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The following considerations should be accounted for in designing utility tunnels:

 Wet utilities should be separated from the dry utilities and installed in a separate compartment
 Tunnels should be designed as a walk‐through system providing walkway access, and allowing
for removal and replacement of valves, expansion joints etc.
 Tunnels may typically have a height of 1.9m or more. See Figures 15 and 17 which are from ITU‐
T [b‐27]. The example shown in [b‐1] is 4m high.
 Tunnels may typically have a width of 0.7 m or more. See Figures 15 and 17 which are from ITU‐
T [b‐28]. The example shown in [b‐1] is 4m wide.

Figure 4 – Example of utility tunnel
[Source: Abu Dhabi Utility Corridors Design Manual, b‐ 1]

 Tunnels should be accessible through on‐grade entrances with sloped hatches and sloping
walkways
 Tunnels should be properly ventilated; ventilation shafts should be constructed at a minimum
spacing of 50‐75 m or as deemed necessary based on actual tunnel dimensions.
NOTE – Different countries may have other national standards or regulations.

396 ITU‐T's Technical Reports and Specifications