definitionThe term rainwater harvesting refers to reuse of stored water, including water purification, and can form part of a sustainable drainage system. Although its main purpose is the increase of water supply in areas of water scarcity where the conventional water supply has failed to meet the demand of the community, rainwater harvesting has also been proven to be an important technique for flood mitigation. The “areal” approach of managing rainwater at source within a watershed, especially in urban areas, by collecting and then storing the water in numerous tanks and storage structures, can reduce peak runoff and help in reducing peak flow. Examples of equipment used as rainwater harvesting systems are rainwater tanks or barrels or cisterns which are used to collect and store rain water runoff, typically from rooftops via rain gutters (Jha A., et.al., 2011, p. 245).
Co-benefits and impactsThe water stored through rainwater harvesting can be used for non-drinking purposes resulting in water conservation e.g. flush the toilet, water the garden etc. It can also be used for drinking purposes if proper purification measures can be installed. Rainwater harvesting systems are installed to make use of rain water for later use, reduce main water use for economic or environmental reasons, and aid self-sufficiency.
(Wikipedia, Rainwater harvesting, accesses on Sept. 2016 & Wikipedia, Rainwater tank, accesses on Sept. 2016)
FRI indicators (Show all)Availability of hydraulic structures within urban system capable to reduce peak discharges
Sufficient storage capacity of the urban drainage system to accept flood water
Embodying flood risk in urban planning
Multidisciplinary knowledge exchange (engineer, architect/urban planner, sociologist, economist, politician - city government, etc.)
Protection against soil erosion
Illustrations (Show all)rm_images/rainwater.JPG
Last modified: Sept. 14, 2016, 10:44 a.m.