The microtunnel boring machine (MTBM) used on a New York City (NYC) water project has been retrieved from its hole.
The MTBM had completed 646 m of tunnels in New York’s Schoharie Reservoir, which will be used to release water downstream to increase protections against flooding, as well as reduce fluctuations in the Schoharie Creek.
Southland Holdings was contracted by the NYC Department of Environmental Protection for the works, with the agreement worth US$142.6 million.
The reservoir is the northern most of NYC’s Catskill Mountains reservoir and the Schoharie Valley has suffered severe flooding in the past and, with concern over the reliability of the dam, the city decided to repair the dam and replace the existing output facility, with tunnels constructed at 57 m beneath the surface.
The tunnels were divided into the Land Leg and Water Leg, consisting of 362 m and 284 m of pipe respectively.
Works on the new tunnel system started in 2017 and boring work was completed in January this year, but the MTBM could not be removed due to the excessive ice from the winter season.
With boring finished, lining of the tunnels and installation of an intake structure will now take place.
Crews are also working on a valve structure on the creek to control the flow of water.
The project is due for final completion in 2022.
For more information visit the Southland website.
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