2. Upstream apron: It protect it during floods from eroding action. Its length depends upon discharge of river and weir's length. It also help to prevent leakage in subsoil and it minimizes uplift water pressure if any exist.
What is Crest in weir?
The weir crest is the upstream element of a pair of boundary elements simulating a weir. The corresponding downstream element is the weir slope.What is a weir trough?
Fiberglass Troughs and weir pans for circular, square, rectangular or custom tanks. The uses are for filtering, thickening, clarification, flocculation, scum removal or back wash. The products are available in NSF/ ANSI 61 certified and AWWA F101 compliant materials and properties.What is gravity weir?
The gravity weir is the weir in which uplift pressure below the weir due to seepage is fully resist by the self weight of the weir. In the case of non-gravity weirs the thickness of the floor is kept relatively small and uplift pressure is largely resist by the bending action of the reinforc concrete floor.What is barrage and components?
Main barrage portion:Main body of the barrage, normal RCC slab which supports the steel gate. In the X-Section it consists of : Upstream concrete floor, to lengthen the path of seepage and to project the middle portion where the pier, gates and bridge are located.
Weirs and Launching Apron
What is Crest in barrage?
The crest level in the barrage (top of solid obstruction) is kept at low level. During flood, gates are raised to clear of the high flood level. As a result there is less silting and provide better regulation and control than the weir.What is pond level in weir?
(vii) Pond Level:The weir stores water on its upstream side in front of a head regulator to create a still pond. The canal gets water from this pond through the head regulator . Hence, it is essential to keep the level of the pond some 0.75 to 1 m above the FSL of the canal to provide sufficient working head.
What is weir length?
The Length is the bottom width of the weir. The height is measured from the bottom of the weir opening to the top of the water level ponded behind the weir (not the water level right as it leaves the weir).What are under sluices?
: a sluice covered from view or lying beneath another structure specifically : a wasteway for sluicing out canals in which the waste escapes beneath other structures.What is vertical drop weir?
ADVERTISEMENTS: Vertical drop weir is such a weir, whose D/S face is given steep batter. The U/S face is mostly vertical, but it can also be given batter like D/S face.What is weir overflow?
A weir is an overflow structure that is used to alter flow characteristics. In the example below, the water is flowing from left to right. The black triangular-shaped structure is the weir. It is impeding the flow of water causing the water to flow over the weir structure.What is notch and weir?
A notch is an opening in the side of a measuring tank or reservoir extending above the free surface. A weir is a notch on a large scale, used, for example, to measure the flow of a river, and may be sharp edged or have a substantial breadth in the direction of flow.What is weir diameter?
weir diameter (weer)The diameter of the weir is the length of a line from one edge of a weir to the opposite edge and passing through the center of the circle formed by the weir.
