Mangatawhiri Dam Spillway

Division: Engineering
Location: Auckland
Started: May 2007

Cost: $2.5 million
Client: Watercare Services
Completed: November 2007

Built in the early 1960s, the spillway channel was at the point of yield due to a slip plane in the adjacent hillside and required reinforcing.

Brian Perry Civil relined the channel and excavated and refilled a 100m long by 8m deep hole at the base of the spillway, remnant of a major spill in 1966 that ran at 140m³ per second at its peak.

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