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A 125-acre urban drainage area consists of three different watershed areas as follows: Downtown Area 50% Parks 15% Playgrounds 35%---If the time of concentration for the drainage area is 1.5 hr, determine the runoff rate for a storm of 50-yr frequency. Assume hat the rainfall-intensity curves in Figure 16.2 are applicable to this drainage area

A 125-acre urban drainage area consists of three different watershed areas as follows: Downtown Area 50% Parks 15% Playgrounds 35%---If the time of concentration for the drainage area is 1.5 hr, determine the runoff rate for a storm of 50-yr frequency. Assume hat the rainfall-intensity curves in Figure 16.2 are applicable to this drainage area

Structural Analysis
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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A 125-acre urban drainage area consists of three different watershed areas as follows: Downtown Area 50% Parks 15% Playgrounds 35%----If the time of concentration for the drainage area is 1.5 hr, determine the runoff rate for a storm of 50-yr frequency. Assume that the rainfall-intensity curves in Figure 16.2 are applicable to this drainage area.
Transcribed Image Text:A 125-acre urban drainage area consists of three different watershed areas as follows: Downtown Area 50% Parks 15% Playgrounds 35%----If the time of concentration for the drainage area is 1.5 hr, determine the runoff rate for a storm of 50-yr frequency. Assume that the rainfall-intensity curves in Figure 16.2 are applicable to this drainage area.
Table 16.2 Values of Runoff Coefficients, C Type of Surface Coefficient, C* Rural Areas Concrete sheet asphalt pavement Asphalt macadam pavement Gravel roadways or shoulders Bare earth 0.8-0.9 0.6-0.8 0.4-0.6 0.2-0.9 Steep grassed areas (2:1) Turf meadows 0.5-0.7 0.1-0.4 Forested areas 0.1-0.3 Cultivated fields 0.2-0.4 Urban Areas Flat residential, with about 30% of area impervious Flat residential, with about 60% of area impervious Moderately steep residential, with about 50% of area impervious Moderately steep built-up area, with about 70% of area impervious Flat commercial, with about 90% of area impervious 0.40 0.55 0.65 0.80 0.80
Transcribed Image Text:Table 16.2 Values of Runoff Coefficients, C Type of Surface Coefficient, C* Rural Areas Concrete sheet asphalt pavement Asphalt macadam pavement Gravel roadways or shoulders Bare earth 0.8-0.9 0.6-0.8 0.4-0.6 0.2-0.9 Steep grassed areas (2:1) Turf meadows 0.5-0.7 0.1-0.4 Forested areas 0.1-0.3 Cultivated fields 0.2-0.4 Urban Areas Flat residential, with about 30% of area impervious Flat residential, with about 60% of area impervious Moderately steep residential, with about 50% of area impervious Moderately steep built-up area, with about 70% of area impervious Flat commercial, with about 90% of area impervious 0.40 0.55 0.65 0.80 0.80
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