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Title: Spillway and outlet works, Tocks Island Dam, Delaware River, Pennsylvania, New Jersey, and New York : hydraulic model investigation
Authors: United States. Army. Corps of Engineers. Philadelphia District.
Melsheimer, Edwin S.
Keywords: Hydraulic models
Hydraulic structures
Outlet works
Stilling basins
Tocks Island Dam
Delaware River
Publisher: Hydraulics Laboratory (U.S.)
Engineer Research and Development Center (U.S.)
Series/Report no.: Technical report (U.S. Army Engineer Waterways Experiment Station) ; H-70-10.
Description: Technical Report
Abstract: The spillway for Tocks Island Dam was studied on a 1:60-scale comprehensive model and a 1:64-scale spillway model to determine flow conditions in the approach and exit channels and the performance of various elements of the structure. Modifications to both abutments were required to correct unequal distribution of flow that caused considerable turbulence and drawdown in the spillway bays adjacent to the abutments. The expected capacity of the spillway was not adversely affected by the turbulence at the abutments and reducing the approach elevation from 382 to 372 was not justified merely to increase discharge capacity. The surging phenomenon observed in the gate bays at the larger gate openings was eliminated by maintaining a minimum bay width not less than 1.2 times the controlled head on the spillway, or about 53.5 ft in the six-bay spillway. The original spillway chute was modified to achieve reduction in cost without sacrificing hydraulic performance. To provide acceptable basin action the original basin had to be lowered 10 ft in elevation. The recommended stilling basin utilized a 204-ft-long apron at el 271.5 surmounted by two rows of 12-ft-high baffle piers and an 8.5-ft-high end sill. Tests also indicated that the 12- on-1 battered stilling basin walls were the most satisfactory and replacing the downstream right quadrant wall with a 100- or 150-ft straight extension to the wall afforded more protection to the riprap in the vicinity of the wall. It was determined that riprap protection is required along the downstream toe of the right embankment. LIBRARIAN'S NOTE: The Tocks Island Dam was never built.
Rights: Approved for public release; distribution is unlimited.
Appears in Collections:Technical Report

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