Indian Creek Pumping Station, Mankato,Minnesota,Hydraulic Model Investigation.

摘要

The model study was conducted to evaluate the characteristics of inflow to the original design gravity-flow section and pump sump and to develop modifications required for improving the distribution of flow to the gravity-flow section and pump intakes. The 1:10-scale model indicated the need for certain minor modifications to improve flow characteristics in the forebay and ensure satisfactory flow characteristics and pressures near the pump intakes. The major problems encountered at the pump intakes were generated by the concentrated jet entering and passing through the forebay. The concentrated jet produced adverse currents and turbulence near the pump intakes. Satisfactory approach flows were obtained by installing divider walls to isolate each pump. The major problems encountered at the entrance to the gravity-flow section were generated by the abrupt transition from the forebay to the gravity-flow section. The problems were alleviated by streamlining the entrance to the gravity-flow section. The improved flow conditions at the entrance to the gravity-flow section reduced the severe drawdown at the right abutment and provided a more direct route for flow to enter the gravity-flow section.