Discharge figure
In wastewater technology, the drainage index ( symbol :) is a measure of whether sanitary objects in a house are used irregularly, regularly or frequently. It also takes into account - depending on the type of building - the simultaneous use of drainage objects. It is required to calculate the partial wastewater runoff Q ww in buildings and thus also as a partial value for dimensioning underground pipes, collecting pipes, collecting connection pipes and downpipes. The discharge index is dimensionless, it is secured for residential buildings by a measurement database.
The drainage index is read from tables according to DIN EN 12056-2, taking into account the degree of use of the drainage object. For residential buildings, offices, pensions, the outflow coefficient is K = 0.5; for hospitals, schools and restaurants K = 0.7 and for public buildings and facilities K = 1.0. Where long-lasting runoff is more likely (e.g. industrial plants) or where runoff peaks can occur briefly one after the other, larger runoff indicators are recommended.
Individual evidence
- ↑ Dimensioning-of-wastewater pipes according to DIN EN 12056-2 & DIN 1986-100 (PDF; 211 kB).
- ↑ DIN 1986-100, Table 14-5.
- ^ Heinrichs, Rickmann, Sondergeld, Störrlein: Building and Property Drainage , 3rd Edition, 2005 (basic work), p. 228, Beuth Verlag, ISBN 978-3-410-15970-4 .