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depth in partially full pipe equation in excel

depth in partially full pipe equation in excel

depth in partially full pipe equation in excel

(OP)
I see on past discussions taht there is a spreadsheet floating around with an iterative equation for depth of flow in a partially full pipe. Here in Austin we are required to design to 85% full or less for the 100 year. Being from Houston, we always assumed full flow and designed for 2 year storms. can anyone send me a spreadsheet so that I don't have to consult a hydrograph or land desktop.

RE: depth in partially full pipe equation in excel

Here are the equations, solved for a 36" pipe.  Copy all into cell A1 of a new .xls, then pretty it up.

Circular Section Conveyance        
Ratio Full Flow     d/D    
0.00    0.00    
0.10    0.15    
0.25    0.30    
0.35    0.38    
0.50    0.50    
0.65    0.62    
0.75    0.70    
0.85    0.78    
1.00    1.00    

D = Diameter    36    
Ratio Full Flow desired =    0.85    
d/D =    0.78    '=VLOOKUP(B14,A3:B11,2)
d = Flow Depth, ft    0.228    =B13*B15/123
        
A = 0.25D * WP + d - 0.5D * [d(D-d)]^0.5 = Area, sq ft =    0.88    =0.25*(B13/12)*B20+B16-0.5*(B13/12)*(B16*((B13/12)-B16))^0.5
        
WP = 0.5piD + D * Sin[(2d -D) /D] = Wetted Perimeter, ft =    2.46    =0.5*PI()*(B13/12)+(B13/12)*SIN((2*B16-(B13/12))/(B13/12))
        
T = 2 * [d(D-d)]^0.5 = Top Width, ft =    1.59    =2*(B16*((B13/12)-B16))^0.5

Engineering is the practice of the art of science - Steve

RE: depth in partially full pipe equation in excel

(OP)
I think a 3 snuck into your depth of flow calculation. How about converting flows and slopes to depths of flows.

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