The Agency must keep the main river map for England.
For the purposes of this Act the main river map for England is a record of areas in England which—
shows the extent to which any watercourse or part of a watercourse is to be treated as a main river or as part of a main river for the purposes of this Act, and
indicates which (if any) of those watercourses are watercourses designated in a scheme made under section 137.
The map is conclusive as to the extent to which a watercourse in England is to be treated as a main river or as part of a main river for the purposes of this Act.
The map must specify the date on which it takes effect.
The Agency must keep the map in electronic form.
In this section and sections 193A to 193E "watercourse" has the same meaning as in Part 4 of this Act.