The value of d/D
in InfoSWMM is calculated as Link capacity or the Midpoint Capacity
Whereas the Surcharged
d/D is calculated from the end node depths or
Surcharged d/D = Average depth in the middle of
a link or ½ (Upstream Depth + Downstream Depth) / Maximum depth
Midpoint Capacity = the midpoint cross sectional
area (based on the average depth) / the full cross sectional area
If you look at the
reports d/D or Midpoint Capacity is not
quite the same as the Surcharged d/D which is based on the upstream and downstream
depths and not the Capacity (a function of Area). I hope this explains why Surcharged d/D
is equal to the Depth and not the same as the d/D or Midpoint Capacity.
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| Inverse Color Attribute Browser in InfoSWMM and H2OMap SWMM showing various output data. |
