New South Wales Consolidated Regulations

WATER SHARING PLAN FOR THE MANDAGERY CREEK 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 1.48 megalitres/day (hereafter "ML/day"),

Note: 1.48 ML/day is referred to as the cease to pump level on a falling river and a commence to pump on a rising river. It corresponds to the estimated 57th percentile of all days flow .

(ii) A class flows greater than 1.48 ML/day and at or less than 6 ML/day,

(iii) B class flows greater than 6 ML/day and at or less than 50 ML/day, and

(iv) C class flows greater than 50 ML/day.

(b) For Zone 2:

(i) very low flow class at or less than 3.9 ML/day,

Note: 3.9 ML/day is referred to as the cease to pump level on a falling river and a commence to pump on a rising river. It corresponds to the estimated 85th percentile of all days flow.

(ii) A class flows greater than 3.9 ML/day and at or less than 21.7 ML/day,

(iii) B class flows greater than 21.7 ML/day and at or less than 100 ML/day, and

(iv) C class flows greater than 100 ML/day.

(c) For Zone 3:

(i) very low flow class at or less than 4.8 ML/day,

Note: 4.8 ML/day is referred to as the cease to pump level on a falling river and a commence to pump on a rising river. It corresponds to the estimated 53rd percentile of all days flow.

(ii) A class flows greater than 4.8 ML/day and at or less than 24 ML/day,

(iii) B class flows greater than 24 ML/day and at or less than 120 ML/day, and

(iv) C class flows greater than 120 ML/day.

(d) For Zone 4:

(i) very low flow class at or less than 12 ML/day,

Note: 12 ML/day is referred to as the cease to pump level on a falling river and a commence to pump on a rising river. It corresponds to the estimated 73rd percentile of all days flow.

(ii) A class flows greater than 12 ML/day and at or less than 157 ML/day, and

(iii) B class flows greater than 157 ML/day and at or less than 400 ML/day, and

(iv) C class flows greater than 400 ML/day.

(e) For Zone 5, very low flow class at or less than 4.1 ML/day.

Note: The 4.1 ML/day in subclause (e) is referred to as the cease to pump level on a falling river and a commence to pump on a rising river.

(f) For Zone 6, no flow classes are established by this Plan.

Note: All water supply works located in Zone 6 are subject to the condition stated in clauses 22 and 67 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.