The NRBW must keep the main river map for Wales.
For the purposes of this Act the main river map for Wales is a record of areas in Wales which—
The map is conclusive as to the extent to which a watercourse in Wales 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 NRBW must keep the map in electronic form.
In this section and sections 194A to 194E "watercourse" has the same meaning as in Part 4 of this Act.