Water Quality and Trophic Status Study in Sembrong Reservoir during Monsoon Season

• Published in: IOP conference series. Earth and environmental science Vol. 140; no. 1; pp. 12079 - 12086
• Main Authors: Hashim, S I N S, Talib, S H A, Abustan, M S, Tajuddin, S A M
• Format: Journal Article
• Language: English
• Published: Bristol IOP Publishing 01.04.2018
• Subjects: Ammonia; Chlorophyll; Contaminants; Contamination; Dissolved oxygen; Nitrogen; Parameters; pH effects; Phosphorus; Raw water; Reading; Reservoirs; Trophic levels; Trophic status; Water quality
• ISSN: 1755-1307; 1755-1315
• DOI: 10.1088/1755-1315/140/1/012079

Sembrong is one of the reservoirs in Johor that supplies raw water to consumer for daily activities usage. Cleanliness and quality of water must be maintained to ensure that contamination is not applicable. This study is to determine the effects of sedimentation on water quality due to the deposition of sediment in the reservoir and to identify the rate of ammonia based on the location of the study area. There are several parameters required to obtain the data and reading for this study namely the temperature, dissolved oxygen, pH value, ammonia nitrogen and trophic status parameter that are consisting of Chlorophyll, total phosphorus and secchi depth. Seventeen (17) locations along Sembrong reservoir had been identified for sampling activities. From the result obtained, the reading of temperature and pH value has less significant differences between the locations involved. However, for dissolved oxygen, the highest readings were taken at location 6 and 7 which are 9.12 mg/L and 9.05 mg/L respectively compared to other location with the average reading of 8 mg/L. For ammonia nitrogen, the highest reading was at location 1 which is 2.24 mg/L, while the lowest reading at location 13 and 14 with 0.29 mg/L. Chlorophyll readings showed the highest reading of 92.33 μg/L at location 2 which is near to the inlet area while the lowest reading were taken at location 14 with 55.97 μg/L. For total phosphorus, location 1 has the highest reading of 19.50 μg/L compared to location 15 with 9.15 μg/L. The overall result indicates that the reading is high near the inlet and decreasing at the next location. So roughly, the river that connects to the Sembrong reservoir was carrying contaminants.