General Groundwater Concepts for GSP Development in the ...santarosaplaingroundwater.org/wp-content/uploads/5-7-18-Groundw… · General Groundwater Concepts for GSP Development in

sonomacountygroundwater.org

General Groundwater Concepts for GSP Development in the

Santa Rosa Plain

Santa Rosa Plain Groundwater Sustainability AgencyAdvisory Committee Meeting

May 7, 2018


Presentation Overview

1. Aquifer Properties and Groundwater Movement2. Groundwater Levels and Surface Water-Groundwater

Interaction3. Groundwater Quality4. Groundwater Budgets and Models5. Questions & Discussion


Hydrologic Cycle

US Geological Survey Circular 1139


Aquifer Materials: Examples of Porosity

• Specific Yield = Amount of water that drains from an unconfined aquifer

• 20% Specific Yield example:• 1 cubic foot of aquifer material

yields 0.2 cubic feet of water• 2 inches of recharge can raise

groundwater levels nearly one foot


Aquifer Materials: Hydraulic Conductivity

Darcy’s Law of Groundwater Flow (Q)• Hydraulic conductivity (K)• Hydraulic gradient (i)• Cross-sectional area of flow (A)

Q = KiA

Common methods for estimating Hydraulic Conductivity:• Aquifer Testing (pumping a well and measuring

responses in nearby wells)• Aquifer material type (eg, infer from driller’s or

geologist’s descriptions from well logs)• Numeric Modeling• Geophysical Surveys


Most Data on Aquifer Properties from Well Logs


Santa Rosa Plain Geology and Primary Hydrogeologic Units

Alluvium/Glen Ellen PetalumaWilson Grove Sonoma Volcanics

Santa Rosa Plain Groundwater Subbasin


Santa Rosa Plain 3-D Lithology Model


Groundwater MovementBetween Recharge and Discharge

U.S. Geological Survey Circular 1139


Unconfined and Confined Aquifers

Harter, UC Division of Ag and Natural Resources, Publication 8083

Heath, USGS Water Supply Paper 2220


Groundwater Levels ChangeSeasonally and Climatically

Well Hydrograph, Groundwater and the Rural Homeowner, U.S. Geological Survey


Groundwater Levels ChangeWhen Discharge Exceeds Recharge

Well Hydrograph, Water Well Database, California Department of Water Resources

-40

-30

-20

-10

0

10

20

1948 1958 1968 1978 1988 1998

Grou

ndwa

ter E

levati

on

Chart1

17876

18241

18580

18962

19234

19278

19335

19397

19450

19499

19549

19595

19662

19826

20018

20169

20383

20543

20752

20890

21101

21268

21467

21622

21823

21976

22382

22397

22426

22448

22480

22521

22552

22560

22579

22613

22641

22670

22700

22718

22732

22759

22794

22822

22854

22885

22914

22945

22977

23004

23039

23063

23098

23124

23158

23188

23218

23250

23279

23314

23337

23368

23404

23431

23460

23494

23523

23552

23582

23614

23644

23673

23705

23735

23764

23792

23826

23855

23887

23917

23946

23978

24009

24041

24069

24099

24132

24162

24195

24223

24253

24280

24313

24344

24377

24405

24440

24469

24498

24527

24559

24588

24617

24650

24679

24713

24741

24770

24804

24833

24863

24895

24922

24957

24985

25015

25045

25080

25107

25140

25169

25196

25231

25259

25289

25316

25352

25379

25413

25443

25476

25506

25533

25567

25597

25625

25658

25686

25717

25749

25780

25808

25840

25870

25896

25931

25959

25989

26023

26052

26080

26114

26144

26176

26206

26234

26254

26267

26296

26325

26358

26388

26417

26449

26480

26507

26541

26570

26603

26632

26661

26695

26723

26754

26781

26815

26844

26876

26907

26935

26968

26997

27025

27060

27088

27117

27145

27179

27207

27240

27271

27299

27333

27360

27390

27423

27453

27480

27514

27543

27569

27605

27634

27667

27696

27723

27758

27789

27816

27850

27879

27907

27947

27971

28002

28033

28062

28094

28124

28153

28184

28209

28242

28272

28304

28335

28367

28397

28425

28458

28481

28515

28544

28583

28607

28642

28671

28698

28733

28761

28793

28821

28845

28941

29138

29304

29502

29656

29859

30032

30245

30396

30607

30756

30960

31111

31336

31484

31715

31855

32070

32218

32427

32577

32794

32941

33168

33316

33709

33990

34074

34291

34457

34647

34837

35011

35185

35402

35542

35758

36102

36250

36458

36613

36861

37032

37222

37356

37581

37718

37922

38064

Groundwater Elevationi

11.7

9.8

8.5

8

10

9.1

9.2

11.2

11.8

11.7

9

8

6.7

10.2

5.8

7.9

3.2

6.6

2.5

4.7

1.6

4.4

2.2

4.6

1.5

3

-2.6

-2.5

-4.7

-4.2

-6.2

-6.4

-6.9

-6.9

-6.9

-7.8

-6.3

-5.8

-5.1

-5

-4.7

-5.3

-5.6

-6.6

-7.3

-8.4

-8.9

-8.2

-7.5

-7.2

-7.1

-5.8

-5.1

-4.4

-3.8

-4.9

-6

-7.1

-7.4

-6.9

-6.5

-6.1

-5.6

-5.3

-5.1

-5

-6.4

-4.8

-8.6

-9.7

-10.3

-10.5

-9.5

-9

-8.2

-7.4

-7.3

-5.7

-6.8

-7.6

-8.6

-9

-9.5

-9.7

-9.1

-8.3

-7.9

-7.3

-6.1

-7.5

-8.4

-9.3

-10.6

-11.5

-12

-12.1

-11.3

-10.6

-9.9

-9.1

-8.1

-7.3

-7.6

-7.8

-8.9

-10.2

-10.6

-10.5

-10.1

-10

-9

-8.5

-8.1

-9

-9.8

-11.3

-12.5

-14.9

-13.9

-13.8

-13.2

-12.4

-11.8

-10.9

-10

-9.3

-9.9

-10.6

-12

-13.2

-13.8

-13.2

-12.8

-11.8

-11.5

-10.9

-10.5

-10.6

-11.5

-12.8

-14.2

-15.3

-16.2

-15.9

-15.3

-14.7

-13.9

-13.2

-12.2

-11.8

-12.2

-13.5

-15

-17

-16.5

-16

-15.7

-15.1

-14.7

-14.1

-14

-14.3

-15.4

-16.8

-17.9

-19.2

-19.2

-18.5

-18

-17.4

-16.5

-15.7

-14.5

-14.2

-15.2

-16.5

-17.7

-18.8

-18.8

-18.1

-17.3

-16.6

-15.3

-14.1

-13

-11.6

-12

-13.4

-14.7

-15.8

-16.4

-16.3

-15.7

-15.1

-14.6

-14

-13.4

-12.8

-14.1

-15.2

-16.8

-17.6

-18.2

-17.7

-17.3

-16.5

-16.2

-15.9

-16.1

-16.5

-17.8

-19.7

-20.6

-21.6

-21.3

-20.4

-20.4

-20.4

-19.8

-19.4

-19

-19.2

-19.2

-20.4

-21.5

-22.1

-22.1

-21.9

-21.5

-20.9

-20.2

-19.5

-18.6

-17.8

-18.5

-19.4

-20.4

-21.6

-21.7

-21.7

-21.3

-20.9

-18.6

-23.1

-19

-22.1

-20.1

-24.8

-21.7

-23.1

-19.8

-18.2

-13.4

-20.2

-18.6

-24.6

-23.6

-25.8

-25.2

-29.3

-27.5

-29.8

-29.2

-31.9

-30.9

-33.3

-33

-33.8

-33.6

-35.4

-39

-38

-30.2

-32.3

-28.1

-30.9

-29.7

-33.1

-29.8

-27.3

-30.8

-31.2

-29.7

-31.5

-32.8

-31.3

-29.2

-34.5

-28.3

Rpt_Hist_Data5_Excel_gw

State Well NumberMeas.DateWSER.P.Elev.G.S. Elev.RPWSWSEGSWSQMCNMCAgency

09N05E21M001M12/9/194811.734.63422.911.722.35050

09N05E21M001M12/9/19499.834.63424.89.824.25050

09N05E21M001M11/13/19508.534.63426.18.525.55050

09N05E21M001M11/30/1951834.63426.68265050

09N05E21M001M8/28/19521034.63424.610245050

09N05E21M001M10/11/19529.134.63425.59.124.95050

09N05E21M001M12/7/19529.234.63425.49.224.85050

09N05E21M001M2/7/195311.234.63423.411.222.85050

09N05E21M001M4/1/195311.834.63422.811.822.25050

09N05E21M001M5/20/195311.734.63422.911.722.35050

09N05E21M001M7/9/1953934.63425.69255050

09N05E21M001M8/24/1953834.63426.68265050

09N05E21M001M10/30/19536.734.63427.96.727.35050

09N05E21M001M4/12/195410.234.63424.410.223.85050

09N05E21M001M10/21/19545.834.63428.85.828.25050

09N05E21M001M3/21/19557.934.63426.77.926.15050

09N05E21M001M10/21/19553.234.63431.43.230.85050

09N05E21M001M3/29/19566.634.634286.627.45050

09N05E21M001M10/24/19562.534.63432.12.531.55050

09N05E21M001M3/11/19574.734.63429.94.729.35050

09N05E21M001M10/8/19571.634.634331.632.45050

09N05E21M001M3/24/19584.434.63430.24.429.65050

09N05E21M001M10/9/19582.234.63432.42.231.85050

09N05E21M001M3/13/19594.634.634304.629.45050

09N05E21M001M9/30/19591.534.63433.11.532.55050

09N05E21M001M3/1/1960334.63431.63315050

09N05E21M001M4/11/1961-2.634.63437.2-2.636.65050

09N05E21M001M4/26/1961-2.534.63437.1-2.536.55050

09N05E21M001M5/25/1961-4.734.63439.3-4.738.75050

09N05E21M001M6/16/1961-4.234.63438.8-4.238.25050

09N05E21M001M7/18/1961-6.234.63440.8-6.240.25050

09N05E21M001M8/28/1961-6.434.63441-6.440.45050

09N05E21M001M9/28/1961-6.934.63441.5-6.940.95050

09N05E21M001M10/6/1961-6.934.63441.5-6.940.95050

09N05E21M001M10/25/1961-6.934.63441.5-6.940.95050

09N05E21M001M11/28/1961-7.834.63442.4-7.841.85050

09N05E21M001M12/26/1961-6.334.63440.9-6.340.35050

09N05E21M001M1/24/1962-5.834.63440.4-5.839.85050

09N05E21M001M2/23/1962-5.134.63439.7-5.139.15050

09N05E21M001M3/13/1962-534.63439.6-5395050

09N05E21M001M3/27/1962-4.734.63439.3-4.738.75050

09N05E21M001M4/23/1962-5.334.63439.9-5.339.35050

09N05E21M001M5/28/1962-5.634.63440.2-5.639.65050

09N05E21M001M6/25/1962-6.634.63441.2-6.640.65050

09N05E21M001M7/27/1962-7.334.63441.9-7.341.35050

09N05E21M001M8/27/1962-8.434.63443-8.442.45050

09N05E21M001M9/25/1962-8.934.63443.5-8.942.95050

09N05E21M001M10/26/1962-8.234.63442.8-8.242.25050

09N05E21M001M11/27/1962-7.534.63442.1-7.541.55050

09N05E21M001M12/24/1962-7.234.63441.8-7.241.25050

09N05E21M001M1/28/1963-7.134.63441.7-7.141.15050

09N05E21M001M2/21/1963-5.834.63440.4-5.839.85050

09N05E21M001M3/28/1963-5.134.63439.7-5.139.15050

09N05E21M001M4/23/1963-4.434.63439-4.438.45050

09N05E21M001M5/27/1963-3.834.63438.4-3.837.85050

09N05E21M001M6/26/1963-4.934.63439.5-4.938.95050

09N05E21M001M7/26/1963-634.63440.6-6405050

09N05E21M001M8/27/1963-7.134.63441.7-7.141.15050

09N05E21M001M9/25/1963-7.434.63442-7.441.45050

09N05E21M001M10/30/1963-6.934.63441.5-6.940.95050

09N05E21M001M11/22/1963-6.534.63441.1-6.540.55050

09N05E21M001M12/23/1963-6.134.63440.7-6.140.15050

09N05E21M001M1/28/1964-5.634.63440.2-5.639.65050

09N05E21M001M2/24/1964-5.334.63439.9-5.339.35050

09N05E21M001M3/24/1964-5.134.63439.7-5.139.15050

09N05E21M001M4/27/1964-534.63439.6-5395050

09N05E21M001M5/26/1964-6.434.63441-6.440.45050

09N05E21M001M6/24/1964-4.834.63439.4-4.838.85050

09N05E21M001M7/24/1964-8.634.63443.2-8.642.615050

09N05E21M001M8/25/1964-9.734.63444.3-9.743.75050

09N05E21M001M9/24/1964-10.334.63444.9-10.344.35050

09N05E21M001M10/23/1964-10.534.63445.1-10.544.55050

09N05E21M001M11/24/1964-9.534.63444.1-9.543.55050

09N05E21M001M12/24/1964-934.63443.6-9435050

09N05E21M001M1/22/1965-8.234.63442.8-8.242.25050

09N05E21M001M2/19/1965-7.434.63442-7.441.45050

09N05E21M001M3/25/1965-7.334.63441.9-7.341.35050

09N05E21M001M4/23/1965-5.734.63440.3-5.739.75050

09N05E21M001M5/25/1965-6.834.63441.4-6.840.85050

09N05E21M001M6/24/1965-7.634.63442.2-7.641.65050

09N05E21M001M7/23/1965-8.634.63443.2-8.642.65050

09N05E21M001M8/24/1965-934.63443.6-9435050

09N05E21M001M9/24/1965-9.534.63444.1-9.543.55050

09N05E21M001M10/26/1965-9.734.63444.3-9.743.75050

09N05E21M001M11/23/1965-9.134.63443.7-9.143.15050

09N05E21M001M12/23/1965-8.334.63442.9-8.342.35050

09N05E21M001M1/25/1966-7.934.63442.5-7.941.95050

09N05E21M001M2/24/1966-7.334.63441.9-7.341.35050

09N05E21M001M3/29/1966-6.134.63440.7-6.140.15050

09N05E21M001M4/26/1966-7.534.63442.1-7.541.55050

09N05E21M001M5/26/1966-8.434.63443-8.442.45050

09N05E21M001M6/22/1966-9.334.63443.9-9.343.35050

09N05E21M001M7/25/1966-10.634.63445.2-10.644.65050

09N05E21M001M8/25/1966-11.534.63446.1-11.545.55050

09N05E21M001M9/27/1966-1234.63446.6-12465050

09N05E21M001M10/25/1966-12.134.63446.7-12.146.15050

09N05E21M001M11/29/1966-11.334.63445.9-11.345.35050

09N05E21M001M12/28/1966-10.634.63445.2-10.644.65050

09N05E21M001M1/26/1967-9.934.63444.5-9.943.95050

09N05E21M001M2/24/1967-9.134.63443.7-9.143.15050

09N05E21M001M3/28/1967-8.134.63442.7-8.142.15050

09N05E21M001M4/26/1967-7.334.63441.9-7.341.35050

09N05E21M001M5/25/1967-7.634.63442.2-7.641.65050

09N05E21M001M6/27/1967-7.834.63442.4-7.841.85050

09N05E21M001M7/26/1967-8.934.63443.5-8.942.95050

09N05E21M001M8/29/1967-10.234.63444.8-10.244.25050

09N05E21M001M9/26/1967-10.634.63445.2-10.644.65050

09N05E21M001M10/25/1967-10.534.63445.1-10.544.55050

09N05E21M001M11/28/1967-10.134.63444.7-10.144.15050

09N05E21M001M12/27/1967-1034.63444.6-10445050

09N05E21M001M1/26/1968-934.63443.6-9435050

09N05E21M001M2/27/1968-8.534.63443.1-8.542.55050

09N05E21M001M3/25/1968-8.134.63442.7-8.142.145050

09N05E21M001M4/29/1968-934.63443.6-9435050

09N05E21M001M5/27/1968-9.834.63444.4-9.843.845050

09N05E21M001M6/26/1968-11.334.63445.9-11.345.35050

09N05E21M001M7/26/1968-12.534.63447.1-12.546.55050

09N05E21M001M8/30/1968-14.934.63449.5-14.948.95050

09N05E21M001M9/26/1968-13.934.63448.5-13.947.95050

09N05E21M001M10/29/1968-13.834.63448.4-13.847.85050

09N05E21M001M11/27/1968-13.234.63447.8-13.247.25050

09N05E21M001M12/24/1968-12.434.63447-12.446.45050

09N05E21M001M1/28/1969-11.834.63446.4-11.845.85050

09N05E21M001M2/25/1969-10.934.63445.5-10.944.95050

09N05E21M001M3/27/1969-1034.63444.6-10445050

09N05E21M001M4/23/1969-9.334.63443.9-9.343.35050

09N05E21M001M5/29/1969-9.934.63444.5-9.943.95050

09N05E21M001M6/25/1969-10.634.63445.2-10.644.65050

09N05E21M001M7/29/1969-1234.63446.6-12465050

09N05E21M001M8/28/1969-13.234.63447.8-13.247.25050

09N05E21M001M9/30/1969-13.834.63448.4-13.847.85050

09N05E21M001M10/30/1969-13.234.63447.8-13.247.25050

09N05E21M001M11/26/1969-12.834.63447.4-12.846.85050

09N05E21M001M12/30/1969-11.834.63446.4-11.845.85050

09N05E21M001M1/29/1970-11.534.63446.1-11.545.55050

09N05E21M001M2/26/1970-10.934.63445.5-10.944.95050

09N05E21M001M3/31/1970-10.534.63445.1-10.544.55050

09N05E21M001M4/28/1970-10.634.63445.2-10.644.65050

09N05E21M001M5/29/1970-11.534.63446.1-11.545.55050

09N05E21M001M6/30/1970-12.834.63447.4-12.846.85050

09N05E21M001M7/31/1970-14.234.63448.8-14.248.25050

09N05E21M001M8/28/1970-15.334.63449.9-15.349.35050

09N05E21M001M9/29/1970-16.234.63450.8-16.250.25050

09N05E21M001M10/29/1970-15.934.63450.5-15.949.95050

09N05E21M001M11/24/1970-15.334.63449.9-15.349.35050

09N05E21M001M12/29/1970-14.734.63449.3-14.748.75050

09N05E21M001M1/26/1971-13.934.63448.5-13.947.95050

09N05E21M001M2/25/1971-13.234.63447.8-13.247.25050

09N05E21M001M3/31/1971-12.234.63446.8-12.246.25050

09N05E21M001M4/29/1971-11.834.63446.4-11.845.85050

09N05E21M001M5/27/1971-12.234.63446.8-12.246.25050

09N05E21M001M6/30/1971-13.534.63448.1-13.547.55050

09N05E21M001M7/30/1971-1534.63449.6-15495050

09N05E21M001M8/31/1971-1734.63451.6-17515050

09N05E21M001M9/30/1971-16.534.63451.1-16.550.55050

09N05E21M001M10/28/197134.63495050

09N05E21M001M11/17/1971-1634.63450.6-16505050

09N05E21M001M11/30/1971-15.734.63450.3-15.749.75050

09N05E21M001M12/29/1971-15.134.63449.7-15.149.15050

09N05E21M001M1/27/1972-14.734.63449.3-14.748.75050

09N05E21M001M2/29/1972-14.134.63448.7-14.148.15050

09N05E21M001M3/30/1972-1434.63448.6-14485050

09N05E21M001M4/28/1972-14.334.63448.9-14.348.35050

09N05E21M001M5/30/1972-15.434.63450-15.449.45050

09N05E21M001M6/30/1972-16.834.63451.4-16.850.85050

09N05E21M001M7/27/1972-17.934.63452.5-17.951.95050

09N05E21M001M8/30/1972-19.234.63453.8-19.253.25050

09N05E21M001M9/28/1972-19.234.63453.8-19.253.25050

09N05E21M001M10/31/1972-18.534.63453.1-18.552.55050

09N05E21M001M11/29/1972-1834.63452.6-18525050

09N05E21M001M12/28/1972-17.434.63452-17.451.45050

09N05E21M001M1/31/1973-16.534.63451.1-16.550.55050

09N05E21M001M2/28/1973-15.734.63450.3-15.749.75050

09N05E21M001M3/31/1973-14.534.63449.1-14.548.55050

09N05E21M001M4/27/1973-14.234.63448.8-14.248.25050

09N05E21M001M5/31/1973-15.234.63449.8-15.249.25050

09N05E21M001M6/29/1973-16.534.63451.1-16.550.55050

09N05E21M001M7/31/1973-17.734.63452.3-17.751.75050

09N05E21M001M8/31/1973-18.834.63453.4-18.852.85050

09N05E21M001M9/28/1973-18.834.63453.4-18.852.85050

09N05E21M001M10/31/1973-18.134.63452.7-18.152.15050

09N05E21M001M11/29/1973-17.334.63451.9-17.351.35050

09N05E21M001M12/27/1973-16.634.63451.2-16.650.65050

09N05E21M001M1/31/1974-15.334.63449.9-15.349.35050

09N05E21M001M2/28/1974-14.134.63448.7-14.148.15050

09N05E21M001M3/29/1974-1334.63447.6-13475050

09N05E21M001M4/26/1974-11.634.63446.2-11.645.65050

09N05E21M001M5/30/1974-1234.63446.6-12465050

09N05E21M001M6/27/1974-13.434.63448-13.447.45050

09N05E21M001M7/30/1974-14.734.63449.3-14.748.75050

09N05E21M001M8/30/1974-15.834.63450.4-15.849.85050

09N05E21M001M9/27/1974-16.434.63451-16.450.45050

09N05E21M001M10/31/1974-16.334.63450.9-16.350.35050

09N05E21M001M11/27/1974-15.734.63450.3-15.749.75050

09N05E21M001M12/27/1974-15.134.63449.7-15.149.15050

09N05E21M001M1/29/1975-14.634.63449.2-14.648.65050

09N05E21M001M2/28/1975-1434.63448.6-14485050

09N05E21M001M3/27/1975-13.434.63448-13.447.45050

09N05E21M001M4/30/1975-12.834.63447.4-12.846.85050

09N05E21M001M5/29/1975-14.134.63448.7-14.148.15050

09N05E21M001M6/24/1975-15.234.63449.8-15.249.25050

09N05E21M001M7/30/1975-16.834.63451.4-16.850.85050

09N05E21M001M8/28/1975-17.634.63452.2-17.651.65050

09N05E21M001M9/30/1975-18.234.63452.8-18.252.25050

09N05E21M001M10/29/1975-17.734.63452.3-17.751.75050

09N05E21M001M11/25/1975-17.334.63451.9-17.351.35050

09N05E21M001M12/30/1975-16.534.63451.1-16.550.55050

09N05E21M001M1/30/1976-16.234.63450.8-16.250.25050

09N05E21M001M2/26/1976-15.934.63450.5-15.949.95050

09N05E21M001M3/31/1976-16.134.63450.7-16.150.15050

09N05E21M001M4/29/1976-16.534.63451.1-16.550.55050

09N05E21M001M5/27/1976-17.834.63452.4-17.851.85050

09N05E21M001M7/6/1976-19.734.63454.3-19.753.75050

09N05E21M001M7/30/1976-20.634.63455.2-20.654.65050

09N05E21M001M8/30/1976-21.634.63456.2-21.655.65050

09N05E21M001M9/30/1976-21.334.63455.9-21.355.35050

09N05E21M001M10/29/1976-20.434.63455-20.454.45050

09N05E21M001M11/30/1976-20.434.63455-20.454.45050

09N05E21M001M12/30/1976-20.434.63455-20.454.45050

09N05E21M001M1/28/1977-19.834.63454.4-19.853.85050

09N05E21M001M2/28/1977-19.434.63454-19.453.45050

09N05E21M001M3/25/1977-1934.63453.6-19535050

09N05E21M001M4/27/1977-19.234.63453.8-19.253.25050

09N05E21M001M5/27/1977-19.234.63453.8-19.253.25050

09N05E21M001M6/28/1977-20.434.63455-20.454.45050

09N05E21M001M7/29/1977-21.534.63456.1-21.555.55050

09N05E21M001M8/30/1977-22.134.63456.7-22.156.15050

09N05E21M001M9/29/1977-22.134.63456.7-22.156.15050

09N05E21M001M10/27/1977-21.934.63456.5-21.955.95050

09N05E21M001M11/29/1977-21.534.63456.1-21.555.55050

09N05E21M001M12/22/1977-20.934.63455.5-20.954.95050

09N05E21M001M1/25/1978-20.234.63454.8-20.254.25050

09N05E21M001M2/23/1978-19.534.63454.1-19.553.55050

09N05E21M001M4/3/1978-18.634.63453.2-18.652.65050

09N05E21M001M4/27/1978-17.834.63452.4-17.851.85050

09N05E21M001M6/1/1978-18.534.63453.1-18.552.55050

09N05E21M001M6/30/1978-19.434.63454-19.453.45050

09N05E21M001M7/27/1978-20.434.63455-20.454.45050

09N05E21M001M8/31/1978-21.634.63456.2-21.655.65050

09N05E21M001M9/28/1978-21.734.63456.3-21.755.75050

09N05E21M001M10/30/1978-21.734.63456.3-21.755.75050

09N05E21M001M11/27/1978-21.334.63455.9-21.355.35050

09N05E21M001M12/21/1978-20.934.63455.5-20.954.95050

09N05E21M001M3/27/1979-18.634.63453.2-18.652.65050

09N05E21M001M10/10/1979-23.134.63457.7-23.157.15050

09N05E21M001M3/24/1980-1934.63453.6-19535050

09N05E21M001M10/8/1980-22.134.63456.7-22.156.15050

09N05E21M001M3/11/1981-20.134.63454.7-20.154.15050

09N05E21M001M9/30/1981-24.834.63459.4-24.858.85050

09N05E21M001M3/22/1982-21.734.63456.3-21.755.75050

09N05E21M001M10/21/1982-23.134.63457.7-23.157.15050

09N05E21M001M3/21/1983-19.834.63454.4-19.853.85050

09N05E21M001M10/18/1983-18.234.63452.8-18.252.25050

09N05E21M001M3/15/1984-13.434.63448-13.447.45050

09N05E21M001M10/5/1984-20.234.63454.8-20.254.25050

09N05E21M001M3/5/1985-18.634.63453.2-18.652.65050

09N05E21M001M10/16/1985-24.634.63459.2-24.658.65050

09N05E21M001M3/13/1986-23.634.63458.2-23.657.65050

09N05E21M001M10/30/1986-25.834.63460.4-25.859.85050

09N05E21M001M3/19/1987-25.234.63459.8-25.259.25050

09N05E21M001M10/20/1987-29.334.63463.9-29.363.35050

09N05E21M001M3/16/1988-27.534.63462.1-27.561.55050

09N05E21M001M10/11/1988-29.834.63464.4-29.863.85050

09N05E21M001M3/10/1989-29.234.63463.8-29.263.25050

09N05E21M001M10/13/1989-31.934.63466.5-31.965.95050

09N05E21M001M3/9/1990-30.934.63465.5-30.964.95050

09N05E21M001M10/22/1990-33.334.63467.9-33.367.35050

09N05E21M001M3/19/1991-3334.63467.6-33675050

09N05E21M001M4/15/199234.63475050

09N05E21M001M1/21/1993-33.834.63468.4-33.867.85050

09N05E21M001M4/15/1993-33.634.63468.2-33.667.65050

09N05E21M001M11/18/1993-35.434.63470-35.469.45050

09N05E21M001M5/3/1994-3934.63473.6-39735050

09N05E21M001M11/9/1994-3834.63472.6-387235050

09N05E21M001M5/18/1995-30.234.63464.8-30.264.25050

09N05E21M001M11/8/1995-32.334.63466.9-32.366.35050

09N05E21M001M4/30/1996-28.134.63462.7-28.162.15050

09N05E21M001M12/3/1996-30.934.63465.5-30.964.95050

09N05E21M001M4/22/1997-29.734.63464.3-29.763.75050

09N05E21M001M11/24/1997-33.134.63467.7-33.167.15050

09N05E21M001M11/3/1998-29.834.63464.4-29.863.85050

09N05E21M001M3/31/1999-27.334.63461.9-27.361.35050

09N05E21M001M10/25/1999-30.834.63465.4-30.864.85050

09N05E21M001M3/28/200034.63495050

09N05E21M001M12/1/2000-31.234.63465.8-31.265.25050

09N05E21M001M5/21/2001-29.734.63464.3-29.763.75050

09N05E21M001M11/27/2001-31.534.63466.1-31.565.55050

09N05E21M001M4/10/2002-32.834.63467.4-32.866.85050

09N05E21M001M11/21/2002-31.334.63465.9-31.365.35050

09N05E21M001M4/7/2003-29.234.63463.8-29.263.25050

09N05E21M001M10/28/2003-34.534.63469.1-34.568.55050

09N05E21M001M3/18/2004-28.334.63462.9-28.362.35050

Well Coordinate Information

ProjectionDatumZoneEastingNorthingUnitsZone

UTMNAD27106353284275014metres10

LLNAD27121.445638.6152decimal degrees


Southern Santa Rosa Plain Example Hydrographs


Groundwater Levels in the Santa Rosa Plain: Changing Groundwater Flow Patterns

1951• Less groundwater pumping• Groundwater flowing mainly

east to west and discharging to Laguna de Santa Rosa

1990• Increases in groundwater

pumping through 1980s and 1990s

• Pumping depressions developed in southern and western areas

2007 – 2015• Reduction in groundwater

pumping within southern area due to increased Russian River water use, conservation and recycled water use

• Southern area pumping depression has predominantly recovered

sonomacountygroundwater.orgCourtesy The Nature Conservancy

Groundwater – Surface Water Connection

Groundwater Affec“ts Stream F” low “Gaining Stream”

High Groundwater LevelsGroundwater Maintains Stream Flow



umping Lowers Groundwater LevelsStream Loses Flow to Groundwater

“Losing Stream”Groundwater Affects Stream Flow

“Losing Stream”

Courtesy The Nature Conservancy

Pumping Lowers Groundwater LevelsStream Loses Flow to Groundwat

sonomacountygroundwater.orgPumping Lowers Groundwater LevelsStream Loses Flow to Groundwater

Groundwater Levels Below Stream Channel

“Losing Stream”


Groundwater Affects Stream Flow“Losing Stream”

Groundwater Levels Below Stream Channel

Courtesy The Nature ConservancyPumping Lowers Groundwater LevelsStream Loses Flow to Groundwater

sonomacountygroundwater.orgPumping Lowers Groundwater LevelsStream Loses Flow to Groundwater

Seepage to Groundwater Exceeds Stream FlowDry Stream Channel (Intermittently or Year-round)

Dry Stream

Groundwater – Surface Water ConnectionGroundwater Affects Stream Flow

“Dry Stream”Seepage to Groundwater Exceeds Stream Flow

Dry Stream Channel (Intermittently or Year-round)

Courtesy The Nature ConservancyPumping Lowers Groundwater LevelsStream Loses Flow to Groundwater


Groundwater Quality

Contaminant Hydrogeology, C.W. Fetter, 1992

sonomacountygSanta Rosa Plain Groundwater Subbasin roundwater.org

Over 160 Wells Sampled

• Many wells in the Santa Rosa Plain produce high quality water

• Large variability: some areas of naturally occurring iron, manganese, arsenic

• Localized impacts of nitrates and organic contaminants

• Higher salinity water with depth• Some secondary water quality

parameters, including chloride and mineral content increasing in southern Santa Rosa Plain

USGS Santa Rosa Plain Groundwater StudyGroundwater Quality Sampling


Conceptual Model Precipitation and streambed infiltration

primary source of recharge Primary discharge:

Pumping Evapotranspiration Baseflow

Dominantly flows east to west Imbalance in the amount of inflows and

outflows to the basin - could be exacerbated by future climate change.

Historical areas of groundwater-level decline largely recovered due to replacing some groundwater use with surface water and recycled water supplies and conservation.


Groundwater Budget

Inflows

Inflow From

AdjacentAquifers

Natural Land Surface

Percolation

Streambed Percolation

Outflows s

OutflowTo OtherAquifers

WellPumping

StreambedDischarge

GroundwaterEvapotranspiration

Surface Discharge


Aquifer System and Groundwater Budget Responses to Groundwater Pumping

Undeveloped Aquifer System:Natural Recharge = Natural Discharge to surface water, ET, and springs

Developed Aquifer System:Sources of water to pumping wells = Some combination of:1. increased recharge (conversion of

gaining to losing streams)2. reduction/capture of natural

discharge to surface water/ET, and 3. removal of stored groundwater

Natural Recharge ≠ Basin Sustainable Yield


Santa Rosa Plain GSFLOWSurface Water-Groundwater Model

EXAMPLE MODEL INPUTS• Precipitation• Temperature• Stream segments & conductivity• Imperviousness• Soil moisture• Geology• Hydraulic conductivity• Groundwater wells EXAMPLE MODEL USES

•Estimate hydrologic budget•Identify recharge areas•Evaluate water-resource management strategies•Evaluate climate-change impacts•Evaluate effects of changes in land-use

son

Values in Acre Feet Per Yearomacountygroundwater.org

Simulated Groundwater Budget 1976-2010Santa Rosa Plain Watershed

Inflows = 80,600Surface

Percolation41,000

SubsurfaceAquiferInflows7,200

Streambed Percolation

32,400

Outflows = 83,900Well

Pumping35,600

StreambedDischarge25,800

GroundwaterEvapotranspiration

8,500

Surface Leakage6,100

SubsurfaceAquifer

Outflows7,900


SGMA Undesirable Results(1) Chronic lowering of groundwater levels indicating a significant and unreasonable depletion of

supply if continued over the planning and implementation horizon.

(2) Significant and unreasonable reduction of groundwater storage.

(3) Significant and unreasonable seawater intrusion.

(4) Significant and unreasonable degraded water quality, including the migration of contaminant plumes that impair water supplies.

(5) Significant and unreasonable land subsidence that substantially interferes with surface land uses.

(6) Depletions of interconnected surface water that have significant and unreasonable adverse impacts on beneficial uses of the surface water.


Questions and Discussion

http://www.sonomacountygroundwater.org

http://www.sonomacountygroundwater.org/

General Groundwater Concepts for GSP Development in the Santa Rosa Plain Presentation OverviewHydrologic CycleAquifer Materials: Examples of Porosity Aquifer Materials: Hydraulic ConductivityMost Data on Aquifer Properties from Well LogsSlide Number 7Santa Rosa Plain 3-D Lithology ModelGroundwater Movement�Between Recharge and DischargeSlide Number 10Groundwater Levels Change�Seasonally and Climatically Groundwater Levels Change�When Discharge Exceeds Recharge Southern Santa Rosa Plain Example HydrographsGroundwater Levels in the Santa Rosa Plain: Changing Groundwater Flow PatternsGroundwater – Surface Water ConnectionGroundwater – Surface Water ConnectionGroundwater – Surface Water ConnectionGroundwater – Surface Water ConnectionGroundwater QualitySlide Number 20Slide Number 21Groundwater BudgetAquifer System and Groundwater Budget Responses to Groundwater PumpingSlide Number 24Slide Number 25SGMA Undesirable ResultsQuestions and Discussion

Documents

General Groundwater Concepts for GSP Development in the ...santarosaplaingroundwater.org/wp-content/uploads/5-7-18-Groundw… · General Groundwater Concepts for GSP Development in