relevant territorial waters, that is to say, subject to subsection (5) below, the waters which extend seaward for three miles from the baselines from which the breadth of the territorial sea adjacent to Scotland is measured;

coastal waters, that is to say, any waters which are within the area which extends landward from those baselines as far as the limit of the highest tide or, in the case of the waters of any relevant river or watercourse, as far as the fresh-water limit of the river or watercourse, together with the waters of any enclosed dock which adjoins waters within that area;

inland waters, that is to say, the waters of any relevant loch or pond or of so much of any relevant river or watercourse as is above the fresh-water limit;

shall deposit maps with F2SEPA showing what appear to him to be the fresh-water limits of every relevant river or watercourse . . . F3; and

may from time to time, if he considers it appropriate to do so by reason of any change of what appears to him to be the fresh-water limit of any river or watercourse, deposit a map showing a revised limit for that river or watercourse;

In this section—

that any area of the territorial sea adjacent to Scotland is to be treated as if it were an area of relevant territorial waters for the purposes of this Part;

that any loch or pond which does not discharge into a relevant river or watercourse or into a relevant loch or pond is to be treated for those purposes as a relevant loch or pond.

contain such supplemental, consequential and transitional provision as the Secretary of State considers appropriate; and

make different provision for different cases, including different provision in relation to different persons, circumstances or localities.

giving practical guidance to persons engaged in agriculture with respect to activities that may affect controlled waters; and

promoting what appear to him to be desirable practices by such persons for avoiding or minimising the pollution of any such waters,

any reference to the waters of any loch or pond or of any river or watercourse includes a reference to the bottom, channel or bed of any loch, pond, river or, as the case may be, watercourse which is for the time being dry; and

any reference to water contained in underground strata is a reference to water so contained otherwise than in a sewer, pipe, reservoir, tank or other underground works constructed in any such strata.