Rainfall Runoff (Rational Method)
Drainage IS 10430:1982~2 min
Calculate peak storm runoff using the Rational Method for drainage design.
Formula
Q = C × I × A / 360
Input Parameters
Paved=0.9, Lawn=0.3, Residential=0.5
Results
Peak Runoff (Q)
0.486m³/s
Peak Runoff
486.1L/s
Step-by-Step Method
- 1Determine runoff coefficient C based on land use.
- 2Obtain design rainfall intensity I (mm/hr) for the design return period.
- 3Measure catchment area A in hectares.
- 4Q = C × I × A / 360 (m³/s).
Engineering Notes
- •C = 0.9 for paved surfaces, 0.3 for lawns, 0.5 for residential areas.
- •Rational method is suitable for areas < 50 ha.
Code Reference
IS 10430:1982
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