WaterNSW Operations update...2019/08/01 · Dam Storages 4 0% 10% 20% 30% 40% 50% 60% 70% 80% 90%...

WaterNSW

Operations update

Murrumbidgee Valley

August 2019

WaterNSW

3

Drought Situation

Update

WaterNSW

Water NSW © 2019 – Do not copy, cite or distribute without permission of Water NSW

Dam Storages

4

0%

10%

20%

30%

40%

50%

60%

70%

80%

90%

100%

110%

Jul Aug Sep Oct Nov Dec Jan Feb Mar Apr May Jun

Burrinjuck Dam storage

2014/15 2015/16 2016/17 2017/18 2018/19

Dam Storages

5

0%

10%

20%

30%

40%

50%

60%

70%

80%

90%

100%

110%

Jul Aug Sep Oct Nov Dec Jan Feb Mar Apr May Jun

Blowering Dam storage

2014/15 2015/16 2016/17 2017/18 2018/19

WaterNSW

Current Resource Breakdown 15 July 2019

6

7

NSW rainfall

8

NSW rainfall

9

NSW rainfall

10

Maximum temperature

11

Maximum temperature

Inflows are consistent with rainfall over

the past 6 months.

Actual inflow for the 6 months is 78 GL

in line with about 89 percentile inflows;

while the minimum is 36 GL


the past 12 months.


in line with about 99 percentiles; while

the minimum is 197 GL.

Burrinjuck Dam Inflows

12

0

100

200

300

400

500

600

700

Jan-19 Feb-19 Mar-19 Apr-19 May-19 Jun-19

Cu

mu

lativ

e In

flo

ws

(GL)

Burrinjuck Dam actual vs statistical inflows

6 months from Jan 2019

20 percentile 50 percentile 80 percentile Minimum Actuals

0

500

1000

1500

2000

2500

Jul-18

Au

g-1

8

Se

p-1

8

Oc

t-1

8

No

v-1

8

De

c-1

8

Jan

-19

Feb

-19

Ma

r-1

9

Ap

r-1

9

Ma

y-1

9

Jun

-19C

um

ula

tive

In

flo

ws

(GL)

Burrinjuck Dam actual vs statistical inflows

12 months from Jul 2018


These inflows are exclusive of Snowy

Hydro’s Required Annual Release

volumes.


the past 6 months.


in line with about 85 percentile inflows;

while the minimum is 24 GL

Inflows are consistent with rainfall

over the past 12 months.

Actual inflow for the 12 months is 180

GL in line with about 91 percentile

inflows; while the minimum is 78 GL. .

Blowering Dam Inflows

13

0

50

100

150

200


Cu

mu

lativ

e In

flo

ws

(GL)

Blowering Dam actual vs statistical inflows



0

200

400

600

800

Jul-18

Au

g-1

8

Se

p-1

8

Oc

t-1

8

No

v-1

8

De

c-1

8

Jan

-19

Feb

-19

Ma

r-1

9

Ap

r-1

9

Ma

y-1

9

Jun

-19

Cu

mu

lativ

e In

flo

ws

(GL)

Blowering Dam actual vs statistical inflows






GL in line with about 88 percentile

inflows; while the minimum is 40 GL




GL which is following 97 percentile

inflow condition; while the minimum

is 90 GL.

Tributary Inflows

14

0

50

100

150

200

250

300

350

400


Cu

mu

lativ

e In

flo

ws

(GL)

D/S Tributaries actual vs statistical inflows



0

200

400

600

800

1000

1200

1400

Jul-18

Au

g-1

8

Se

p-1

8

Oc

t-1

8

No

v-1

8

De

c-1

8

Jan

-19

Feb

-19

Ma

r-1

9

Ap

r-1

9

Ma

y-1

9

Jun

-19C

um

ula

tiv

e In

flo

ws

(GL)

D/S Tributaries actual vs statistical inflows



15

Drought Outlook

WaterNSWWater NSW © 2019 – Do not copy, cite or distribute without permission of Water NSW

16

Climate Outlook

ENSO Outlook

17

18

What are we doing

Now?

2019/20 Water Availability for

Murrumbidgee River

General Security Available Water Determination

Date AWD ML/Share Total %

Last non-zero general security

AWD was on 17 Sep 2018

0.01

19

Licence Category

Share

Component

Available

balance

AWD

Volume

Carryover

In

Allocation

Assignments

In

Allocation

Assignments

Out Usage

COLEAMBALLY IRRIGATION (CONVEYANCE) 130,000 111,605 111,605 0 0 0 0

DOMESTIC AND STOCK 19,260 18,796 19,234 -18 0 0 278

DOMESTIC AND STOCK [DOMESTIC] 271 175 271 -16 0 0 0

DOMESTIC AND STOCK [STOCK] 10,626 10,116 10,515 0 0 0 6

LOCAL WATER UTILITY 23,816 22,982 23,816 0 0 0 445

MISCELLANEOUS TRANSFER 307 0 0 0 0 0 0

MURRUMBIDGEE IRRIGATION (CONVEYANCE) 243,000 147,187 150,247 1 0 0 1,360

REGULATED RIVER (CONVEYANCE) 2,968 0 0 0 0 0 0

REGULATED RIVER (GENERAL SECURITY) 1,891,995 141,706 0 151,669 32,944 40,806 1,655

REGULATED RIVER (HIGH SECURITY) 360,298 331,067 342,284 -145 855 11,056 786

REGULATED RIVER (HIGH SECURITY) [ABORIGINAL CULTURAL] 2,150 2,150 2,150 0 0 0 0

REGULATED RIVER (HIGH SECURITY) [ENVIRONMENTAL] 3,982 3,401 3,401 0 0 0 0

REGULATED RIVER (HIGH SECURITY) [RESEARCH] 300 300 300 0 0 0 0

REGULATED RIVER (HIGH SECURITY) [TOWN WATER SUPPLY] 19,769 19,769 19,769 0 0 0 0

SUPPLEMENTARY WATER 198,780 197,969 197,969 0 761 761 0

SUPPLEMENTARY WATER (LOWBIDGEE) 747,000 747,000 747,000 0 0 0 0

Grand Total 3,654,522 1,754,223 1,628,562 151,669 34,559 52,623 4,529

Storage Forecast

20

Considers extreme dry scenario with conservative budgets for system losses and reduced Required Annual Release from Snowy Hydro (i.e. increased Dry Inflow Sequence Volume).

0

200

400

600

800

1,000

1,200

Jul-17

Au

g-1

7

Oc

t-1

7

De

c-1

7

Feb

-18

Ap

r-1

8

Jun

-18

Au

g-1

8

Oc

t-1

8

De

c-1

8

Feb

-19

Ap

r-1

9

Jun

-19

Au

g-1

9

Oc

t-1

9

De

c-1

9

Feb

-20

Ap

r-2

0

Jun

-20

Au

g-2

0

Oc

t-2

0

De

c-2

0

Feb

-21

Ap

r-2

1

Jun

-21

En

d o

f M

on

th S

tora

ge

(G

L)

Burrinjuck Dam forecast storage capacity

updated mid - July 2019

Wet scenario (20%) Average scenario (50%) Dry scenario (80%) Extreme dry scenario (99%) Actual

* Including Snowy releases

Storage Forecast

21

Considers extreme dry scenario with conservative budgets for system losses and reduced Required Annual Release from Snowy Hydro (i.e. increased Dry Inflow Sequence Volume).

0

200

400

600

800

1,000

1,200

1,400

1,600

1,800

Jul-17

Au

g-1

7

Oc

t-1

7

De

c-1

7

Feb

-18

Ap

r-1

8

Jun

-18

Au

g-1

8

Oc

t-1

8

De

c-1

8

Feb

-19

Ap

r-1

9

Jun

-19

Au

g-1

9

Oc

t-1

9

De

c-1

9

Feb

-20

Ap

r-2

0

Jun

-20

Au

g-2

0

Oc

t-2

0

De

c-2

0

Feb

-21

Ap

r-2

1

Jun

-21

En

d o

f M

on

th S

tora

ge

(G

L)

Blowering Dam forecast storage capacity

updated mid - July 2019

Wet scenario (20%) Average scenario (50%) Dry scenario (80%) Extreme dry scenario (99%) Actual

* Including Snowy releases

Drought Operations Plan▪ Maintain airspace in all re-regulation storages (subject to level of service) to capture any

tributary inflows and or irrigation rejection.

▪ Berembed Weir

▪ Gogeldrie Weir

▪ Hay Weir operational supply level

▪ Maude Weir

▪ Redbank Weir

▪ Potential block-releases in identified river sections to supply customers in effluent creeks and anabranches (e.g., Uri Creek, Beavers - Old man creek, etc.)

▪ Maximise use of Irrigation escapes in the Yanco system to meet water orders / system demands

▪ Consider a trial of reduced lead-order times for works in strategic areas – based on system infrastructure – limits on extraction rate and total volume

▪ Consider the risk profile of surplus against supply shortfall.

▪ Develop operational procedures to share smaller supplementary events in an equitable manner.

▪ Intensify monitoring of water order – usage behaviour to minimise operational surplus

▪ Ensure all town water supply extraction sites are secure to access low flows

22

Policy Framework

Drought Management Plans

DoI Water development of the Temporary Water Restriction protocol

Valley Based Incident Response Guides

WaterNSW responsible for the preparation of drought management plans

for each valley

Including the development of management of criteria for assessing the

criticality of priority water use

Drought management plans are prepared in consultation with local

stakeholders

Drought Plans are approved by DoI Water with input from the CWAP

Temporary Water Restriction Process

Critical Dates

24

SN Drought Impacts Probable Impact Timeframe

1 Nil access to HS that are not for human usage Jul-19

2 Nil access to GS and restricted to usages other than

critical human needs and essential supplies Jul-19

3 Limited water supply to Mungindi Jul-19

4 Limited replenishment flow to Boomi River Sept/Oct-19

5 Limited access to S&D usage Jul-19

6 Algal blooms and increased chance of fish kills due to low

storage levels Sept/Oct-19

7 Potential restricted delivery for some of the towns (e.g.

Goondiwindi, Mungindi) Jul-19

8 Water quality issues at low storage levels May/Jun-20

Rainfall Event Forecasting and Monitoring

• WaterNSW monitors rainfall and inflows

• Based on recorded inflows WaterNSW operates the system to the

current drought management plan

• If current drought restriction are to be changed WaterNSW to

prepare change plan and justification for DoI Water approval

• DoI W and WaterNSW communicate changes


Drought Monthly Valley Assessment

• WaterNSW monitors and reports on the drought situation around the state

including the drought priority assessments

• WaterNSW recommends drought management strategy changes based

on reported conditions and reasons for changes (public interest test)

• DPIE Water assess drought conditions and actions and approves course

on action (regulatory alignment)

• DPIE and WaterNSW update drought situation and water restriction orders

• DPIE Water and WaterNSW communicate changes


Mapping of Critical

Water Supplies


Criticality of Water Supply Assessment

• WaterNSW plan to run through with local stakeholder the process to managing flow event and justifying the need for Temporary Water Restrictions

• Develop criteria for the assessment of critical water supply status

• Produce a map of the State to show what areas of have been identified as critical which will be undated as situation changes

• Examples shown in follow slides

Walgett Water SupplyXx Volume in storage

Pian Creek S&D Supply120 Days of cease to Flow

Namoi River D/s Wee WeaS&D Supply

120 Days of cease to Flow

Namoi River U/S Wee WeaS&D/HS Supply

90 Days of cease to Flow

Criticality of Water Supply Criteria - Namoi

1. Identification of critical Environmental Sites - prepared for the Macquarie

2. Development of Monitoring Program – under development

3. Development of Response Strategy – to be developed

Critical Environmental Sites

31

Keep Informed

WaterNSW


Visit the website at:

waternsw.com.au/drought

For information on the Macquarie Valley including water availability reports and drought reports go to:

waternsw.com.au/supply/drought-information/regional-nsw/

Call us on: 1300 662 077

Subscribe at: waternsw.com.au/subscribe

For weekly customer drought updates and more information

32

To keep updated

https://www.waternsw.com.au/supply/drought-information/regional-nsw/macquarie-valley

33

Water Insights Portal

34

Thank you for joining us today

WaterNSWWater NSW © 2019 – Do not copy, cite or distribute without permission of Water NSW

WaterNSW Operations update...2019/08/01 · Dam Storages 4 0% 10% 20% 30% 40% 50% 60% 70% 80% 90%...

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Transcript of WaterNSW Operations update...2019/08/01 · Dam Storages 4 0% 10% 20% 30% 40% 50% 60% 70% 80% 90%...