Lake Berryessa was formed when
the Bureau of Reclamation built Monticello Dam on Putah Creek in 1957. Project purposes included flood control,
municipal and industrial water supply, and irrigation water supply. Lake
Berryessa is located in northern California; the Monticello Dam's is the
largest Hydroelectric Power Plant is owned and operated by the Solano
Irrigation District.
The Morning Glory Spillway (Glory
Hole) is the funnel-shaped outlet that allows water to bypass the dam. This
funnel-shaped outlet lets water to bypass the dam when it reaches to its
maximum capacity (1,602,000 acre-feet), as it swallows a rate of 48,400 cubic
feet per second (1370 m³/s). The distance from the funnel to the exit point is
situated in the south side of the canyon approximately 700 feet. This kind of spillway is mainly a massive
cement funnel.
The Hole’s narrows diameter is 28
feet and largest diameter is 72 feet. For some clear reasons, swimming near the
glory hole is prohibited. There’re buoys strung across the lake to stop boaters
and swimmers from approaching the glory hole and the dam. Moreover, the glory
hole is well fenced off from the land.
The Lake Berryessa Recreation area is Federally-owned, public land
administered by Reclamation. The name of Berryessa is from two brothers with
the last name of Berryessa. The
brothers, Jose Jesus and Sisto Berryessa, owned a considerable portion of the
land in and around the town of Monticello, now covered by the waters of Lake
Berryessa.
A spillway is a structure used to
provide for the controlled release of flows from a dam or levee into a
downstream area, typically being the river that was dammed. Spillways release
flood water due to security reasons not overtop, damage & destroy the dam.
It is normally used in rain seasons or flood periods when water doesn’t flower
over a spillway. Moreover; to release water on a regular basis for water supply,
hydroelectricity generation, etc. Floodgates and fuse plugs may be designed
into spillways to regulate water flow and dam height. The other uses of “spillway” include bypasses
of dams or outlets of a channels used during highwater, and outlet channels carved
through natural dams such as moraines.