Kaiapoi River Marine Precinct & Navigation Channel Dredging Information

The Kaiapoi River is set to get an upgrade for boaties.

Navigability has been limited in some parts due to silt build up. This is particularly problematic for the Coastguard when they need to respond to call outs at low tide.

In all, six locales of the Kaiapoi River are to be dredged between the Waimakariri confluence and the Williams Street Bridge.

Smith Crane and Construction will be using a state-of-the-art Bell 250 cutter-suction dredge operated from a sectional barge. The floating barge will allow for better access to the various dredge sites on the river.

The excavator mounted dredge spins the riverbed material, while simultaneously sucking water.

This generates significantly less sediment than conventional clamshell or bucket dredging methods.

The cutter-suction head will be connected to a pipe, which will float to the banks before carrying discharge material to settling ponds at Corcoran Reserve and McIntosh Basin sites. The settling ponds allow time for the sediment to separate from the water.

Water will then be filtered and pumped back into the Kaiapoi River.

To allow for equipment movements, the Coastguard and Askeaton boat ramps will both close for short windows during the work period. Kairaki Ramp will be the alternative launching ramp during these periods. Closure dates will be advertised closer to the time. Walkways will remain open.

Once the dredging has been completed at the marina basin area near the Kaiapoi Bridge, a new pontoon is to be installed alongside the Riverview Terraces.

Dredging works begin 8 July 2019 and will continue until August. Please warn your children of the dangers posed by this machinery. Ensure they stay away from this work site and follow all directions from workers.

For more Information:
Duncan Roxborough
Implementation Project Manager - District Regeneration
0800 965 468 (0800 WMK GOV)