Sunday, February 23, 2014

Tip for The Ponding Allowed Option in SWMM 5

Tip for The Ponding Allowed Option in SWMM 5

Normally, it is better to have smaller ponding allowed area in SWMM 5 due to considerations outlined in this earlier blog and 2nd Blog but if you have a low lying area with ponding allowed it is better if you have a larger ponding area so that the depth above the rim elevation of the node is small and you do not set up reverse  flow and cause flooding at other modes due to the  higher HGL.  Figure 1 illustrates a typical HGL profile and Figure 2 shows the better flooding  graphs as you increase the ponding surface area for the low lying node.

Figure 1.  HGL around a low Lying Node


Figure 2.  Smoother Flooding Graph due to Higher Surface Ponding Area


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InfoSWMM Version Numbers and the version of Arc Map they use and which EPA SWMM5 Engine is used for Each InfoSWMM Version

 InfoSWMM Version Numbers  InfoSWMM Version 14.7  Update 3 for Arc Map 10 to 10.8 and Windows 7/8/8.1/10 - EPA SWMM 5.1.014   4/12/2020   ...