<![CDATA[ABSTRACTThis research was conducted in December 2020 in Koto Panjang Hydroelectric Reservoir, Kampar Regency, Riau Province. Sampling was conducted in 2 stations, namely in full KJA area and less KJA area, each station consists of 3 sampling points. Sampling was done every 4 hours during 3 days. Sampling was conducted in 6 depths based on tranparency, namely surface, 2 Secchi depth , 4 Secchi depth, 10 Secchi depth, 20 Secchi depth, and the bottom of the lake. Result shown full KJA area the average DO range 1.64 – 7.11 mg/L, CO2 ranges from 6.21 – 27.08 mg/L, pH ranges from 5.20 – 6.73, temperatures range from 25 – 32°C and transparency 106 cm. While in less KJA area average concentration of DO ranges from 1.51 – 7.01 mg / L, CO2 ranges from 5.77 - 23.97 mg / L, the average pH ranges from 5.73 - 6.50, temperatures range from 24 - 32 ° C and transparency 118 cm.Two way anova test concentrate of DO, CO2, and pH in full KJA area and less KJA were not significantly different. Keywords: Profil Vertikal, Parameter Kualitas Air, KJA, Waduk PLTA Koto Panjang]]>
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