23.—(1) The Environment Agency must review each flood hazard map and each flood risk map prepared by it under regulation 18.
(2) Following a review, the Agency may prepare—
(a)a revised flood hazard map;
(b)a revised flood risk map.
(3) The first review must be completed before 22nd December 2019.
(4) Subsequent reviews must be carried out at intervals of no more than 6 years.
(5) The Agency must, so far as is reasonably practicable, co-ordinate a review under this regulation with a review of a river basin district under regulation 5(2) of the Water Environment Regulations.