H2OMAP SWMM

High and Low Estimates of ICM Subcatchment Dimension for SWMM Hydrology

High and Low Estimates of 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).

 

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

132.00

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

1320.00

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

13200.00

330,000.00

 

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

 

 

Figure 2  InfoSWMM Subcatchment Manager Width Estimator.

via Blogger http://www.swmm5.net/2013/08/high-and-low-estimates-of-icm.html

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