** Gravity drainage systems outside buildings
(1) Property boundary
(2) Backwater level, unless otherwise specified by the competent authority
(3) Public land, public sewerage system
Overview
From the perspective of technical regulations, a distinction is made between public and non-public areas inside and outside buildings.
- DIN 1986-100 stipulates that drainage points above the backwater level must be drained by gravity. Only in cases where the gradient to the sewer is insufficient may the water be discharged via sewage lifting stations.
- DIN EN 12056-4 stipulates that drainage points below the backwater level must be protected against backwater by automatically operated sewage lifting units with a backwater loop. Under certain conditions, backwater valves may also be used in accordance with DIN EN 13564-1. In particular, for lifting stations, a dual-pump system must be installed in accordance with DIN EN 12050-1 or DIN EN 12050-2, depending on the application, if the flow of wastewater must not be interrupted. The second pump doubles the operational reliability.
Standards | Description | Edition |
| DIN 12056-4 | Gravity drainage systems within buildings — Part 4: Wastewater lifting systems — Design and dimensioning | 2001-01 |
| DIN EN 752 | Gravity drainage systems outside buildings | 2008-04 |
| DIN EN 13564-1 | Backwater valves for buildings – Part 1: Requirements | 2002-10 |
| DIN 1986-100 | Drainage systems for buildings and sites – Part 100: Provisions in conjunction with DIN EN 752 and DIN EN 12056 | 2016-12 |
| DIN EN 12050-1 | Wastewater lifting systems for building and site drainage – Part 1: Sewage lifting systems | 2015-05 |
| DIN EN 12050-2 | Wastewater lifting systems for building and site drainage – Part 2: Wastewater lifting systems for wastewater without sewage | 2015-05 |
| DIN EN 12050-3 | Wastewater lifting stations for building and site drainage – Part 3: Lifting stations for limited use | 2015-05 |
| ÖNORM B 2501 | Drainage systems for buildings and sites – Design, execution and testing, Supplementary guidelines to ÖNORM EN 12056 and ÖNORM EN 752 | 2016-08 |
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