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A rainwater catchment or collection (also known as "rainwater harvesting") system can yield 1,000 litres (260 US gal) of water from 1 cm (0.4 in) of rain on a 100 m 2 (1,100 sq ft) roof. Rainwater tanks are installed to make use of rain water for later use, reduce mains water use for economic or environmental reasons, and aid self-sufficiency.
Rainwater or surface run-off from rooftops, courtyards, or artificially prepared catchments (locally called agor) flow into the tank through filtered inlets in the wall of the pit. [ 2 ] [ 3 ] The water stored saves people from the daily task of walking long distances to fetch water from sources which are often contaminated.
configuration of domestic rainwater harvesting system in Uganda. [1]Rainwater harvesting (RWH) is the collection and storage of rain, rather than allowing it to run off.. Rainwater is collected from a roof-like surface and redirected to a tank, cistern, deep pit (well, shaft, or borehole), aquifer, or a reservoir with percolation, so that it seeps down and restores the ground w
There were two types: the tank cistern and the filter cistern. Such a filter cistern was built at the Riegersburg in Austrian Styria, where a cistern was hewn out of the lava rock. Rain water passed through a sand filter and collected in the cistern. The filter cleaned the rain water and enriched it with minerals. [citation needed]
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. [8]
Firefighting version with internal 15,000 litres (4,000 US gal; 3,300 imp gal) fire retardant tank. [33] Mi-26MS Medical evacuation version of Mi-26T. Up to 60 stretcher cases in field ambulance role, or can be equipped for intensive care or as field hospital. [33] Mi-26P 63 seat passenger version. [33] Mi-26PK Flying crane derivative of Mi-26P ...