Following is the appearance of the Point Sources tab of the Reservoir Coefficients dialog:
Following is a description of the parameters associated with Point Sources. Refer to the main Reservoir Coefficients page for information on other categories of coefficients. To save the changes made when closing this dialog, click OK. To ignore changes, click Cancel.
When Point Sources is clicked, the dialog shows a list of the point source dischargers to a reservoir segment. The effluent data for each discharger is stored in a separate file with a PTS extension. A reservoir segment can accept multiple point source discharges. To add a file to the list, click on the Add button and select the file to add. To remove a file from the list, click on it and click the Remove button.
After selecting a point source file from the list, a number of options will activate below. Following is a description of these options:
Internal means that the water for the point source is taken from this reservoir segment and then returned.
External means that the water for the point source is introduced to the reservoir from an outside source.
Zero means that the loading for all constituents not listed in the data file is assumed to be zero. This option is required for external sources.
Ambient means that the loading for all constituents not listed in the data is assumed to be the same as the reservoir concentrations. This option is required with internal water sources.
Outlet Elevation is the elevation (m above mean sea level) of the reservoir outlet which is the source of water for an internal water source.
Outlet Width is the width (>0 m) of the which is the source of water for an internal water source.
Point source load from a sewage treatment plant or an industrial facility is from an external source. A thermal discharge, on the other hand, is from an internal source because the power plant withdraws water from a reservoir layer within the basin, adds heat or other chemical constituents, and discharges it. For an internal source discharge, the line underneath the list changes to “Specify changes in temperature and loading added”. In other words, the numbers in the point source file represent the load increase to the temperature and other water quality constituents. “Reservoir ambient” should be selected for an internal point source so that the loading for the unspecified constituents is the same as the reservoir layer from which the water was drawn. For external point sources, the actual temperature and loading of the point source is specified in the data file. For external sources, “Zero” should be selected under unspecified constituents.
When the Apply Changes To Selected button is checked, changes made to the coefficients of the reservoir segment being edited will be made to all selected reservoir segments. When the Apply Changes To All button is checked, changes made to the coefficients of the reservoir segment being edited will be made to all reservoir segments.