Rainwater Harvesting System (RHS)



Rainwater harvesting system, also called the rainwater collection system or rainwater catchment system, a technology that collects and stores rainwater for human use. Rainwater harvesting systems range from simple rain barrels to more elaborate structures with pumps, tanks, and purification systems. The nonpotable water can be used to irrigate landscaping, flush toilets, wash cars, or launder clothes, and it can even be purified for human consumption. With water scarcity a pressing problem for many densely populated regions, rainwater harvesting systems can supply households and businesses with water for use in dry seasons and lessen the demand on municipal systems.


Given that rainfall is sporadic and that only a small proportion of global precipitation is easily available for human use, rainwater harvesting can be an efficient means of capturing that precious resource. In cities, much of the rain that falls on buildings, roofs, roads, and other hard landscaping does not percolate into the soil and is instead directed into storm sewers for disposal. Impermeable surfaces cause urban flooding in many areas and generate contaminated unusable water that is directed away from potable water resources. During dry months, local groundwater can be depleted, and many localities struggle to consistently provide enough potable water to meet demand. Rainwater harvesting for nonpotable functions, such as gardening and washing clothes, significantly reduces both the demanded amount of the total freshwater and the strain on stormwater infrastructure. That saving in the demand and supply of potable freshwater is significant in large cities. Although many localities encourage and even subsidize rain barrels and other rainwater harvesting systems, some areas, particularly those in the southwestern United States, view rainwater harvesting as a water rights issue and place restrictions on such collections.


Greywater reuse and rainwater harvesting systems shall be designed in a way that ensures the effluent is fit for purpose and presents no undue risk to health. The water quality of the treated effluent shall meet the standards stipulated in Table A.


Table B, summarises the sources of greywater and rainwater, as well as their potential uses.

TABLE A - Water Quality Standards for Treated Grey Water and Rainwater Effluent.


TABLE B - Grey Water and Rainwater Sources and End Uses.

Table 2..jpg
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