Evaluating the Effect of Deforestation on Decadal Runoffs in Malaysia Using the Revised Curve Number Rainfall Runoff Approach

This study presents a revised and calibrated Soil Conservation Service (SCS) curve number (CN) rainfall runoff model for predicting in Malaysia using new power correlation Ia = SL, where L represents the initial abstraction coefficient ratio. The traditional SCS-CN with proposed relation 0.2S is found to be unreliable, exhibits improved accuracy. emphasizes need design flood control infrastructure based on maximum estimated amount avoid underestimation of volume. If designed optimum CN0.2 values, it could lead an volume 50,100 m3 per 1 km2 catchment area Malaysia. forest areas reduced by 25% Peninsular from 1970s 1990s 9% East 1980s 2010s, which was accompanied increase decadal difference, most significant rises 108% 32% 2010s. recommends taking land use changes into account during prevention planning effectively address issues. Overall, findings this have implications management viable alternative conventional model, focus estimating accounting alterations planning. approach has potential enhance region.