2005

CAPTURING EXTREME RAINFALL EVENTS IN KERAYONG CATCHMENT

Mohd Nor Mohd Desa, Munirah Akhmal H., Kamsiah A.W.
Humid Tropics Centre (HTC) Kuala Lumpur

This paper discusses the extreme event of recorded rainfall in the Kerayong river catchment with rapid growth rate due to urbanization process. From the two years data collected in the catchment, the analysis will determine the numbers of storm events, distribution of rainfall in the catchment and the highest rainfall at 1,3 and 5 minutes interval for better understanding and input of flood forecasting and flood mitigation procedure in the future for similar catchment characteristic.

CHARACTERISTICS OF SHORT DURATION EXTREME RAINFALLS IN SELANGOR, MALAYSIA

Mohd Nor Mohd Desa, P.R. Rakhecha
Humid Tropics Centre (HTC) Kuala Lumpur

The characteristics of short-duration (say less than 1 hour) events are of great importance in the engineering design of small and medium- sized hydraulic structures, such as road culverts and urban storm sewers. Therefore, engineers concerned with urban drainage works are constantly in need of the basic statistical characteristics of short-duration rainfall for calculating runoff. A short-duration rainfall analysis for Kuala Lumpur and part of the Malaysian state of Selangor was made by Mohd Nor Mohd Desa (1997) but a detailed analysis historical rainfall records from raingauges from the whole of Selangor, located in the equatorial region, so as to provide information on short-duration extreme rainfalls and the estimate their frequency of occurrence (usually in terms of return period in years). The results reported will not only be useful in the design of the urban drainage structures that may be constructed in the region of Selangor but will also provide a dataset of extreme rainfalls that have occurred in the equqtorial region.