H2OMAP SWMM

EPA SWMM Build 5.1.007 (9/15/2014) with New Feature Images

SWMM 5.1 Update History
=======================
Engine Updates, more information and code shown on the EPA Website:
1.   A new feature that provides monthly adjustments for
     temperature, evaporation rate, and rainfall was added.

2.   Support for reading the new GHCN-Daily climate data
     files available from NCDC’s Climate Data Online service
     was added.
3.   In addition to lateral groundwater flow, a custom
     equation can now also be used for seepage flow to
     a deeper groundwater aquifer.

4.   The [GW_FLOW] section of the project file was renamed
     to [GWF] and its format was changed to accommodate
     both lateral and deep groundwater flow equations.
5.   A new Weir parameter was added that specifies if the
     weir can surcharge using an orifice equation or not.
     Surcharging was the only option in SWMM 5.0 but was
     switched to no surcharging in earlier 5.1 releases.
     This new parameter accommodates both closed top weirs
     that can surcharge and open channel weirs that cannot.

6.   The formula used to recover infiltration capacity during
     dry periods for the Modified Horton method was revised.
7.   The initial cumulative infiltration into the upper soil
     zone for Green-Ampt infiltration had been incorrectly
     set to the maximum value instead of zero.
8.   All of the Green-Ampt infiltration functions were
     re-factored to make the code easier to follow.
9.   The calculation of infiltration out of the bottom of a
     Bio-Retention Cell or Permeable Pavement LID unit with a
     zero-depth storage layer was corrected.
10.  Most of the LID simulation routines were modified to
     provide more accurate results under flooded conditions.
11.  Results written to the detailed LID results report now
     always correspond to a full reporting time step.
12.  The name of the variable used to represent the height of
     the receiving channel bottom in a user-defined groundwater
     flow equation was corrected to match the name displayed
     in the GUI’s Groundwater Editor dialog (Hcb).
13.  A problem with the program crashing when a climate file
     was used to provide evaporation rates for open channels
     and storage nodes when runoff was not computed (as when
     there were no subcatchments in the project) was fixed.
14.  Flow and pollutant routing mass balance accounting was
     modified to correctly handle negative external inflows.
15.  The procedure for computing the area available for seepage
     out of a storage node that has a tabular storage curve was
     corrected.
16.  Seepage from storage units can now be modeled using Green-
     Ampt infiltration, which makes the seepage rate a function
     of storage level. The constant seepage rate option can
     still be used by setting the G-A initial moisture deficit
     to 0.

17.  The function that finds depth as a function of volume from
     a storage curve was corrected for the case where the depth
     falls within a portion of the curve where area is constant
     with depth (i.e., vertical side walls).
GUI Updates:
1.   The Object Toolbar was restored.

2.   A new page was added to the Climatology Editor to edit
     values for monthly adjustments for temperature, evaporation,
     and rainfall.
3.   A field for the new weir surcharge option was added to the
     Weir Property editor.
4.   A problem with the current project being closed without
     asking if it should be saved first whenever a new style
     theme was selected from the Program Preferences dialog
     has been fixed.
5.   The default seepage rate from an LID storage layer was changed.
6.   The Infiltration Editor was restored for editing Green-Ampt
     parameters for storage unit seepage loss.
7.   The Groundwater Flow Equation Editor was extended to accept

     equations for deep groundwater flow.

History of EPA SWMM versions (from Wikipedia)


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