Self-Cleansing Urban Drain Using Sediment Flushing Gate Based On Incipient Motion
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Date
2013-12
Authors
Hin Joo, Charles Bong
Journal Title
Journal ISSN
Volume Title
Publisher
Universiti Sains Malaysia
Abstract
Sediment deposition in urban open concrete storm drain has caused many
adverse effects to the drainage system such as flash flood and environmental
pollution. This study aimed to provide recommendations for the purpose of
sedimentation mitigation in urban open concrete storm drain. To understand the
physical characteristics of sediment deposition; sampling was taken from 57
locations in Kuching city, surrounding towns outside Kuching city and Penang
consisting of residential, commercial and industrial areas and subjected to sieve
analysis. Results showed that the samples were mainly inorganic and noncohesive
with sand as the major component followed by gravel and silt and clay
for most of the samples. To improve the design criteria, incipient motion
experiments were conducted in a 0.6 m wide flume for sediment with 50 d sizes of
0.81 mm, 1.53 mm 4.78 mm. Combining the results from the current incipient
motion experiments with the results from an earlier researcher for a 0.3 m wide
flume, multiple linear regression were performed and the best equations for each
of the critical shear stress and critical velocity approach were developed. A design
chart relating the self-cleansing design relationship between drain minimum slope
with the design minimum flow rate and the respective standard drain size was
also developed. To further improve the self-cleansing capability of open concrete
storm drain, a tipping flush gate was designed and installed on site at Taman
Pekaka, Nibong Tebal, Penang and subjected to monitoring for four months
between 14th November 2012 and 15th March 2013.
Description
Keywords
Urban Drain , Incipient Motion