Canterbury Regional Council is warning boaties to beware of submerged debris in Lake Aviemore

There are fears a violent downpour might dislodge logs from the surrounding hillside, which could end up in the water.

Deputy Harbourmaster Gary Manch says the debris can sit just a few inches below the surface.

Manch warns it could cause serious damage to any vessel it comes into contact with, so boaties should drive slowly.