Search results
Results from the WOW.Com Content Network
The broad crested weir at the Thorp grist mill in Thorp, Washington, US. Commonly, weirs are used to prevent flooding, measure water discharge, and help render rivers more navigable by boat. In some locations, the terms dam and weir are synonymous, but normally there is a clear distinction made between the structures. Usually, a dam is designed ...
In hydraulic engineering, a nappe is a sheet or curtain of water that flows over a weir or dam. The upper and lower water surface have well-defined characteristics that are created by the crest of a dam or weir. [1] Both structures have different features that characterize how a nappe might flow through or over impervious concrete structures. [2]
The hydrology of the Braden River was altered in 1936 when the city of Bradenton created Ward Lake, a reservoir with an 838-foot (255 m) broad-crested weir 6 miles (9.7 km) upstream from the mouth. In 1985 the reservoir was expanded and supplies an annual average of 5.7 million US gallons (22,000 m 3 ) of water per day.
Stream gauge B62, a combination weir at Doddieburn, on the Mzingwane River, Zimbabwe. A variety of hydraulic structures / primary device are used to improve the reliability of using water level as a surrogate for flow (improving the accuracy of the rating table), including: Weirs. V-notch, broad-crested, sharp-crested and; combination weirs; Flumes
The dam's spillway is a broad-crested weir about 600 feet (180 m) long with a capacity of 17,000 cu ft/s (480 m 3 /s). [12] The dam diverts water into the 13.7-mile (22.0 km) Leasburg Canal, which irrigates 31,600 acres (12,800 ha) of land in the upper Mesilla Valley.
The flow over a stepped spillway may be divided into three distinct flow regimes depending on the flow rate for a given stepped spillway geometry: nappe, transition, and skimming flow regimes with increasing flow rates. [3] For a given stepped spillway geometry, the nappe flows are observed for small discharges.
The low dam is designed to help manage floods.
A drop structure, also known as a grade control, sill, or weir, is a manmade structure, typically small and built on minor streams, or as part of a dam's spillway, to pass water to a lower elevation while controlling the energy and velocity of the water as it passes over.