The pumping station, with the discharge of wastewater, has its particular significance in that, through the avoidance of too deep a position, it can improve the economic efficiency of a drainage system. It is extensively independent of topographical conditions and makes it possible to feed effluents into receiving waters and sewers even at high levels. Furthermore, using pumping stations, wastewater can be conveyed for widely spread catchment areas to treatment facilities sited at suitable locations. Wastewater pumps, which are mainly installed in the tank facilities (see ATV-A 166 [Not available in English]), are also frequently employed for the surface feeding and, in particular, for the emptying of stormwater tanks. The Standard applies analogously for these, however the technical requirements are to be matched to the tank-specific requirements (e. g. impeller shape, completely free passage, no continuous operation). Pumping stations are also suitable for control of flow in larger networks. It is emphasised, that this Standard is not to be employed where special drainage methods are used. These cases are dealt with in Standard ATV-A 116E.