SWMM56

Subject:   Force Main Friction Loss in InfoSWMM and the Transition from Partial to Full Flow You can model Force Main friction loss in InfoSWMM using either Darcy Weisbach or Hazen Williams as the full pipe friction loss method (see Figure 1 for the internal definition of full flow).   A function called ForceMain in InfoSWMM whose purpose is to compute the Darcy-Weisbach friction factor for a force main using the  Swamee and Jain approximation to the Colebrook-White equation .  No matter which method you use for full flow the  program will use Manning's equation to calculate the loss in the link when the link is not full (see Figure 2 for the equations used for calculating the friction loss – variable dq1 in the St Venant equation for InfoSWMM).    The regions for the different friction loss equations are shown in Figure 3.      There is no slot in InfoSWMM for the full pipe flow as a surcharged node in InfoSWMM uses this point...

Force Main Friction Loss in InfoSWMM and the Transition from Partial to Full Flow by  dickinsonre Subject:   Force Main Friction Loss in InfoSWMM and the Transition from Partial to Full Flow You can model Force Main friction loss in InfoSWMM using either Darcy Weisbach or Hazen Williams as the full pipe friction loss method (see Figure 1 for the internal definition of full flow).   A  function called ForceMain in InfoSWMM whose purpose is to compute the Darcy-Weisbach friction factor for a force main using the  Swamee and Jain approximation to the Colebrook-White equation  .   No matter which method you use for full flow the  program will use Manning's equation to calculate the loss in the link when the link is not full (see Figure 2 for the equations used for calculating the friction loss – variable dq1 in the St Venant equation for InfoSWMM).    The regions for the different friction loss equations are shown in Figu...