Experimental work for modular channel – quantifying backwater effects

Loading...
Thumbnail Image
Date
2019-06
Authors
Mas Balqis Binti Mas Lockman Ousin
Journal Title
Journal ISSN
Volume Title
Publisher
Abstract
Drainage impacts on the environment have given rise to a lot of concern about the quality and quantity of water. River Engineering and Urban Drainage Research Centre (REDAC) has implemented the Bio–Ecological Drainage System (BIOECODS) for ecological swales that have been used around Engineering Campus, Universiti Sains Malaysia. BIOECODS is designed for both water quantity and quality controls. Ecological swales are part of subsurface drainage which is environmentally friendly consist of the grassed swale on top and a conveyance conduit beneath it. REDAC have carried out many types of researches and developments to improve the application of BIOECODS. Laboratory tests on a newly – designed REDAC module are carried out to determine its Manning’s coefficient and to study the behaviour of the flow in the module through the flow rating curves. The modules were tested under three different slopes; 1:500, 1:750 and 1:1000 with flow depths varying from 10 – 40 cm while gate opening consist of 2cm, 4cm, 6cm and gate fully open. The value of Manning’s n determined for REDAC Module for gate opening 2cm are ranged from 0.044 until 0.223 and for gate opening 4cm are ranged between 0.026 until 0.123. Meanwhile, for gate opening 6cm the Manning’s coefficient obtained are ranged between 0.018 until 0.041 and for gate fully open are ranged between 0.019 until 0.025. The backwater effect slowed the flow in modules, energy dissipation was reduced, and storage was created. The Manning’s n was observed to decrease significantly with increasing of flow velocity, flow depth, slope and flow rate. This research is important for efficiency evaluation of a modular channel to act in the subsurface drainage system that consists of a blockage effect thus to help in solving surface water runoff problems, especially during peak flow.
Description
Keywords
Citation