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A utility tunnel, utility corridor, or utilidor is a passage built underground or above ground to carry utility lines such as electricity, steam, water supply pipes, and sewer pipes. Communications utilities like fiber optics, cable television, and telephone cables are also sometimes carried.
An underground power line provides electrical power with underground cables. Compared to overhead power lines, underground lines have lower risk of starting a wildfire and reduce the risk of the electrical supply being interrupted by outages during high winds, thunderstorms or heavy snow or ice storms. An added benefit of undergrounding is the ...
location type length (ft) opened notes ref Arch Cape Tunnel: US 101, 8 mi (13 km). south of Cannon Beach: automobile: 1,228.1: 1937: goes through Arch Cape: Cape Creek Tunnel: Lane County on US 101: automobile: 714: 1931? refs disagree over year and length 1,228.1' vs. 714' Cornelius Pass Tunnel: Portland: railway abandoned: 4,100(?) March 21, 1911
In 1870 an underground station for local horse-drawn streetcar service was added at 38th St along with stations at the portals at 34th St and 40th St. [5] After the completion of Grand Central Depot in 1871 the tunnel was used exclusively by local streetcars. The streetcar line was electrified with underground conduit power in 1898. [5]
They are especially beneficial to densely populated areas, particularly those locations where overhead cable posts are unavailable or are not ideal. [3] Locating underground cables—as well as other underground facilities—is an integral pre-excavation process mandated by laws and guided by a number of industry standards. [4]
The selected inside diameter of the MWWST tunnel conduit is 4.3 m (14 ft) from Shaft D to the Norumbega Reservoir and 3.7 m (12 ft) for the remainder to Shaft 5A and Shaft W. The shaft conduits vary from 3.7 m (12 ft) to 2.4 m (8 ft), depending on the location, metering, hydraulic and future access requirements.
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This may be done because of venting requirements, and also serves to indicate the location of underground facilities that are especially hazardous if disturbed. As of 2022 [update] , utility locators depend primarily on three types of utility locating equipment to do their job, including GPR , electromagnetic profiling locators, and radio ...