The performance of our drainage system could easily be affected by many factors. Mud and silt carried by storm flow could deposit graudually inside drains and channels and affect their flow capacities. Debris, large objects and tree fragments could also be washed down catchpits and channels and create serious blockage to the drainage system. Developments could affect flow paths and could bring unexpected flow to certain section of the drainage system. Therefore continual efforts are required to keep our drainage system in good working order. Our efforts mainly involve the following :

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