3.—(1) Before commencing construction of any specified work, the undertaker must submit to the Agency plans of the specified work and such further particulars available to it as the Agency may within 28 days of the receipt of the plans reasonably require.
(2) Any such specified work must not be constructed except in accordance with such plans as may be approved in writing by the Agency, or determined under paragraph 13.
(3) Any approval of the Agency required under this paragraph—
(a)must not be unreasonably withheld or delayed;
(b)is deemed to have been given if it is neither given nor refused within 2 months of the submission of the plans for approval or receipt of further particulars if such particulars have been required by the Agency 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 Agency may make for the protection of any drainage work or fishery or for the protection of water resources, or for the prevention of flooding or pollution or in the discharge of its environmental duties.
(4) The Agency must use its reasonable endeavours to respond to the submission of any plans before the expiration of the period mentioned in sub-paragraph (3)(b).