Depending on country, statutory regulations and customer requirements, SIWOPLAN storage basins are sealed with materials of differing qualities and thicknesses.
The following systems are available:

System A: Factory-prefabricated sealing sheets. Already at the factory, SIWOPLAN is able to prefabricate certain sealing sheets up to a size of several thousand square metres according to the dimensions and shape of the earthen dam basin, e.g. 1.0 mm; 50 x 50 metres.

System B: Sealing sheets laid and welded on site. Stronger sealing sheets with a material thickness of, for example, 1.5 mm or 2.0 mm are usually laid directly on site in the dam basin, welded by machine and tested for tightness and quality of the seal.