Importance of time of concentration in run off peak flow estimation

Mamun, Abdullah Al and Salleh, Md Noor and Ibrahim, Saerahany Legori and Masbah, Dani Irwan and Daoud, Jamal Ibrahim and E.M. Yahya Khan, Nasehir Khan (2022) Importance of time of concentration in run off peak flow estimation. In: 1st International Conference on Civil Engineering 2022, 9-10 August 2022, Gombak, Kuala Lumpur ( Virtual Conference). (Unpublished)

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Abstract

Various methods and equations are used for hydrological calculations. Calculation of hydrograph peak flow is one of the common uses of such methods or equations. Peak flows and hydrographs can be calculated using several techniques. The manual calculation is one of the common ways to determine the peak flows for drainage design and river capacity of small catchments with a simple drainage network. In order to calculate the peak flow, the design rainfall duration has to be appropriate; which will reflect the critical storm duration. The critical storm duration on the other hand depends on the time of concentration (tc) of the catchment. However, most of the equations for tc available in the literature are empirical. At least 23 equations could be traced in various references, which consist of different geophysical and other hydrological parameters. This paper is intended to explain the importance of the proper use of tc to calculate peak runoff flow as accurately as possible. A review of the existing methods revealed inconsistencies among a few methods found in the literature. The correct value of the time of concentration (tc) is important for the application of the Rational Method, as the value of tc helps the designer to assume the storm duration critical to get the maximum peak flow value.

Item Type:	Conference or Workshop Item (Plenary Papers)
Additional Information:	5174/102331
Uncontrolled Keywords:	Drainage, Hydrology, Peak Flow, Rainfall-runoff, Water Resources
Subjects:	T Technology > TA Engineering (General). Civil engineering (General) > TA174 Engineering design
Kulliyyahs/Centres/Divisions/Institutes (Can select more than one option. Press CONTROL button):	Kulliyyah of Engineering > Department of Civil Engineering
Depositing User:	Dr Abdullah Al Mamun
Date Deposited:	06 Jan 2023 16:22
Last Modified:	06 Jan 2023 16:22
URI:	http://irep.iium.edu.my/id/eprint/102331

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