• 한국농공학회지
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• 제12권4호
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• pp.2078-2083
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• 1970

The purpose of this study is to give the data neccesary for improving the planning of drainage structures, specially inverted siphons, in irrigation channels. With the samples of 15 drainage inlets, one drainage flume, 16 drainage inverted siphons and 6 drainage culverts in the 3 lines of irrigation channel under Chong-Won Irrigation Association, author abtained the following results. 1. It is presumed that design drainage discharge should be determined with some additional reserves, on the basis of the maximum rainfall intensity in local area and the size of drainage area on the topographical map, avoiding the way of eye measure. 2. Location of drainage inlet should be kept away from the place where topography can make lots of wash load, but when unavoidably allowing the inflow into irrigation channel, wash load outlet with even the purpose of drainage, or drainage flume in stead of drainage inlet should be taken account of. 3. It is presumed that drainage flume may be the structure which can perform its function from a structural point of view as far as topography permits. 4. Drainage inverted siphon should be avoided at any place as much as possible; a) In case that location of the siphon would be permitted only at paddy field, drainage area hauing the amount of discharge which requires more than 90cm in diameter could only be allowed. b) In this case, crest elevation of the tank of both inlet and outlet, at least, should not be lower than the surface level of paddy field. c) As far as topography and stratum permit, ratio of depth of outlet tank to head drop should be decreased as much as possible so that discharging efficiency of wash load could increase. d) In case of avoiding the setting of the siphon, irrigation aqueduct, irrigation inverted siphon, or drainage flume should be recommended in accordance with topography. 5. Discharging capability of wash load by drainage culvert appeared to depend hardly upon the diameter of the culvert, but greatly upon the location, specially near village, for there stones and dirts dumped may considerably be piled up. So, a counter plan for that is required.

• 대한토목학회논문집
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• 제31권6B호
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• pp.541-550
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• 2011

본 연구는 자갈접촉 산화공법의 단점을 연속접촉재 자유월류형 역사이폰 만곡수로시스템으로 보완함으로써 하천수질의 개선효과를 증대시키기 위한 것이다. 이 시스템은 접촉시간의 확장으로 시설규모를 축소시키고, 접촉재의 필터화를 통해 공극의 폐쇄 시 교체가 용이하도록 개선하였다. 또한 이 시스템은 단일 접촉재 사용으로부터 혼합 연속 접촉재를 사용할 수 있도록 개량된 수질개선 공법으로 개발되었다. 개발된 시스템은 대전광역시 소재 지방하천인 탄동천 일부구간에 설치하여 현장실험으로 수질개선효과를 확인하였다. 몇 차례의 현장실험을 통한 수질개선효과 검증결과는 하천수질의 생활환경기준 검사항목으로 SS, BOD, 총대장균수의 수질 개선효과는 55~83% 감소율을 보여 국내 하천수질 정화시설의 목표치인 60~75%를 상회하는 양호한 것으로 확인되었다.