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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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