Global Watershed + TR-55

Latitude Longitude

Rainfall inputs

Units: mm

Rainfall type

Annual average rainfall

Used as Annual/12 to represent an average month.

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Choose one mode above. Others are ignored.

TR-55 parameters

CN (table): —

Hydrologic Soil Group Land Use / Cover

Peak discharge (Rational)

Tc (Kirpich): —

Drainage area A (km²) Rainfall intensity i

Time of concentration Tc (min) Auto-estimate Tc via Kirpich

Slope %

Auto-slope from DEM (Open-Elevation) —

Kirpich (SI): T_c=0.01947·L^0.77·S^−0.385, where L (m) is upstream flow length, S is slope in m/m (so 1% = 0.01).
Rational (SI): Q_peak = 0.278 · C · i · A, A in km², i in mm/hr, Q in m³/s. Here C = Q/P from TR-55 event runoff.

Results

Area (km²)

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Upstream length (km)

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Slope (%)

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T_c (min)

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Rainfall P

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Retention S

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Initial abstraction Ia

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Runoff Q

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Runoff coeff C=Q/P

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Volume

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Q_peak (m³/s)

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