SWMM56

Subject:    InfoSWMM  ( d / D   v .  Surcharge   d / D ) What is the difference between the output variables  d / D  and  Surcharge   d / D  in  InfoSWMM  and H2OMap  SWMM The  d / D  is calculated as link capacity based on the midpoint depth of water in the link or   Link depth/ Link Maximum Depth             Since the depth in the link is restricted to the Maximum Depth the  d / D  value is always between 0 and 1 The Surcharged  d / D  is calculated from the end node depths at each end of the link             The two node depths are averaged and the value of  Surcharge   d / D  is the  Average Node Depth / Link Maximum Depth , The value of  Surcharge   d / D  varies from 0 to a large number depending on the maximum depths of the nodes...

Subject:   InfoSWMM (d/D v. Surcharge d/D) What is the difference between the output variables d/D and Surcharge d/D in InfoSWMM and H2OMap SWMM The d/D is calculated as link capacity based on the midpoint depth of water in the link or Link depth/ Link Maximum Depth             Since the depth in the link is restricted to the Maximum Depth the d/D value is always between 0 and 1 The Surcharged d/D is calculated from the end node depths at each end of the link             The two node depths are averaged and the value of Surcharge d/D is the Average Node Depth / Link Maximum Depth , The value of Surcharge d/D varies from 0 to a large number depending on the maximum depths of the nodes and the possible surcharge depth of the nodes The value of d/D is based on the middle of the link and the value of Surcharge d/D is based on the average of the node depths at the end of th...