."It's raining, it's pouring, the earth is getting wet …" Children's song
			For the earth to get wet, the rain must reach it in the first place. What sounds so natural is in fact something that in developed areas with a high degree of soil sealing the rain often fails to do. But why exactly are we so keen on getting the rain into the earth, after all? Well, one thing after the other. Initial situation. In the municipality of Buchdorf, a new residential area is to be developed. Since we already proved our professional skills during the development of an industrial area in Buchdorf, we are awarded the contract. We are expected to come up with unconventional solutions that take into account the requirements of urban planning. The earth doesn't get wet. Due to the planned development of the site that is situated at a southern slope, some 70% of the soil is going to be sealed. In the same way, 70% of the rainwater would have to be deflected. This would lead to a considerable increase in the danger of flooding and the deflection would also impair the groundwater recharge. As a result, the area would slowly be turning into wasteland. Although this problem could be solved by an artificial supply of rainwater, we consider this too much trouble. The earth is getting wet after all. It makes much more sense to us to drain the rainwater on site. But for this purpose, the subsoil has to be suitable. Our soil report gets things straight - the soil joins in. We intend to insert green belts in the residential area that is to be developed. The water draining away from roads, roofs and yards runs over narrow, grass-covered green belts into a trough drain system. The ring-shaped ditches collect the excess water and lead it over a slight gradient into a drip sink. In this trough there is a stone drain, i.e. a kind of gravel box. Normally the green belts and the trough drain the rainwater. Only in case of extremely heavy rains the water runs on into an additional reservoir and is infiltrated there in the same way over a gravel bed. With this innovative solution we ward off the danger of flooding and preserve the groundwater level.
			The urban development plan. This problem being solved, we are able to continue the urban development plan. We set out land improvement measures as well as green and compensation areas. Then we plan the position, height, roof-covering and, of course, the utilization of the buildings. We partition the residential area within the green belt from the rest of the village in order not to harass residents with noise and dust. Meanwhile the planning has been approved. Now we are turning to the system of roads and footpaths. At the same time we start the detailed planning of the drainage system.
			A windfall … The municipality of Buchdorf considers the trough drain system a good idea. For the proposal makes sense not only in environmental terms. At the same time, by deciding against the embedding of a rainwater discharge conduit, the municipality saves € 300,000 in building costs. Interested? We have more in store.

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