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SewerGEMS Runoff Volume Calculation Differences

Hi All,

I have what I hope is a simple question about how the volume of runoff for a site modeled in sewergems is calculated. When I run the scenario for the desired storm in SewerGEMS, the calculation executive summary shows that there is a total inflow volume of 13.3 ac-ft into the site (See image 1). However, when I go into the catchment table for the same scenario, and add up the Volume (Total Runoff) column for the catchments, the result is 13.7 ac-ft. If my interpretation of these two calculations is correct, then it looks like the model is saying that more runoff is leaving the site than stormwater that entered the site (which doesn't make sense to me). If I could have someone explain to me what is happening here that would be very helpful. Thanks!