The water supply at the Ranshofen site is ensured by two service water wells and one drinking water well. AMAG is located on a groundwater body - a stream of water that drains into the Inn River at a rate of approximately 20-40 l/sec and 100 m flow below the plant premises.
The permitted use of industrial water is based on a withdrawal quantity determined by the authority for AMAG. Groundwater withdrawal is accompanied by extensive monitoring, including groundwater level measurements. The groundwater can be utilised directly in AMAG without chemical treatment and without transportation over long distances.
A large proportion of the water extracted is utilised for cooling as part of casting, rolling and heat treatment processes and is thereby only thermally loaded - specifically, this means that a large part of the water that is utilised is only heated, and neither consumed nor contaminated. A very small proportion of the water used is chemically contaminated. This operational effluent is treated in effluent treatment plants and the discharge is continuously monitored by measuring essential parameters via probes. If the measured value is exceeded due to impurities, the water is automatically directed into a separate basin, from where it is disposed of. In addition to ongoing measurement via probes, effluent samples are examined for a large number of parameters as part of certified monitoring by internal and external laboratories. Rainwater is largely drained at the AMAG site.
The total water withdrawal for AMAG in 2020 stood at approximately 3,277,000 m3 (2019: 3,656,000 m3). For the purpose of multi-year comparison, the total water withdrawn in 2007 was added to the bar chart below.
For many years, measures have been implemented as part of sustainable rainwater management.
To this end, numerous seepage reservoirs and seepage troughs for rainwater have been created on the plant site.
The total area of the realised or planned drainage possibilities extends to around 4 hectares. Around 128 hectares of roof and other areas are drained via these seepage areas.
The construction of rainwater seepage reservoirs reduces the volume of rainwater that was previously discharged into the River Inn via a collection channel. As a consequence, a large volume of rainwater from various roof and open spaces on the factory premises is cleaned in a controlled manner and drains away on site. The rainwater drainage is very similar to the natural water cycle: by passing through the seepage reservoirs and troughs, the water is cleaned by a specially installed soil filter. The rainwater treated in this way is fed directly into the body of water on the plant site.