Qfull in #SWMM5 and #INFOSWMM for various levels of y/yFull in a Circular Pipe




Subject:  Qfull in SWMM 5 for various levels of y/yFull in a Circular Pipe 


Here is a table that shows the value of Q/Qfull for various levels of y/yFull or d/D in SWMM5.  The full flow if you loop off the top of a circular pipe at the 0.83 level would be about 1.01 times Qfull for the whole pipe. Figure 1 shows how the flows are calculated at various values, Table 1 and Figure 2 show the values of a/aFull, r/rFull and q/qFull for various values of y/yFull. 

Figure 2:  A/Afull vs y/Yfull for a circular pipe
Table 1.   Table  of y/yFull and Q/Qfull based on a/aFull and r/rFull

y/yFull
a/aFull
r/rFull
Q/qFull
0.00000
0.00000
0.01000
0.00000
0.02000
0.00471
0.05280
0.00066
0.04000
0.01340
0.10480
0.00298
0.06000
0.02445
0.15560
0.00707
0.08000
0.03740
0.20520
0.01301
0.10000
0.05208
0.25400
0.02089
0.12000
0.06800
0.30160
0.03058
0.14000
0.08505
0.34840
0.04211
0.16000
0.10330
0.39440
0.05556
0.18000
0.12236
0.43880
0.07066
0.20000
0.14230
0.48240
0.08753
0.22000
0.16310
0.52480
0.10612
0.24000
0.18450
0.56640
0.12630
0.26000
0.20665
0.60640
0.14805
0.28000
0.22920
0.64560
0.17121
0.30000
0.25236
0.68360
0.19583
0.32000
0.27590
0.72040
0.22172
0.34000
0.29985
0.75640
0.24893
0.36000
0.32420
0.79120
0.27733
0.38000
0.34874
0.82440
0.30662
0.40000
0.37360
0.85680
0.33702
0.42000
0.39878
0.88800
0.36842
0.44000
0.42370
0.91760

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