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At the communal level, planning takes the form of a general wastewater management plan (GEP).
As well as the sewer system - the key element of urban drainage - the GEP considers other elements, such as infiltration of rainwater. Account also needs to be taken of the fact that Switzerland's developed area increases by more than 2% per year, creating a growing need for the upgrading and renewal of drainage installations.
Not only wastewater disposal but also impacts on surface and groundwaters and the natural hydrological cycle are covered by the GEP.
The minimum requirements to be met by the GEP are specified in the Water Protection Ordinance (Art. 5; French/German/Italian).
In cases where a number of communes have formed an association, it may be appropriate to prepare a supplementary wastewater management plan (VEP) for jointly owned facilities (e.g. stormwater tanks, wet-weather overflows). The details of the plan are adapted to the particular characteristics of the facilities concerned.
Various publications (French/German/Italian) on the topic of the GEP/REP are available from the Swiss Water Pollution Control Association (VSA).
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