Rainwater Harvesting - Case Studies From Around the World

8/12/2019 Rainwater Harvesting - Case Studies From Around the World

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Case Studies from Around the

WorldTanuja Ariyananda

LRWHF


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Star City

Location: Seoul, Korea

Extend: Built on a 6.25 hectaresite, originally owned by

Konkuk University 4 apartment towers with 1,310

apartments, completed in 2007

Municipality refused on theground that it will increase

storm water flow: Overall, theprecipitation has increased, withmore rainfall in summer and lessin spring.


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Design 3% subsidy to build 40

apartments to be built where the plans already

allowed for three undergroundstory's for car parking. A fourth

sub-surface storys would nowbe added to accommodaterainwater in two meter deeptanks

Each block has a plan areaof1500m2

Rainwater from all four roofs ispiped to the RWH basementunder the 35 storeysblockwhere there are 3 separatestorage tanks each of1000m3capacity.


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Multi Purpose Rainwater Management

Floodontrol

WaterSaving Emergency

1000 M3 1000 M3 1000 M3

For Others !!! For Myself !!! For All of us !!!


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Operation


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Benefits Monthly monitoring programme shows that some 40,000m3 of rainwater has beenharvested and beneficially used over the 12 month period. Estimated about 67% of the rainfall on the site With average consumption from the public supply amounting to 250 litres/head/day

in Seoul, it is no surprise to learn that Star City residents welcome the reduced waterrate resulting from the harvesting scheme.

Reduction in flood risk in a floodprone area.

Considering the average cost of Supplying one cubic meter of tap water in Korea is about seven U.S. dollars, the

saving is significant to the city, while the residents will save about US$ 80,000 peryear in reduced payment for water.

The construction cost for the rainwater harvest system was approximately US$450,000

Energy saving Energy required to treat and deliver a cubic metre of tap water is 1.8244kWh Treatment of grey water (treated on site) 1.1177kWh per cubic metre Rainwater needing no transport or treatment, can be delivered for a mere 0.0012kWh, the

pumping energy needed to raise the water from storage.


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Capture The Rain

the skyscraper features an innovativeroof and external shell, which consistsof a system of gutters to harvestrainwater to meet the daily needs of itsinhabitants.

The designers estimate that theaverage daily consumption of waterper person is about 150 liters, out ofwhich 85 liters may be replaced byrainwater

A network of gutters on the externalsurface of the building is designed to

capture rainfall flowing down thebuilding. While most of the harvestedwater is supplied to the apartments,surplus water is stored in a reservoirunder the building.


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Rain House

Rainwater Harvesting - Case Studies From Around the World

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