Kaihu Flood Control Scheme Investigation - Stage 3b

The Northland Regional Council (NRC) requested Barnett and MacMurray (B&M) investigate two questions raised by stakeholders in relation to the Kaihu River.

1. Briefly investigate the effects of realigning the Kaihu River mouth to reduce possible backwater effect due to ebb tide and flood flows in the Northern Wairoa River.
2. Briefly investigate the water surface gradient in the lower Kaihu River (downstream of Baylys Coast Rd) at low tide in 2 and 5 year ARI flood events, using existing model results.

This short report gives the results of the investigation.