SWMM56

------------------------ Build 5.1.010 (08/05/15) ------------------------- Source Engine Updates: 1. A modified version of Green-Ampt infiltration (MODIFIED GREEN AMPT) was added that no longer redistributes upper zone moisture deficit during low rainfall events. The original authors of SWMM's Green-Ampt model have endorsed this modified version. It will produce more infiltration for storm events that begin with low rainfall intensities, such as the SCS design storm distributions. 2. A new type of weir, a ROADWAY weir, has been added. It models roadway overtopping using the FHWA HDS-5 method and would typically be used in parallel with a culvert conduit. 3. Rule premises can now test whether a link has been open (or closed) for a specific period of time. See the Help file for more details. 4. Unsaturated hydraulic conductivity ("K") was added to the list of variables that can be used in a user-supplied groundwater flow equation. 5...

Storm Water Management Model   From Wikipedia, the free encyclopedia The  United States Environmental Protection Agency  (EPA)  Storm Water Management Model  (SWMM) [ 1 ] [ 2 ] [ 3 ] [ 4 ] [ 5 ] [ 6 ] [ 7 ]  is a dynamic rainfall– runoff – subsurface runoff   simulation model  used for single-event to long-term (continuous)  simulation of the surface/subsurface hydrology quantity and  quality  from primarily urban/suburban areas. The hydrology component of SWMM operates on a collection of  subcatchment areas  divided into  impervious  and  pervious  areas with and without  depression  storage to predict  runoff  and  pollutant  loads from precipitation, evaporation and  infiltration losses from each of the subcatchment. In addition low impact development (LID) and best management practice areas on the subcatchment can be modeled to reduce the impervious and pervious ru...