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Development of Scour Channel After Spillway Failure

by Misganaw Demissie, Illinois State Water Survey, Champaign, IL, USA,
Vassilios Tsihrintzis, Illinois State Water Survey, Champaign, IL, USA,
William C. Bogner, Illinois State Water Survey, Champaign, IL, USA,
Nani G. Bhowmik, Illinois State Water Survey, Champaign, IL, USA,



Document Type: Proceeding Paper

Part of: Hydraulic Engineering

Abstract:

In November 1985 parts of the spillway which controlled the water level in Lake Charleston failed during a moderate flood event. The spillway failure resulted in formation of a large 'sinkhole' (scour hole) at the upstream side of the spillway. The sinkhole gradually migrated upstream from the spillway to the diversion channel, which is very close to the dike in several places. The upstream migration of the scour hole formed a deep channel much lower than the original lake bottom. The portion of the old lake outside the side channel reservoir was drained, with the streamflow confined in the new channel. This exposed the pump intake used to supply water to the side channel reservoir and threatened the stability of the side channel reservoir dike. This paper presents the results of a hydraulic study which included field data collection and mathematical modeling to investigate the development of the scour channel and the problems associated with it.

Subject Headings: Spillways | Channels (waterway) | Scour | Hydraulic models | Mathematical models | Field tests | Water intakes

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