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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 ...
Broad crested weir: Spillway capacity: 5,358 cubic feet per second (151.7 m 3 /s) Upper reservoir; Total capacity: 4,350 acre-feet (5,370,000 m 3) [6] Surface area: 54.5 acres (22.1 ha) Maximum water depth: 120 feet (37 m) Normal elevation: 1,597 feet (487 m) Lower dam and spillways; Type of dam: Gravity dam: Impounds: East Fork Black River ...
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.
The greater lock is against the general south (right, towpath or Surrey) bank of the river which is for 500 m north-east here [n 2]; a middle lock being that most regularly used spans a long thin island which has lawns, places for boat owners to sit and a lock keeper's cabin and short thin island which is a thin wedge of concrete and a broad canoe/kayak stepped portage facility.
ISO 8333:1985 Liquid flow measurement in open channels by weirs and flumes – V-shaped broad-crested weirs; ISO 8343:1985 Ferronickel - Determination of silicon content - Gravimetric method; ISO/IEC 8348:2002 Information technology – Open Systems Interconnection – Network service definition; ISO 8362 Injection containers and accessories
Some varieties of flumes are used in measuring water flow of a larger channel. When used to measure the flow of water in open channels, a flume is defined as a specially shaped, fixed hydraulic structure that under free-flow conditions forces flow to accelerate in such a manner that the flow rate through the flume can be characterized by a level-to-flow relationship as applied to a single head ...
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The tilting weir has its origins in the 19th century drum weir which functions using the same principles as the 20th century design. The drum weir, was for a long time confined to the River Marne, where it was first introduced in 1857. [5] Early tilting weirs were constructed from wrought iron and wood.