Question

A watershed consists of three adjacent tracts, each discharging to a centrally located common outlet. The area and rational runoff coefficient of each tract are given. The peak flow coincides with the time to concentration, which is 16 min. The rainfall intensity at the time to concentration is 2.8 in/hr. There is no cross runoff. What is the approximate peak runoff from the watershed at the time of concentration

Answer 1

Answer: hello some part of the question is missing attached below is the missing part

answer : 24. cfs

Explanation:

Determine the approximate peak runoff from the watershed at the time of concentration

given data :

rainfall intensity = 2.8 in/hr

discharge by rational formula  Q = C*I*A

where : C = runoff coefficient , I = intensity of rainfall , A = area  ( Note : 1 arc = 6272649 ( inch )^2

Hence approximate peak runoff from watershed

= ∑ Q = Q1 + Q2 + Q3  = 24.18 ft^3 / sec ≈ 24 cfs

attached below is the detailed solution