Huff Flow Calculator
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Exemption Analysis
Data Lookup
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Based on ISWS Bulletin 75
Quick Exemption Analysis
Project Information
Project Name
Prepared By
Design Storm
Return Period
2-year
5-year
10-year
25-year
50-year
100-year
Duration
1 hour
2 hours
3 hours
6 hours
12 hours
24 hours
Rainfall Depth (inches)
Auto-populated from Bulletin 75
Existing Conditions
(Soil Group B)
Select land cover...
ac
Add Land Cover
Composite CN
Total Area (ac)
Time of Concentration (minutes)
Calc
Proposed Conditions
(Soil Group D - Conservative)
Select land cover...
ac
Add Land Cover
Composite CN
Total Area (ac)
Time of Concentration (minutes)
Calc
Receiving System
Pipe
(1.0 CFS threshold)
Swale
(2.5 CFS threshold)
Run Analysis
Load Example
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New Analysis
Time of Concentration Calculator
Kerby-Kirpich Method
Overland Flow (Kerby)
Length (ft)
Slope (ft/ft)
Roughness (n)
Channel Flow (Kirpich)
Length (ft)
Slope (ft/ft)
Calculated Tc:
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minutes