Btw，the drainage is designed to withstand 100mm/h rainfall?
The is quite subjective, as this hourly rate is based on raingauge located in HKO...
CEDD/ DSD use a performance indicator of ### mm/h and flood width ( max) ， piezometer reading to illustrate effectiveness of drainage.
The performance is area specific, eg drainage system in Po Shan , Tsz wan Shan ，new clearwater bay road, are different.
We will hear more "one in hundred years" , "one in two or three hundred years" high temperature, rainfall, flood on the news, globally due to extreme weather
For extending the rainfall forecast time, my suggestion is:
Acquire a geostationary weather satellite with increased resolution.
- Install rain detection monitors surrounding HK territories the extend the are of coverage to at least four times the existing areas. Existing equipment has half hour forecast in advance. With increased coverage, this will increase to 1 hour in advance or more.
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