Efficiency Of Swale And Dry Pond For Stormwater Management
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Date
2009-08
Authors
Abd. Manap, Asnol Adzhan
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Abstract
The implementation of the Best Management Practices (BMPs) in a drainage system
through the Stormwater Management Manual For Malaysia or better known as Manual
Saliran Mesra Alam (MSMA), focusing on constructed swale and dry pond, was
studied.
The study was carried out on the Bio-Ecological Drainage System (BIOECODS)
at Engineering Campus, Universiti Sains Malaysia (USM), Nibong Tebal, Pulau Pinang,
located in Kerian River Basin. Besides the implication of the swale and dry pond toward
the inflow hydrograph of a series of ponds (detention pond, wetland and recreational
pond known as ECOPOND) in managing stormwater quantity in development area,
factors that affect the effectiveness of the swale and dry pond using hydrologic and
hydraulic model were also identified.
The collected data such as rainfall, flow, water level, emptying time and
infiltration rate from October 2003 until December 2008 at USM were analysed using
SWMM 5 model. The simulated hydrographs for swale, dry pond, wetpond, detention
pond, wetland and recreational pond were compared with recorded flow at the sites.
The modeling shows that the SWMM 5 model has the accuracy up to 30% in simulating
the observed hydrographs.
The integrated swale and dry pond as designed for BIOECODS has attenuated
the peak flow compared to that of a concrete drain system. The SWMM 5 model shows
that there is a reduction of 121.4% in peak flow. Also, the increase in peak flow is
expected if several of the existing dry ponds are to be replaced for new development
purposes. These results can lead to better understanding of the role of swale and dry
pond that suit the Malaysia climate and environment.
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Keywords
Efficiency Of Swale , For Stormwater Management