**Introduction:**This set of blogs uses the 1000 year rainfall/runoff/hydraulics model that you can download at

**http://swmm2000.com/forum/topics/1000-year-simulation-with-rainfall-in-swmm-5 to show the inner workings of SWMM 5 and by extension InfoSWMM and H2oMap SWMM using a QA/QC version of SWMM 5 with extended graphics. I always hope that seeing the inner workings of a SWMM 5 feature helps to understand the code, sensitivity and importance of a parameter. It also helps show sometimes when a parameter is not important. In this example, the components of the total losses in SWMM 5 which are the infiltration from the pervious area and the evaporation from the impervious and pervious area are shown (Figure 1)**

**Discussion:**The total losses (Figure 1) are:

__1. ____The infiltration only losses from the pervious area,____2. ____Evaporation losses from the pervious and impervious area weighted by areal coverage____3. ____The total losses which are the sum of the evaporation plus infiltration losses__

__a.__

__In a continuous simulation the times of infiltration only loss is less than the total losses due to the times when evaporation only is occurring from the depression storage of the Subcatchment__

__b.__

__The Statistics assume an inter-event time of 0 hours to capture all of the one hour saved time increments__

Figure 1. The total losses include both evaporation and infiltration for a 100 Year SWMM 5 Simulation |

via Blogger http://www.swmm5.net/2013/12/the-total-losses-include-both.html