ABCDEFGHIJKLMNOPQRSTUVWXYZ
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Estimate of effective precipitation (event flow) and peak flow using the NRCS curve method: Yellow shaded cells require input data
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Conventional method (area-weighted average curve number)
Alternate Method (sum volumes from each area)
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VariableValueUnitsLand cover descriptionHydrologic condition (if applicable)Soil groupUnadjusted curve numberAntecedent conditionAdjusted curve numberArea of coverPercent coverFraction coverWeighted curve numberMaximum storage capacityInitial abstractionTotal volume of event flow
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{poor, fair, good}{A-D}(-)(I,II,III)(-)[mi2](%)(-)(-)(in)(in)(in)(in3)
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Estimate event flow (or effective rainfall)
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Total rainfall volume (area normalized)
in
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Weighted average curve number-
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Maximum storage capacityin
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Initial Abstractionin
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Total volume of event flowin
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Runoff ratio-
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Estimate peak flow (assuming triangular hydrograph)
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Flow lengthft
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Average land slope%
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Duration of rainfallhr
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Watershed areami2
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Time of concentrationhr
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Time of risehr
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Peak event flow
ft3 sec-1
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Totals
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inputs
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Alternate method (sum volumes from each area)
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Total volume of event flowin3
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(area normalized)in
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Runoff ratio-
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