Effects of Approach Flow Conditions on Pump Sump Design

An important obstacle to the development of a generalized sump design is the variability of flow conditions in approach areas. The geometry and alignment of the areas immediately upstream of the sumps are so closely tied to the requirements of the specific site that it is virtually impossible to standardize their design. Flow conditions in approach areas, therefore, have to be evaluated on a case by case basis to determine their impact on the hydraulic performance of the respective pump sumps. This paper presents a case study of one particular sump design, developed through hydraulic model testing, which was highly dependent on approach flow conditions. The case study illustrates the effect on hydraulic performance and sump configuration of several design features and site constraints prevalent in approach areas. The study concludes that significant deviations from current design practices will be required to attain a generalized sump design.