Environmental Technology

 

a. Explain the rational formula, Q=CiA.
b. If the rainfall intensity is 4.0 inch/hour, watershed area is 10 acres, and rational runoff coefficient is 0.7, determine the peak runoff rate in ft3/s. Use the rational formula.
c. Describe the differences in computing peak rate of runoff using the rational formula versus the SCS TR 55 graphical method. Which method is simpler?
d. What are the differences between the following storm water inlets: curb inlet, gutter inlet, and combined inlet?
e. Why does land development typically increase the peak runoff rate? What are some methods used to mitigate the increased runoff rate?
f. Describe at least three methods of storm water quality control?
g. Explain the differences between a main channel, floodway, and floodplain. What activities can occur in each?

 

 

 

Sample Solution

Environmental Technology

Acceptable methods to calculate peak discharge include Rational Method and NRCS, TR 55 Graphical Flow Method (also known as SCS). The Rational Method predicts the peak runoff according to the formula: Q=CiA, where C is a runoff coefficient, i is the rainfall intensity, and A is the subcatchment area. The peak runoff is sustained until the event duration has elapsed, and then decreases linearly to zero. In Rational Method, drainage area is less than 50 acres. In SCS Method, drainage area is greater than 20 acres, also the SCS method should only be used when the Curve Number exceeds 50 and the time of concentration is greater than 0.1 hour and less than 10 hour.

 

 

 

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