DWR NWRI So Cal Water Committee

Transcription

1 GROUNDWATER MANAGEMENT and Resiliency in the Los Angeles Area Gregory R. Reed, PE Waterworks Engineer Water Rights and Groundwater Management LADWP Water Resources October 19, 2016 DWR NWRI So Cal Water Committee

2 Today s Topics LA Groundwater Basin Overview Drought Response & Resiliency SGMA Compliance 2

3 Key Questions What do we need to know about Groundwater Basins in LA? How have these basins performed during the recent drought? Can we improve basin resiliency? How s it going with SGMA? 3

4 LA Groundwater Basins Upper Los Angeles River Area San Fernando Basin Sylmar Basin Verdugo Basin Eagle Rock Basin 90,680 AFY 7,140 AFY 3,570 AFY ~500 AFY Los Angeles Coastal Plain Central Basin 217,367 AFY West Coast Basin 64,468 AFY Santa Monica Basin ~12,500 AFY Hollywood Basin ~3,000 AFY 4

5 Upper Los Angeles River Area San Fernando Basin Sylmar Basin Verdugo Basin ULARA Eagle Rock Basin 5

6 Central & West Coast Basins West Coast Basin Central Basin 6

7 Drought Response How have the LA Basins performed during the recent drought? 7

8 ULARA Groundwater Contours 8

9 ULARA - Recharge & Production Rainfall, inch AVG, in Recharge Pumping Storage x1,000 AF

10 ULARA Change In Storage 10

11 ULARA Key Well in east SF Basin 11

12 Central & West Coast Basin Contours 12

13 Central Basin - Recharge & Production Rainfall, inch AVG, 14 in Recharge Pumping Storage x1,000 AF

14 Central Basin Change in Storage Storage x1,000 AF '

15 Key Wells in Central and West Coast Basin 15

16 Regional Water Supply CENTRAL/WEST ULARA Supplies Include: Imported + Local Groundwater + Recycled Water 16

17 Resiliency Can we improve resiliency and drought proof our local basins? 17

18 Diversifying Regional Water Supplies Imported (60%) RW (7%) GW (33%) Today s Water Demand ~900,000 AFY Mayor Garcetti Exec Dir No. 5: Reduce Purchased Water Imports by 50% by 2024 Locally Sourced Supply by 50% by 2035 Today s Pumping: ~300,000 AFY Groundwater Potential: TBD Imported RW + New Conservation GW 18

19 Conservation - Cornerstone for Resiliency 19

20 Conservation - Cornerstone for Resiliency 20

21 Water Conservation Since 1977 Local City Ordinances Commercial Programs CONSERVE Residential Programs Public Outreach & Education 1.75 LADWP Partnerships

22 Conservation as a Local Resource 22

23 Resiliency in ULARA Recharge Replenishment Remediation 23

24 Stormwater Recharge Programs Dam Improvements Sub-Regional Centralized CAPTURE Distributed Spreading Basins Green Streets Cisterns 24

25 Groundwater Replenishment Treatment Conveyance Replenishment Extraction 25

26 Groundwater Contamination USEPA

27 Groundwater Remediation Burbank Operable Unit Glendale Operable Unit No. Hollywd OU Pollock Wells GAC Tujunga Wells Temp GAC 27

28 Resiliency in Central and West Coast Basins Projects to eliminate the use of imported water for replenishment of Central and West Coast Basins 28

29 L.A. County Replenishment Spreading Facilities (infiltration) Basins West Coast Barrier Dominguez Gap Barrier Alamitos Barrier 29

30 L.A. County Replenishment Facilities Rio Hondo spreading basins San Gabriel River spreading basins 30

31 Recycled Water Purification Facility 31

32 L.A.. County Seawater Barrier Wells W.I.N. Strategy Eliminate use of imported supply for West Coast, Dominguez Gap, and Alamitos Seawater Barriers. Use 100% recycled water instead. 32

33 Purified Recycled Water Systems Advanced Treatment Permits now allow 100% use of recycled water at all three seawater barrier systems. Provides resiliency for CB/WCB Edward C. Little Water Recyc Facil Terminal Island Water Recl Plant Leo Vander Lans Water Trmt Facil 33

34 Purified Recycled Water Systems Joint Pollution Control Plant 34

35 Saline Plume Remediation Desalter Facilities 600,000 AF saline plume located interior to the West Basin Barrier System. C. Marvin Brewer and Robert W. Goldsworthy Desalter facilities remove chlorides and TDS from the impaired water source. 35

36 Sustainable Groundwater Mgmt Act How s it going with SGMA? 36

37 Sustainable Groundwater Mgmt Act Hollywood Basin Santa Monica Basin N. Central Basin 37

38 Sustainable Groundwater Mgmt Act SGMA Goal: Address Undesirable Results Critical Overdraft Declining Water Levels Land Subsidence Seawater Intrusion Surface Water Depletion Groundwater Quality Degradation 38

39 Sustainable Groundwater Mgmt Act SGMA Compliance Option 1 Form Groundwater Sustainability Agency (GSA) Prepare Groundwater Sustainability Plan (GSP) SGMA Compliance Option 2 File Alternative Analysis for entire basin Show 10 yr History of Sustainability Reevaluate Conditions every 5 yrs SGMA Compliance Option 3 County as Default GSA 39

40 Sustainable Groundwater Mgmt Act Hollywood Basin Overlying Agencies Groundwater Production Basin Prioritization is LOW Low Priority Basins are Exempt from SGMA 40

41 Sustainable Groundwater Mgmt Act Santa Monica Basin Overlying Agencies Groundwater Production MTBE Remediation Pgm Basin Prioritization is MEDIUM Agencies will begin discussions to form a GSA and prepare a GSP 41

42 Sustainable Groundwater Mgmt Act North Central Basin (Fringe Area) Overlying Agencies Groundwater Production Basin Prioritization is HIGH 10 Yrs of historic data show basin is sustainable Agencies are working towards filing an SGMA Alternative 42

43 Final Thoughts Resiliency is dependent upon developing alternative sources of water supply Recent drought has placed an urgency for regional solutions Collaboration is essential for our success 43

44 Thank You! Gregory R. Reed, PE Waterworks Engineer Water Rights and Groundwater Management LADWP Water Resources 44