Shaft Spillway

shaft spillway

[′shaft ′spil‚wā]
(civil engineering)
A vertical shaft which has a funnel-shaped mouth and ends in an outlet tunnel, providing an overflow duct for a reservoir. Also known as morning glory spillway.

Shaft Spillway

 

in hydrotechnics, an automatic tubular spillway used chiefly to discharge excess water from reservoirs with dams, from canals, and from the head basins of hydroelectric power plants. The inlet of a shaft spillway is usually flared and is submerged below the level of the head in order to prevent the entrapment of air, litter (such as driftwood), and ice. The advantages of a shaft spillway include the large carrying capacity and the feasibility of constructing the spillway after the main construction has been completed, for instance, in the event it becomes necessary to expand the spillway facilities.

Mentioned in ?
References in periodicals archive ?
Limited Tenders are invited for Cleaning And Painting Winch Machine And Support Structure Of Shaft Spillway, Hoist And Platform Of Ilo And Gantry Crane Of Chute Spillway
Shaft spillway is one of the spillway types used to pass additional waters and floods from the upstream to the downstream of dams.
Keywords: Shaft spillway, Discharge coefficient, Submergence, flow pattern
Shaft spillway is a spillway composed of a circular crest that directs the flow to an inclined or vertical axis, which is connected to a low gradient tunnel.
Shaft spillway in such dams is a good option in flood discharge.
In this study, the effect of the sharp triangular vortex breaker blade with rectangular body on the efficiency of discharge in shaft spillway is studied.
To compare sharp triangular vortex breaker blades with rectangular body according to Figures (2) and (3) on the efficiency of the discharge of shaft spillway, 6 vortex breakers in three different lengths of 10, 15 and 20% of the overflow diameter with a thickness of 2 cm and a height of 4 cm m are used.
bigger cracks, deformation, tilt in shaft spillway 33 ED (12.
The same amount of deformation, tilt in shaft spillway has been registered in Lithuanian dams (12.
According to importance of these spillways in dikes which the possibility of showing other spillway is expensive and impossible, using strategies to increase discharge and discharge coefficient of shaft spillway is so important, and also making the best use of effective parameters can have more effect on increasing discharge and discharge coefficient of shaft spillways.
The closed conduit system on a shaft spillway is in lieu of the open channel chute used on conventional spillways.
Through experimental investigation of the effect of the bend arc radius on shaft spillway flow hydraulic, Youssefvand et al.