A spillway is a structure used to provide the controlled release of flows from a dam or levee into a downstream area, typically the riverbed of the dammed river itself. In the United Kingdom, they may be known as overflow channels. Spillways ensure that the water does not overflow and damage or destroy the dam. Floodgates and fuse plugs may be designed into spillways to regulate water flow and reservoir level.
The Weir Reservoir Overflow spillway is feet long drilled through solid rock. The Sprague and Henwood, Inc. The rock cuts were lined with granite and masonry blocks along the channel. The weir, or spillway is on the north side of the valley. It starts upstream at approximate right angles to the center line of the dam and proceeds eastward, or upstream, on a curve. The water flows into the weir channel and flows down the inclined tunnel or glory hole into the Diversion Tunnel.
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They look harder to build and maintain than just having a section of the dam that is designed to let water spill over once it reaches a certain level.. Spillway drain in monticello dam, napa valley california nature national geographic australia — national geographic. Glory hole. The glory hole spillway at monticello dam running again in the spring of after a.