#INFOSWMM

RDII Initial Abstraction in SWMM 5


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 initialabstraction (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

 

 

 

via Blogger http://www.swmm5.net/2013/08/rdii-initial-abstraction-in-swmm-5.html

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