Page 26 RAIN Summer 1994 Volume XIV, Number 4 building programs and the Berlin IBA. The project was planned in 1983-84 and carried out between 1985 and 1988, while corresponding scientific research ran from 1988 until 1992. :rhe inte-. grated water concept was conceived and developed by the AG Oko (Arbeitsgemeins.chaft Okologisch.er Stadtumbau/Working Group for Ecological Urban Restructuring), who also coordinated research up until 1990. The i!ltegrated water concept at this apartment complex includes the following technical and social measures: Water Sparing·Fixtures and Technologies: Drinking water is spared through use of efficient toilet ~ystetris that use only 4-:6 liters in flushing, and incorporate the possibility of interrupting the water fl,ow. Water faucets have built-in outflow-i:eduction valves, a~d there are meters in each apartment for measuring cold, warm and recy~led water' use. Heat Exchange Technology: Heat is regained from waste water with a heat-p'ump for the preheating of warm water. Waste Water Treatment: ·Waste water is separated into grey and fecal water streams. Greywater is treated (also sewage water in a futu~e stage of the experiment) in a pond system of water plants (mainly reed and rush plants). . Rain Water Handling: All of the rain water is retained on site and kept completely separate from the waste water system, which is contained in a series of formally organized ponds. Greened roofs (about 1000m2 ) retain about 70% of the rain water falling on them, act ~s filters for the overflow, and positively influence the local climate. A naturally designed rain water pond is fed by the roofs via a separate filtering pond. The rain water pond's edges are planted with a rich variety of water plants, and it functions as a swimming and play area for the children. 1 Recharging of Ground Water: Part of the·treated greywater and rain water is fed back into the ground. Drinking Water Substitution: Drinking water is replaced by treated greywater for the flushing of toilets and watering of plants. A parallel piping system is used for drinking and service water. Open Space Design and Recreation: The ponds are integrated into a landscape based on socio-ecological principles, wherein a diversity of views and a range of natural elements and materials are made accessible. As a result, the residents can see and directly experience the local water circulation systems. Even the landscaping materials have been recycled: they reused old foundation material in the building of new support walls for the residents' gardens. User Concept: Residents were selected for the new
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