Letters | How Hong Kong can prepare to face the next once-in-a-century rainstorm
- Readers discuss how the city can up its flood prevention game, and measures that are not been taken to tackle climate change
Recent rainstorms have thoroughly tested Hong Kong’s water-diverting capabilities. Although the city has a world-class flood prevention system, it’s clear that more needs to be done.
As the climate catastrophe wears on, and extreme weather becomes more prevalent, the city must improve its water infrastructure.
Measures that increase absorption of water into the soil can reduce the impact of flooding. Healthy soil can store a lot of water in the wet season. However, it may also come loose and be washed away when there is heavy rain. Planting more trees could help, as their roots hold soil together while also absorbing water themselves.
Semi-permeable pavement could also realise the untapped potential of soil by letting excess water soak into the ground and routing it to drainage systems.
Flood bypass tunnels can divert stormwater through dense urban areas, away from downtown areas vulnerable to inundation, and release the water into the sea. One of these tunnels is already in use in Tsuen Wan, increasing its capacity to withstand huge downpours.
Perhaps we need more of such tunnels in low-lying areas such as Heng Fa Chuen. Upgrading our drainage systems is key to ensuring that we can continue to safeguard ourselves from climate disasters.