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oa Civil Engineer in South Africa - Design of a 500 M shallow balancing reservoir

 

Abstract

The 500 M terminal reservoir (forebay) at the end of the Zuikerbosch canal presented a number of challenging design problems. The forebay is utilized as balancing storage between the Zuikerbosch Canal and the Rand Water Board's large water treatment plants. The problems derived from the shallow water depth and from the embankment foundations which comprised collapsing aeolian sands overlying permeable and active alluvial clays.


The cost of lining the 20 ha of the storage forebay with concrete, bentonite or plastic lining would have been exorbitant so a puddled in-situ compacted clay layer was used to seal the floor.
The design of the inlet, outlet and spillway structures was complicated by the shallow water depth and the rapid rate of draw-down in the reservoir. The performance of the structures has been satisfactory.

Die ontwerp van die 500 M terminale reservoir aan die einde van die Zuikerbosch-kanaal het met 'n aantal uitdagende probleme gepaard gegaan. Die reservoir word vir balanserende opgaring tussen die Zuikerboschkanaal en die Randse Waterraad se groot watersuiweringswerke gebruik. Die probleme was weens vlak water en walfondamente op windgedeponeerde swigsand wat oor waterdeurlatende bewegende spoelklei geleë is.


Om die 20 ha voorbekken met beton, betontoniet of plastiek uit te voer, sou buitensporig duur wees en gevolglik is 'n in-situ gekompakteerde stopkleilaag gebruik om die vloer te verseël.
Die vlak water en die hoë dalingstempo van die reservoir se watervlak het die ontwerp van die inlaat, uitlaat- en oorloopstruktuur bemoeilik. Die strukture werk bevredigend.

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/content/civeng1/26/10/EJC24935
1984-10-01
2016-12-04
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