Ever wondered how flood protection works in Tsuen Wan and Kwai Chung? The answer lies partly here at the Tso Kung Tam Intake. This unsung hero plays a vital role in keeping these areas safe during heavy rains.
The Tso Kung Tam Intake is part of a larger drainage system. This system is designed to prevent flooding in Tsuen Wan and Kwai Chung. The intake helps divert surplus stormwater. It directs the water into the Ramble Channel. This alleviates flooding problems.
This innovative system improves the flood protection level of trunk drains. It can now handle a 200-year return period. This means it is designed to cope with a storm that has a 1 in 200 chance of occurring in any given year. The system avoids additional works in urban areas. It prevents environmental impacts from those works. The project protects downstream areas. These areas include urban and agricultural lands. This protects crops from washout during heavy rain.
The construction of the Tsuen Wan Drainage Tunnel, which includes the Tso Kung Tam Intake, considered environmental impacts. Measures were put in place to minimize disruption. “Best practice measures” helped suppress dust emissions during construction. Quiet plant and mobile noise barriers reduced noise pollution.
Ecological resources were carefully considered. Studies identified woodland and streams such as the Sam Dip Tam Stream and Tso Kung Tam Stream as having moderate ecological value. The design of the intake structures minimized habitat loss. Mitigation measures addressed the impact on these streams. The affected stream sections were already partially disturbed. The intake structures were designed to minimize further habitat loss.
Archaeological investigations found no sites of significance in the study area. Vibration impact on historical buildings was also considered. Mitigation measures were recommended. These included construction methods that minimized vibration. Pre-construction surveys assessed the condition of potentially affected buildings. Vibration monitoring was part of the EM&A program.
The project also addressed waste management. Effective planning was crucial during the construction phase. The handling, storage, treatment, and disposal of waste met environmental requirements.
Environmental friendly designs were incorporated into the drainage system. Cascade and rip rap were added at the outfall. These features reduce the velocity of discharge. They also prevent scouring and erosion of the seabed. The drainage tunnel is lined to prevent groundwater drawdown. This ensures that water levels in the stream courses are not affected.
The location of the intake and outfall structures were optimized. They are situated in disturbed areas or areas with lower ecological value. This minimizes the impact on habitats and vegetation. The Tso Kung Tam Intake stands as a testament to careful planning. It shows how engineering can work in harmony with the environment.