Figure 1. The Internal Green Ampt Parameters, FUMax, FU and FTOT or
F for a 100 Year SWMM 5 Simulation for Green Ampt Infiltration
Saturday, December 28, 2013
The Internal Green Ampt Parameters, FUMax, FU and FTOT or F for a 100 Year SWMM 5 Simulation for Green Ampt Infiltration
Introduction: This set of blogs uses the 1000 year rainfall/runoff/hydraulics model that you can download at http://swmm2000.com/forum/
topics/1000-year-simulation- with-rainfall-in-swmm-5 to show the inner workings of SWMM 5 and by extension InfoSWMM and H2oMap SWMM using a QA/QC version of SWMM 5 with extended graphics. I always hope that seeing the inner workings of a SWMM 5 feature helps to understand the code, sensitivity and importance of a parameter. It also helps show sometimes when a parameter is not important. In this example, we show some of the internal working of the Green Ampt Infiltration Parameters over the 100 year period.
Discussion: Key internal parameters for Green Ampt infiltration are
FUMax is the Saturated Moisture Content of the Upper Zone (internal units of feet)
F or FTOT in the graph is the Cumulative event infiltration at start of time interval (internal units of feet)
FU is the current moisture content of upper zone (internal units of feet)
As shown in Figure 1, FUMax is constant during the simulation, whereas F and FU vary during the Simulation. These three parameters are used to calculate the IMD during the simulation among other important uses
IMD = [ Maximum Allowable Infiltration – Current Moisture Content of the Upper Zone ] / Depth of the Upper Soil Layer
Or IMD = [ FUMax – FU ] / Depth of the Upper Soil Layer
FUMax = Depth of the Upper Soil Layer * IMDMax
InfoSWMM Version Numbers and the version of Arc Map they use and which EPA SWMM5 Engine is used for Each InfoSWMM Version
InfoSWMM Version Numbers InfoSWMM Version 14.7 Update 3 for Arc Map 10 to 10.8 and Windows 7/8/8.1/10 - EPA SWMM 5.1.014 4/12/2020 ...
Soffit Level ( pipe technology ) The top point of the inside open section of a pipe or box conduit. The soffit is the ...
Engine Error Number Description ERROR 101: memory allocation error. ...
Comment: A really nice water analogy for the field properties Divergence, Curl and Gradient from the Blog Starts With a Bang ....it&...