Drainage System In Flat Area Using Groundwater Recharge Well In Solving Flooding Problem
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Date
2015-01
Authors
MUSA, SABARIAH
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Abstract
Sri Gading in Johor faces water related problems that are caused by excessive surface runoff
floods the low areas and ineffective drainage system during wet season. The low infiltration
rate of the soil in Sri Gading is caused by low permeability of fine-grained sizes of silty clay.
Soil investigation work consisting surface and sub-surface studies were conducted until deep
layer clay at 50 m from the mean sea level. The surface studies included infiltration test,
resistivity survey, and pumping and recovery tests, while permeability, consolidation, and
basic soil classification tests were carried out in subsurface investigation. The flow rate of
groundwater in the study area is controlled by two properties of the soil layer, namely
porosity and permeability. From the field test, the permeability of the soil is 0.0001–0.086
m/day which falls into the standard range of silty clay. On the other hand, Sri Gading area
encounters water supply shortage during dry season. Therefore, the replica of a recharge well
system (REWES) as an underground retention system is proposed to solve both flooding and
water scarcity problems by recharging treated surface runoff into aquifer system. The
combined concept of pumping and recharge was evaluated to effectively capture up to 31%
(12.5 m3/day – recharge standard 20% -100%) throughout 2 hours in (emergency period) of
reaches. This geological and mineralogy study establish the groundwater quality relationship
between pure groundwater and contamination quality control work during discharge
(pumping method) or recharge (dilution method) actions. By letting water pass through the
ground, its quality will change, and its geo-hydraulic characteristics will improve the
capacity based onsite design and environmental problems. Then, application of retention
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concept is integrated with water cycle for urban stormwater in solving flooding problem and
water supply management.
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Keywords
Drainage System In Flat Area Using Groundwater Recharge Well , In Solving Flooding Problem