The water upstream from the powerhouse, or generally, the water upstream from any hydraulic structure creating head
(1) The source and upper reaches of a stream; also the upper reaches of a reservoir (2) The water upstream from a structure or point on a stream (3) The small streams that come together to form a river Also may be thought of as any and all parts of a river basin except the mainstream river and main tributaries
The small rivulets that are the source of a stream or river Mapped as the last crenulation in a contour line below a ridge or crest on a topographic map
but when his brows began to wrinkle with time, and he stood alone, the last of his family, and his particular tribe, the few Delawares, who yet continued about the head-waters of their river, gave him the mournful appellation of Mohegan.
The source and upper reaches of a stream, also the upper reaches of a reservoir, the water upstream from a structure or point on a stream, the small streams that come together to form a river, any and all parts of a river basin except the mainstream river and main tributaries