Hydraulics of Enlarging Cannonsville Reservoir

by A. F. Monaco, Ebasco Services Inc, New York, NY, USA,

Document Type: Proceeding Paper

Part of: Engineering Hydrology


This paper describes the hydraulic studies performed for enlarging the Cannonsville Reservoir with a gate system which could raise the normal storage level without having an adverse effect on structures in the reservoir or on the downstream environment. Without special measures, the higher initial level could result in floods encroaching on bridges over the reservoir, and increased flood damage downstream. Measures were devised to avoid these impacts, including a gaging network and flood prediction system to determine appropriate spillway release rates during floods; and conceptual design of a multiple gate system with independent operation to provide the necessary flexibility. To avoid flood releases higher than those under present spillway conditions without encroaching on the bridges, it was necessary to devise three alternative schedules of lowering and raising the gates for use in different ranges of predicted magnitude of floods.

Subject Headings: Hydraulics | Reservoirs | Rivers and streams | Floods | Bridges | Gates (hydraulic) | Water storage | Drop structures

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