Water Supply Board Briefing. Water Operations Department March 22, 2016

Transcription

1 Water Supply Board Briefing Water Operations Department March 22, 2016

2 Water Supply Briefing California Water Supply District Water Supply Water Supply Projections Water Supply Schedule 2

3 California Water Supply

4 California Water Supply Snow Depth March 2015 March

5 California Water Supply Snow Water Equivalent March 2015 March

6 California Water Supply Automated Survey - Snow Water Equivalents Automated Snow Measurements Snow Water Equivalents Year % of Normal on March % % Snow station surveys conducted around March 1, 2016 Manual readings confirm preliminary automated measurements 6

7 California Water Supply Shasta Reservoir March 21, 2016 March 1, 2016 December 1, 2015 CA Department of Water Resources 7

8 California Water Supply Oroville Reservoir March 21, 2016 March 1, 2016 December 1, 2015 CA Department of Water Resources 8

9 California Water Supply Reservoir Storage March 21 March 21 Average Storage March 21, 2016 Storage March 7, 2016 Storage 9

10 California Water Supply Folsom Flood Release Folsom Lake releases on March 8, 2016 CA Department of Water Resources 10

11 California Water Supply DWR State Water Project (SWP) State Water Project Supplies 29 water agencies (25 million Californians and 750,000 acres of farmland) Delivers water to two-thirds of California s population Oroville Dam 11

12 California Water Supply DWR State Water Project (SWP) Allocation Year SWP Allocation % % % % %* 45% - Mar 17 30% - Feb 24 15% - Jan 26 *As of March 17,

13 California Water Supply USBR Central Valley Project (CVP) Central Valley Project Supplies about a million California homes and 3 million acres of agricultural land Dedicates water to support fish and wildlife habitat EBMUD CVP Contract max annual drought supply = 133 TAF Shasta Dam 13

14 California Water Supply USBR Central Valley Project (CVP) Allocation Year CVP Allocation % % % %* 2016? * Health and Safety needs or at least 25% of their historical use, whichever is greater Initial allocation expected this week 14

15 Current Water Supply 15

16 Current Water Supply Mokelumne Precipitation Rainfall Year 2016 Average

17 Current Water Supply East Bay Precipitation Rainfall Year 2016 Average

18 Current Water Supply Precipitation & Snow Add current photos East Bay As of 3/21/2016 Cumulative Precipitation % of Average East Bay Watershed % Mokelumne Basin 4-Station Average % Caples Lake Snow Depth 65 92% Caples Lake Snow Water Content % 18

19 Snow Depth (in) Current Water Supply Caples Lake Snow Depth Historical Average O N D J F M A M J Date 19

20 Current Water Supply Pardee Reservoir March 21, 2016 March 1, 2016 December 1,

21 Current Water Supply Camanche Reservoir March 21, 2016 March 1, 2016 December 1,

22 Current Water Supply Mokelumne Operations Through March 21 st : Precipitation Average is 4.88 Peak Runoff at 6,800 cfs on Mar 3 Pardee Inflow peaked at 4,200 cfs on Mar 14 Pardee level has increased ~12 feet Pardee Power Generation $428,000 dollars in revenue 14,440 MWh generated

23 Current Water Supply Reservoir Storage As of 3/21/16 Current Storage Percent of Average Percent of Capacity Pardee 194,920 AF 108% 98% Camanche 163,730 AF 56% 39% East Bay 138,240 AF 99% 91% Total System 496,890 AF 81% 65% 23

24 2015 Drought Operations Service Area in Winter 2015 March 2016 Sacramento River Water throughout Service Area Sobrante WTP Upper San Leandro WTP Walnut Creek WTP San Pablo WTP Orinda WTP Lafayette WTP 24

25 2016 Current Operations Configuration in Typical Non-Drought Winter 25

26 gross water production (mgd) Current Water Supply Gross Water Production Year Average of FY FY 2016 FY 2013 FY 2016 Operational Estimate (149 MGD) Jul 1-Aug 1-Sep 1-Oct 1-Nov 1-Dec 1-Jan 1-Feb 1-Mar 1-Apr 1-May 1-Jun

27 Current Water Supply Water Savings Savings Rate (2013 Baseline) March 22, 2015 March 21, 2016 June 1, 2015 March 21, % 24% 27

28 Water Supply Projections

29 Water Supply Projections (Runoff Projections as of March 22, 2016) Forecast Annual Runoff Total System Storage (on Sept 30, 2016) No Rain To-Come 610 TAF 540 TAF 95% Exceedance (9.5 of 10 years are wetter) 90% Exceedance (9 of 10 years are wetter) 50% Exceedance (5 of 10 years are wetter) 10% Exceedance (1 of 10 years is wetter) 670 TAF 600 TAF 690 TAF 610 TAF 760 TAF 630 TAF 890 TAF 630 TAF Average Year 745 TAF 630 TAF 29

30 Water Supply Projections Mokelumne Precipitation Rainfall Year 2016 Wettest of Record 87.3 (RY83) RY 2016 To-Date % Exceedance Median 90% Exceedance Average 48.3 Driest of Record 23.0 (RY77) 30

31 Water Supply Projections Precipitation Comparison 50 Precipitation (in) - Recent Years MED 52.1 DRY Historical Avg Remainder Through Mar Through Mar

32 Water Supply Projections End of September Storage MEDIAN 630 TAF DRY 610 TAF 30 TAF Encroachment 25 TAF SS 15 TAF Conservation 40 TAF SS 45 TAF Conservation 32

33 Water Supply Projections Mokelumne Precipitation Late March Accuweather.com at Pioneer, CA Forecast 7-day precipitation: 0.1 inches Average 7-day precipitation: 1.4 inches 33

34 Water Supply Projections 14-Day NOAA Precipitation Probability Estimate 33 to 40% Chance of Below-Normal Precipitation In the Mokelumne Watershed 34

35 Water Supply Projections NOAA Precipitation Probability Estimate through June 33 to 40% Increased Chance of Above- Normal Precipitation In the Mokelumne Watershed 35

36 Water Year 2016 As of March 21, 2016 Mokelumne River basin runoff is 284 TAF Projected end of water year storage is TAF (90% - 10% exceedance) Mokelumne River watershed season to date precipitation is 114% of average East Bay watershed season to date precipitation is 107% of average Precipitation accumulation season 80% complete (20% remaining) 36

37 Water Year 2016 Water Supply Schedule Date February 2 February 23 March 1 Late March March to April April 1 April 26 Activity DWR February Snow Survey Drought Financial Impacts DWR March Snow Survey USBR Initial Allocation Water Supply Updates Continue public outreach DWR April Snow Survey Water Supply Availability and Deficiency Report Consider change in Drought Stage 37

38 Spring Showers