Malter Dam
Location:
Dippoldiswalde
Build time:
7/2019 - 6/2023
Client:
State dam administration of the Free State of Saxony
Malter Dam
With the expansion of the spillway at the Malter dam, an important infrastructure project for flood protection in Saxony has been realized.
Malter dam - extension of the spillway to restore flood safety
The complex construction work served to restore flood safety and placed the highest demands on planning, precision and technical execution. The result: a modern, efficient facility that ensures the long-term protection of people, nature and infrastructure.
The Malter dam near Dippoldiswalde plays a central role in flood regulation and drinking water supply in the region. In order to ensure its functionality even during extreme weather events, the spillway was extensively expanded between 2019 and 2023. The measure was implemented on behalf of the State Reservoir Administration of the Free State of Saxony by Ed. Züblin AG, Directorate East, Saxony Division, in a joint venture with Karl Köhler Bauunternehmung GmbH & Co.
Complex construction task under challenging conditions
The expansion of HWE encompassed a wide range of services - from demolition and earthworks to concrete, reinforced concrete and steel construction work to pipeline construction. A total of around 150,000 tons of earth, mainly rock, was excavated, processed and used for reinstallation.
A central element was the deepening of the approximately 12 meter wide collecting channel by up to 3 meters in order to significantly increase the hydraulic capacity. The weir spillway was anchored with around 20 permanent piles up to 10 metres long and thus permanently stabilized. The system was supplemented by a division structure made of reinforced concrete, which distributes the discharge evenly and optimally connects the new construction to the existing system.
New shot channel and stilling basin for controlled discharge volumes
The newly constructed weir channel with a gradient of 19.2 percent and up to 8.5-metre-high edge walls guides the water masses safely into the stilling basin, which serves as an energy conversion basin. The bottom of the weir was designed as a seamless, 80-centimetre-thick reinforced concrete slab - a durable construction that can withstand the high loads.
The stilling basin itself measures 18 meters in width and 25 meters in length. Its concrete edge walls, which are up to 10 meters high, are spanned by a new stilling basin bridge made of reinforced concrete with a span of 12 meters and a width of 15 meters. A total of around 5,000 square meters of water-draining formliners (Zemdrain) were used to further improve the concrete surface quality and durability.
A secure foundation for future generations
To stabilize the subsoil and the adjacent riverbed, a post-bed stabilization was carried out with concreted edge walls and 3,000 square metres of concrete armourstones. A final terrain regulation ensures that all inflows and outflows are optimally guided.
With its successful completion in June 2023, the flood safety of the Malter dam has been sustainably restored. The project impressively demonstrates how modern engineering and the responsible use of natural resources go hand in hand - for a safe future in the face of climate change.
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