SWMM5 - Stormwater Management Model
SWMM 5, Watersheds, Water Quality,Hydrology, Hydraulics - Watersheds
SWMM 5 Variable Time Step
SWMM 5 Variable Time Step
In the SWMM 5 Simulation Options/Dynamic Wave Options is the Variable Time Step Frame which contains the Adjustment Factor Percentage. The Adjustment Factor is a multiplication factor for the Courant-Friedrichs-Lewy (CFL) condition.
Plot of time step in conjunction with Total Inflow
The effiect of changing the Adjustment factor can be seen in the following graph. As the value of the adjustment factor changes from 75 to 50 to 25 the time step used in the program decreases because the time step gets further away from the CFL time step condition.
Last updated by Robert E Dickinson Dec. 25, 2008.
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You should still adjust the width individually for each subcatchment but compare the peak flows for the combined flows to your monitored data. Unless you want to model S1, S2 and S3 together then you are best off estimating the width for each subcat…
Thank you for your help. However, the flow measurement was only taken at the outlet of the whole catchment (Out 1). if i want to calibrate the runoff quantity, how can i obtain the width of the whole catchment? Am i combine the total width of subcat…
Originally, when SWMM was developed the width parameter was the collection length of the subcatchment. For example, it would be the gutter length on a street going to an inlet. In your case one easy way to estimate the Width for the subcatchment goi…
Hello,I am not familiar on using SWMM for quantity and quality modeling. i need some helps here.I have a problem on calibrating the total width of catchment in SWMM quantity modeling. Figure shown below is my studied catchment. the surface runoff is…
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