Given: Waterval catchment (A = 120 km²) shown in Fig. 1. The slope of the watershed is given in Fig. 2. The length of the longest watercourse = 2.5 km Chart Title 100 A = 35% Forest Silty loam A = 40% Farmland Clay 80 60 20 40 A = 25% 20 Pasture о Sandy loam 0 500 1000 1500 2000 2500 3000 Figure 1 Figure 2 2.1. Calculate the slope of the longest watercourse using: (a) Equal Area Method (b) 1085 method 2.2. Calculate the intensity and flood peaks corresponding to a return periods of 10, 50 and 70 years using the following methods: (a) Rational Formula (b) Standard Design Flood (c) Briefly explain the difference between the two methods. Comment the applicability of Rational Formula for the catchment.
Given: Waterval catchment (A = 120 km²) shown in Fig. 1. The slope of the watershed is given in Fig. 2. The length of the longest watercourse = 2.5 km Chart Title 100 A = 35% Forest Silty loam A = 40% Farmland Clay 80 60 20 40 A = 25% 20 Pasture о Sandy loam 0 500 1000 1500 2000 2500 3000 Figure 1 Figure 2 2.1. Calculate the slope of the longest watercourse using: (a) Equal Area Method (b) 1085 method 2.2. Calculate the intensity and flood peaks corresponding to a return periods of 10, 50 and 70 years using the following methods: (a) Rational Formula (b) Standard Design Flood (c) Briefly explain the difference between the two methods. Comment the applicability of Rational Formula for the catchment.
Chapter2: Loads On Structures
Section: Chapter Questions
Problem 1P
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Transcribed Image Text:Given: Waterval catchment (A = 120 km²) shown in Fig. 1. The slope of the watershed is given in Fig. 2.
The length of the longest watercourse = 2.5 km
Chart Title
100
A = 35%
Forest
Silty loam
A = 40%
Farmland
Clay
80
60
20
40
A = 25%
20
Pasture
о
Sandy loam
0
500
1000
1500
2000
2500
3000
Figure 1
Figure 2
2.1. Calculate the slope of the longest watercourse using:
(a) Equal Area Method
(b) 1085 method
2.2. Calculate the intensity and flood peaks corresponding to a return periods of 10, 50 and 70 years using
the following methods:
(a) Rational Formula
(b) Standard Design Flood
(c) Briefly explain the difference between the two methods. Comment the
applicability of Rational Formula for the catchment.
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