Evaluating the impact of urban growth on the design of storm water drainage systems

被引：0
作者：
Abd-Elhamid H.F. [1 ,2 ]
Zeleňáková M. [3 ]
Vranayová Z. [4 ]
Fathy I. [1 ]
机构：
[1] Department of Water and Water Structures Engineering, Faculty of Engineering, Zagazig University, Zagazig
[2] Civil Engineering Department, College of Engineering, Shaqra University, Dawadmi
[3] Department of Environmental Engineering, Faculty of Civil Engineering, Technical University of Kosice, Kosice
[4] Department of Building Facilities, Faculty of Civil Engineering, Technical University of Kosice, Kosice
来源：
Zeleňáková, Martina (martina.zelenakova@tuke.sk) | 1600年 / MDPI AG, Postfach, Basel, CH-4005, Switzerland卷 / 12期
关键词：
KSA; Runoff coefficient; Storm water drainage systems; StormCAD; Urbanization;
D O I：
10.3390/W12061572
中图分类号：
学科分类号：
摘要：
Urban growth is one of the major causes of flooding in urban areas. This affects the runoff coefficients, which is among the most important factors that affect the design of storm water drainage systems. Changing the runoff coefficient will affect the design parameters of the drainage network, including outfall discharge, velocity, lag time and cost of construction. This study aims to assess the effect of changing the runoff coefficient due to urban growth on the design of a storm water drainage system. The hydrological models Hyfran, StormCAD and GIS are used to analyze different runoff coefficients. This study examines three zones in Dammam in the Kingdom of Saudi Arabia (KSA). The data developed from the models for the current case studies are used to develop an empirical equation to predict the max discharge for other catchments. The discharge is a function of the return period, runoff coefficient, drainage density, longest path, rainfall intensity and catchment area. To validate the developed equation, we use it to estimate the discharge in a real case study in South Korea. A comparison between the measured discharge and estimated discharge shows that the empirical equation is capable of predicting the maximum discharge for different catchments with high accuracy. Then, the validation of the models is carried out to determine the effect of the runoff coefficient on the design of a storm water drainage system in a case study in KSA. The results show that an increasing runoff coefficient due to urban growth increases the outfall discharge and velocity of storm water drainage systems, as well as affecting the cost of construction and decreasing the lag time. The cost increases by two to three times with increasing urbanization. This study provides a new perspective on the hydrologic impact of urban growth on the design of storm water drainage systems, which are essential for flood management. Moreover, the relationship between urban growth and the cost of storm drainage networks is explored, which could help decision makers to make appropriate judgements. © 2020 by the authors.
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