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The critical BMPs are: sediment basins, temporary earth drains with check dams, and silt fence. The following notes may help in understanding the common failures in implementing these BMPs.
COMMENTARY ON 7.5.2. Issues of note that can be addressed by temporary drainage during construction include: provision of adequate permanent or temporary approved outfalls during the works; use of measures to reduce flow rates and remove silt from earthworks run-off drainage;
A temporary drainage system should be provided during the earthworks phase to drain surface runoff and silts loads from the earthwork areas to proposed silt trap ponds before discharging into earth drains and eventually to the Sg Tengah.
The primary purposes for designing temporary drainage are to: Minimize travel lane flooding. Prevent damage to property adjacent to a project during construction. Facilitate construction activities by temporarily rerouting or altering drainage conveyances.
The earthworks construction process produces earth-structures: cuts, fills or embankments, pavement support structures meeting specifications for stability, deformation, load-bearing capacity, hydraulic or other.
Identify and construct the temporary access for sedimentation basin; Construct the temporary earth drains that channeled to the sediment basin; Install the silt fence along the perimeter of the site; Construct wash trough and channeled to the nearest earth drain or sediment basin;
of placement of all necessary temporary works such as temporary earth retaining structures (if any), drainage and dewatering or groundwater control systems, ground movement monitoring systems, protective hoardings, barricades and signages, etc. to enable the excavation to be
