High and Low Estimates of InfoSWMM/ICM Subcatchment Dimension for SWMM Hydrology

High and Low Estimates of InfoSWMM/ICM Subcatchment Dimension for SWMM Hydrology

These are the estimates for both SWMM 5, InfoSWMM and ICM SWMM Hydrology, the low estimate is 0.2*SQRT(Area in Feet) and the High Estimate is 5*SQRT(Area in Feet), Figure 1.  You can use higher or lower numbers to calibrate to monitored data but these are just guidelines using the InfoSWMM Subcatchment Manager Width Tool (Figure 2).

Table 1.  High and Low Estimates of the ICM Subcatchment Dimension for SWMM Hydrology or the SWMM 5 Subcatchment Width.


Subcatchment Area
 (Acres)
Low Estimate  Width (Feet),
W = 0.2*SQRT(Area)
High Estimate  Width (Feet),
W =5*SQRT(Area)
1
41.74
1,043.55
5
93.34
2,333.45
10
132
3,300.00
25
208.71
5,217.76
50
295.16
7,379.02
100
417.42
10,435.52
200
590.32
14,758.05
300
722.99
18,074.84
400
834.84
20,871.03
500
933.38
23,334.52
600
1022.47
25,561.69
700
1104.39
27,609.78
800
1180.64
29,516.10
900
1252.26
31,306.55
1,000
1320
33,000.00
5,000
2951.61
73,790.24
10,000
4174.21
104,355.16
50,000
9333.81
233,345.24
100,000
13200
330,000.00

Figure 1  InfoSWMM Subcatchment Manager Width Estimator.

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