Environment Canterbury is monitoring river flows, lagoon levels and drainage infrastructure as heavy rain and snow affect parts of the region.

MetService issued a Red Heavy Rain Warning for the Kaikōura District and the Hurunui District north of Hanmer Springs, while the most significant weather overnight was recorded around Waimate.

Environment Canterbury Chair Deon Swiggs said “events like this are a reminder of the important work that happens behind the scenes to reduce flood risk across Waitaha Canterbury.

“Our flood protection and drainage network plays a critical role during severe weather, and I’d like to thank our staff and partner agencies who are monitoring conditions and responding where needed.

“For those affected by the weather, please take care, stay up to date with the latest information. Be careful on roads and always avoid driving through floodwater.”

Despite significant rainfall overnight in the Waimate district, the Waihao, Saltwater Creek and Opihi river mouths opened naturally without the need for mechanical intervention.

Southern duty flood controller Blair Poulter said teams worked through the night to monitor conditions and respond where needed.

“After a period of heavy rain, the challenge is often what comes next. The ground is already saturated in many areas, so even relatively light rainfall can lead to rapid rises in waterways and localised surface flooding.

“Our teams are monitoring conditions closely, checking key assets and working with partner agencies to understand what’s happening across the catchments.”

Environment Canterbury said the Waihao Box was carrying water to the sea, while staff continued to monitor conditions across the affected catchments.