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Title: Model study of stilling basin, Delaware Dam, Olentangy River, Ohio
Authors: United States. Army. Corps of Engineers. Ohio River Division
U.S. Army Engineer Waterways Experiment Station
Keywords: Delaware Dam, Ohio
Olentangy River, Ohio
Stilling basins
Hydraulic models
Hydraulic structures
Publisher: U.S. Army Engineer Waterways Experiment Station.
Engineer Research and Development Center (U.S.)
Description: Technical Memorandum
Synopsis: This memorandum constitutes a report on the results of tests conducted at the U.S. Waterways Experiment Station on a model of the Delaware Dam stilling basin. The general purpose vf the tests was to examine the hydraulic performance of the stilling basin as designed by the Cincinnati District Office. An existing 1- to- 60 undistorted scale model of the Conemaugh Dam was used for the tests. Inasmuch as the height and width of the Conemaugh Dam are greater than the Delaware Dam, the height was made to agree by assuming a model- sca.le ratio of 1 to 31 existed; the discharge per foot of width was made to agree with the Delaware conditions. All details of the stilling basin were constructed in accordance with the Delaware Dam drawings to the scale of 1 to 31. As designed bv the Cincinnati District Office, the spillway for the Delaware Dam will be of the ogee type; it will be equipped with six 32-ft gates to regulate the reservoir for flood control. The spillway is designed to pass a maximum discharge of 96,000 cfs uncter a head of 28 ft. As a result of excess tailwater for the formation of a hydraulic jump, two rows of baffle piers and a high end sill will aid in the dissipation of energy and deflection of high velocity current away from the channel bed downstream. The model investigations were concerned solely with the performance of the originally designed stilling basin. No attempts were made to effect refinements to the elements of the stilling basin (baffle pier or end sill height, position, etc.). It was determined from the model tests that the stilling basin as designed was satisfactory. At low discharges the baffle piers destroyed all energy contained in the flow from the spillway while at high discharges the baffle piers in combination with the high end sill created surface and ground rollers which aided in the dissipation of energy and caused erodible material in the exit channel to be washed upstream to the area immediately downstream from the end sill. Although the baffle piers are not a necessity to the safety of the structure, their use improves flow conditions a great deal and their use in the Delaware basin is recommended.
Rights: Approved for public release; distribution is unlimited.
Appears in Collections:Technical Memorandum

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