A. Evaluate the travel time associated with the 24-in diameter, 300-ft long cast iron pipe flowing just full and laid on a slope of 0.004 ft/ft. B. A new 7-acres suburban development is to be drained by a storm sewer that connects to a municipal drainage system. The time of concentration for the basin is 15 minutes, and the local intensity-duration-frequency relationship can be approximated as (i-5.6-0.2td), where ta is rainfall duration in hours. Estimate the peak runoff using the rational method. Make reasonable assumption for runoff coefficient. C. Evaluate how peak flow changes if the development described in Question B consists of two smaller subbasins: one has a drainage area of 5-acres and a runoff coefficient of 0.4, while the other drains 2-acres and has a runoff coefficient of 0.7. Compare the answer to that if the entire basin is characterized by a median runoff coefficient of 0.55.
A. Evaluate the travel time associated with the 24-in diameter, 300-ft long cast iron pipe flowing just full and laid on a slope of 0.004 ft/ft. B. A new 7-acres suburban development is to be drained by a storm sewer that connects to a municipal drainage system. The time of concentration for the basin is 15 minutes, and the local intensity-duration-frequency relationship can be approximated as (i-5.6-0.2td), where ta is rainfall duration in hours. Estimate the peak runoff using the rational method. Make reasonable assumption for runoff coefficient. C. Evaluate how peak flow changes if the development described in Question B consists of two smaller subbasins: one has a drainage area of 5-acres and a runoff coefficient of 0.4, while the other drains 2-acres and has a runoff coefficient of 0.7. Compare the answer to that if the entire basin is characterized by a median runoff coefficient of 0.55.
Traffic and Highway Engineering
5th Edition
ISBN:9781305156241
Author:Garber, Nicholas J.
Publisher:Garber, Nicholas J.
Chapter16: Highway Drainage
Section: Chapter Questions
Problem 12P
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Transcribed Image Text:A. Evaluate the travel time associated with the 24-in diameter, 300-ft long cast iron
pipe flowing just full and laid on a slope of 0.004 ft/ft.
B. A new 7-acres suburban development is to be drained by a storm sewer that
connects to a municipal drainage system. The time of concentration for the basin
is 15 minutes, and the local intensity-duration-frequency relationship can be
approximated as (i-5.6-0.2td), where ta is rainfall duration in hours. Estimate the
peak runoff using the rational method. Make reasonable assumption for runoff
coefficient.
C. Evaluate how peak flow changes if the development described in Question B
consists of two smaller subbasins: one has a drainage area of 5-acres and a runoff
coefficient of 0.4, while the other drains 2-acres and has a runoff coefficient of
0.7. Compare the answer to that if the entire basin is characterized by a median
runoff coefficient of 0.55.
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