Force Main Friction Loss in SWMM 5


Subject:  Force Main Friction Loss in SWMM 5

You can model Force Mains in SWMM 5 using either Darcy Weisbach or Hazen Williams as the full pipe friction loss method (see Figure 1 for the internal defintion of full flow).   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 SWMM 5).  Force Main Friction Loss in SWMM 5.
Figure 1.  How the full pipe condition is defined in SWMM 5











Figure 2:  Friction equations used in SWMM 5 for a Force Main.




Figure 3:  Regions of Friction loss equations in SWMM 5.












Comments

Popular posts from this blog

Soffit Level

SWMM 5 Error Messages

How InfoSWMM and InfoSWMM SA 2D Link and 3D Node Graphics Help You Understand the Response of Your Network to Wet Weather Flow