At the Ranshofen headquarters, the water supply for pumping groundwater is ensured by two service water wells and one drinking water well.
Volumes conveyed are calculated from measurements taken directly at the tapping point. Most of the operational service water is utilised for cooling in the casting, rolling and heat treatment processes. Service water withdrawal is consensus-based.
The cooling and quenching water is discharged into the existing cooling and rainwater sewer and from there – also within the framework of an existing discharge consensus – into the River Inn. Rainwater is largely drained away on AMAG’s premises or directly fed into the River Inn via the rainwater canal, while domestic wastewater is fed into the Braunau sewage treatment plant.
Groundwater withdrawal is accompanied by extensive monitoring, including groundwater level measurements.
Total service water withdrawal in 2019 amounted to 3,656,000 m3 (2018: 3,564,000 m3). For the purpose of multi-year comparison, the total service water withdrawn in 2007 was added to the bar chart. Specific service water withdrawn in 2019 amounted to 5.7 m3/t (2018: 5.6 m3/t). Drinking water withdrawal amounted to 99,400 m3.
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.