The output text file will say what the maximum depth is, 4 feet in this case. For item 1: Your equation is computing the Percent Impervious Area that goes into the Subcatchment Property Editor based on the acres (or hectares) of impervious area, total subcatchment area and area devoted just to LID controls (i.e., area taken up by your rain barrels area of a barrel ( 1 sq m) 3750 barrels). This is an internal engine change and is reflected in the Output HGL.įor example, if a 4 foot pipe is connected to a node with a maximum depth of 2 feet, the node's maximum depth will be increased to 4 feet. If the crown elevation of the highest connecting link is greater than the maximum depth of the node, then the maximum depth of the node is increased to the crown elevation of highest connecting link. WARNING 02: maximum depth increased for Node - What Does this Message Mean? You should not have to worry about this warning message. It simply is a rule that does not allow flat slopes as the flat slopes mean no normal flow calculations. If it is not then SWMM 5 will use the minimum drop or 0.001 /3.048 meters Internally Elevation1 – Elevation2 should be greater than 0.001 /3.048 meters. This message means that the elevation drop across the link is less than the minimum allowable drop or (0.001 /3.048 meters)Įlevation1 = Link Offset Upstream + Upstream Node InvertĮlevation2 = Link Offset Downstream + Downstream Node Invert WARNING 04: minimum elevation drop used for Conduit – What Does this Message Mean? If you use the Dynamic Wave option you need to have an outfall, Please add an outfall or use the Kinematic Wave option Hydraulic Design of an Overland Flow Distribution System Using Lateral Weirs by Victor M.
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