Thursday, August 8, 2013
How is Capillary Suction Head Used in SWMM 5 Green-Ampt?
Subject: How is Capillary Suction Head Used in SWMM 5 Green-Ampt?
How sensitive is the infiltration loss and rate to the capillary suction head parameter in the SWMM 5 Green-Ampt infiltration method. Figure 1 shows how the total infiltration loss and total loss rate vary as you change the suction head from 12 to 6 to 3 inches. Internally the suction head is used in infil.c of SWMM 5 by adding the suction head to the ponded water on the pervious area in the parameter c1 of the implicit Green-Ampt SWMM5 solution.
C1 = (Suction Head + Depth of Ponded Water) * IMD or Initial Moisture Deficit
Figure 1. The sensitivity of the total infiltration loss to the capillary suction head in a continuous simulation
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