A coroner's inquiry will look into 18 deaths linked to Cyclone Gabrielle and Auckland's Anniversary Floods

Open Justice reports that includes three suspected self-inflicted deaths in months following the extreme weather events early last year.

Coroner Erin Woolley is hearing submissions on the scope and boundaries of an inquiry into the deaths.

Preliminary issues raised include flood warnings, weather preparedness and emergency services -- after 111 callers were told no help was coming.

The inquests are likely to be heard late next year.