Civil Defence director Sarah Stuart-Black said while the worst of the weather had passed for most regions, there was still a danger from rivers in places such as Edgecumbe as the water made its way through catchments.
"It is possible that delayed flooding will occur as higher-than-usual water volumes flow through the catchments and through the river systems. Caution around waterways through the next few days is recommended," Stuart-Black said.
Aerial assessments were under way this morning to check the extent of damage across the Bay of Plenty.
Stuart-Black urged people to try to delay any non-essential travel for today because of the need to do repairs on roads and to be careful of flooding and slips over Easter.
Fire and police were dealing with calls to flooding, downed trees and power lines and several local roads were closed as was State Highway 1 in Seddon.
There were also widespread power outages in Whakatane, Edgecumbe and Ohope, as well as rural Gisborne and Hawkes Bay. Water and wastewater systems were also damaged in some areas.
• Those travelling should allow extra time, keep up to date with road and weather information and be prepared for "challenging" driving conditions such as debris and possible detours. "Please, don't take any chances."
• People evacuated should not return to their homes until cleared by local officials.