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INTRODUCTION
Department of Irrigation and Drainage (DID)
Malaysia has appointed REDAC to carry out a “Rehabilitation of Ex-Mining
Ponds and Existing Wetland for Integrated Storm water Facilities” at DID
Mechanical Section, Ipoh. In line with the implementation of the new urban
drainage manual known as Manual Saliran Mesra Alam (MSMA), the Study
will be a showcase for development of ex-mining ponds as storm water
facilities in Perak and throughout Malaysia. The study is a pilot project
that rehabilitates the ex-mining pond into multi-functional uses, which
include recreational, water reuse and storm water retention purposes.
Background
The study area consists of DID Mechanical
Section covering an area of 88 acres. The area is located on Lot 40367 River
Kinta, Kinta District. The study area is situated on a former ex-mining land
which consists of sandy soil and largely sparsely vegetated. The main
feature of the site is the two ex-mining ponds (Figure 1) which are located
in the vicinity of the buildings. There are also swampy areas (Figure 2)
which stretched along the eastern border of the site and some parts of the
swampy area may extend outside the study area. Drainage system in the Study
area is based on rapid disposal approach which disposes the surface runoff
to the roadside concrete drain prior to discharging into River Kinta via the
pump station located near by. The surface runoff from the open area flows
into the two main ex-mining ponds which are connected to the River Kinta by
earth drain.
The ex-mining pond and the existing wetland
(swampy areas) shall be rehabilitated and restored into ecological ponds
with multi-functional uses. The planning and design into the restoration and
rehabilitation of the ecological ponds shall be based on the MSMA and
fulfill the requirement of water quantity and quality control.
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Existing Ex-Mining Pond
1 |
Existing Ex-Mining Pond
1 |
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Figure 1 Ex-Mining
Ponds |
Figure 2 Several
Common Wetland Species in the Project Area |
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Figure 3 Layout of
Integrated Stormwater Facilities at DID Mechanical Section, Ipoh |
OBJECTIVES OF STUDY
The objectives of this Study as are stated as
below:
(a) To
set-up an example and showcase of ex-mining pond rehabilitation and
restoration as storm water facilities in
Malaysia.
(b) To
study the existing hydraulic and hydrologic characteristics of existing
ponds and the surrounding drainage system.
(c) To
evaluate the effectiveness of the proposed rehabilitation and restoration
works
(d) To
establish the data collection system to monitor the hydraulic, hydrology and
water quality parameters in the study area.
(e) To
carry out the cost benefit analysis for the proposed system.
(f) To
establish the guideline for rehabilitation and restoration of ex-mining pond
for storm water and recreational purposes.
CONCEPTUAL DESIGN
The main components of the proposed integrated
storm water facilities (Figure 3) include Ex-mining pond 1 designed as a regional pond to control both water quantity and quality from
the study site and the surrounding areas. The conveyance system is made of
an engineered waterway with features those of natural rivers.
Storm water runoff from the botanical garden is conveyed to the engineered
waterway via swale. Further treatment of storm water runoff is
provided through a constructed wetland connected to the Ex-Mining Pond 1 via
the engineered waterway. The existing wetland will treat runoff from the
nearby surrounding areas located outside of the study area. The Ex-Mining
Pond 2 is designed as a community pond to control both water
quantity and quality from the study site only. An automatic tidal gate is
provided at the downstream end before the runoff is discharged to River Kinta.
CONCLUSIONS
The design of the project is based on MSMA by
providing a series of treatment train for both storm water quantity and
quality control. The construction of the proposed storm water facilities
will provide an excellent example of storm water management components for
other locations throughout Malaysia.
ACKNOWLEDGEMENTS
REDAC would like to thank DID Malaysia for
continuing support by providing the contract research for the study.
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