Barwon-Darling Flow Class Announcement

Effective Date of Announcement: 9:00 AM, Wednesday, 6 Jan 2021 to 9:00 AM, Thursday, 7 Jan 2021 Announcement ID 11061

Note: If a Flow Class Announcement is not made for a period of time that applies after this Flow Class Announcement, then this Flow Class Announcement still applies.

Note: This Flow Class Announcement is made under the Water Sharing Plan for the Barwon-Darling Unregulated Water Source.

Table 1: Flow Class and adjusted CtP for each Water Management Zone

A class B class Adjusted Adjusted C class Adjusted Reference stations CTP (WSP CTP (WSP CTP (WSP CTP) Flow Flow share Management zone CTP) CTP) ML/Day class announcement ML/Day ML/Day U/S D/S U/S D/S U/S D/S U/S D/S Barwon River Yes. See to Boomi Barwon River at upstream of 398 319 430 413 430 1643 B announced flow River Mungindi Presbury Weir (198) (176) (230) (270) (230) (1500) class share for eligible (16221) (416001) (416050) volume.

WaterNSW ABN 21 147 934 787 169 Macquarie Street Parramatta NSW 2150 PO Box 398, Parramatta NSW 2124 T 1300 662 077 E [email protected] waternsw.com.au Boomi River Barwon River Yes. See Confluence to Barwon River at Low upstream of 319 220 413 230 413 1800 announced flow Upstream Mogil Mogil Mogil flow Presbury Weir (176) (220) (270) (230) (270) (1800) share for eligible Mogil Weir Pool (422004) class (416050) volume. (16222) Yes. See Barwon River at Low Mogil Mogil Weir 220 570 1800 announced flow Mogil Mogil flow Pool (16223) (220) (570) (1800) share for eligible (422004) class volume. Barwon River at Yes. See Downstream Mogil Barwon River at Low Collarenebri 220 317 570 500 570 2900 announced flow Mogil to Collarenebri Mogil Mogil flow Main Channel (220) (317) (570) (500) (570) (2900) share for eligible (16224) (422004) class (422003) volume. Yes. See Collarenebri to Barwon River at Low Barwon River at 317 100 500 430 500 3050 announced flow Upstream Walgett Collarenebri Main flow Tara (422025) (317) (100) (500) (430) (500) (3050) share for eligible Weir Pool (16225) Channel (422003) class volume. Yes. See Barwon River at Walgett Weir Pool 600 900 5650 A announced flow Dangar Bridge (16226) (600) (900) (5650) class share for eligible (422001) volume. Yes. See Downstream Barwon River at Barwon River at 600 400 900 870 900 5500 A announced flow Walgett to Dangar Bridge Boorooma (600) (400) (900) (870) (900) (5500) class share for eligible Boorooma (16227) (422001) (422026) volume. Yes. See Barwon River at Boorooma to Barwon River at 496 567 870 857 870 6817 B announced flow Brewarrina Brewarrina (16228) Geera (422027) (496) (550) (870) (840) (870) (6800) class share for eligible (422002) volume.

WaterNSW ABN 21 147 934 787 169 Macquarie Street Parramatta NSW 2150 PO Box 398, Parramatta NSW 2124 T 1300 662 077 E [email protected] waternsw.com.au Yes. See Brewarrina to Barwon River at Barwon River at 594 582 884 772 884 8262 B announced flow Brewarrina Beemery (550) (570) (840) (760) (840) (8250) class share for eligible Junction (16229) (422002) (422028) volume. Yes. See Culgoa River at Darling River at Low 646 606 1331 1251 1331 11001 announced flow Junction to Bourke Warraweena Bourke town flow (645) (605) (1330) (1250) (1330) (11000) share for eligible (16230) (425039) (425003) class volume. Darling River at No Bourke to Louth Darling River at 606 555 1251 1130 1251 11150 Bourke town flow No (16231) Louth (425004) (605) (555) (1250) (1130) (1250) (11150) (425003) class No Louth to Tilpa Darling River at Darling River at 555 505 1130 1010 1130 11000 flow No (16232) Louth (425004) Tilpa (425900) (555) (505) (1130) (1010) (1130) (11000) class Darling River at No Tilpa to Wilcannia Darling River at Wilcannia Main 505 455 1010 850 1010 12000 flow No (16233) Tilpa (425900) Channel (505) (455) (1010) (850) (1010) (12000) class (425008) Wilcannia to Yes. See Upstream Lake Darling River at Low 455 850 12000 announced flow Wetherell Wilcannia Main flow (455) (850) (12000) share for eligible Management Zone Channel (425008) class volume. (16234)

Table 2: Flow Advice — Indicative Flow Class Conditions

Most likely flow class for next few days Management zone 07/01/2021 08/01/2021 09/01/2021 10/01/2021 11/01/2021 12/01/2021 13/01/2021

WaterNSW ABN 21 147 934 787 169 Macquarie Street Parramatta NSW 2150 PO Box 398, Parramatta NSW 2124 T 1300 662 077 E [email protected] waternsw.com.au Mungindi to Boomi River Confluence (16221) B B Low Low Low No flow No flow Boomi River Confluence to Upstream Mogil Mogil Low Low Low Low Low No flow No flow Weir Pool (16222) Mogil Mogil Weir Pool (16223) Low Low Low A A No flow No flow Downstream Mogil Mogil to Collarenebri (16224) Low Low Low Low Low No flow No flow Collarenebri to Upstream Walgett Weir Pool (16225) Low Low Low Low Low No flow No flow Walgett Weir Pool (16226) A A A B B No flow No flow Downstream Walgett to Boorooma (16227) A A A A A No flow No flow Boorooma to Brewarrina (16228) B B B B B No flow No flow Brewarrina to Culgoa River Junction (16229) B B B B A No flow No flow Culgoa River Junction to Bourke (16230) A A A B A No flow No flow Bourke to Louth (16231) No flow No flow No flow No flow No flow No flow No flow Louth to Tilpa (16232) No flow No flow No flow No flow No flow No flow No flow Tilpa to Wilcannia (16233) No flow No flow No flow No flow No flow No flow No flow Wilcannia to Upstream Lake Wetherell Management Low Low Low Low No flow No flow No flow Zone (16234)

General flow advice and additional Information

• Inflow from the Border has arrived at Mungindi and has triggered B class flow conditions for the Mungindi to Boomi River Confluence Management Zone on 6 January 2021. • B class flow conditions are also in the Brewarrina to Culgoa River Junction Management Zone on 6 January 2021. • Flow conditions will change from B class to A class for the Walgett Weir Pool and Walgett to Boorooma Management Zones on 6 January 2021 • B class flow conditions continue for the Boorooma to Brewarrina Management Zone. • Inflow from the peaked at Goangra on 31 December 2020 and has already reached Walgett. A second peak is expected around the 10th of January.

WaterNSW ABN 21 147 934 787 169 Macquarie Street Parramatta NSW 2150 PO Box 398, Parramatta NSW 2124 T 1300 662 077 E [email protected] waternsw.com.au • Environmental water from the Gwydir Valley is expected to reach the Barwon-Darling via the Gil Gil during the second week of January. • A small inflow is also expected to arrive from the Gwydir system via the Mehi. • Some rainfall during the weekend resulted in flows at Beemery and Warraweena. The Bourke weir pool has filled from this rainfall event and started flowing on the evening of 4th January. • Some inflow is also expected from the Culgoa system. • Due to recent rainfall events, water is expected to flow downstream of Tilpa. Some water may reach Wilcannia but no inflow is currently forecast to arrive at Menindee. • Based on current forecasts, on the 12th January it is predicted that the flow at Wilcannia will have been below 200ML/day for more than 90 days. This will activate the Resumption of Flow rule for all Management Zones. Once the Resumption of Flow rule has been activated, access will not be available until the conditions for the relaxation of the Resumption of Flow rule have been met. • Licence holders are reminded to update their individual expression of interest via iWAS. • Licence holders can check their individual flow share announcements in iWAS account. Individual flow share announcements are also sent to registered email addresses and mobile numbers.

WaterNSW ABN 21 147 934 787 169 Macquarie Street Parramatta NSW 2150 PO Box 398, Parramatta NSW 2124 T 1300 662 077 E [email protected] waternsw.com.au