21st Street Pumping Station, Bettendorf, Iowa, Hydraulic Model Investigation

摘要

A hydraulic model was used to evaluate the hydraulic performance of the 21st Street Pumping Station Sump for the Bettendorf, Iowa, Local Flood Protection Plan. The proposed pumping station consisted of five individual pump bays oriented perpendicular to a box culvert that will provide inflow from two directions. The performance of the original design was characterized by surface and submerged vortices. Surface vortices were eliminated by lowering the sump floor elevation which increased submergence on the pump. Submerged vortices were no longer observed when surface roughness was added to the sump floors and walls. The forebay in the original design was eliminated which provided for considerable economic savings. The design developed as a result of the model investigation operated satisfactorily at different sump water-surface elevations and with various combinations of pumps operating.