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Surface Water Drainage Solution

Surface Water Drainage Solution The Problem and the Future Development The local drainage, retention, cleaning and rainwater utilisation are fundamental to modern rainwater management ensuring a long-term resource, protecting and providing cost effective provision of clean and process water for the population. Rainwater: Large volumes of rainwater, especially with residential- and trafficked areas, are drawn from the natural water cycle and directly discharged to the natural drainage system. This discharge is very expensive. Heavy rain quickly causes flooding and surcharging of sewage treatment plants. Land use: The share of residential- and traffic areas is about 12.9 % of the total area (approx.46,000 km2) in Germany. Experience has shown that half of this area is impermeable. This area must be drained, a fact that has inevitable consequences for the water balance in general and the natural ground water recharge in particular. In spite of renaturation, the constructed environment rises by an average of 115 hectares daily. Local drainage: This kind of drainage supports the natural water cycle and thus discharges into the natural drainage system. It makes an essential contribution to flood protection in river basins, especially. The drainage on property is controlled by building regulations and site specific requirements. The soil characteristics have an important bearing on the calculation of drainage capacity, which will need to be approved by the appropriate authorities. MORE INFOS at www.wrs-usa.com