Apart from environmentally friendly designs in flood control projects, we also apply the same concept to redress some existing nullahs in the rural and urban areas.  Aged concrete slopes or granite parapets alongside open channels are being replaced by hydromulch, grasscrete and/or planters.  Examples of our effort can be seen at nullahs in Kai Tak, Jordan Valley and Tsui Ping.

Jordan Valley Nullah–Present condition after improvement works

 
The side wall of Kai Tak Nullah (Choi Hung Road Section–Before (left) and after (right) improvement works)

 
Tsui Ping Nullah–Before (left) and after (right) improvement works