Jang, Taesoon Hong, Eunmi Kim, Jae-Hyun Ha, Suk-Jin Choi, Jae Woo Park, Jeong-Ann 2024-01-12T06:32:03Z 2024-01-12T06:32:03Z 2023-12-05 2023-11 0167-6369 https://pubs.kist.re.kr/handle/201004/79730 Gongji Stream flows into Lake Uiam, a potable water source for the capital region of Chuncheon, South Korea. Algal blooms often occur downstream of the Gongji stream in combination with drastic flow rate variations. Downstream water quality may also be affected by Yaksa stream. Yaksa stream joins Gongji stream before it reaches Uiam Lake, which is a drinking water source for the city. Limited data exists on the Yaksa stream water quality. Therefore, water quality parameters (pH, electrical conductivity (EC), biological oxygen demand (BOD), total nitrogen (T-N), total phosphorous (T-P), chlorophyll-a (Chl-a), total coliforms, and Escherichia coli (E. coli) concentration) were sampled from Gongji (at sites GJ1 and GJ2) and Yaksa (at sites YS1 and YS2) streams from May to September, 2022. The results revealed the overall water quality of both streams was good (BOD？=？0.27？3.66 mg/L; TP？=？0.003？0.074 mg/L), except on August 3. On August 3, the concentrations of BOD, TP, total coliforms, and E. coli were elevated, with the highest concentrations in samples from GJ2. The recent heavy rainfall potentially caused sewage inflows near GJ2. The correlation analysis revealed positive linear relationships in the 1-day cumulative precipitation with BOD (r？=？0.503), total coliforms (r？=？0.547), and TP (r？=？0.814). The Yaksa stream may be an Anabaena sp. source, which contaminated samples from YS1, YS2, and GJ2, but not at GJ1 (upstream of the tributary). English Kluwer Academic Publishers Water quality seasonal variation assessment of the Gongji and Yaksa streams, Chuncheon, South Korea Article 10.1007/s10661-023-12069-w 1 Environmental Monitoring and Assessment, v.195, no.12 Environmental Monitoring and Assessment 195 12 N scie scopus 001103928500003 Environmental Sciences Environmental Sciences & Ecology Article TOTAL PHOSPHORUS NUTRIENT GEOSMIN LIMITATION RIVERS LAKES Gongji stream Yaksa stream Water quality monitoring Precipitation E. coli Total phosphorous