Paragraph 19
Before beginning to construct any specified work, the undertaker must submit to the drainage authority plans of the specified work and such further particulars available to it as the drainage authority may within 28 days of submission of the plans reasonably require.
The undertaker must not commence construction of the specified work until approval, unconditionally or conditionally, has been given as provided in this paragraph.
A specified work must not be constructed except in accordance with such plans as may be approved in writing by the drainage authority or determined under paragraph 26.
Any approval of the drainage authority required under this paragraph—
must not be unreasonably withheld or delayed;
is deemed to have been given if it is neither given nor refused within 56 days of the submission of the plans for approval, or submission of further particulars (where required by the drainage authority under sub-paragraph (1)) whichever is the later; and
may be given subject to such reasonable requirements as the drainage authority may make for the protection of any drainage work, for the protection of any ordinary watercourse or for the prevention of flooding.
The drainage authority must use all reasonable endeavours to respond to the submission of any plans before the expiration of the period mentioned in sub-paragraph (4)(b).
Any refusal under this paragraph must be accompanied by a statement of the reasons for refusal.