3.2.Sections

 3.1 Typology
 

 3.7  Surfacing run-off plane

 3.7.1 Run-off plane 
with a single channel;


3.7.2 Run-off plane 
with double channel;


3.7.3 Run-off plane 
with hanging channel;


3.7.4 Mixed run-off planes;

 3.8 Use of the shafts

 3.8.1 Shafts for inspection;


3.8.2 Technical shafts;


3.8.3 Shafts for ventilation;


3.8.4 Secondary shafts


3.8.5 Multifunctional shafts

 3.3 Covers

 3.6. Basins 

3.6.1 Basins of sedimentation


3.6.2 Basins of deviation


3.6.3 Basins of collection

 3.5 Techniques 
of building 
of the main tunnel

3.5.1 Masonry building


3.5.2 Excavation a
nd material drawing up 
techniques


3.5.3 Methods and tools used


3.5.4 Marks of the e
xcavation work 
over the inner surfaces;

3.5.5 Possible dates

3.5.6 Following 
maintenance works
and restoration;

3.4 Pipes