New South Wales Consolidated Regulations

WATER SHARING PLAN FOR THE UPPER BILLABONG 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 the Billabong Creek Management Zone very low flow class at or less than 1.84 megalitres per day (hereafter "ML/day"),

Note: The 1.84 ML/day in subclause (a) corresponds to the estimated 80 th percentile of flows in the critical month, and is referred to as the cease to pump on a falling river and the commence to pump on a rising river.

(b) for the Billabong Headwater Management Zone very low flow class at or less than 0.5 ML/day, measured at a pipe located directly down river of the site of extraction,

Note: The 0.5 ML/day in subclause (b) is referred to as the cease to pump on a falling river and the commence to pump on a rising river.

(c) for the Billabong Creek Management Zone A class flows greater than 1.84 ML/day and at or less than 4.1 ML/day,

(d) for the Billabong Headwater Management Zone A class flows greater than 0.5 ML/day measured at a pipe located directly down river of the site of extraction, and at or less than 4.1 ML/day at the flow reference point,

(e) for both management zones B class flows greater than 4.1 ML/day and at or less than 7.2 ML/day, and

(f) for both management zones C class flows greater than 7.2 ML/day.

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