If you want the SWMM 5 groundwater Subcatchment routing to use the the aquifer water table elevation, the node invert elevation and the depth of water in the receiving water node then you should use values of 0, blank and blank for Surface Water Height, Channel Bottom Height and Water Table Elevation, respectively (Figure 1). As shown in Figure 2, if the Groundwater starts out at the same elevation as the receiving water node the flow can be both negative and positive into the groundwater comparatments as the depth in the node and the infiltration for the Subcatchment change.
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| Figure 1. SWMM5 Groundwater Elevations |
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| Figure 2. SWMM 5 Groundwater and Node Elevation Relationship Options |
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