Size of catchment, soil types and land use are some of the factors that influence the flood phenomenon. Generally, the amount and behavior of the runoff from precipitation are analyzed to observe their effects on the catchment in terms of flood occurrence. This study measures the likelihood of flood event by comparing the peak flow rates at the pre development and post development stages of the major system. The approach used is by the most common practice in hydrology that is Rational Method.

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... ith a higher peak flow rate obtained at post development stage, it has been proven that as more urbanization takes place, there is the more flood occurrence. Similar results are obtained where the poorly-drained soils like peat and clay are present at certain area in the region. It has been verified that the size of catchment contributes the most on the flood risk.