21.—(1) Subject to any agreement concluded between the Harbour Authority, the Conservancy Authority and any other party benefiting from material dredged by the Conservancy Authority, the Harbour Authority must pay the Conservancy Authority for material dredged by the Conservancy Authority under this Order from so much of the river as is vested in the Conservancy Authority, consideration calculated at a rate agreed between them and otherwise in accordance with this paragraph.
(2) The Harbour Authority must pay reasonable consideration under sub-paragraph (1) as respects material dredged in the course of the construction of the works authorised by Schedule 8 (deemed marine licence) based on the quantity of such material that—
(a)is not used for the construction of—
(i)the authorised works;
(ii)any other works related to the construction of Able Marine Energy Park; or
(iii)the related development; and
(b)is not owned by the undertaker; and
(c)is sold by the Harbour Authority or by any other person exercising any powers under this Order.