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Title: Yazoo Backwater Pumping Station sump, West-Central Mississippi : hydraulic model investigation
Authors: United States. Army. Corps of Engineers. Vicksburg District
Fletcher, Bobby P.
Keywords: Flow
Flow distribution
Formed suction intake
Suction bell
Hydraulic structures
Flood control
Hydraulic models
Pumping stations
Yazoo Backwater Pumping Station
Mathematical models
Numerical models
Publisher: Hydraulics Laboratory (U.S.)
Engineer Research and Development Center (U.S.)
Series/Report no.: Technical report (U.S. Army Engineer Waterways Experiment Station) ; HL-90-8.
Description: Technical Report
Abstract: Numerical and physical hydraulic model tests were conducted to investigate the hydraulic performance of the Yazoo Backwater Pumping Station approach channel, sump abutments, and sump. The numerical model was used as a tool for evaluating and screening various approach channel designs prior to testing in the physical models. Physical model tests were conducted in a 1:12.5-scale section model and a 1:26-scale comprehensive model. A variety of operating conditions with various water-surface elevations were evaluated. In the section model, tests indicated that the intensity of the floor vortices increased as the suction bell was moved closer to the floor. Various configurations of approach training walls were evaluated in the section model. In the 1:26-scale model, comprehensive tests were initially conducted to investigate hydraulic performance in a 15-pump, 17,500-cfs-capacity pumping station. Asymmetrical pump operation generated lateral flows in the approach channel, which generated adverse flow distribution in the pump bays. Tests indicated that a streamlined pump intake design compensated for adverse flows in the approach. At the request of the US Army Engineer District, Vicksburg, the capacity of the pumping station was reduced from 17,500 to 10,000 cfs. Hydraulic performance with the 10,000-cfs station was similar to that observed in the 17,500-cfs station. Tests were conducted to refine the design of the streamlined sump by investigating various pump bay widths. Test results indicated that the punp bay widths could be reduced from 28 to 23 ft if vortex suppressor beams were installed in the pump bays. The adopted design developed from the model study should provide satisfactory hydraulic performance for anticipated flow conditions.
Rights: Approved for public release; distribution is unlimited.
Appears in Collections:Technical Report

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