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._x000D_ _x000D_ LIBRARIAN'S NOTE: The Tocks Island Dam was never built.


    Access

    Download


    Export, share and cite



    Title :

    Spillway and Outlet Works, Tocks Island Dam, Delaware River, Pennsylvania, New Jersey, and New York: Hydraulic Model Investigation



    Published in:

    Publication date :

    1970


    Size :

    8003895


    Type of media :

    Report


    Type of material :

    Electronic Resource


    Language :

    English



    Classification :


    Burlington Spillway and Outlet Works, Souris River, North Dakota: Hydraulic Model Investigation

    Markussen, Jerry V. / Oswalt, Noel R. | HENRY – Federal Waterways Engineering and Research Institute (BAW) | 1986

    Free access

    Spillway and Outlet Works, Rowlesburg Dam, Cheat River, West Virginia: Hydraulic Model Investigation

    Ables, Jackson H. Jr. / Boyd, Marden B. | HENRY – Federal Waterways Engineering and Research Institute (BAW) | 1970

    Free access

    Gated Spillway for Raystown Reservoir, Juniata River, Pennsylvania: Hydraulic Model Investigation

    Oswalt, Noel R. / Murphy, Thomas E. | HENRY – Federal Waterways Engineering and Research Institute (BAW) | 1970

    Free access

    Grays Landing Spillway and Stilling Basin, Monongahela River, Pennsylvania: Hydraulic Model Investigation

    Rothwell, Edward D. / Oswalt, Noel R. / Maynord, Stephen T. | HENRY – Federal Waterways Engineering and Research Institute (BAW) | 1981

    Free access

    Pompton Dam Spillway, Pompton Lake, Ramapo River Basin, New Jersey: Hydraulic Model Investigation

    Cooper, Deborah R. | HENRY – Federal Waterways Engineering and Research Institute (BAW) | 1991

    Free access