Please help, the area runoff coefficient and inlet time for each sub catchment shown in the table. A 27-acre drainage basin comprising of seven sub-catchments is shown in Fig. 1. Determine the design flows (Q)entering manholes A, B, C, and E in cfs for a 5 year return period. The area, runoff coefficient and inlet time for eachsub-catchment is shown in Table 1; the length and slope for each pipe in Table 2. Use the rainfall intensity equation12070.175Ta+27where i is the rainfall intensity in inches/hr, Tis the return period and T. is the duration in minutes. Table 1. Characteristics of the drainage basinCatchmentAreaRunoffCoelicientInlettime(acres)Ct(min)20.7||30.77II40.610IV40.610V0.515VI4.50.515VII4.50.515

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Answered: Please help, the area runoff…

Engineering

Civil Engineering

Please help, the area runoff coefficient and inlet time for each sub catchment shown in the table.

Structural Analysis

6th Edition

ISBN:9781337630931

Author:KASSIMALI, Aslam.

Publisher:KASSIMALI, Aslam.

Chapter2: Loads On Structures

Section: Chapter Questions

Problem 1P

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Question

Please help, the area runoff coefficient and inlet time for each sub catchment shown in the table.

A 27-acre drainage basin comprising of seven sub-catchments is shown in Fig. 1. Determine the design flows (Q)
entering manholes A, B, C, and E in cfs for a 5 year return period. The area, runoff coefficient and inlet time for each
sub-catchment is shown in Table 1; the length and slope for each pipe in Table 2. Use the rainfall intensity equation
12070.175
Ta+27
where i is the rainfall intensity in inches/hr, Tis the return period and T. is the duration in minutes.

Table 1. Characteristics of the drainage basin
Catchment
Area
RunoffCoelicient
Inlettime
(acres)
C
t(min)
2
0.7
||
3
0.7
7
II
4
0.6
10
IV
4
0.6
10
V
0.5
15
VI
4.5
0.5
15
VII
4.5
0.5
15

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