56.—(1) The following provisions shall apply for the protection of the Agency unless otherwise agreed in writing between Network Rail and the Agency.
(2) In this Part of this Schedule—
“the Agency” means the Environment Agency;
“construction” includes execution, placing, altering, replacing, relaying and removal and “construct” and “constructed” shall be construed accordingly;
“drainage work” means any watercourse and includes any land which provides or is expected to provide flood storage capacity for a flood event with an annual probability of occurrence of 0.01 or greater for any watercourse and any bank, wall, embankment or other structure, or any appliance, constructed or used for land drainage, flood defence or tidal monitoring;
“the fishery” means any waters containing fish and fish in, or migrating to or from the river Thames and the spawn, habitat or food of such fish;
“plans” includes sections, drawings, specifications and method statements;
“specified work” means so much of any work or operation authorised by this Order as is in, on, under, over or within 16 metres of a drainage work or is otherwise likely to—
affect any drainage work or the volumetric rate of flow of water in or flowing to or from any drainage work;
affect the flow, purity or quality of water in any watercourse or other surface waters or ground water;
cause obstruction to the free passage of fish or damage to any fishery; or
affect the conservation, distribution or use of water resources; and
“watercourse” includes all rivers, streams, ditches, drains, cuts, culverts, dykes, sluices, sewers and passages through which water flows except a public sewer.