Estimate surface runoff volume and peak flow rate from rainfall
0 m³/s
Calculated using the Rational Method: Q = C × i × A
0 m³
Based on rainfall intensity and duration
0
Based on soil group and land use
0 mm
S = (1000/CN) - 10
0 mm
Q = (P - 0.2S)² / (P + 0.8S)
0 m³
The Rational Method estimates peak discharge for small drainage areas. It assumes:
Applications: Suitable for areas less than 80 hectares (200 acres). Commonly used for urban drainage design.
The SCS Curve Number method estimates runoff from rainfall based on soil type and land use:
Applications: Suitable for both urban and rural areas of any size. Better for complex watersheds.
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