Safety correction factors

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Safety correction factors for calculating design infiltration rates[1]
Ratio of Mean Measured Infiltration Rates Safety Correction Factor
≤ 1 2.5
1.1 to 4.0 3.5
4.1 to 8.0 4.5
8.1 to 16.0 6.5
16.1 or greater 8.5

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  1. Wisconsin Department of Natural Resources. 2004. Conservation Practice Standards. Site Evaluation for Stormwater Infiltration (1002). Madison, WI.