Abstract

AbstractThe pollutant load to Bukit Merah Reservoir (BMR) from its catchment area were evaluated in this study. BMR is a 40‐km2 man‐made lake located in the district of Kerian, Perak. BMR is divided into the north lake and the south lake by a 4.7‐km railway line. The reservoir water is fed by four rivers: Kurau (323.0 km2), Merah (4.25 km2), Jelutong (7.1 km2) and Selarong (3.1 km2), which flow through Pondok Tanjung Forest Reserve (6718 ha). The total quantity of suspended sediment inputs from all four rivers to the BMR was 55 164 t, with almost 93% of the sediment input coming from the Kurau River. The nutrient inputs to BMR in 2008 were about 77 t of phosphate, 24 t of ammonia‐N, 3 t of nitrite and 47 t of nitrate. The sediment, nitrate and nitrite inputs were retained in the reservoir. In contrast, the ammonia and phosphate inputs were released from the reservoir. The percentage retention was 78%, 63% and 34% for sediment nitrate and nitrite, respectively. The percentage of release phosphate was about 178, and 25 for ammonia. This study indicates that most of the nutrients entering BMR are from non‐point sources and that they are responsible for the impacts of sediment and nutrients on the receiving waterbody.

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