Saturday, March 18, 2017

Six Depth and Flow Processes in #SWMM5

This is a backup post to go with the EPA hydrology manual (Manual I) which can download in PDF format here

There are three runoff surfaces on a SWMM5 Subcatchment: Impervious with depression storage, Impervious without depression storage and pervious area with depression storage (Figure 1).  The depression storage can be zero in all cases.
Figure 1.  Three Runoff Areas for Subcatchments in SWMM5
You can see the flow from all three areas (Figure 2).  If you look at the following graph the flow in the impervious and pervious area with depression storage is delayed as the depth in the area has to increase enough to reach the depression storage as you can see in Figure 3-2 from the EPA Manual.
Figure 2. Graphs of Three Runoff Surfaces or Areas + Total Runoff
You can see the depth from all three areas (Figure 3).  If you look at the following graph the flow in the impervious and pervious area with depression storage is greater than the depth in the impervious area with depression storage as the runoff commences right away in the area without depression storage.

Figure 3. Graphs of Three Runoff Surfaces or Areas

In Figure 4 you can see the Runoff from the Pervious area does not occur until the depth in the pervious area is greater than the depression storage of 1 inches.

Figure 4.  Depth in the Pervious Area (right axis) versus flow in the pervious area (left axis)

Saturday, March 4, 2017


The following is based on the readme.txt for compiling that EPA distributes with the SWMM5 install

1. Open the file swmm5.c in a text editor and make sure that the
   compiler directives at the top of the file read as follows:
       //#define CLE
       //#define SOL
       #define DLL   or the DLL will be created

2. Create a sub-directory named VC2010_DLL under the directory where
   the SWMM 5 Engine source code files are stored and copy SWMM5.DEF
   and VC2010-DLL.VCPROJ to it.

3. Launch Visual C++ 2010 and use the File / Open command to open
   the VC2010-DLL.VCPROJ file.

4. Issue the Build >> Configuration Manager command and select the
   Release configuration.

5. Issue the Build VC2010-DLL command to build SWMM5.DLL
   (which will appear in the Release subdirectory underneath the
   VC2010-DLL directory).

NOTE: The VC-2010 project file includes Open MP support which is
      only available with the Professional and higher versions of
      the compiler.

A SmartArt view of the process

How it looks in the Windows directory


Arbitrary Windows directory name with a Subfolder of the SWMM 5 engine followed by a Subfolder called VC2010_DLL with files SWMM5.DEF
   and VC2010-DLL.VCPROJ

How it looks in Visual Studio 2012

And here is how it compiles right away
1>  Generating Code...
1>  Compiling...
1>  shape.c
1>  snow.c
1>  stats.c
1>  statsrpt.c
1>  subcatch.c
1>  surfqual.c
1>  swmm5.c
1>  table.c
1>  toposort.c
1>  transect.c
1>  treatmnt.c
1>  xsect.c
1>  Generating Code...
1>     Creating library C:\SWMMandSoftware\VisualStudioSWMM5\swmm51010_engine\VC2010_DLL\Debug\VC2010-DLL.lib and object C:\SWMMandSoftware\VisualStudioSWMM5\swmm51010_engine\VC2010_DLL\Debug\VC2010-DLL.exp
1>  VC2010-DLL.vcxproj -> C:\SWMMandSoftware\VisualStudioSWMM5\swmm51010_engine\VC2010_DLL\Debug\VC2010-DLL.dll
========== Build: 1 succeeded, 0 failed, 0 up-to-date, 0 skipped ==========

If you want the Release version use Build/Release

Note on April 28, 2017 - I am including a link to a zip file of a working directory in VS 2012 and the directory C:\SWMMandSoftware\swmm51012_engine
You can download the entire directory (working using this link)

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