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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.
A tank cascade is a system of irrigation tanks in single or multiple chains where water from a higher tank flows into lower tanks. Examples of tank cascades include Sri Lanka's tank cascade system , [ 6 ] the Indian city of Bangalore's cascading lakes in the Varthur lake series, [ 7 ] and the Indian city of Madurai 's Vandiyur tank cascade system.
The height of the heavy phase weir can be adjusted in order to position the heavy/light interphase in the settling chamber based on the density of each one of the phases. The settler is a calm pool downstream of the mixer where the liquids are allowed to separate by gravity.
Tilting Weir Animated Schematic. In order to operate, the tilting weir needs to be manually or mechanically opened and closed. Small tilting weirs are operated with hand wheels and electric motors but other methods have been employed especially for larger structures. Tilting weirs are usually controlled by human intervention but a self ...
Tank cascade system diagram, aerial and elevation views. Village tanks and cascades are "naturalized" and generally built with permeable natural materials rather than concreted in place. [21] Tanks can be any size from small vernal pools to huge perennial lakes "thousands of hectares in surface area." [26]
A structure, where a small part of a cylindrical surface serves as the gate, supported by radial constructions going through the cylinder's radius. On occasion, a counterweight is provided. Rising sector sluice gate Also a part of a cylindrical surface, which rests at the bottom of the channel and rises by rotating around its centre. Needle sluice
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A polynomial weir is a weir that has a geometry defined by a polynomial equation of any order n. [11] In practice, most weirs are low-order polynomial weirs. The standard rectangular weir is, for example, a polynomial weir of order zero. The triangular (V-notch) and trapezoidal weirs are of order one. High-order polynomial weirs are providing ...
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