Rehabilitation of Urft Dam - Rock Mechanics Based on an Anisotropic Jointed Rock Model - page 791

Figure 24.23 Temperature distributions in the dam, monitoring results (Polczyk 2001)
Figure 24.24 Temperatures at dam crest (Polczyk 2001)
24.6.3 Pore Pressures and Quantities of Seepage Water
Figure 24.25 (left) shows the equipotentials in the middle of the valley that were derived
by inter- and extrapolation of pore pressure measurements. A considerable reduction of
the hydraulic heads takes place in the rock mass and in the lower part of the dam from up-
stream to downstream up to the level of the lower inspection gallery. Thus, the equipoten-
tials on the downstream side of the lower inspection gallery are scarcely influenced by the
water level at the upstream side. This is a clear sign of the efficiency of the drainage system.