3.2 Calculate the time of concentration (I), with the following design inputs: • Hydraulic length = 5000 m • The area mostly consists of moderate grass • Level at the highest point of the catchment = 2500 m above mean sea level (MSL). • Level at the lowest point of the catchment = 1000 m above MSL sea level. • Use the Kerby formula

3.2 Calculate the time of concentration (I), with the following design inputs: • Hydraulic length = 5000 m • The area mostly consists of moderate grass • Level at the highest point of the catchment = 2500 m above mean sea level (MSL). • Level at the lowest point of the catchment = 1000 m above MSL sea level. • Use the Kerby formula

Principles of Geotechnical Engineering (MindTap Course List)

9th Edition

ISBN:9781305970939

Author:Braja M. Das, Khaled Sobhan

Publisher:Braja M. Das, Khaled Sobhan

Chapter7: Permeability

Section: Chapter Questions

Problem 7.4P

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Determine the time of concentration for use in the NRCS method for a drainage basin located in Hardin County, Ohio having the hydraulic path described below:Overland Average Grass L = 100’ S = 1.6% n = 0.24Shallow Concentrated L = 680’ S = 3.2%Stream Flow L = 2950’ S = 0.61% Cross Sectiono B = 12’o T = 20’o y = 4’o n = 0.035 COUNTY 2-yr ; 5-yr ; 10-yr ; 25-yr ; 50-yr ; 100-yr HARDIN 2.5 ; 3.0 ; 3.5 ; 4.2 ; 4.7 ; 5.3
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Q- In fine sand aquifer region, design a well to get 10 litres/s yield under depression head of 2.5 m. Assume value of C'/A=0.60 cu-m/hr.
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Determine the time of concentration for use in the Rational Method for a drainage basin having the hydraulic path described below:Overland Average Grass L = 80’ S = 2.5%Shallow Conc. L = 450’ S = 4.8%Gutter Flow L = 200’ S = 1.9%