Runoff on a 0.5-hectare parking lot flows toward a low area and then toward a street drain. This flow pattern yields concentrated flow with a width of roughly 1.75 m (you can assume rectangular flow cross section) and a slope of 0.2%. The surface of the parking lot provides a Manning’s roughness of 0.020. If a storm with an average intensity of 2.00 cm/hr passes over the parking lot, how deep will the concentrated flow be? You may assume that the vast majority of rainfall reaching the parking lot will become runoff and that storm duration is sufficiently long to allow all parts of the parking lot to contribute to runoff.

Answered: Runoff on a 0.5-hectare parking lot…

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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Runoff on a 0.5-hectare parking lot flows toward a low area and then toward a street drain. This flow pattern yields concentrated flow with a width of roughly 1.75 m (you can assume rectangular flow cross section) and a slope of 0.2%. The surface of the parking lot provides a Manning’s roughness of 0.020. If a storm with an average intensity of 2.00 cm/hr passes over the parking lot, how deep will the concentrated flow be? You may assume that the vast majority of rainfall reaching the parking lot will become runoff and that storm duration is sufficiently long to allow all parts of the parking lot to contribute to runoff.

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Introduction

Manning equation is an empirical formula for the velocity of flow of water or any liquid flowing in an open channel.It is use to compute discharge, frictional losses and average velocity in the channel.

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