Question

A storm drain system is proposed for the following four subbasins shown in the attached figure. A design storm intensity for this region is defined from the following formula: 1 atcd In this formula the values for 'a' and 'b' are a function of the retum period and are defined in the following table T(yrs) a 10 0.209 0.573 25 11.995 0.566 50 13.521 -0.566 100 15.560 0.573 What is the 100-yr design flowrate for Pipe 2? Neglect the travel time in each pipeline when determining the rainfall intensity 7.5ac 8.5ac -0.80 -25mint 19min -0.87 5.5ac 12.5ac 30min 35min

Answer 1

Iiven 100づear desgo flowrate -for p b- -0 513 for pipe 0 Pr c i 36 3600 0% mif)

360D 5.5 ac 13600