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A spillway is located at the top of the reservoir pool. Dams may also have bottom outlets with valves or gates which may be operated to release flood flow, and a few dams lack overflow spillways and rely entirely on bottom outlets. Cross-section of typical spillway with Tainter gates. The two main types of spillways are controlled and uncontrolled.
An air gap, as related to the plumbing trade, is the unobstructed vertical space between the water outlet and the flood level of a fixture. [1] Air gaps of appropriate design are legally required by water health and safety regulations in many countries. An air gap is the simplest form of a backflow prevention device.
Storm water is typically channeled to a retention basin through a system of street and/or parking lot storm drains, and a network of drain channels or underground pipes.. The basins are designed to allow relatively large flows of water to enter, but discharges to receiving waters are limited by outlet structures that function only during very large storm eve
A common distinction between dams and weirs is that water flows over the top (crest) of a weir or underneath it for at least some of its length. Accordingly, the crest of an overflow spillway on a large dam may therefore be referred to as a weir. Weirs can vary in size both horizontally and vertically, with the smallest being only a few ...
There are four main components of a chute spillway: [1] The elements of a spillway are the inlet, the vertical curve section (ogee curve), the steep-sloped channel and the outlet. In order to avoid a hydraulic jump , the slope of the spillway must be steep enough for the flow to remain supercritical.
The dam structure contains a concrete spillway on its left side capable of discharging overflow at 107,000 cubic feet per second (3,000 m 3 /s). The spillway is controlled by two 45 x 30 ft (15 x 6 m) Tainter gates while an outlet tunnel at the base of the dam is controlled by two 10 x 12 ft (3 x 4 m) Tainter gates.
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