Flood Problem at Junction Kg. Sentang : It causes and the Engineering Solutions

A case study was conducted at the development area in Batu Gajah, Perak Darul
Ridzuan, (Taman Batu Gajah and Kg. Tersusun Sentang). This particular research covers
analytical approaches to the issue of flash flood recurrence at the problem area for the
past 5 years with data collected from site investigation, surveys with the local residents
and interviews with the responsible authorities. Relevant data was analyzed and the
existing drain capacity and peak flow of 0.96 m3 /s and l.l4 m3/s respectively were
obtained. The study covers a catchment area of 3.7 hectares. The way of the existing
drainage design was implemented and constructed could be traced back to the early
planning stage of the development in Batu Gajah area namely during early 1970's. The
study found that there is a discrepancy between the actual performance and the intended
capacity of the drainage system. Application of On-Site Detention storage (OSD) was
analyzed for possible alternative to mitigate the flood problem. The OSD was found to be
able to reduce the peak flow to 0.15 m3 /s and alleviate the problem.