diversion tunnel

diversion tunnel

[də′vər·zhən ‚tən·əl]
(civil engineering)
An underground passageway used to divert flowing water around a construction site.
References in periodicals archive ?
B--On the western slopes of the Hankkov valley and range of diversion tunnel inlet limestone units L11:
Unconfirmed information indicates that three trucks remain under the rubble, while a few people are trapped in the diversion tunnel - the site of construction works.
Rather than incurring significant costs to divert the flood waters, KCB recommended an innovative flood handling plan using a small diversion tunnel and roller- compacted concrete construction (RCC).
They moved on to the Hills Creek Diversion tunnel in Oregon and then to the Clear Creek Tunnel, a nine mile tunnel in Northern California that brought water from the Trinity River through mountains to the Whiskeytown Power Plant and reservoir.
The sources said access roads to Weir and Power House have been substantially completed along with concrete lining of diversion tunnel.
As per the terms of the contract, HCC will carry out the construction of concrete gravity dam, spillway and appurtenant works, coffer dam and diversion tunnel, HRT intake, head race tunnel including adits, surge shaft, civil works of pressure shaft, powerhouse and tailrace tunnel.
CUTLINE: (1) At the Leesville Pond, weeds are already sprouting around the Worcester Diversion Tunnel, left, which channels flood water under Pakachoag Hill, away from Webster Square.
The woman was found in a water diversion tunnel at the Jinhe Hydropower Plant in Hongbai town in Sichuan province.
The self-regulating flood protection provided by the Llyn Peris system (ie as Llyn Padarn rises in wet weather, the capacity of the diversion tunnel around Llyn Peris reduces and excess flow spills over the weir into Llyn Peris) has operated successfully throughout the life of the station and will remain in place.
The owner, Kennecott Copper, constructured a large concrete arch dam upstream of the pit to function primarily as a flood control structure, along with an 18,181-foot long drill and blast diversion tunnel to route the creek past the mining operations.
But as the lake level drops - 3 feet a day - the water is scouring silt from the lake bottom and carrying it through a diversion tunnel that the corps blasted out beside the dam.
Farther upriver, Glen Canyon Dam's diversion tunnel linings were severely damaged, but Hoover Dam's half-century-old construction barely flinched.