Stormwater treatment

Basics Stormwater treatment

Reliability and protection of water bodies
Collected stormwater can be polluted with different materials, e. g. coarse dirt, mud and light liquids from road traffic or industrial facilities. These materials can cause malfunctions of stormwater management systems such as infiltration swales. In addition, they can pose a threat to downstream water bodies or the groundwater. M 153 bulletin.

Innovative alternatives
Conventional systems are often open concrete stormwater sedimentation tanks according to DWA-A 166. They require a lot of space and a considerable excavation depth. FRÄNKISCHE provides a comprehensive range of alternatives. SediPipe replaces e. g. stormwater sedimentation tanks and provides great advantages for construction and later land use thanks to its low excavation depth. The system does not consume any surface space. The land can be used for car parks or roads and tracks.

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In Europe and Germany, the proper handling of water is regulated by standards and guidelines. Below is a summary of the most important standards and guidelines:

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EU regulatory framework
With the EU Water Framework Directive, the EU member states have created common ground in comprehensive water protection. This also considers water collection areas that cross state lines. The general aim is to achieve and maintain a "good water status" for all surface water bodies and groundwater bodies by 2015. The member states independently have implemented their respectively defined objectives of the water framework directive in their regulations.

Implementation in Germany
The German Federal Water Act (Wasserhaushaltsgesetz, WHG) was adapted and brought into effect in March 2010 as amended. In the case of resettlement, the accumulating stormwater must be returned to the local natural water cycle. In addition, the best available technologies must be used for technical solutions in accordance with the cost-benefit ratio.

Based on the Federal Water Act, also individual state laws implemented the guidelines of the EU Water Framework Directive.

Planning guidelines in Germany

DWA A 138 worksheet
General directive for "Planning, Construction and Operation of Facilities for the Percolation of Precipitation Water" („Planung, Bau und Betrieb von Anlagen zur Versickerung von Niederschlagswasser") . The directive describes all kinds of occurring stormwater and all possibilities for a professional infiltration with respect to the respective pollution potentials. The goal is to achieve sustainable stormwater management by taking soil and water protection considerations into account.

DWA M 153 bulletin
Provides "Recommendations for handling stormwater" („Handlungsempfehlungen zum Umgang mit Regenwasser"). The bulletin recommends types of pre-treatment before stormwater infiltration or discharge into a water body.

DWA A 117 worksheet
For "Dimensioning Stormwater Holding Facilities" („Bemessung von Regenrückhalteräumen") .

DIN 1989 part 1-3
Regulation of requirements for rainwater harvesting systems. Country-specific regulations on the handling of stormwater must be complied with in general.

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RigoPlan software
The variety of and the number of possible applications of stormwater management systems cannot be completely covered, because every single system must be planned individually according to on-site requirements and site-specific problems. Dimensioning software can be used to plan different types of stormwater management systems, such as infiltration systems, detention basins.
This software is based on the relevant standards and guidelines of the DWA A 138 or the A 117 worksheets. The software also includes the dimensioning of stormwater treatment systems according to the DWA M 153 bulletin.

RigoCAD® drawing library
AutoCAD drawings include standard installation situations that are shown with longitudinal and lateral sections and as a layout, which can be modified by the planning engineer to fit the present building project. These drawings can then be included in the planning documents or added to the tender documents as explanatory detailed drawings.