Day water density
Surface water density (TWD) is a term from the construction industry . It describes the impermeability of covers and building materials (e.g. concrete), which prevents day water from penetrating into a shaft or a structure, for example. The condition of the complete sealing is known in the construction industry as surface water proof (English: storm water-tight, water-tight rain or impermeable to rain water ).
With Tagwasser doing the right of the atmospheric is rainfall derived and are consistent on the surface, seepage or free-flowing surface water and groundwater outcropping called. The surface water density therefore only relates to these natural water influences, but not to the tightness against targeted spraying, against the influence of pressurized water or artificial suction.
In mining in particular , day water also refers to water penetrating pits, which either comes from rivers or is of atmospheric origin.
The requirements for the surface water density of attachments and covers for traffic areas including the securing of the cover and grate in the frame are regulated by the European standard EN 124 (formerly DIN 1229 in Germany).
literature
- Der Baumeister - trade journal for architecture, planning, environment; Michigan University Press 1980.
- Bernhard Arenz: network master . Oldenbourg-Verlag 2008, ISBN 3-8356-3153-5 .
Individual evidence
- ^ Otto Lueger : Tagwasser (encyclopedia entry). In: Lexicon of all technology and its auxiliary sciences. 2nd edition, Deutsche Verlagsanstalt, Stuttgart and Leipzig 1904–1920. 1920, accessed May 29, 2018 .
- ↑ Tagwasser (encyclopedia entry). In: Pierer's Universal Lexicon of the Past and Present. 4th edition, publishing house by HA Pierer , Altenburg 1857–1865. 1865, Retrieved May 29, 2018 .
- ↑ DIN 1229 in www.beuth.de , accessed March 22, 2009, 4:40 p.m.