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Structural Analysis
6th Edition
ISBN: 9781337630931
Author: KASSIMALI, Aslam.
Publisher: Cengage,
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a.8 mins b.18mins c.12mins d.16mins

Transcribed Image Text:Given a 25-year storm event using the rational method for the drainage basin located in
Pennsylvania (Region 1)
Time of concentration details
Area: A=24 acres
Overland: Average grass cover: Length =100ft; slope =2.0 %
Shallow Concentrated Flow: Length= 750 ft; slope =4.0 %, unpaved
Stream Flow (See Fig Below): Length=1000 ft; slope=0.4%
Use design values from table 11.1 only
Impervious =0.5 acres
Wooded (fair) = 11.5 acres
Grass (fair) = 12 acres
Average cross section
Calculate the time for Overland Flow (t1)

Transcribed Image Text:Grass (fair) = 12 acres
Average cross section
Calculate the time for Overland Flow (t1)
4'
20'
▼
12₁
n = 0.035
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