In the summer months the spillway of the dam is opened for a few minutes daily and tourists gather to see the water rushing down the river ( picture ).

The design of dams must also account for the worst-case, " probable maximum flood " that can be expected at the site ; a spillway is often included to bypass flood flows around the dam.

An emergency spillway is designed for extreme conditions, such as a serious malfunction of the service spillway.

A fuse plug spillway is a low embankment designed to be over topped and washed away in the event of a large flood.

Erosion rates are often monitored, and the risk is ordinarily minimized, by shaping the downstream face of the spillway into a curve that minimizes turbulent flow, such as an ogee curve.

Another example is the ogee curve as used in the spillway of some dams.

The only danger in the area is the spillway which is a tower that raises about off the water.

In warm weather, the spillway on the sanctuary ( eastern ) side is home to thousands of oversized carp, attracted by the bread thrown into the water by visitors ; this is known as " The Place Where the Ducks Walk on the Fish ", coined by local businessman Alpine Maclaine.

The spillway section of the dam is long.

A major spillway upgrade is now finished which will facilitate these flows.

Today, the town is home to most of the Windsor Dam and its spillway, and the Goodnough Dike, both of which lie within the Quabbin Reservation.

The crest of an overflow spillway on a large dam is often called a weir.

Each spillway is controlled by two long, high radial gates and is capable of carrying for a combined capacity of.

Also, the downstream face of a dam spillway is usually formed in an ogee curve to minimize water pressure.

Its reservoir is named Priest Rapids Lake, and extends 18 miles upstream to spillway of Wanapum Dam.

The dam wall is constructed of rock covered with clay and other earth, with a concrete spillway.

It is fed by the north and south forks of the Upper Great Miami River, Cherokee Mans Run, Blackhawk Creek, and Van Horn Creek, and, starting at the bulkhead or " spillway " ( located at what is now State Route 366 ) built in the 1850s by Irish laborers, is the beginning of the Great Miami River.

South of the small lock is a spillway dam with tainter gates used to regulate the freshwater levels of the ship canal and lakes.

At the southern end of this section, Foxwood Isle separates the main dam to its west and a spillway to the east.

The existing spillway is considered structurally deficient and the results of the most recent inspection indicate that the current structure has experienced advanced section loss, deterioration, spalling and scour.

The existing spillway is considered structurally deficient and the results of the most recent inspection indicate that the current structure has experienced advanced section loss, deterioration, spalling and scour.

The main components of the project, as built, are, a ) the Ithai barrage, across the Manipur river of height and length with three spillway bays, b ) water conductor system for trans-basin diversion comprising an open channel of length, a cut and cover section of length ( bed width, followed by a Head Race Tunnel of diameter ( horseshoe type ) and long to carry a discharge of () for power generation and for irrigation ), c ) a surge shaft, d ) penstocks and e ) a surface powerhouse and a tailrace channel on the right bank of the narrow Leimatak River with three units of 35 MW capacity each generating an annual energy of 448 GW · h ( 1. 613 PJ ).

For this purpose, three earthen embankment dams with a masonry spillway section were constructed to create a reservoir of 9200 million gallons capacity at the full reservoir level of 80. 42 metres.

In 1973 the non-overflow portion of the dam was strengthened, followed by strengthening the spillway section in 2006.

Cross section of a spillway

The spillway in the concrete section is wide.

Two smaller wide and tall gates on the outer edges of the spillway section maintain normal discharges.

It will consist of polystyrene-faced rockfill dams on each river bank, an earth-rock dam with a pepper core in the left river channel and a live water section in the right river channel ( sluices, spillway and power intake dam with turbine housings ).

The spillway section contains ten 15m x 11m tainter gates and six 1. 2m x 1. 8m low level sluice gates.

In this form of construction the majority of the dam ’ s structure ( measured by length across the streambed ) is a nominally waterproof earth fill embankment body, with only the powerhouse and ( if so equipped ) the controlled overflow spillway section located within a concrete monolith.

An improvised system, placing large pipes over the spillway to siphon water over it, was soon installed, but the inflow from an unusually wet spring was such that the dam would have overflowed anyway, leading to a spectacular cascade over the huge rock steps formed when the rock used for the dam itself was quarried from the valley walls.

The National Park surrounds Lake Moogerah, and access to the Mount Edwards portion of the park can be had across the dam wall and spillway of the lake.

In 1942, the company installed 24 gates at the top of the dam to raise the spillway elevation five feet, increasing the reservoir size to 800 million gallons.

The spillway tunnels were excavated around both abutments of the dam and drop steeply from their control gates on Lake Powell to merge with the lower ends of the diversion tunnels.

At the beginning of June dam operators opened the gates on the left spillway, sending, just 7. 2 % of capacity, down the tunnel into the river below.

The high dam was approved by Congress in 1935 and completed in 1942 ; the first water over-topped its spillway on of that year.

The dam after completion and water over-topping the spillway

The changes included lowering the dam to make its top wide enough to hold a road, and putting a fish screen in the spillway ( that also trapped debris ).

Unger quickly assembled a group of men to try to save the face of the dam by trying to unclog the spillway which was blocked by the broken fish trap and debris caused by the swollen waterline.

Other men tried digging another spillway at the other end of the dam to relieve the pressure, without success.

Features of the system include of levees, a floodwall in downtown, and a diversion channel with a dam at one end and a spillway at the other.

As originally designed, the dam could safely withstand a peak inflow of 500, 000 cusec ( approximately 14Ml / sec ), leading to a peak discharge of 354, 000 cusec or 10, 000 tonnes / sec down the spillway.

Following a 1987 and 1989 re-evaluation of the potential rainfall and flood risks, the government raised the dam wall by and constructed an auxiliary spillway on the east bank of the dam.