Conservation of natural environment.
Water Supply I - Practically no treatment necessary.
Fishery I - Very sensitive aquatic species.
Water Supply II - Conventional treatment.
Fishery II - Sensitive aquatic species.
Class IIB Recreational use body contact.
Class III Water Supply III - Extensive treatment required.
Fishery III - Common,of economic value and tolerant species;livestock drinking.
Class IV Irrigation
Class V None of the above.