4(1)If the following conditions are satisfied, a designating authority may designate for the purposes of this Schedule—
(a)a structure, or
(b)a natural or man-made feature of the environment.
(2)Condition 1 is that the designating authority thinks the existence or location of the structure or feature affects—
(a)a flood risk, or
(b)a coastal erosion risk.
(3)Condition 2 is that the designating authority has flood or coastal erosion risk management functions in respect of the risk which is affected.
(4)Condition 3 is that the structure or feature is not designated by another authority for the purposes of this Schedule.
(5)Condition 4 is that the owner of the structure or feature is not a designating authority.