Surges in Southern Outfall Sewer and Flow Conditions in State Fairgrounds (Western Parkway) Pumping Plant, Louisville, Kentucky; Hydraulic Model Investigation
Abstract
Model investigations of the surges occurring in sewer lines and of the flow conditions in a typical pumping plant, used to dispose of drainage during high river stages, were conducted as a part of the local flood protection project for Louisville, Kentucky. Studies conducted on a 1:32- scale simplified model of the Southern Outfall Sewer provided general information on the relative amount of relief from surges to be expected from the pumping station and manholes in the sewer line upstream. It was determined that the open sump absorbed all water-hammer effects with no increase in pressure occurring upline from the sump. It also was determined that the time of valve closure (pump stoppage) had little effect upon the maximum height of surge rise. A decrease in the size of the sump increased the maximum height of rise; an increase in the area of the risers had little or no effect on the height of rise, although increasing the area greatly lengthened the time of rise. The height of surge upline was reduced by allowing one of the lower manholes to be overtopped and the excess water to go into storage above ground. The time of concentration tests indicated that with a surcharged sewer the time of travel of an additional increment of water from the point of entry to the point of exit was practically instantaneous; whereas, with a sewer flowing partially full, the additional increment traveled with the normal velocity of the water, thus greatly increasing the time of concentration of flow at the lower end of the sewer. The above studies provided data that formed the basis for a comprehensive analysis of the surge problem in sewers.
Document Details
- Document Type
- Technical Report
- Publication Date
- Jun 01, 1954
- Accession Number
- ADA637667