2.—(1) Before beginning to construct any specified work, the undertaker shall submit to the drainage authority plans of the work and such further particulars available to it as the drainage authority may within 28 days of the submission of plans reasonably require.
(2) Any such specified work shall not be constructed except in accordance with such plans as may be approved in writing by the drainage authority, or determined under paragraph 11.
(3) Any approval of the drainage authority under this paragraph—
(a)shall not be unreasonably withheld,
(b)shall be deemed to have been given if it is neither given nor refused in writing within 56 days of the submission of plans for approval and in the case of a refusal, accompanied by a statement of the grounds of refusal, and
(c)may be given subject to such reasonable requirements as the drainage authority may make for the protection of any drainage work or fishery and for the prevention of flooding.