How Does the Green Ampt Initial Moisture Deficit Work in SWMM 5?

Subject:   How Does the Green Ampt Initial Moisture Deficit Work in SWMM 5?

How Does the Green Ampt Initial Moisture Defiict Work in InfoSWMM and SWMM 5? by dickinsonre Subject:   How Does the Green Ampt Initial Moisture Defiict Work in InfoSWMM and SWMM 5? This graph shows the values of the internal SWMM 5 parameters for Green Ampt Infiltration for the pervious area of a Subcatchment during a simulation.  The parameters are: ·         Soil Moisture = IMD Max – (FUMax – FU)/Upper Soil Zone Depth ·         FU or current moisture content of the upper zone of the of the soil ·         FUMax which is the saturated moisture content of the upper zone in feet and stays constant during the simulation ·         IMD Max is the user defined Initial soil moisture deficit and is a fraction Figure 1.  How Soil Moisture changes over time. Figure 2.  Soil Moisture and IMD are related – the Soil Moisture has a maximum of IMDMax. via Blogger http://www.swmm5.net/2013/08/how-does-green-ampt-initial-moisture.html