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Detention ponds that are designed to permanently retain some volume of water at all times are called retention basins. In its basic form, a detention basin is used to manage water quantity while having a limited effectiveness in protecting water quality , unless it includes a permanent pool feature.
Another variant [6] is when one of the jugs has a known volume of water to begin with; In that case, the achievable volumes are either a multiple of the greatest common divisor between the two containers away from the existing known volume, or from zero. For example, if one jug that holds 8 liters is empty and the other jug that hold 12 liters ...
Tunnels may be cheaper than basins, as they do not require pumps to move the water. [6] The outlet is generally a restricted-flow drain from the detention vessel, with a weir for containing detritus. [3] Detention vessels delay water's delivery downstream, and possibly creates a later water level peak post-rainfall.
The lake retention time for a body of water with the volume 2,000 m 3 (71,000 cu ft) and the exit flow of 100 m 3 /h (3,500 cu ft/h) is 20 hours.. Lake retention time (also called the residence time of lake water, or the water age or flushing time) is a calculated quantity expressing the mean time that water (or some dissolved substance) spends in a particular lake.
A discharge is a measure of the quantity of any fluid flow over unit time. The quantity may be either volume or mass. Thus the water discharge of a tap (faucet) can be measured with a measuring jug and a stopwatch. Here the discharge might be 1 litre per 15 seconds, equivalent to 67 ml/second or 4 litres/minute. This is an average measure.
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
Sep. 18—HARLINGEN — The city's new drainage crew along with millions in grant-funded upgrades are helping to curb flooding amid late summer rains. Last year, city commissioners approved ...
Overflow rate (v o) = Flow of water (Q (m 3 /s)) /(Surface area of settling basin (A(m 2)) In many countries this value is named as surface loading in m 3 /h per m 2. Overflow rate is often used for flow over an edge (for example a weir) in the unit m 3 /h per m. The unit of overflow rate is usually meters (or feet) per second, a velocity.