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How can we calculate the peak discharge before development?

Calculate the peak discharge before development using the Rational Method equation Q = CiA, where Q represents the peak discharge, C is the runoff coefficient, and A is the area.

Peak Discharge Before Development Calculation

To calculate the peak discharge before development, we can use the Rational Method equation Q = CiA, where Q represents the peak discharge, C is the runoff coefficient, and A is the area. In this case, the area is 17 acres, and the runoff coefficient for pastureland is typically around 0.2.

The peak discharge before development can be calculated using the Rational Method. Given an area of 17 acres and a runoff coefficient of 0.2 for pastureland, we can use the Rational Method equation Q = CiA to determine the peak discharge.

Plugging in the values, we have:

Q = 3.5 in/hr * 0.2 * 17 acres

First, we need to convert the rainfall intensity from inches per hour to feet per hour. Since there are 12 inches in a foot, the rainfall intensity becomes 3.5/12 ft/hr.

Q = (3.5/12) ft/hr * 0.2 * 17 acres

Next, we convert the area from acres to square feet. Since 1 acre is equivalent to 43,560 square feet, the area becomes 17 * 43,560 square feet.

Q = (3.5/12) ft/hr * 0.2 * (17 * 43,560) square feet

By simplifying the equation and performing the calculation, we can determine the peak discharge before development. This calculation is essential for planning and designing the stormwater management system for the development project.