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The runoff calculation formula estimates surface water runoff from rainfall in very hilly, steep catchments with hardly any cultivation and continuous downpour conditions. The formula uses a coefficient of 0.81 to account for the specific catchment characteristics.
The calculator uses the runoff equation:
Where:
Explanation: The formula calculates the amount of surface water runoff based on rainfall input, considering the specific terrain and land use characteristics.
Details: Accurate runoff estimation is crucial for water resource management, flood prediction, irrigation planning, and environmental impact assessment in hilly and steep catchment areas.
Tips: Enter rainfall value in centimeters. The value must be valid (rainfall > 0). The calculator will compute the corresponding runoff based on the specific catchment characteristics.
Q1: Why is the coefficient 0.81 used for this calculation?
A: The coefficient 0.81 is specifically derived for very hilly, steep catchments with hardly any cultivation and continuous downpour conditions, accounting for the high runoff potential in such terrain.
Q2: How does terrain affect runoff coefficients?
A: Steeper terrain with minimal vegetation typically has higher runoff coefficients due to reduced infiltration and increased surface flow velocity.
Q3: What are typical runoff values for different terrains?
A: Runoff coefficients vary significantly based on slope, soil type, vegetation cover, and rainfall intensity, ranging from 0.1-0.3 for flat cultivated areas to 0.8-0.9 for steep, impervious surfaces.
Q4: When should this specific formula be used?
A: This formula should be used specifically for very hilly, steep catchments with hardly any cultivation and continuous downpour conditions as described.
Q5: Are there limitations to this equation?
A: This equation is specific to the described catchment conditions and may not be accurate for different terrain types, soil conditions, or rainfall patterns.