Tuesday, November 15, 2011

Qfull in SWMM 5 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 1.   How Qfull and Qmax are calculated in  SWMM 5 based on the roughness, slope and a lookup table for area and hydraulic radius for a circular pipe.



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
0.40009
Table 1.   Table  of y/yFull and Q/Qfull based on a/aFull and r/rFull


Figure 2.   Graph of values in Table 1

No comments:

HOW TO USE GIS GATEWAY IN INFOSWMM TO CREATE BOTH DATA AND MODEL RESULTS SHAPEFILES

  GIS Gateway – Create Shapefile T he Create Shapefile tool available from the  GIS Gateway , allows you to create a new ESRI® Shapefile dir...