New South Wales Consolidated Regulations

WATER SHARING PLAN FOR THE CASTLEREAGH RIVER ABOVE BINNAWAY WATER SOURCE 2003 - REG 17

17 Flow classes

This Plan establishes the following flow classes as the basis for sharing of daily flows:

(a) For Zone 1:

(i) very low flow class at or less than 3.3 megalitres per day (hereafter "ML/day"),

Note: 3.3 ML/day is referred to as the cease to pump on a falling river and the commence to pump on a rising river. It corresponds to the estimated 56th percentile of all days flow.

(ii) A class flows greater than 3.3 ML/day and at or less than 17.6 ML/day, and

(iii) B class flows greater than 17.6 ML/day.

(b) For Zone 2:

(i) very low flow class at or less than 3.1 ML/day,

Note: 3.1 ML/day is referred to as the cease to pump on a falling river and the commence to pump on a rising river. It corresponds to the estimated 58th percentile of all days flow.

(ii) A class flows greater than 3.1 ML/day and at or less than 20.4 ML/day, and

(iii) B class flows greater than 20.4 ML/day.

(c) For Zone 3:

(i) very low flow class at or less than 2.4 ML/day,

Note: 2.4 ML/day is referred to as the cease to pump on a falling river and the commence to pump on a rising river.

(ii) A class flows greater than 2.4 ML/day and at or less than 8.2 ML/day, and

(iii) B class flows greater than 8.2 ML/day.

(d) For Zone 4:

(i) very low flow class at or less than 3.3 ML/day,

Note: 3.3 ML/day is referred to as the cease to pump on a falling river and the commence to pump on a rising river. It corresponds to the estimated 80th percentile of all days flow.

(ii) A class flows greater than 3.3 ML/day and at or less than 17.8 ML/day, and

(iii) B class flows greater than 17.8 ML/day.

(e) For Zone 5:

(i) very low flow class at or less than 1.6 ML/day,

Note: 1.6 ML/day is referred to as the cease to pump on a falling river and the commence to pump on a rising river. It corresponds to the estimated 94th percentile of all days flow.

(ii) A class flows greater than 1.6 ML/day and at or less than 9.9 ML/day, and

(iii) B class flows greater than 9.9 ML/day.

(f) This Plan does not establish flow classes for Zone 6.

Note: All water supply works located in Zone 6 are subject to the condition stated in clauses 22 and 68 (d) which only allows water to be extracted where there is a visible flow in the river in the downstream vicinity of the water supply work.

Note: The flow classes have been determined based on flow information that inherently includes seasonal effects as well as evaporation and seepage losses.

Note: This Plan allows for a C class to be established in Zones 1 to 5 during its term under the provisions of clause 75.