Pre 2014 Blogs

SWMM 5 Slope Rules

Posted by Robert Dickinson on January 20, 2011 at 6:50pm
Note: SWMM 5 Slope Rules

The relationship between the upstream and downstream node invert and offset elevations, the input conduit length and the slope used in the SWMM 5 simulation are shown in Figure 1.
Figure 1.  Slope, length and elevation drop relationship relationships in SWMM 5.
Tags: -swmm-5-slope-rules
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  • Robert Dickinson January 31, 2011 at 2:05pm

    I will leave out the boxes this time and you can see the code at the bottom of this email

     

    1. 1.       Let          E1 = Upstream Link Offset + Upstream Node Invert Elevation

                                     E2 = Downstream Link Offset + Downstream Node Invert Elevation

     

    1. 2.       Compute the Link Drop = | E1 – E2 |

     

    1. 3.       Check on the Drop compared to the Minimum Drop = if the Drop is less than the Minimum Drop then the Drop is set equal to the Minimum Drop

     

    1. 4.       The Drop cannot exceed the User Input Length – if it is then the Slope = Drop / Length

     

    1. 5.       The Slope equals the Drop over the Horizontal Distance if the Drop is less than the Length – this is the

     

     

     

    1. 6.       If E2 > E1 then the Pipe is Adverse and the Slope is Negative

     

    

    
            
    
            
    
        
    
    
    
        
      
        
    

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