Structure for controlled release of flows from a dam or levee
"Spillways" redirects here. For the song by Ghost, see Impera.
Chute spillway of Llyn Brianne dam in Wales
A spillway is a structure used to provide the controlled release of water downstream from a dam or levee, typically into the riverbed of the dammed river itself. In the United Kingdom, they may be known as overflow channels. Spillways ensure that water does not damage parts of the structure not designed to convey water.
Spillways can include floodgates and fuse plugs to regulate water flow and reservoir level. Such features enable a spillway to regulate downstream flow—by releasing water in a controlled manner before the reservoir is full, operators can prevent an unacceptably large release later.
Other uses of the term "spillway" include bypasses of dams and outlets of channels used during high water, and outlet channels carved through natural dams such as moraines.
Water normally flows over a spillway only during flood periods, when the reservoir has reached its capacity and water continues entering faster than it can be released. In contrast, an intake tower is a structure used to control water release on a routine basis for purposes such as water supply and hydroelectricity generation.
A spillway is a structure used to provide the controlled release of water downstream from a dam or levee, typically into the riverbed of the dammed river...
The Morganza Spillway or Morganza Control Structure is a flood-control structure in the U.S. state of Louisiana. It is located along the western bank of...
February 2017, heavy rainfall damaged Oroville Dam's main and emergency spillways, prompting the evacuation of more than 180,000 people living downstream...
emergency spillways threatened to fail, leading to the evacuation of 188,000 people living near the dam. After deterioration of the main spillway largely...
downstream. The dam is noted for its classic, uncontrolled morning-glory-type spillway. The diameter at the lip is 72 ft (22 m). To the south is Putah Creek State...
thotapally spillway 'Thottappally Spillway is Kuttanad's drain-way out to the Arabian Sea. The Thottappally Spillway splits the Thottappally lake with...
A stepped spillway is a spillway with steps on the spillway chute to assist in the dissipation of the kinetic energy of the descending water. This eliminates...
Open channel spillways are dam spillways that utilize the principles of open-channel flow to convey impounded water in order to prevent dam failure. They...
dam known as Banasurasagar Dam, an earth fill dam and a concrete gravity spillway dam and six saddle dams namely, a) Kosani ( Earth fill dam) 13.8 m high...
The Red River Floodway (French: Canal de dérivation de la rivière Rouge) is an artificial flood control waterway in Western Canada. It is a 47 km (29 mi)...
over-topping by two spillways. The spillway entrances are located behind each dam abutment, running roughly parallel to the canyon walls. The spillway entrance arrangement...
through the spillway. There are several types of spillway. A "service spillway" or "primary spillway" passes normal flow. An "auxiliary spillway" releases...
The Pequannoc Spillway is a run-of-the-river spillway constructed in the 1920s as part of the Morris Canal system in the Pompton Plains section of Pequannock...
the main dam, a saddle dam, and an auxiliary dam located with the spillway. The spillway is a chute-type controlled by three radial gates but equipped with...
Spillway in Louisiana, which direct excess water down the west and east sides (respectively) of the Atchafalaya River; and the Bonnet Carré Spillway,...
topped out. Work on the power plant and spillways began directly after the dam wall was complete. The spillway tunnels were excavated around both abutments...
Civilian Conservation Corps by damming the creek. The stone Charlton Dam and Spillway, about 100 feet (30 m) in length, was listed on the National Register of...
the upper Colorado River that led to extended use of its tunnel spillways. The spillways, designed for short-term use, soon underwent cavitation and began...
Basin Bridge on I-10, the Louisiana Highway 1 Bridge, the Bonnet Carré Spillway Bridge on I-10, the Chacahoula Swamp Bridge on U.S. 90, the Lake Pontchartrain...
emergency spillway prompted an evacuation of downstream residents. Phase 1 of emergency spillway repairs was completed in 2017. The main spillway was successfully...
An ungated spillway, the auxiliary spillway, sits at the center of the main dam with an open width of about 205 m (673 ft). This spillway has a base-level...
Mississippi federal disaster areas. For the first time in 37 years, the Morganza Spillway was opened on May 14, deliberately flooding 4,600 square miles (12,000 km2)...
600 m (1,969 ft) Dam volume 9,100,000 m3 (11,902,351 cu yd) Spillway type Morning glory Spillway capacity 3,000 m3/s (105,944 cu ft/s) Reservoir Total capacity...
on spillways in dams to increase the dam's capacity. The principle behind the fuse plug is that the majority of water that overflows a dam's spillway can...
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