Option H (Reach 2 & 3)

Managed spillway: Engineered spillway on north side of the river upstream of the SH1 bridge 

If flood capacity is increased, a spillway could be used to allow water to overflow from the river in a controlled manner to the north and into either Saltwater Creek or across the highway and into the estuary.

Option H: Managed spillway. Engineered spillway on north side of the river, upstream of the SH1 bridge

• Note that the shaded area is indicative only and does not represent exact flows.

Pros

• Reduces flood pressure on the SH1 bridge.
• Improves flood protection for Waikuku.
• Allows overflows to occur in a controlled and predictable way.
• Guidebanks can help direct flood flows along a defined path.

Cons

• Will result in flooding of properties within the floodway when activated (likely in excess of 3,000 cumecs, almost twice the recorded peak flow in May 2021).
• Some properties in this area are at risk of flooding under existing conditions.

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