Translations:Versickerung und Retention/10/en

Surface / Area	Qualitative evaluation
Green roofs, fields and cultivated land; roof surfaces without the use of uncoated metals (copper, zinc and lead), terrace surfaces in residential and similar commercial areas	non-hazardous
Roofs with usual proportions of uncoated metals, cycle tracks and footpaths in residential areas, calm traffic areas; lawns and car parking without frequent vehicle changes; as well as lightly used vehicle areas (up to DTV 300 vehicles); streets with DTV 300 - 5,000 vehicles, e.g. access roads, residential and district streets; airport tarmac; roofs in commercial and industrial areas with significant air pollution, see DWA-A138.	tolerable
Lawns and streets in commercial and industrial areas with significant air pollution; for special zones see DWA	intolerable

Source DWA-A138, DTV = average daily traffic intensity