[01] Pei-Ling Hou, Purification Division, Taipei Water Department, Taipei, Taiwan. [02] Deng-Fa Shiu, Purification Division, Taipei Water Department, Taipei, Taiwan.

The aim of this investigation is: A hydrology and water turbidity monitoring mechanism in Great Taipei catchment area which can be used as precautionary warning for raw water turbidity and flux of Xindian Creek during typhoon. Emergency plan for purification plant before typhoon approaches includes: 1. emptying sludge in all sedimentation basins; 2. timely measurement of turbidity at raw water intake by technicians during typhoon; 3. reserving back-up sedimentation basins; 4. reducing the water influx treatment when water turbidity above control level; 5. maintaining the flux of full raw water tunnel if purification process stops water inflow; 6. diluting high turbidity raw water with reservoir water. Limited to existing devise, Zhitan Purification Plant has enhanced effectiveness of the desilting basin to reduce the turbidity level of raw water. Most importantly, accurate coagulation dosing helps to ensure excellent water quality and stable water supply.

Purification Plant, High Turbidity Raw Water, Extreme Weather

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