Fix Calculation of Summary Loads

[rajadain]

BME noticed that the MapShed Summary Loads were not being calculated correctly. The Detail / Per Land Use loads are calculated correctly.

According to him, it seems like the Total Loads is missing the Low-Density Open Space land use type. This may affect the Loading Rates number as well. Furthermore, it seems like the denominator when calculating Loading Rates includes Open Water, which reduces the final number. Loading Rates should be calculated only for land, thus Open Water should be excluded. Loading Rates should be calculated for the entire area, including Open Water.

BME will send over the name of a test watershed and the numbers he expects to see. They will be attached thence herein.

[rajadain]

From BME:

Thanks for meeting today. FYI, the HUC12 sub-watershed I used for my example is "City of Gahanna-Big Walnut Creek". The sediment loads calculated when you run the multi-year model now are 1,898,674.2 (for total load) and 598.99 (for loading rate). As discussed, however, they should be 1,910,294.3 and 471.68, respectively. Again, as discussed, the load for "Developed Open Space" needs to be added to the total load. Also, the area for "Water" needs to be subtracted, and the area for "Developed Open Space" needs to be added prior to doing the loading rate calculation (i.e., total kg / hectares of land area).

[rajadain]

He sent over this file to better help explain the issue: MMWLoadFixes.xlsx