Pre 2014 Blogs

RDII Initial Abstraction in SWMM 5

Posted by Robert Dickinson on July 31, 2011 at 8:03pm

Subject: RDII Initial Abstraction in SWMM 5

The initial abstraction in each of the three components of RDII in SWMM 5 are updated at each time step. The initial abstraction (ia) is:

ia = iaMax - iaUsed

based on the maximum amount of ia, the ia used (iaUsed), the recovery rate (iaRecov) and the month and class of RDII. You can enter a value for iaMax, iaInit and iaRecov for each month.

The iaUsed at the beginning of the simulation is set equal to iaInit

and if there is no rainfall

-rdii-initial-abstraction-in-swmm-5

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