Water Availability Report

Transcription

1 Water Availability Report Authorised by Dan Berry Manager Water System Operations (2) May 218 Table of Contents Overview... 2 System Risks... 2 Climatic Conditions Month Forecast Climatic Conditions... 3 Valley Based Operational Activities... 3 Murray Valley... 5 Lower Darling Valley... 5 Murrumbidgee Valley... 6 Lachlan Valley... 9 Macquarie Valley Namoi Valley... 9 Gwydir Valley Border Rivers Barwon Darling River System... 2 Bega River Hunter Valley Toonumbar Dam WaterNSW (Rural) Dam Levels Subscribe here for updates to the Water Availability Report. For Greater Sydney Water Availability, please follow the below link: Page 1 of 27

2 Overview WaterNSW manages and operates 42 dams and storages to deliver water for environmental, domestic, town water, stock, industrial and irrigation purposes across the state. WaterNSW storages provide supplies to all of the major river systems in Western NSW, Greater Sydney, the Southern Highlands, Shoalhaven Bay as well as the Hunter, Bega, and Iron Pot valleys in coastal NSW. The total active storage percentage of rural water supplies on 14 May 218 was 48.5% of the total active storage capacity. This was an increase of.1% from last week. The total storage level of urban water supplies on 14 May 218 was 71.9% of the total storage capacity. This was a decrease of.6% from last week. System Risks Temporary Water Restrictions remain in place on the Barwon Darling system from Mungindi to Menindee Lakes. The restrictions are in place to provide protection to environmental flows that have been released in the Border Rivers and the Gwydir Valley as part of the Northern Connectivity Event. If additional inflow is generated from rainfall events during the temporary restriction, the volume of water associated with the Northern Connectivity Event will be assessed as well as the inflow volumes to determine what extractions can occur. Releases are still in transit and underway in both the Border and Gwydir valleys as part of the Northern Connectivity event. Drought contingency measures (block releases) will be needed in the Namoi and Gwydir valleys to deliver the small volumes remaining in customer accounts if conditions remain dry in 218/19. Cease to flow conditions continue below Gunidgera Weir in the Lower Namoi Valley. Menindee Lakes continues to be below the 48GL trigger for NSW control, and reduced releases have been implemented to extend drought security. These lower releases increase the possibility of; access problems with very low flows, and decreasing water quality. Low flows in the Lower Murrumbidgee in general and possible cease to flow conditions in anabranches such as Beavers Ck Old Man Creek. Page 2 of 27

3 Climatic Conditions Figure 1 - Weekly rainfall totals for New South Wales (w/e 14 May 218) A strong high-pressure system southwest of the Bight is very slowly moving east strengthening a ridge to the Tasman Sea. There is negligible forecast rainfall in the next 7 days. Figure 2a First 4-day Forecast (14 17 May 18) Figure 2b Following 4 day forecast (18-21 May 18) Page 3 of 27

4 3 Month Forecast Climatic Conditions The May to July rainfall outlook, issued 26 April 218, indicates little shift towards wetter or drier conditions over most of NSW except the far south-east corner. May to July daytime temperatures are likely to be warmer than average for southern Australia. Night-time temperatures are likely to be warmer than average for large parts of southern Australia. The El Niño Southern Oscillation (ENSO) in the tropical Pacific Ocean is neutral neither El Niño nor La Niña and is expected to remain neutral through the coming season. The Indian Ocean Dipole (IOD) is also neutral, with the possibility of a negative IOD event forming during winter. With mostly neutral climate drivers, there is no strong push towards broad scale wetter or drier conditions across the country. Figure 3 - Three-month rainfall outlook Page 4 of 27

5 Valley Based Operational Activities Murray Valley Storage Status Hume Dam is currently at 31% of active capacity, releasing about 1,1 ML/d. Predicted Release Patterns Releases from Hume Dam will remain near minimums. The flow at downstream Yarrawonga Weir is approximately 6,6 ML/d and is expected to be gradually increased to about 8,ML/day as drawdown of Lake Mulwala continues. Edward River Offtake is currently about 1,15ML/d and is likely to remain relatively steady to the end of the week. Gulpa Creek Offtake is currently about 22ML/d and is likely to remain relatively steady. Stevens Weir will continue to be gradually lowered at 1 to15 mm /day. The flow at downstream Stevens Weir is currently about 1,45 ML/d. The flow downstream of Stevens Weir is expected to gradually decrease to about 1,ML/d over the next week. Operating Conditions Diversions into Colligen Creek (27ML/d) will be managed as per normal system demands as well as to manage the excess flows in the system due to irrigation channel drainage. Yallakool Creek (2ML/d) and Wakool River offtake (cease to flow) are fully open and the offtake flows are gradually falling as the Stevens Weir is being lowered for the end of season. As a result Wakool river reaches to Gee Gee bridge are likely to gradually reduce to cease to flow conditions over the next two weeks. Flow at Mallan School is currently about 24ML/d and is likely to decrease over the week before recovering to about 18ML/day over the next two weeks. Inflows from the Murrumbidgee River are about 29 ML/d and the end of system flow target in May is about 297ML/day. Lake Victoria is currently holding about 237 GL or 24% of active capacity. The flow to South Australia is about 3,5 ML/d and expected to remain steady over the next two weeks. Potential Blue Green Algae issues. o Hume Dam: Results for 23/4 indicate that there is green alert at the dam wall site. Other sites have no alerts. o Lake Victoria outlet regulator (23/4) is at Amber alert. o Murray R below Yarrawonga and at Picnic Point are on green alert. o Edward R. at Deniliquin and at Moulamein (7/5) are on Green alert o For more information visit: Planned Supply Interruptions: From this week, lowering of Lake Mulwala will continue aiming to reach m AHD by the start of June where it will be held at that level until mid-july. The refilling of the weir would commence by mid-july. Stevens Weir pool level is being gradually lowered in accordance with regulatory requirements. The lowering will provide suitable conditions for important maintenance at Wakool River regulator, Yallakool Creek regulator, Colligen Creek Weir and Stevens Weir. Customer Notice Page 5 of 27

6 Lower Darling Valley Storage Status The lakes currently hold an active volume of about 176 GL or about 11% of active capacity. The total storage is about 224 GL. Lake Menindee has been dry since 6 Feb 218. Predicted Release Patterns Release from Lake Pamamaroo is about 21ML/d, primarily to meet the flow targets of about 16ML/d at Weir 32 and at least 2ML/d at Burtundy. Operating Conditions Flows from upper Darling river system have started arriving at Wilcannia from 4 th May 218, with a flow of about 28ML/day. The estimated inflow to lake system is expected to be less than 1GL. The net evaporation loss over the last week was about 2,941ML. The average pan evaporation rate at Menindee over the last week was about 4.1mm, which is about 2% higher than the climatic average for the month of May. The total storage of Menindee Lakes reached the 48GL trigger for NSW control of the lakes on 16 December 217. The releases from the storages will be managed as per the Lower Darling Annual Operations Plan until the storage volume next exceeds 64GL. For more information visit: Lower-Darling Operational Plan The current flow rate at Burtundy is about 67ML/d and is expected to remain relatively steady over the next week. As planned, a temporary bank has been installed between Lake Wetherell and Lake Tandure. Pumping started on 25 March 218 to transfer water at about 21ML/d into Lake Wetherell as part of the measures to reduce evaporation losses from Lake Tandure. Potential Blue Green Algae issues. The following warnings are current for the various sampling locations within the Menindee Lake System and Lower Darling River immediately downstream of the storages. o Results show amber alert at Lake Wetherell Site 3, Site 4 and Tandure site 8 o The Wetherell site 2, Lake Pammamaroo site 9, 1, and Copi Hallow are on green alert o Darling R (17/4) at Pooncarie is on green alert and Burtundy (23/4) continues to be at Red Alert. o For more information visit: water-quality-algae Planned Supply Interruptions Nil Page 6 of 27

7 Murrumbidgee Valley Storage Status Burrinjuck Dam is currently at about 4% releasing about 31 ML/d. Blowering Dam is about 48% releasing about 9 ML/d. Predicted Release Patterns Release from Burrinjuck Dam will continue as per the Plan rules at about 3ML/day. The system demand is primarily being met from Blowering Dam. It is forecast that the release from Blowering Dam is likely to increase marginally this week with increased system demands. The current diversion into Yanco Creek is about 35 ML/d. The Beavers Creek Offtake is fully open and the flow is about 15 ML/d. The current flow at Kywong is around 5ML/d, which is likely to reduce over this week. There are no operational flow targets between May and August and hence the offtake regulator gates will remain fully open during this period. The lower levels in Murrumbidgee River may lead to lower flows or cease to flow conditions in the Beavers Ck and Old Man Ck systems over coming weeks. A customer notice has been issued on 27 March 218 to alert the customers and landholders on the flow situation. Customer Notice Operating Conditions The mid-may resource assessment resulted in Department of Industry - Water (DOI-W) announcing a 4% allocation increase to general security licences. The resource improvements were mainly due to continued discretionary releases from Snowy Hydro. Customers are reminded to check their account balances as this increased allocation and the 3% carryover limit may lead to account forfeits at the end of June, and that Murrumbidgee trading closes at the end of May. Valley average carryover is forecast to be around 26%. Re-regulation storages are being actively used to capture any excess system flows and to meet the downstream demands. Bundidgerry is currently about 8%, Tombullen at about 47%, Hay Weir at about 67%, and Maude Weir at about 1%. Redbank Weir gates have been raised clear of water. The structure has been handed over to the maintenance team. The stream levels upstream of Redbank weir will remain low for next few weeks as a number of structures that control flows into Lowbidgee area also undergo winter maintenance activities. Environmental water is being delivered to North Caira channels for Southern Bell Frog habitat. The current diversion is likely to remain around 16ML/day for next three weeks. The weather has generally been very dry in the irrigation areas. With end of season, Coleambally Irrigation Main Canal offtake is planned to be closed off this week. Sturt Canal offtake by Murrumbidgee Irrigation is set to close off for winter maintenance by end of May. The river sections downstream of Gogeldrie Weir to the Murray confluence may experience low river levels, particularly between Gogeldrie Weir to the influence of the Hay Weir, and downstream of Redbank Weir to the Murray confluence. Customers should take the necessary steps to adjust their pumping activities accordingly and monitor the river level closely. Customer Notice Flows at Balranald are currently about 29 ML/d and are expected to remain relatively steady closer to the end of system flow target of about 297 ML/d. The current flow at Darlot is about 21ML/d and is likely to gradually reduce to about 6ML/d over the next two weeks. Page 7 of 27

8 Inter Valley Transfer (IVT) account from Murray to Murrumbidgee closed on 2 October 217. The current balance is GL. Murrumbidgee to Murray trade remains open till 31 May, while the IVT balance is below 1GL. Potential Blue Green Algae issues. o A Red alert is current for Goodhope in Burrinjuck Dam. o The red alerts for Leonard Street and Hay Weir Boy Sites in Hay Weir Pool have been o lifted. Both sites now have an Amber status. There are Green alerts for Burrinjuck Dam at Woolgarlo, Burrinjuck Station 1 (Dam Wall), Burrinjuck Downstream, Blowering Station 1 (Dam Wall) and Murrumbidgee at Carathool. o Lake Albert in Wagga Wagga is still in a state of Red alert o Samples from other sites have no alert. o Note: The alert levels apply to non-consumptive or recreational contact. Drinking water safety thresholds are much more stringent o For more information visit: water-quality-algae Planned Supply Interruptions Activities for the seasonal maintenance of Redbank Weir have commenced and other structures between Maude and Redbank Weirs will also be taken over for maintenance in the next couple of weeks. Planning is underway for winter maintenance at other structures. It is expected that by end of May or early June the control gates would be fully withdrawn from water in the Gogeldrie Weir, Tombullen Storage and Hay Weir. Maintenance of Berembed Weir is delayed due to winter water supply to Murrumbidgee Irrigation and will be taken up in July 218. Page 8 of 27

9 Burrinjuck Dam Forecast Storage Capacity Updated mid-april Jul-16 Aug-16 Oct-16 Dec-16 Feb-17 Apr-17 Jun-17 Aug-17 Oct-17 Dec-17 Feb-18 Apr-18 Jun-18 Aug-18 Oct-18 Dec-18 Feb-19 Apr-19 End of Month Storage (GL) Jun-19 Jul-16 Aug-16 Oct-16 Dec-16 Feb-17 Apr-17 Jun-17 Aug-17 Oct-17 Dec-17 Feb-18 Apr-18 Jun-18 Aug-18 Oct-18 Dec-18 Feb-19 Apr-19 Jun-19 End of Month Storage (GL) Extreme dry scenario (99%) Dry Scenario (8%) Average scenario (5%) Wet scenario (2%) Actual * Including Snowy releases Blowering Dam Forecast Storage Capacity Updated mid-april Extreme dry scenario (99%) Dry Scenario (8%) Average scenario (5%) Wet scenario (2%) Actual * Including Snowy releases Page 9 of 27

10 Lachlan Valley Storage Status Carcoar Dam is at 55% and releases have averaged about 25 ML/d during the last week. Wyangala Dam is at 64% and releases have averaged about 1,5 ML/d during the last week. Predicted Release Patterns The releases from Carcoar Dam are expected to be around 4 ML/d during the week. The releases from Wyangala Dam are at 1,ML/d and are expected to stay the same for the week. In the Lower Lachlan, the releases at Brewster have been averaging around 3 ML/d. Of this about 16 ML/d is for normal demand with an additional 14 ML/d released as ECA and licenced environment water that will be shepherded to Booligal creating a small fish pulse. The small fresh is targeted at a minimum flow of 15 ML/d over ten days at Booligal. Operating Conditions As releases from Wyangala Dam are receding, a minimum flow target of 35 ML/d has been set at downstream Jemalong Weir to ensure adequate flows into Island Creek and Wallamundry Ck system to meet demand for autumn watering. It is estimated that a combined dam and tributary inflow volume in excess of 47, ML is required in May before a further allocation could be made in the Lachlan River. Inflows received in April were negligible. Lake Cargelligo storage is currently at 57% and it is planned to store some additional water in the lake before starting the maintenance works on the Jemalong Weir in late June. The extra storage will be used to maintain supplies in the lower Lachlan during the outage. As of 3 April 218, Lake Brewster was at 1.3% holding about 1.8 GL totally with about.3 GL in the main storage. Latest BGA samples show that Willandra Weir, Lake Brewster outlet channel, Lake Cargelligo Outlet and Boatshed are all on green alert. Lake Brewster Regulator C is on amber alert. Delivery of annual stock and domestic replenishment flows to effluent creeks in the lower Lachlan will likely be staggered. Flows to Merrowie Creek will commence in mid-may 218, Merrimajeel/Muggabah in June 218 and Willandra Creek in mid-august 218 Carryover into in Lachlan River is expected to be about 372GL, equivalent to about 63% of general security share components. As of 31 March 218, net allocation assignment (temp trade) from upstream to downstream of Lake Cargelligo Weir was 48,517 ML. As the net allocation assignment to downstream is limited to 82, ML, there is room for another 33,483 ML to be traded down. This higher trade across the Lake Cargelligo barrier has been made possible due to the amendment of the original WSP trade limit of 32, ML to 82, ML in December 212. Page 1 of 27

11 Planned Supply Interruptions Planned maintenance works on Jemalong Weir is scheduled for June/July 218. The Jemalong Weir pool is likely to be drawn down from mid-june and restored on completion of works at the end of July. During this period, a very low flow is likely to be maintained past the weir. Details are in Customer Notice Account spill and reset of general security allocations If WaterNSW were to commence dam releases to maintain airspace in Wyangala Dam, it will trigger an account spill and reset of general security allocation accounts, high security spillable sub-accounts and the conveyance licence account as per section 56 of the Lachlan WSP. The Department of Industry - Water has announced that if there is an account spill and reset there will be no further reset in the following 6 months. Page 11 of 27

12 Macquarie Valley Storage Status Burrendong Dam is currently at 37% and Windamere Dam is at 41% capacity. Predicted Release Patterns Currently releases from Burrendong are around 35 ML/d and are planned to be in between 3-35ML/d during the week. Releases from Windamere are currently around 53ML/d and are planned to stay around 5-55ML/d for rest of the week. Operating Conditions All the current releases from Burrendong Dam are for irrigation, town water demand, minimum flow targets and S&D replenishment in Marra Creek. The flows downstream of Marebone Weir in the river and in the creek have now been restored. It is planned to deliver the basic landholder rights intermittently in this part of the system during these cooler months. Releases from Marebone Weir pool will be scheduled to ensure no more than 7 to 1 days gap in flows. Stock & Domestic replenishment flows into Marra creek started on 26 th April, a flow of around 1ML/d is being targeted. Stock and domestic replenishment flows to lower Macquarie River and to lower Bogan River are likely to be delivered in winter 218. The timing of all S&D deliveries thereafter in 219 will depend on rainfall events, dam inflows, and contributions from downstream tributaries. It is estimated that inflows more than 177 GL are required in May before an increment in Available Water Determination can be made. Inflows to Burrendong Dam in May to date have been negligible. It is forecasted that about 385 GL of licenced water may be extracted for irrigation and environment this water year. Carryover into in the Macquarie River is forecast to be equivalent to about 33GL or 54% of general security share component. Carryover into in Cudgegong River is forecast to equivalent to about 114% of share component. The Dept of Industry - Water allocation statement dated 11 May 218 confirmed that the forecast usage in , including environmental watering plans, is deliverable from the stored water currently in Burrendong and Windamere Dams. A bulk water transfer from Windamere Dam may be required, commencing in November 218, if conditions remain dry. Under very dry conditions, deliveries in will require water conservation initiatives to reduce losses. This may involve implementation of water order debiting and, where feasible, block releases of irrigation orders in lower parts of the Macquarie River. Algal sampling results from 3 th April 218 at Burrendong have detected a green alert level at the dam wall and no alert level at the downstream. The Red Alert at Lake Burrendong have been reduced to a Green Alert. Windamere Dam remains on Red Alert following results from sampling on 3rd May 218. Cudgegong River downstream of Windamere Dam is on Amber Alert. The position of the trash rack at Windamere Dam is currently m below the surface. Works to reinstate the temperature curtain at Burrendong Dam have re-commenced. Page 12 of 27

13 Planned Supply Interruptions Maintenance and repair work at Marebone Bk offtake has been rescheduled to the beginning of June 218, and planned for completion by end of June 218. During this time, a minimum flow will be made available through the regulator to meet Stock and Domestic requirements in the regulated Bulgeragar Creek. Page 13 of 27

14 Namoi Valley Storage Status Keepit Dam is at 13%, Split Rock Dam is at 15% and Chaffey Dam is at 64% of active capacity. Predicted Release Patterns Release of water for the Commonwealth Environmental Water Holder from Keepit Dam for stream connectivity to Narrabri will cease this week. There is expected to be a break between cessation of environmental releases and when environmental flows from the Peel arrive with Peel deliveries delayed pending approvals. Split Rock Dam is releasing around 3 ML/d to deliver about 1 ML/d to Upper Namoi water users. Releases are likely to remain relatively stable throughout the week. Chaffey Dam releases will likely reduce slightly from the current 1 ML/d and are forecast to remain relatively stable for the next week around 8ML/day. Demand has been split between Tamworth City of approximately 3 ML/d and industry use of around 2 ML/d. Discussion is continuing in relation to the use of the ECA and Commonwealth held water in the Peel Valley for use this water year, though it is possible that releases will commence around late May. Operating Conditions No rainfall was recorded throughout the week. There is no significant rain forecast for the next week. Temperatures dropped significantly last week and are forecast remain in the low 2 s. Irrigation demand in the lower Namoi has ceased, though environmental deliveries continue to maintain stream connectivity to Narrabri. Environmental (general security) releases from Keepit will likely continue until mid-week when approved delivery volumes are exhausted. Mining watering requirements will continue to be supplied in conjunction with environmental flows throughout May 218. It is likely that some additional environmental deliveries may commence in late May in the Peel valley. Recent sampling for BGA indicates that Split Rock remains at amber alert, whilst Chaffey and Keepit Dams remain on green alert. Under minimum inflows and forecast demand the combined storage levels of Split Rock and Keepit are forecast to be just below 12GL by June this year. If the combined storage is above 12GL, the end of system flows will be required to be delivered while the combined storage is above 12GL. If no rainfall is received, additional volumes of water will be released from Keepit in late May to assist in providing stock and domestic supplies and any irrigation requirements for the winter growing period in the Lower Namoi Valley in combination with any inflows from tributaries. If conditions remain dry, remaining water in licences will be delivered via a complete block release strategy throughout 218/19. It is likely that only one release will occur during the winter months (as mentioned above), one release in October and another starting in late December and continuing until mid to late January 219. Releases for users upstream of Mollee will occur every 6 to 8 weeks once environmental deliveries cease. Customers are advised to take this into account when undertaking planning for next year s cropping program. Page 14 of 27

15 May-17 Jul-17 Aug-17 Sep-17 Oct-17 Nov-17 Dec-17 Jan-18 Feb-18 Mar-18 Apr-18 May-18 Jun-18 Jul-18 Aug-18 Sep-18 Oct-18 Nov-18 Dec-18 Jan-19 Feb-19 Mar-19 Apr-19 May-19 Jun-19 Jul-19 Aug-19 Sep-19 Oct-19 Nov-19 Dec-19 Jan-2 Feb-2 Mar-2 Apr-2 Gigalitres (GL) Flow in the lower reaches of the Namoi and Pian Ck systems has ceased. Cease to flow conditions are now present at multiple locations. Supply on demand will continue for the Upper Namoi and the Peel Valley, though customers will notice reduced river levels. Planned Supply Interruptions Mollee fish way is currently unavailable due to infrastructure failure. Both Mollee and Gunidgera are planned to be emptied by the 2 th June 218 to undertake maintenance work and will only be replenished in October if there are not any additional tributary flows. Keepit forecast storage volume 45 Actual Minimum 99% COE DRY 8% COE Median 5% COE WET 2% COE Page 15 of 27

16 May-17 Jul-17 Aug-17 Sep-17 Oct-17 Nov-17 Dec-17 Jan-18 Feb-18 Mar-18 Apr-18 May-18 Jun-18 Jul-18 Aug-18 Sep-18 Oct-18 Nov-18 Dec-18 Jan-19 Feb-19 Mar-19 Apr-19 May-19 Jun-19 Jul-19 Aug-19 Sep-19 Oct-19 Nov-19 Dec-19 Jan-2 Feb-2 Mar-2 Apr-2 May-17 Jul-17 Aug-17 Sep-17 Oct-17 Nov-17 Dec-17 Jan-18 Feb-18 Mar-18 Apr-18 May-18 Jun-18 Jul-18 Aug-18 Sep-18 Oct-18 Nov-18 Dec-18 Jan-19 Feb-19 Mar-19 Apr-19 May-19 Jun-19 Jul-19 Aug-19 Sep-19 Oct-19 Nov-19 Dec-19 Jan-2 Feb-2 Mar-2 Apr-2 Gigalitres (GL) Split Rock - forecast storage volume Actual Minimum 99% COE DRY 8% COE Median 5% COE WET 2% COE Chaffey Dam - forecast storage volume actual Minimum 99% COE DRY 8% COE Page 16 of 27

17 Gwydir Valley Storage Status Copeton Dam is at 27% of active capacity. Predicted Release Patterns Releases for Commonwealth and OEH environmental deliveries have now ceased. No further releases are expected until early July when environmental deliveries are expected to commence. Operating Conditions No significant rainfall was recorded over the past week and temperatures were mostly in the mid-2s. Forecast temperatures are to remain in the low 2 s for the remainder of the week. Commonwealth environmental flows are have ceased in upper sections. Carole deliveries at the offtake are complete with remaining orders expected to be met with channel drainage. Mehi deliveries from Tareelaroi are likely to continue till late week. Additional environmental deliveries are expected to commence during July 218. Environmental flows reached Garah on 24 April and arrived at Galloway Gauge (the last gauge on the Gil Gil creek system before the Barwon) on the 29 April, approximately 4,45 ML of the ML has been delivered on the Carole Creek as measured at Garah, with target flows ceasing in the next couple of days. Flows also reached Gundare on the Mehi River on the 24 April and arrived at Collarenebri Gauge on the 2 May, approximately 12,511 ML of the ML has been delivered on the Mehi as measured at Gundare, with target flows reducing over the next week. Consultation with customers in relation to limited water deliveries next season has begun. It is forecast that there will be less than 5GL (about 1% of general security share components) available for industry production at the end of 218 summer growing season and approximately 145GL of environmental water. If conditions remain dry the delivery of remaining volumes will need to be managed so that essential supplies can be met going forward. Block releases will be required on western effluent streams and discussions will continue with customers around delivery options through winter. Recent Blue Green Algae (BGA) sampling at Copeton shows a continuation of amber alert. Planned Supply Interruptions No supply interruptions are expected, though planning is underway to undertake inspections and maintenance activities during late May/June. Copeton maintenance is planned for June, discussions and planning continue in an attempt to ensure that interruption to potential environmental releases is minimised. Page 17 of 27

18 May-17 Jul-17 Aug-17 Sep-17 Oct-17 Nov-17 Dec-17 Jan-18 Feb-18 Mar-18 Apr-18 May-18 Jun-18 Jul-18 Aug-18 Sep-18 Oct-18 Nov-18 Dec-18 Jan-19 Feb-19 Mar-19 Apr-19 May-19 Jun-19 Jul-19 Aug-19 Sep-19 Oct-19 Nov-19 Dec-19 Jan-2 Feb-2 Mar-2 Apr-2 Gigalitres (GL) Copeton - forecast storage volume Actual Minimum 99% COE DRY 8% COE Median 5% COE WET 2% COE Page 18 of 27

19 Border Rivers Storage Status Pindari Dam is at 59%. Glenlyon is at 5%. Predicted Release Patterns Pindari releases remain at minimums of 1 ML/d. Releases are expected to maintain at this level for the next week. Glenlyon releases have reduced to around 5 ML/day to supply users in upper sections. Environmental deliveries have ceased from Boggabilla and will continue to drain out of the system. Water reached Mungindi 4 th May with flows currently 27 ML/day and reducing. Operating Conditions No significant rainfall was recorded throughout the week. Temperatures were predominantly in the high 2 s with a reduction Friday. Temperatures are forecast to remain in the low 2 s for the remainder of the week. Large irrigation demand in the Border has ceased and it is likely only minor releases from Pindari and Glenlyon will be required to satisfy the smaller irrigation enterprises east of Goondiwindi. Approximately 8 GL of releases have been made at Glenlyon. Environmental flows have reached Mungindi at a flow rate of approximately 4ML/day, approximately 3 4ML has been delivered with a target flow of around 4 ML. No significant winter demand is forecast. Recent BGA sampling at Pindari shows a green alert level is maintained. Customers and landholders are encouraged to ensure that they have adequate stock and domestic supplies while there are current flows available. Planned Supply Interruptions No supply interruptions are currently forecast. Page 19 of 27

20 May-17 Jul-17 Aug-17 Sep-17 Oct-17 Nov-17 Dec-17 Jan-18 Feb-18 Mar-18 Apr-18 May-18 Jun-18 Jul-18 Aug-18 Sep-18 Oct-18 Nov-18 Dec-18 Jan-19 Feb-19 Mar-19 Apr-19 May-19 Jun-19 Jul-19 Aug-19 Sep-19 Oct-19 Nov-19 Dec-19 Jan-2 Feb-2 Mar-2 Apr-2 Gigalitres (GL) May-17 Jul-17 Aug-17 Sep-17 Oct-17 Nov-17 Dec-17 Jan-18 Feb-18 Mar-18 Apr-18 May-18 Jun-18 Jul-18 Aug-18 Sep-18 Oct-18 Nov-18 Dec-18 Jan-19 Feb-19 Mar-19 Apr-19 May-19 Jun-19 Jul-19 Aug-19 Sep-19 Oct-19 Nov-19 Dec-19 Jan-2 Feb-2 Mar-2 Apr-2 Gigalitres (GL) Pindari forecast storage volume Actual Minimum 99% COE DRY 8% COE Glenlyon forecast storage volume Actual Minimum 99% COE DRY 8% COE Page 2 of 27

21 Barwon Darling River System River Flow Status Environmental flows at Mungindi are forecast to recede over the next 7 days. Approximately 3,4 ML has been delivered to Mungindi of the 4,ML ordered. No additional flows are present from the Moonie River. Environmental flows from the Carole/Gil Gil continues to reach the Barwon. Flow peaked around 24 ML/d, approximately 4,45ML of the 4,634ML has been delivered as measured at Garah, with delivery expected to be completed in the next two to three days. Mehi flows have also reached end of system with flows arriving at Collarenebri 2 May. Flow has peaked around 7 ML/day, approximately 12,75ML of the 13,894ML has been delivered on the Mehi as measured at Gundare and Moomin Plains, with target flows reducing from 4ML/d over the remainder of the week. Flows from the lower Namoi have ceased and no increase is expected to occur until at least late June. Walgett Weir has commenced flowing and is expected to reach a peak flow of approximately 1,2ML by 16 May and will start to decrease by the end of the week. No inflows from the Macquarie valley are current or are expected without additional rainfall. Flows reached Boorooma on the 13 th May and are currently around 6ML/day and expected to peak on the 19 th May. Flows at Brewarrina have reduced to below 2 ML/d and are not expected to increase until flows arrive around the 17/18 May. No flows are current from the Culgoa system. Flows have reduced to around 2ML/d at Bourke while flows are expected to reach Bourke around the 22/23 May. Flows have reduced to below 2ML/d at Louth, with flows likely to increase around the 3/31 May. Flow has reduced to around 4ML/d at Tilpa with flows likely to increase around the 7/8 June. Flows are currently around 2ML/d at Dicks Dam on the Warrego and will continue to reduce over the coming week. Flows filled the Wilcannia Weir pool on Friday 4 May and commenced flowing downstream at around 4ML/d. Flows will continue at low levels until mid/late June when they will increase as part of the Northern connectivity event. Predicted Flow Patterns Flows will increase over the coming weeks as the Northern Connectivity event works through the system, flows are likely to increase at Brewarrina by 16 May and arrive at Bourke by the 22 May. Flows are likely to reach Wilcannia by mid-june. Operating Conditions A new section 324 Temporary Water Restriction order has been issued as at 29 April. Temporary restrictions on A, B and C class water access licences in the Barwon-Darling Unregulated River are in place to protect flows released as part of the Northern Connectivity Flow Event and will be in place until 22 June 218. The pump restriction limits the taking of water to: o Town water supply o Domestic use o Stock watering Page 21 of 27

22 WaterNSW HYPLOT V133 Output 15/5/218 Period 5 Month 1/1/218 to 1/6/ BARWON MUNGINDI 141. Discharge (ML/d) CP BARWON U/S PRESBURY 141. Discharge (ML/d) CP 4224 MOGIL MOGIL 141. Discharge (ML/d) CP 4223 Discharge (ML/d) CP TARA 141. Discharge (ML/d) CP 4221 DANGAR BDGE141. Discharge (ML/d) CP BOOROOMA 141. Discharge (ML/d) CP GEERA 141. Discharge (ML/d) CP Jan Feb Mar Apr May WaterNSW HYPLOT V133 Output 15/5/218 Period 5 Month 1/1/218 to 1/6/ BREWARRINA 141. Discharge (ML/d) CP BEEMERY 141. Discharge (ML/d) CP DARLING@WARRAWEENA 141. Discharge (ML/d) CP 4253 DARLING@BOURKE TOWN 141. Discharge (ML/d) CP 4254 DARLING@LOUTH 141. Discharge (ML/d) CP DARLING@TILPA 141. Discharge (ML/d) CP 4258 DARLING@WILC. MAIN C 141. Discharge (ML/d) CP 1 5 Jan Feb Mar Apr May Page 22 of 27

23 1/2/12 1/6/12 1/1/12 1/2/13 1/6/13 1/1/13 1/2/14 1/6/14 1/1/14 1/2/15 1/6/15 1/1/15 1/2/16 1/6/16 1/1/16 1/2/17 1/6/17 1/1/17 1/2/18 1/6/18 1/1/18 1/2/19 1/6/19 1/1/19 1/2/2 Storage % capacity Bega River Storage Status Brogo is currently at 9% of active capacity. Predicted Release Patterns Releases are currently at 25 ML/d via valves and will likely remain relatively stable throughout the week. Operating Conditions Regulated conditions are present throughout the system. Rainfall was limited to about 25mm throughout the past week. No further rainfall is forecast over the next week. Maximum temperatures are forecast to remain mid to high teens during the next 7 days. Recent BGA sampling at Brogo indicates a green alert level is maintained Brogo Dam - Forecast Storage Levels 14% 12% 1% 8% 6% 4% 2% % Actual Dry 8% COE Median 5% COE Wet 2% COE Minimum 99% COE Page 23 of 27

24 Hunter Valley Storage Status Glenbawn Dam is at 71%, while Glennies Creek Dam is at 7%, and Lostock Dam is 1% of active capacity. Predicted Release Patterns Releases at Glenbawn Dam are likely to reduce to around 1 ML/day unless AGL power station extends their current water order. Glennies Creek Dam releases are likely to remain around 2 ML/d. Lostock Dam is releasing about 1 ML/day via the small flow regulator. Operating Conditions No significant rainfall occurred throughout the past week. Recent BGA sampling at Hunter storages indicates a green alert is maintained at Glenbawn and Glennies Creek whilst Lostock is on red alert level. No further significant rain is forecast for the valleys throughout the next week. Maximum temperatures are forecast to remain around 2 degrees. Planned Supply Interruptions Nil Page 24 of 27

25 1/2/12 1/6/12 1/1/12 1/2/13 1/6/13 1/1/13 1/2/14 1/6/14 1/1/14 1/2/15 1/6/15 1/1/15 1/2/16 1/6/16 1/1/16 1/2/17 1/6/17 1/1/17 1/2/18 1/6/18 1/1/18 1/2/19 1/6/19 1/1/19 1/2/2 Storage % capacity 12% Lostock Dam - Forecast Storage Level 1% 8% 6% 4% 2% % Actual Dry 8% COE Median 5% COE Wet 2% COE Drought Page 25 of 27

26 1/2/12 1/6/12 1/1/12 1/2/13 1/6/13 1/1/13 1/2/14 1/6/14 1/1/14 1/2/15 1/6/15 1/1/15 1/2/16 1/6/16 1/1/16 1/2/17 1/6/17 1/1/17 1/2/18 1/6/18 1/1/18 1/2/19 1/6/19 1/1/19 1/2/2 Storage % capacity Toonumbar Dam Storage Status Toonumbar Dam is currently at 1%. Predicted Release Patterns Passing flows of approximately 2 ML/d. Operating Conditions Recent BGA sampling at Toonumbar indicates that an amber alert is maintained. 12% Toonumbar Dam- Forecast Storage Level 1% 8% 6% 4% 2% % Actual Dry 8% COE Median 5% COE Page 26 of 27

27 WaterNSW (Rural) Dam Levels The following table shows the current status of water supplies at 14 May 218 River Valley Capacity Current Status Storage Dam, Nearest Town (GL) % of active capacity Active (GL) Weekly change (GL) Comments Likelihood Allocations for 217/18 Supply Issues of fill and spill High Security General Security 1/7/17 Border Rivers Glenlyon Dam, Stanthorpe Qld Pindari Dam, Inverell 254 5% % 184 Low regulated releases <2% 1% 19.62% 9% Minimum releases 2% 1% 19.62% 9% Gwydir Valley Copeton Dam, Inverell % Minimum releases <5% 1% 17.59% 6% Namoi Valley Keepit Dam, Gunnedah Split Rock Dam, Manilla Chaffey Dam, Tamworth % % % 64-1 Environmental deliveries <2% 1% 7% 8% Releases for upper Namoi <5% 1% 1% N/A Regulated releases steady 5% 1% 1% N/A Macquarie Valley Burrendong Dam, Wellington Windamere Dam, Mudgee % % Releases steady 2% 1% 38% 73% Irrigation deliveries <5% 1% 38% 137% Lachlan Valley Wyangala Dam, Cowra Carcoar Dam, Carcoar % % 2 Releases steady 2% 1% 2% 18% Minimum releases 1% 1% % 95% Murrumbidgee Valley Burrinjuck Dam, Yass 123 4% 46 Minimum releases 2% 95% 45% 27% Blowering Dam, Tumut Murray Valley % Irrigation / environmental releases <2% 95% 45% 27% Dartmouth, Mitta Mitta (Vic) Hume Dam, Albury % % Minimum releases N/A N/A N/A N/A Minimum releases <25% 97% 51% 44% Lower Darling Menindee Lakes, Broken Hill % Minimum releases N/A 1% 1% 77% Hunter Valley Glenbawn Dam, Scone Glennies Ck Dam, Singleton 75 71% Regulated releases 2% 1% 1% 28% primarily power station use 282 7% Regulated releases 2% 1% 1% 28% Lostock Dam, Gresford 2 1% 2 - Spill reducing 9% 1% 1% N/A Coastal Area Toonumbar Dam, Kyogle Brogo Dam, Bega 11 1% % 8 - Dam spilling - reducing 1% 1% 1% N/A Regulated flow conditions 1% 1% 75% N/A TOTALS 17, % WaterNSW has water resources in Dartmouth, Hume and Glenlyon Dams. TWS = Town Water Supplies 1 Gigalitre (GL) = 1, Megalitres (ML) 1 ML = 1,, litres For information on WaterNSW (Urban) Dam Levels, follow this link: Page 27 of 27