM file. The number of point sources displayed in the grid can be restricted by making selections from the Scenario, Reach, Pollutant, and Facility drop-down list boxes. For example, if “FLOW” is selected from the Pollutant list box then the grid will display only the point sources that have “FLOW” as the Pollutant.
The ‘In Use’ column is used to specify if that point source is in use in the current simulation. When the user sets a point source to ‘In Use’, that point source is added to the External Sources block. WinHSPF will add the appropriate units conversion in the multiplication factor, provided that the daily data in the WDM data set is in the standard BASINS units (lbs/day all constituents except flow, which is in cfs) and that the time step of the run is in hours. Thus the multiplication factor for flow will convert cfs to acre-feet/hour.
The user may wish to edit values in one of the point source data sets. This may be done by highlighting a field in the row associated with the desired data set then clicking on the List/Edit button. The following form will appear: