Sylvenstein Reservoir: Waterproofing of the Seepage Water Tunnel

In the course of the refurbishment measures started in 2011 after more than 50 years of operation, the dam and the bed of the Sylvenstein Reservoir in Bavaria were provided with a new cut-off wall (two-phase diaphragm wall) and a precise seepage water measurement system. The seepage water measurement system consists of drainage piles and a seepage water tunnel.

As the oldest reservoir in Bavaria, and the most important for flood protection, the Sylvenstein Reservoir (Fig. 1) has been fulfilling its purpose for more than half a century and has demonstrated its protection function at times of high flood flows, particularly for the town of Bad Tölz and the state capital of Munich. As expected, the dam has settled during this long period of operation, and the exceptional burdens of the flood events in the years 1999, 2005 and 2013 have also left traces.

As a precautionary measure against the consequences of possible climate change and taking into account...

Related articles:

Issue 2009-05 Construction Equipment

Mixing and Grouting Systems for the Weinberg Tunnel in Zurich/CH

Mixing and grouting systems made by Häny are being used to construct the new Alstetten – Zurich Main Station - Oerlikon cross-city underground link in Switzerland. In contract section 3 (Weinberg...

Issue 2019-03 Sika Deutschland

Full-Area Grouting behind existing Shotcrete Layer

After more than 60 years of use, refurbishment of the road tunnel between Neuhaus and Spitzingsee bei Schliersee, Germany, was urgently necessary. The waterproofing directly behind the shotcrete inner...

Issue 2017-06 Tunnels to Feuerbach and Bad Canstatt for the Stuttgart 21 Project

Injections to restrict ingressing Water in Rock containing Anhydrite

The water-bearing leaching front is sealed by means of drilling in advance of the excavation by grouting polyurethane so that no groundwater can come into contact with the anhydrite-bearing rock. For...

Issue 2018-03

New Joint Sealing Process for Segment Tunnels

Targeted Sealing of Leaks in Segment Linings In targeted sealing of leaks, the direct route through the joints between segment linings is used in order to drill through the gasket and inject grout on...

Issue 2015-02


Rascor has been internationally active for 50 years as a manufacturer of products for the waterproofing of tunnels and specialised civil engineering works. The particular speciality is grouting...