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Drainage Area Formula:
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Drainage Area calculation determines the total surface area where rainwater flows over the ground surface rather than being absorbed into the ground. This calculation is essential for hydrological studies and civil engineering projects.
The calculator uses the drainage area formula:
Where:
Explanation: The formula calculates the drainage area by dividing the peak discharge by the product of rainfall intensity and runoff coefficient.
Details: Accurate drainage area calculation is crucial for designing effective drainage systems, flood control measures, and urban planning. It helps engineers determine the appropriate size for drainage infrastructure.
Tips: Enter peak discharge in m³/s, rainfall intensity in m/s, and runoff coefficient (between 0 and 1). All values must be positive numbers.
Q1: What is peak discharge?
A: Peak discharge is the maximum volume flow rate passing a particular location during a rainfall event, typically measured in cubic meters per second.
Q2: How is rainfall intensity measured?
A: Rainfall intensity is the ratio of the total amount of rain falling during a given period to the duration of the period, typically expressed in meters per second.
Q3: What factors affect runoff coefficient?
A: Runoff coefficient depends on surface type, slope, soil conditions, and land use. Impervious surfaces have higher coefficients than permeable surfaces.
Q4: When is this calculation most useful?
A: This calculation is essential for designing stormwater drainage systems, culverts, and other hydraulic structures in civil engineering projects.
Q5: Are there limitations to this formula?
A: The formula assumes uniform rainfall distribution and may need adjustments for complex terrain or varying surface conditions.