Dewatering, waterproofing and drainage - Tunnel Engineering: Basics and Additional Services for Design and Construction - page 226

Figure 5-20 Waterproofing detail
with single-layer plastic membrane
at the sides and in the crown
(top) and in the invert (bottom)
[EAG-EDT].
Figure 5-21 Point fixing of
protection layer and plastic water-
proofing membrane to the support
[193].