IAHR, founded in 1935, is a worldwide independent member-based organisation of engineers and water specialists working in fields related to the hydro-environmental sciences and their practical application. Activities range from river and maritime hydraulics to water resources development and eco-hydraulics, through to ice engineering, hydroinformatics, and hydraulic machinery.
Log On
About IAHRDirectoryCommitteesMy IAHRNews & JournalseLibraryeShopEventsJoin IAHRWorld CongressDonate
spacer.gif
spacer.gif eLibrary
spacer.gif eLibrary
You are here : eLibrary : IAHR World Congress Proceedings : 35th IAHR Congress - Chengdu (2013) : THEME 4 - HYDRO-ENVIRONMENT : Hydrologic Considerations in Rehabilitating Existing Open Drains
Hydrologic Considerations in Rehabilitating Existing Open Drains
Author : Ting Fong May Chui and Palanisamy Bakkiyalakshmi
Riparian zones support a high level of biodiversity, mitigating flooding impacts and preventingpollutants from reachingthe rivers. They are, however,often replaced with concrete lined surfaces in urban areastobetter convey storm water. With increased environmental awareness in the recent decades, there are now rising interests in rehabilitating open storm water drains in heavily urbanized environment. This study designs and evaluates such engineered vegetative structuresby applying Storm Water Management Modeling (SWMM) on a generic catchment in Singapore. The first design involves decking a green channel cover on an existing conventional drain, which treats the overland flow from the upland areas before releases it to the drain.The second design constructs a vegetative swale along a conventional drain together with an upstream storage pond to maintain a perennial flow in the swale. To understand the performance of these engineered structures, the model is also run without the structures so that the hydrologic and hydraulic behavior of the original, conventional drainis understood. The modeling results depict that the green channel cover established atop of the draindelays and reduces peak runoff.The vegetative swale has a similar, but even larger,impacton the peak runoff. In addition, it maintains a low flow throughout the simulation period with the release from the upstream storage pond during non-rainy days. Overall, the modeling results show that these structures could slow down the release of overland flow to the drainand also maintaina low flow and green cover year around, enhancing the growth of flora and fauna in Singapore drainage system.
File Size : 408,593 bytes
File Type : Adobe Acrobat Document
Chapter : IAHR World Congress Proceedings
Category : 35th IAHR Congress - Chengdu (2013)
Article : THEME 4 - HYDRO-ENVIRONMENT
Date Published : 18/07/2016
Download Now