SEDIMENTATION OF DAVE JOHNSTON POWER PLANT INTAKE, GLENROCK, WYOMING, U. S. A.

Abstract

A barrage at the power plant site raises and maintains the water level for diversion purposes. The pool upstream of the barrage traps the sediment inflow, most of which originates from northern hills adjacent to the river. The sediments accumulate in front of the diversion structure and are diverted into the structure causing damage to the pumps and other components of the power plant cooling system. A physical model of the intake area was employed to demonstrate solutions to the problem. Three primary schemes were studied: a gate operation scheme to provide maximum sluicing of the sediment in front of the intake structure; a structural measure to further sluice the sediment away from the intake structure; and geometric alterations to the structure to provide a better flow pattern and less sediment diversion into the power plant.