Chapter:	358F	Title:	TOLO HARBOUR AND CHANNEL WATER CONTROL ZONE STATEMENT OF WATER QUALITY OBJECTIVES FOR WATERCOURSES	Gazette Number:
Schedule:	2	Heading:	DEFINITION OF SUBZONES	Version Date:	30/06/1997

1. A water course is defined as a system that carries natural drainage storm water, excluding foul sewage systems. Wholly enclosed nullahs will not be included except when the condition of the water in the nullah poses a potential health risk to human beings or the environment by draining into a watercourse.

2. In the statement of water quality objectives for the watercourses in the Tolo Harbour and Channel Water Control Zone, the subzones are defined as follows-

Shing Mun River	:	SM(A), SM(B), SM(C), SM(D), SM(E), SM(F), SM(G), SM(H), SM(I).
Lam Tsuen River	:	LT(C), LT(D).
Tai Po River	:	TP(A), TP(B), TP(C).
Other watercourses	:	All other watercourses except those within the above defined subzones.