Herr Output is created by postprocessing several WARMF output files to determine the sources of flow and loading at the downstream end of a river reach for each day of the simulation. The figure below shows the Herr Output for total dissolved solids.
The colored lines at the bottom of the graph represent each of the listed loading sources on the right. The sources tabulated by the Herr Output include all the river tributary inflows, inflows from catchments, point sources, and agricultural drains between the upstream and downstream ends of the river reach specified under the Setup tab.
The solid black line is the total loading at the downstream end of the river reach being analyzed. The sum of the loading sources in the Herr Output should be approximately equal to the total loading shown by the thick black line. A small amount of error, less than 5%, is typical. In the initial part of the simulation, the Herr Output cannot account for all the sources because of the travel time required for some sources to reach the downstream end of the reach.
A red dashed line shows the assimilative capacity if there is a water quality criterion for the selected parameter at the downstream end of the reach. If the total load is less than the assimilative capacity, then loading to the river could be increased without violating the water quality criterion. If the loading exceeds the assimilative capacity, the magnitude of each of the loading sources provides guidance on where loading reductions might be effective at improving the water quality to meet the criterion. Click on the Export button to put the Herr Output in a comma delimited text file for further analysis.