As a field engineer you are tasked to estimate the 25-year peak discharge for concrete parking lot that is 310 feet wide by 600 feet long using Rational formula. The longest flow path is 310 feet of sheet flow across the lot on a slope of 0.005 and 600 feet of shallow concentrated flow along the parking lot's length in a paved channel on a slope of 0.015. Use SCS procedures to determine the time of concentration using a 2-year, 24-hr rainfall of 2.4 inches. Use Figure below for the rainfall intensity in the rational equation. Intensity (in/hr) 0 10 20 25-yr average frequency 10-yr average frequency 30 40 -5-yr average frequency 2-yr average frequency 50 60 70 80 90 100 110 120 Duration (min)

As a field engineer you are tasked to estimate the 25-year peak discharge for concrete parking lot that is 310 feet wide by 600 feet long using Rational formula. The longest flow path is 310 feet of sheet flow across the lot on a slope of 0.005 and 600 feet of shallow concentrated flow along the parking lot's length in a paved channel on a slope of 0.015. Use SCS procedures to determine the time of concentration using a 2-year, 24-hr rainfall of 2.4 inches. Use Figure below for the rainfall intensity in the rational equation. Intensity (in/hr) 0 10 20 25-yr average frequency 10-yr average frequency 30 40 -5-yr average frequency 2-yr average frequency 50 60 70 80 90 100 110 120 Duration (min)

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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Concept explainers

Storm Sewers and Detention

The storm drains system transports rainwater or stormwater and other runoff from roads, parking lots, and roof downpipes directly to nearby creeks, rivers, or the sea without any treatment.

Question

As a field engineer you are tasked to
estimate the 25-year peak discharge for
concrete parking lot that is 310 feet
wide by 600 feet long using Rational
formula. The longest flow path is 310
feet of sheet flow across the lot on a
slope of 0.005 and 600 feet of shallow
concentrated flow along the parking lot's
length in a paved channel on a slope of
0.015. Use SCS procedures to determine
the time of concentration using a 2-year,
24-hr rainfall of 2.4 inches. Use Figure
below for the rainfall intensity in the
rational equation.
Intensity (in/hr)
0
10 20
25-yr average frequency
10-yr average frequency
30
40
-5-yr average frequency
2-yr average frequency
50 60 70 80 90 100 110 120
Duration (min)

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