Connection of the Second Manapouri Tailrace Tunnel
Abstract
The provision of a temporary bulkhead within the existing tailrace at a point close to the underground Manapouri power station in New Zealand was the method used to create a dewatered area in which to accomplish the junction between the existing and the new tailrace tunnels. The bulkhead solution provided several major advantages over the original proposal to build a cofferdam in the outlet channel, and significantly reduced the dewatering necessary to undertake the tasks.
2003
Hydropower and Dams
R.J. Caulfield
Jacobs Associates
