A combination of three types of service corridor will be used to realize this project.
(Maaiveld = ground level) 
 

Variant 1 involves pipes which are laid underground at a certain depth and which need not be directly accessible for maintenance or other purposes.

In variant 2, pipes are laid at a depth and ‘boxed in’, so that they are more easily accessible for maintenance, etc.

In variant 3, pipes are ‘boxed in’ and laid just below ground level, so that they are permanently accessible. In this variant, connections to the various companies have been anticipated, and expansion is simpler than with the other variants.