How do clogged tributaries and drains slow east coast floodwaters?

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Clogged Waterways Hamper Floodwater Receding in East Coast Floods

Clogged tributaries and drainage systems filled with rubbish significantly contribute to the exacerbation of flood situations, particularly by slowing down the natural dispersal and receding of floodwaters. When heavy rainfall leads to flooding, the accumulation of debris, including household waste, trees, and soil, obstructs the flow of water. This blockage impedes the movement of floodwaters from inundated areas into main river systems, resulting in a prolonged presence of water in affected regions.
Obstruction by Rubbish and Debris

The presence of rubbish and natural flood debris such as fallen trees and accumulated soil within tributaries and drainage channels acts as a physical impediment to water flow. This material effectively slows down the process by which floodwaters are dispersed. Consequently, areas experiencing such blockages will see a slower rate of water level reduction compared to locations with clear waterways.
Impeded Flow into Rivers

A critical consequence of clogged drainage systems and tributaries during flood events is the significantly reduced capacity for water to flow from the flood sites into larger rivers. This restricted outflow means that the water accumulated in low-lying areas remains stagnant for a longer duration. The Ministry of Environment and Water has highlighted that this slow flow is a direct cause for floodwaters taking a longer time to recede in certain areas.
Need for Community Cooperation

The maintenance of drainage systems and tributaries requires substantial financial investment. However, the effectiveness of these systems is severely undermined by the public's practice of discarding garbage indiscriminately. Without community cooperation in preventing littering, the problem of clogged waterways persists, directly hampering the ability of floodwaters to recede, as observed during recent flood events impacting the east coast states.

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How do clogged tributaries and drains slow east coast floodwaters?

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