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Sunday, April 29, 2012

Spillways around the world

Spillways around the world
SPILLWAYS

- 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 floods so that the water does not overtop and damage or even destroy the dam. Except during flood periods, water does not normally flow over a spillway
- In contrast, an intake is a structure used 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
- Other uses of the term “spillway” include bypasses of dams or outlets of a channels used during highwater, and outlet channels carved through natural dams such as moraines.

BELL-MOUTH SPILLWAYS
- Some spillways are designed like an inverted bell so that water can enter all around the perimeter. These uncontrolled spillway devices are also called: morning glory, plughole, glory hole, or bell-mouth spillways
- In areas where the surface of the reservoir may freeze, bell-mouth spillways are normally fitted with ice-breaking arrangements to prevent the spillway from becoming ice-bound.

LADYBOWER RESEVOIR
- The images below are from the spillways located at the Ladybower Resevoir
- The Ladybower Reservoir is a large Y-shaped reservoir, the lowest of three in the Upper Derwent Valley in Derbyshire, England
- The River Ashop flows into the reservoir from the west; the River Derwent flows south, initially through Howden Reservoir, then Derwent Reservoir, and finally through Ladybower Reservoir
- Its longest dimension is just over 3 miles (5km), and at the time of construction it was the largest reservoir in Britain (1943).
Bellmouth overflow in Lady bower reservoir in Derbyshire.








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