도시하천에서 하수처리수의 유지용수 이용에 따른 영향 평가 연구
Study on the Effects of In-streams by Discharging the Treated Sewage in Urban Stream
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Abstract
Recently since urbanization has brought about a dried stream and a worse water quality, Anyang city discharged the third treated sewage into the upper stream of Anyancheon and Hakuicheon. As the result, Hakuicheon had the water level and velocity enough for a living thing in the water to live in but water quality was worse than it had been. Therefore in case of meeting the water level and velocity of the second grade water-quality which living things in the water can live in, the discharge and water qaulity to secure in-stream flow must be at least 0.350 ㎥/s and BOD5 3.2 mg/ respectively. In Anyancheon the water level was increased a little higher than it had been but the velocity was almost unchanged in comparison with it before. On the other hand the water quality was a little better than it had been. Therefore in case of meeting the water level and velocity of the third grade water-quality that people can do water-friendly activity, the discharge and water quality to secure in-stream flow must be at least 0.688 ㎥/s and BOD5 4.8 mg/ respectively. The water-quality prediction on the suggested eight scenarios was simulated in all satisfying the third grade water-quality.
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