1) Waterwheel reservoir 
[reservoir] A forebay is an artificial pool of water in front of a larger body of water. The larger body of water may be natural or man-made. Forebays have a number of functions. They are used in flood control to act as a buffer during flooding or storm surges, impounding water and releasing in a controlled way into the larger waterbody. Th...
The part of a dam's reservoir that is immediately upstream from the powerhouse.
The part of a dam's reservoir that is immediately upstream of the powerhouse.