a) An urban catchment has an area of 85 ha. The slope of the catchment is 0.006 and the maximum length of travel of water is 950m. The land use of the area and the corresponding runoff coefficient are as given below: Land Use Roads Lawn Residential Area Industrial Area Depth of rainfall (mm) 5 The maximum depth of rainfall with a 25-year return period is as below: Duration (min) 17 Area (ha) 8 17 50 10 You may use the following equations: 10 26 20 Runoff coefficient 40 30 0.7 0.10 0.30 0.8 50 40 57 If a culvert for drainage at the outlet of this area is to be designed for a return. period of 25 years, estimate the required peak flow rate. 60 62
a) An urban catchment has an area of 85 ha. The slope of the catchment is 0.006 and the maximum length of travel of water is 950m. The land use of the area and the corresponding runoff coefficient are as given below: Land Use Roads Lawn Residential Area Industrial Area Depth of rainfall (mm) 5 The maximum depth of rainfall with a 25-year return period is as below: Duration (min) 17 Area (ha) 8 17 50 10 You may use the following equations: 10 26 20 Runoff coefficient 40 30 0.7 0.10 0.30 0.8 50 40 57 If a culvert for drainage at the outlet of this area is to be designed for a return. period of 25 years, estimate the required peak flow rate. 60 62
Chapter2: Loads On Structures
Section: Chapter Questions
Problem 1P
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Transcribed Image Text:a) An urban catchment has an area of 85 ha. The slope of the catchment is 0.006 and the
maximum length of travel of water is 950m. The land use of the area and the
corresponding runoff coefficient are as given below:
Land Use
Roads
Lawn
Residential Area
Industrial Area
.
The maximum depth of rainfall with a 25-year return period is as below:
Duration
(min)
Depth of
rainfall
(mm)
5
Area (ha)
8
17
50
10
17
10
26
20
40
Runoff coefficient
0.7
0.10
0.30
0.8
30
50
40
If a culvert for drainage at the outlet of this area is to be designed for a return
period of 25 years, estimate the required peak flow rate.
CLA
A, where i is in mm/h, A is in km².
3.6
57
60
You may use the following equations:
•
Kirpich Formula: time of concetration, t= 0.01947 x 950077 x 0.006-0.385
minutes)
Rational formula: Q₂ =
62
(in
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