The model study was conducted to evaluate the characteristics of flow in the inlet channel, original sump, energy dissipater (saxophone outlet), and outlet channel and to develop practical modifications required for improving the hydraulic performance of the structure. Hydraulic performance of the original design inlet channel and sump was satisfactory for all anticipated sump elevations with various numbers and combinations of pumps operating. This was attributed to the relatively long and straight approach channel to the sump, the relatively long pumping bays, and the high submergence on the pumps at the minimum anticipated sump elevation. Tests conducted to investigate various size bell diameters indicated that for the range of bell diameters evaluated, there was no significant difference in the performance of flow entering the suction bell. Hydraulic performance of the outlet structure and stability of the riprap in the outlet channel were improved by the addition of minor modifications developed during the model study. Tests results indicated that the critical hydraulic conditions occurred with one pump operating and the basin initially dry. Flows from both the 45- and 90-degree discharge outlets passed over the original 20-ft-long stilling basin and impinged on the invert of the riprap-protected exit channel; therefore the stilling basin length was increased to 50 ft. The stilling basins vertical sides were replaced with 1V-on-3H paved slopes for economic reasons. The riprap thickness on the exit channel side slopes was increased from 18 to 24 in. to ensure rock stability for all anticipated flow conditions.
Pumping Station for Teche-Vermilion Basins, Atchafalaya River, Louisiana: Hydraulic Model Investigation
Technical Report ; HL-80-6
1980
5308559
Report
Electronic Resource
English
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