Change in Groundwater Storage for the San Bernardino Basin Area Calendar Years 1934 to 2009

Transcription

1 Change in Groundwater Storage for the San Bernardino Basin Area Calendar Years 1934 to 2009 March 2010

2 Change in Groundwater Storage for the San Bernardino Basin Area Calendar Years 1934 to 2009 EXECUTIVE SUMMARY AND APPENDIX March 2010 San Bernardino Valley Municipal Water District Robert M. Tincher Manager of Engineering and Planning Steve Luhn GIS Coordinator

3 ACKNOWLEDGMENT Many public and private water agencies and various individuals have cooperated with the San Bernardino Valley Municipal Water District in furnishing the essential information upon which the Change in Storage Calculation is based. SBVMWD Change in Storage Report Page i

4 Change in Groundwater Storage For the San Bernardino Basin Area EXECUTIVE SUMMARY AND APPENDIX Table of Contents Acknowledgment i Table of Contents 1 1. Executive Summary 3 Figure 1.1 Comparison of DWR FORTRAN Model, SBVWCD EI model and SBVMWD GRID Model Results 4 Figure 1.2 Comparison of DWR FORTRAN Model, Geosciences model and SBVMWD GRID Model Results 5 Figure 1.3 SBBA, Sub-Basins, and Well Locations Map 7 Figure 1.4 Fall 2009 Depth to Groundwater Status Map 10 Figure 1.5 Comparison of Historic Low Water levels and Current (Fall 2009) Water Levels Bibliography Appendix A1 Data Changes in the SBVMWD Change in Storage Model Since the 2008 Report A2 San Bernardino Basin Area Cumulative Change Storage Annual Change in Storage Tabular change in storage data Cajon Sub-basin Cumulative Change Storage Annual Change in Storage Tabular change in storage data Hydrographs Tabular well depth data Devil Canyon Sub-basin Cumulative Change in Storage Annual Change in Storage A4 A8 A17 SBVMWD Change in Storage Report Page 1

5 Tabular change in storage data Hydrographs Tabular well depth data Lytle Creek Sub-basin Cumulative Change in Storage Annual Change in Storage Tabular change in storage data Hydrographs Tabular well depth data Pressure Zone Sub-basin Cumulative Change in Storage Annual Change in Storage Tabular change in storage data Hydrographs Tabular well depth data City Creek Sub-basin Cumulative Change in Storage Annual Change in Storage Tabular change in storage data Hydrographs Tabular well depth data Redlands Sub-basin Cumulative Change in Storage Annual Change in Storage Tabular change in storage data Hydrographs Tabular well depth data Mill Creek Sub-basin Cumulative Change in Storage Annual Change in Storage Tabular change in storage data Hydrographs Tabular well depth data Reservoir Sub-basin Cumulative Change in Storage Annual Change in Storage Tabular change in storage data Hydrographs Tabular well depth data Divide Sub-basin Cumulative Change in Storage Annual Change in Storage Tabular change in storage data Hydrographs Tabular well depth data SBVMWD Change in Storage Model A32 A44 A58 A76 A86 A98 A107 M1 SBVMWD Change in Storage Report Page 2

6 EXECUTIVE SUMMARY The San Bernardino Valley Municipal Water District (SBVMWD) has been calculating the change in groundwater storage for the San Bernardino Basin Area (SBBA) since The first calculation was completed for the years by the State of California Department of Water Resources (DWR) and the results were summarized in Bulletin 104-5, Meeting Water Demands in the Bunker Hill-San Timoteo Area, Geology, Hydrology, and Operation-Economics Studies, Text and Plates (Olson, pp ). The DWR change in storage values were calculated using the Specific Yield Method (Olson, pp ) and a mathematical model developed by TRW, Incorporated, Redondo Beach, California (TRW). In 1980, SBVMWD updated the change in storage calculation to include the years (Van Gelder). In the early 1990 s, SBVMWD created a new change in storage model (SBVMWD Model) using software developed by Environmental Systems Research Institute (ESRI), Redlands, California (For an explanation of how the model works see Appendix: SBVMWD Change in Storage Model). Results from the SBVMWD Model are presented to the SBVMWD Board of Directors and may be released in a report format. Like the earlier DWR model, the SBVMWD Model calculates the change in groundwater storage (volume) for the SBBA using the Specific Yield Method. In addition to the DWR and SBVMWD models, the San Bernardino Valley Water Conservation District (SBVWCD) and the U.S. Geological Survey (USGS) have created models for computing the change in storage for the SBBA. Although all four models use slightly different data sets and calculate the change in storage using different computer methods, their calculated values and results track remarkably well (Figures 1.1 and 1.2). The cumulative change in groundwater storage (CCIS) is a measure of the volume of water lost or gained in the SBBA as compared to the base year of The year 1934 was selected as the base year to correspond with the first year of the DWR base period, through (Motokane, pp ). The annual change in storage (ACIS) is simply a measure of the volume of water lost or gained in the basin during a year. This report presents the results from the SBVMWD Model for calendar years 1934 to SBVMWD Change in Storage Report Page 3

7 , , , , , , ,000-1,000,000 Figure 1.1. Comparison of DWR FORTRAN Model, SBVWCD EI and SBVMWD GRID Model Results SBVMWD GRID Model DWR FORTRAN Model* SBVWCD EI * Department of Water Resources, Bulletin 104-5, Text and Plates, page 97. Van Gelder, Change In Groundwater Storage 1980 Update, 5/20/81. SBVMWD - GIS March 2010 Cumulative Change in Storage (acre-feet) SBVMWD Change in Storage Report Page 4

8 , , , , ,000-1,000,000-1,200,000-1,400,000 Figure 1.2. Comparison of DWR FORTRAN Model, USGS MODFLOW Model and SBVMWD GRID Model Results SBVMWD GRID Model (2009) DWR FORTRAN Model (1981) Geoscience/USGS (4/2008) SBVMWD - GIS March 2010 Cumulative Change in Storage (acre-feet) SBVMWD Change in Storage Report Page 5

9 The SBVMWD Model uses the calendar year instead of the water year (October through September) to correspond with the United States Geological Survey MODFLOW groundwater model, which is dependent upon local pumping records kept by calendar year. The annual change in storage for calendar year 2009 was calculated to be approximately -78,400 acre-feet. Table 1.1 summarizes the distribution of the 2009 annual and cumulative change in storage among the various sub-basins (Figure 1.3), as defined in Bulletin (DWR, Plate 14, Basin Groundwater Storage Data). For 2009, the west end of the SBBA (Devil Canyon, Cajon, and Lytle Creek sub-basins) accounted for approximately 83% of the total decrease in annual change in storage for the San Bernardino Basin Area. This large decrease is likely attributed to the increase in well production and reduction of natural recharge due to below average precipitation over the past few years. The cumulative change in storage for calendar year 2009 was calculated to be approximately -433,000 acre-feet which is a 22% decrease from the previous year. Review of Figure 1.1 and 1.2 shows that the cumulative change in storage had been declining since Then, a gain in 2005 single-handedly erased the decline in storage over the past several years returning the basin to 2001 levels. However, since 2005, water levels have again been trending downward. SBVMWD Change in Storage Report Page 6

10 SBVMWD Change in Storage Report Page Miles Lytle Creek Cajon Devil Canyon Pressure Zone Reservoir Divide Redlands City Creek Mill Creek Figure 1.3. San Bernardino Basin Area (SBBA) Sub-Basins and Well Locations used in the Modeling Results

11 Table 1.1 also provides a basin index for each sub-basin. The basin index is simply the average, annual water level change for the sub-basin for the given year. For example, a basin index of -5.0 indicates that the average water level for the named subbasin decreased 5.0 feet for the given year. For 2009, the Lytle Creek sub-basin saw the largest change in water levels as it decreased 35 feet. The average change in water levels for the SBBA was a decrease of 10 feet. Table 1.1. Annual and cumulative change in storage for 2009 by sub-basin. Wells used 2009 Annual 2009 Cumulative Basin in 2009 Area Change in Change in Storage Index Sub-basin Model (acres) Storage (ft) 1 Cajon 4 9,833-25,204-74, Devil Canyon 12 7,105-27,693-54, Lytle Creek 10 5,899-28,620-40, Pressure Zone 19 15,965-11, , City Creek 17 21,284 18, , Redlands 6 5,113-3,331-4, Mill Creek 10 7, , Reservoir 6 2, , Divide 2 2, , ,309-78, ,012 The District and the primary water purveyors in the SBBA provided fall 2009 water level data for the model. The static depth to groundwater data used for the change in storage report were contoured and plotted in Figure 1.4 the Fall 2009 Depth to Groundwater Map. This 2009 depth to groundwater data was then subtracted from the historic low water levels to determine any areas where there may be new historic lows. Figure 1.5 shows the results of this comparison; areas in red indicate new historic lows. Liquefaction potential can be measured based upon water levels. The threat of liquefaction is reduced for water levels lower than 50 feet below ground surface (SCEC Report, March 1999, page 7). Figure 1.4 shows that fall 2009 water levels are below this threshold. SBVMWD Change in Storage Report Page 8

12 Since the release of last year s April 2008 report, SBVMWD has made no changes to the model or wells modeled as indicated in Appendix, page A2. SBVMWD Change in Storage Report Page 9

13 SBVMWD Change in Storage Report Page Miles Map Document: (Y:\2008\1639_Basin Technical Advisory Commitee (BTAC)\May 2009 Update of Regional WaterManagement Plan \CISrptDTWmapFall09update.mxd) 4/12/ :12:46 PM FALL 2009 DEPTH TO GROUNDWATER MAP Figure 1.4. CHANGE IN STORAGE REPORT Deep: -475 ft Bunker Hill Boundary Model Sub-Basin Boundaries Depth to Ground Water (Fall 2009) Shallow : -30 ft Legend

14 SBVMWD Change in Storage Report Page Miles Map Document: (\\gisws\gisprojects\2008\1639_basin Technical Advisory Commitee (BTAC)\ May 2009 Update of Regional Water Management Plan\CurrentMinusHistLowFall09update.mxd) 11/9/ :27:52 PM 0 Lower : -310 ft Bunker Hill Boundary Model Sub-Basin Boundaries [Fall 2009 Water Levels] - [Historic Low Water Levels] Higher : 235 ft Legend COMPARISON OF HISTORIC LOW WATER LEVELS AND CURRENT (FALL 2009) WATER LEVELS FOR THE SAN BERNARDINO BASIN AREA CHANGE IN STORAGE REPORT (Areas in red indicate current water levels are lower than historic low water levels and areas in blue indicate current water levels are above the historic low values). Figure 1.5.

15 2. Bibliography Basin Groundwater Storage Data, San Bernardino Valley Municipal Water District library call number GB 1025, C2 S26, Department of Water Resources (DWR), Meeting Water Demands in the Bunker Hill - San Timoteo Area, Geology, Hydrology, and Operation Economics Studies, Text and Plates, February Motokane, Earl S., Evaluation of the Base Period for the Bunker Hill-San Timoteo Area Investigation. Meeting Water Demands in the Bunker Hill - San Timoteo Area, Geology, Hydrology, and Operation Economics Studies, Text and Plates, February 1971, pp Olson, L.J. and Stig J. Johanson, Specific Yield and Storage Determination. Meeting Water Demands in the Bunker Hill - San Timoteo Area, Geology, Hydrology, and Operation Economics Studies, Text and Plates, February San Bernardino Valley Water Conservation District (SBVWCD), Engineering Investigation of the Bunker Hill Basin, , March San Bernardino Valley Water Conservation District (SBVWCD), Engineering Investigation of the Bunker Hill Basin, , March Southern California Earthquake Center (SCEC), University of Southern California. Recommended Procedures for Implementation of DMG Special Publication 117 Guidelines for Analyzing and Mitigating Liquefaction Hazards in California, March TRW, Incorporated. Simulation Program for Planned Utilization of the San Bernardino Valley and Riverside Ground Water Basins, Second Report, Report No R000, October Utah Geological Survey web site (UGS): University of Washington (UW) web site: Van Gelder, Randy, Change in Groundwater Storage 1980 Update, May 20, Western San Bernardino Watermaster (Watermaster), Annual Report of the Western- San Bernardino Watermaster for Calendar Year 1997, August 1, SBVMWD Change in Storage Report Page 12

16 APPENDIX Change in Groundwater Storage for the San Bernardino Basin Area Page A1

17 Data Changes in the SBVMWD Change in Storage Model Since April 2009 Report Cajon Sub-Basin and Wells: No Changes. Devil Canyon Sub-Basin and Wells: No Changes. Lytle Creek Sub-Basin and Wells: No Changes. Pressure Zone Sub-Basin and Wells: No Changes. City Creek Sub-Basin and Wells: No Changes. Redlands Sub-Basin and Wells: No Changes. Mill Creek Sub-Basin and Wells: No Changes. Reservoir Sub-Basin and Wells: No Changes. Divide Sub-Basin and Wells: No Changes. Page A2

18 (THIS PAGE INTENTIONALLY LEFT BLANK) Page A3

19 500, , , , , , , , , , ,000 Cumulative Change in Storage as compared to Base Year 1934 (acre-feet) Cumulative Change in Storage for the San Bernardino Basin Area Year SBVMWD - GIS March 2010 Page A4

20 500, , , , , , , , , , ,000 Annual Change in Storage (acre-feet) Annual Change in Storage for the San Bernardino Basin Area Year SBVMWD - GIS March 2010 Page A5

21 San Bernardino Valley Municipal Water District Change In Storage for the San Bernardino Basin Area (1) (2) (3) (4) Annual Cummulative Basin Change in Groundwater Change in Groundwater Index Storage Storage Year (ft.) (acre-feet) (acre-feet) 1934 n/a n/a ,870 20, ,523 24, , , , , , , , , , , , , , , , , , , , , , , , , ,045 43, ,538-24, ,214-99, ,167-41, , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , ,367-73, ,864-89, , , , , , , , , , , , , , ,259 Page A6

22 San Bernardino Valley Municipal Water District Change In Storage for the San Bernardino Basin Area (1) (2) (3) (4) Annual Cummulative Basin Change in Groundwater Change in Groundwater Index Storage Storage Year (ft.) (acre-feet) (acre-feet) ,634-8, ,368 38, , , , , , , , , , , , , , , ,184 72, ,879-13, , , , , , , , , ,725-5, ,564-51, ,107 32, ,809-17, ,523-25, ,929 74, ,868-18, , , , , , , , , , , , , , , , , , , , ,012 Page A7

23 Page A8 MONITOR WELL 2N5W33K01 15 I CAJON NO 3 1N5W03A Miles CAJON NO 1 2N5W33K01 CAJON NO 2 1N5W03H02 Cajon Creek Riverside Drive 215 Lytle Creek Highland Avenue Darby 1N4W29E01 E-6W BASELINE 1N4W32N Cajon Sub-Basin Well MT VERNON WELL 1N4W31A01S

24 80,000 60,000 40,000 20, ,000-40,000-60,000-80,000 Cumulative Change in Storage as compared to Base Year 1934 (acre-feet) Cumulative Change in Storage for the Cajon Sub-Basin Years SBVMWD - GIS March 2010 Page A9

25 60,000 50,000 40,000 30,000 20,000 10, ,000-20,000-30,000-40,000 Annual Change in Storage (acre-feet) Annual Change in Storage for the Cajon Sub-Basin Years SBVMWD - GIS March 2010 Page A10

26 San Bernardino Valley Municipal Water District Change In Storage for the Cajon Sub-basin (1) (2) (3) (4) Annual Cummulative Basin Change in Groundwater Change in Groundwater Index Storage Storage Year (ft.) (acre-feet) (acre-feet) n/a ,727 2, ,653-2, ,215 12, ,080 30, ,005 25, ,091 27, ,881 52, ,541 37, ,803 48, ,376 59, ,632 56, ,790 45, ,498 40, ,133 24, ,542 12, ,595 9, ,817-1, ,903 8, ,833-4, ,860-9, ,534-20, ,316-36, ,655-27, ,153-9, ,349-18, ,204-27, ,502-43, ,666-48, ,479-47, ,714-53, ,836-59, ,858-67, ,840-61, ,771-52, ,982-13, ,336-19, ,004-22, ,262-34, ,783-16, , ,326-30, ,760-24, ,387-43,273 Page A11

27 San Bernardino Valley Municipal Water District Change In Storage for the Cajon Sub-basin (1) (2) (3) (4) Annual Cummulative Basin Change in Groundwater Change in Groundwater Index Storage Storage Year (ft.) (acre-feet) (acre-feet) ,276 14, ,324 5, ,197 49, ,611 68, ,017 37, ,661 74, ,249 54, ,328 40, ,458 37, ,350 14, ,895-6, ,038-18, ,210-32, ,305-34, ,699 10, ,487 20, ,849-10, ,786 7, ,213-18, ,497-20, ,321 11, ,134 2, ,417-12, ,244-23, ,902-36, ,578-43, ,377-57, ,908-11, ,090-29, ,901-44, ,780-49, ,204-74,687 Page A12

28 Hydrographs for the Cajon Sub-Basin Wells E-6W BASELINE 1N4W32N CAJON NO 1 1N5W03H01S DARBY 1N4W29E01S MT VERNON WELL 1N4W31A01S CAJON NO 2 1N5W03H02 MONITOR WELL 2N5W33K01 CAJON N0 3 1N5W03A Year SBVMWD - GIS March 2010 Depth to Water (Feet) Page A13

29 San Bernardino Valley Municipal Water District Change in Storage for the San Bernardino Basin Area CAJON SUB-BASIN Shaded cells with no values represent no depth available; shaded cells with values represent interpolated depths Depth to Water (ft.) E-6W BASELINE CAJON NO 1 DARBY MT VERNON WELL CAJON NO 2 MONITOR WELL CAJON N0 3 1N4W32N 1N5W03H01S 1N4W29E01S 1N4W31A01S 1N5W03H02 2N5W33K01 1N5W03A02 Year Source Source Source Source Substitute Added Source Substitute Page A14

30 San Bernardino Valley Municipal Water District Change in Storage for the San Bernardino Basin Area CAJON SUB-BASIN Shaded cells with no values represent no depth available; shaded cells with values represent interpolated depths Depth to Water (ft.) E-6W BASELINE CAJON NO 1 DARBY MT VERNON WELL CAJON NO 2 MONITOR WELL CAJON N0 3 1N4W32N 1N5W03H01S 1N4W29E01S 1N4W31A01S 1N5W03H02 2N5W33K01 1N5W03A02 Year Source Source Source Source Substitute Added Source Substitute Page A15

31 San Bernardino Valley Municipal Water District Change in Storage for the San Bernardino Basin Area CAJON SUB-BASIN Shaded cells with no values represent no depth available; shaded cells with values represent interpolated depths Depth to Water (ft.) E-6W BASELINE CAJON NO 1 DARBY MT VERNON WELL CAJON NO 2 MONITOR WELL CAJON N0 3 1N4W32N 1N5W03H01S 1N4W29E01S 1N4W31A01S 1N5W03H02 2N5W33K01 1N5W03A02 Year Source Source Source Source Substitute Added Source Substitute Page A16

32 Page A17 Cajon Creek Lytle Creek I DEVIL CANYON NO 2 1N4W07F01S DEVIL CANYON NO. 1 1N4W08M Cajon Boulevard Miles DEVIL CANYON NO. 5 1N4W08M02 ELLENA BROS WELL 2 1N4W08P01 NEWMARK NO 1 1N4W16E01S KENDALL 1N4W21B02 WATERMAN AVE. 1N4W27A01S LEROY 1N4W27A ST 30 Highland Avenue Devil Canyon Sub-Basin ST 18 Waterman Avenue NONE PROVIDED 1N4W23Q04 LYNWOOD 1N4W26A01 Plant No N4W25M01 Well 40TH STREET WELL 1N4W14P01 24B 1N4W25C02 25A 1N4W26A01 PLANT NO 107 1N4W25F

33 40,000 30,000 20,000 10, ,000-20,000-30,000-40,000-50,000-60,000 Cumulative Change in Storage as compared to base Year 1934 (acre-feet) Cumulative Change in Storage for the Devil Canyon Sub-Basin Years SBVMWD - GIS March 2010 Page A18

34 30,000 20,000 10, ,000-20,000-30,000 Annual Change in Storage (acre-feet) Annual Change in Storage for the Devil Canyon Sub-Basin Years SBVMWD - GIS March 2010 Page A19

35 San Bernardino Valley Municipal Water District Change In Storage for the Devil Canyon Sub-basin (1) (2) (3) (4) Annual Cummulative Basin Change in Groundwater Change in Groundwater Index Storage Storage Year (ft.) (acre-feet) (acre-feet) n/a ,769-2, ,114 6, ,514 23, , ,440 21, ,997 30, ,536 28, ,596 31, , , ,572 28, ,269 23, ,490 15, ,409 11, ,602 2, ,346-5, ,277-2, ,239-11, ,422-13, ,555-10, ,872-18, ,442-19, ,764-14, ,562-17, ,048-22, ,460-33, ,093-38, ,393-42, ,666-47, ,959-54, ,037-58, ,468-50, ,062-49, ,267-21, , , ,604-27, ,270-24, ,425-14, ,298-22, ,945-24, ,418-25,921 Page A20

36 San Bernardino Valley Municipal Water District Change In Storage for the Devil Canyon Sub-basin (1) (2) (3) (4) Annual Cummulative Basin Change in Groundwater Change in Groundwater Index Storage Storage Year (ft.) (acre-feet) (acre-feet) ,493-1, ,963-4, ,117 12, ,812 14, ,224 16, ,938 30, ,102 26, ,029 18, ,328 12, ,819 2, ,764-3, ,326-14, ,063-21, ,576-27, ,528-32, ,236-17, , ,283-10, ,236-13, ,519-17, ,572-15, ,749-1, ,853-6, ,407-13, ,345-17, ,237-23, ,138-52, ,289-42, ,432-14, ,131-23, ,047-26, ,693-54,301 Page A21

37 Hydrograph for the Devil Canyon Sub-Basin Wells NEWMARK NO 1 1N4W16E01S WATERMAN AV. 1N4W27A01S DEVIL CANYON NO 2 1N4W07F01S PLANT NO 111 1N4W25M01 PLANT NO 107 1N4W25F KENDALL 1N4W21B02 NONE PROVIDED 1N4W23Q04 LEROY 1N4W27A DEVIL CANYON NO 1 1N4W08M01 24B 1N4W25C02 25A 1N4W26A01 ELLENA BROS WELL 2 1N4W08P01 DEVIL CANYON NO 5 1N4W08M02 LYNWOOD 1N4W26E02 40TH ST WELL 1N4W14P01 Added Source Year SBVMWD - GIS March 2010 Depth to Water (Feet) Page A22

38 San Bernardino Valley Municipal Water District Change in Storage for the San Bernardino Basin Area DEVIL CANYON SUB-BASIN Shaded cells with no values represent no depth available; shaded cells with values represent interpolated depths Depth to Water (ft.) NEWMARK NO 1 WATERMAN AV. DEVIL CANYON NO 2 PLANT NO 111 PLANT NO 107 KENDALL NONE PROVIDED 1N4W16E01S 1N4W27A01S 1N4W07F01S 1N4W25M01 1N4W25F 1N4W21B02 1N4W23Q04 Year Source Source Source Source Substitute Added Source Added Source Page A23

39 San Bernardino Valley Municipal Water District Change in Storage for the San Bernardino Basin Area DEVIL CANYON SUB-BASIN Shaded cells with no values represent no depth available; shaded cells with values represent interpolated depths Depth to Water (ft.) NEWMARK NO 1 WATERMAN AV. DEVIL CANYON NO 2 PLANT NO 111 PLANT NO 107 KENDALL NONE PROVIDED 1N4W16E01S 1N4W27A01S 1N4W07F01S 1N4W25M01 1N4W25F 1N4W21B02 1N4W23Q04 Year Source Source Source Source Substitute Added Source Added Source Page A24

40 San Bernardino Valley Municipal Water District Change in Storage for the San Bernardino Basin Area DEVIL CANYON SUB-BASIN Shaded cells with no values represent no depth available; shaded cells with values represent interpolated depths Depth to Water (ft.) NEWMARK NO 1 WATERMAN AV. DEVIL CANYON NO 2 PLANT NO 111 PLANT NO 107 KENDALL NONE PROVIDED 1N4W16E01S 1N4W27A01S 1N4W07F01S 1N4W25M01 1N4W25F 1N4W21B02 1N4W23Q04 Year Source Source Source Source Substitute Added Source Added Source Page A25

41 San Bernardino Valley Municipal Water District Change in Storage for the San Bernardino Basin Area DEVIL CANYON SUB-BASIN 'Shaded cells with no values represent no depth available; shaded cells with values represent interpolated depths Depth to Water (ft). LEROY DEVIL CANYON NO 1 24B 25A ELLENA BROS WELL 2 DEVIL CANYON NO 5 40TH ST WELL 1N4W27A 1N4W08M01 1N4W25C02 1N4W26A01 1N4W08P01 1N4W08M02 1N4W14P01 Year Substitute Added Source Substitute Substitute Added Source Added Source Added Source Page A26

42 San Bernardino Valley Municipal Water District Change in Storage for the San Bernardino Basin Area DEVIL CANYON SUB-BASIN 'Shaded cells with no values represent no depth available; shaded cells with values represent interpolated depths Depth to Water (ft). LEROY DEVIL CANYON NO 1 24B 25A ELLENA BROS WELL 2 DEVIL CANYON NO 5 40TH ST WELL 1N4W27A 1N4W08M01 1N4W25C02 1N4W26A01 1N4W08P01 1N4W08M02 1N4W14P01 Year Substitute Added Source Substitute Substitute Added Source Added Source Added Source Page A27

43 San Bernardino Valley Municipal Water District Change in Storage for the San Bernardino Basin Area DEVIL CANYON SUB-BASIN 'Shaded cells with no values represent no depth available; shaded cells with values represent interpolated depths Depth to Water (ft). LEROY DEVIL CANYON NO 1 24B 25A ELLENA BROS WELL 2 DEVIL CANYON NO 5 40TH ST WELL 1N4W27A 1N4W08M01 1N4W25C02 1N4W26A01 1N4W08P01 1N4W08M02 1N4W14P01 Year Substitute Added Source Substitute Substitute Added Source Added Source Added Source Page A28

44 San Bernardino Valley Municipal Water District Change in Storage for the San Bernardino Basin Area DEVIL CANYON SUB-BASIN 'Shaded cells with no values represent no depth available; shaded cells with values represent interpolated depths Depth to Water (ft) LYNWOOD 1N4W26E02 Year Substitute Page A29

45 San Bernardino Valley Municipal Water District Change in Storage for the San Bernardino Basin Area DEVIL CANYON SUB-BASIN 'Shaded cells with no values represent no depth available; shaded cells with values represent interpolated depths Depth to Water (ft) LYNWOOD 1N4W26E02 Year Substitute Page A30

46 San Bernardino Valley Municipal Water District Change in Storage for the San Bernardino Basin Area DEVIL CANYON SUB-BASIN 'Shaded cells with no values represent no depth available; shaded cells with values represent interpolated depths Depth to Water (ft) LYNWOOD 1N4W26E02 Year Substitute Page A31

47 State St Page A32 15 I FU 26 1N5W07H01S Sierra Avenue Riverside Avenue Miles FU 32 1N5W16K01 Linden Avenue Lytle Creek FU 3 1N5W22F02S Cajon Creek FU 8 1N5W15Q02S MUSCOY NO 2 1N5W23A01S FU13 1N5W22A01 Lytle Creek Sub-Basin WELL NO 05 1N5W25E01S Highland Avenue WELL NO 4 1N5W24E WELL NO 02 1N5W23Q00S Well I 215 WELL NO 7 1N5W36H04S LYTLE CREEK WELL N0 2 1N5W36K01 CAJON BLVD

48 Cumulative Change in Storage as compared to Base Year 1934 (acre-feet) Cumulative Change in Storage for the Lytle Creek Sub-Basin 100,000 80,000 60,000 40,000 20, ,000-40,000-60,000-80, SBVMWD - GIS March 2010 Page A33 Years

49 Annual Change in Storage (acre-feet) Annual Change in Storage for the Lytle Creek Sub-Basin 120, ,000 80,000 60,000 40,000 20, ,000-40, SBVMWD - GIS March 2010 Page A34 Years

50 San Bernardino Valley Municipal Water District Change In Storage for the Lytle Creek Sub-basin (1) (2) (3) (4) Annual Cummulative Basin Change in Groundwater Change in Groundwater Index Storage Storage Year (ft.) (acre-feet) (acre-feet) n/a ,039 11, ,524 15, ,561 34, ,297 67, , ,717 57, ,509 90, ,956 67, ,515 78, ,224 79, ,656 59, ,567 41, ,153 24, ,594-1, ,579-14, ,057-26, ,964-36, ,256-13, ,523-18, ,738-21, ,853-31, ,361-44, , ,451 4, ,150-12, ,108-28, ,046-51, ,366-49, , ,938-61, ,831-76, ,805-61, ,429-29, ,431-9, ,194 69, ,552 72, ,053 55, ,851 36, ,643 26, ,741 23, ,131 13, ,859-5, ,573-17,044 Page A35

51 San Bernardino Valley Municipal Water District Change In Storage for the Lytle Creek Sub-basin (1) (2) (3) (4) Annual Cummulative Basin Change in Groundwater Change in Groundwater Index Storage Storage Year (ft.) (acre-feet) (acre-feet) ,162 43, ,964 49, ,588 47, ,544 39, ,912 42, ,372 88, ,730 82, ,599 54, ,602 46, ,422 22, ,867-5, ,178-28, ,083-50, ,959-40, ,721-7, ,106 70, ,516 51, ,655 67, ,288 59, ,815 40, ,005 61, ,144 37, ,334 9, ,576-25, ,205-53, ,542-66, ,866-74, ,835 28, ,791 23, , ,482-12, ,620-40,796 Page A36

52 Hydrograph for the Lytle Creek Sub-Basin Wells FU 26 1N5W07H01S MUSCOY NO 2 1N5W23A01S WELL NO 05 1N5W25E01S WELL NO 07 1N5W36H04S FU 3 1N5W22F02S WELL NO 02 1N5W23Q00S FU 8 1N5W15Q02S WELL NO 4 1N5W24E FU 32 1N5W16K01 FU 13 1N5W22A01 LYTLE CREEK NO 2 1N5W36K01 Year Depth to Water (Feet) Page A37

53 San Bernardino Valley Municipal Water District Change in Storage for the San Bernardino Basin Area LYTLE CREEK SUB-BASIN Shaded cells with no values represent no depth available; shaded cells with values represent interpolated depths Depth to Water (ft.) FU 26 MUSCOY NO 2 WELL NO 05 WELL NO 07 FU 3 WELL NO 02 FU 8 1N5W07H01S 1N5W23A01S 1N5W25E01S 1N5W36H04S 1N5W22F02S 1N5W23Q00S 1N5W15Q02S Year Source Source Source Source Source Source Source Page A38

54 San Bernardino Valley Municipal Water District Change in Storage for the San Bernardino Basin Area LYTLE CREEK SUB-BASIN Shaded cells with no values represent no depth available; shaded cells with values represent interpolated depths Depth to Water (ft.) FU 26 MUSCOY NO 2 WELL NO 05 WELL NO 07 FU 3 WELL NO 02 FU 8 1N5W07H01S 1N5W23A01S 1N5W25E01S 1N5W36H04S 1N5W22F02S 1N5W23Q00S 1N5W15Q02S Year Source Source Source Source Source Source Source Page A39

55 San Bernardino Valley Municipal Water District Change in Storage for the San Bernardino Basin Area LYTLE CREEK SUB-BASIN Shaded cells with no values represent no depth available; shaded cells with values represent interpolated depths Depth to Water (ft.) FU 26 MUSCOY NO 2 WELL NO 05 WELL NO 07 FU 3 WELL NO 02 FU 8 1N5W07H01S 1N5W23A01S 1N5W25E01S 1N5W36H04S 1N5W22F02S 1N5W23Q00S 1N5W15Q02S Year Source Source Source Source Source Source Source Page A40

56 San Bernardino Valley Municipal Water District Change in Storage for the San Bernardino Basin Area LYTLE CREEK SUB-BASIN Shaded cells with no values represent no depth available; shaded cells with values represent interpolated depths Depth to Water (ft) WELL NO 4 FU 32 FU 13 LYTLE CREEK NO 2 1N5W24E 1N5W16K01 1N5W22A01 1N5W36K01 Year Added Source Substitute Substitute Added Source Page A41

57 San Bernardino Valley Municipal Water District Change in Storage for the San Bernardino Basin Area LYTLE CREEK SUB-BASIN Shaded cells with no values represent no depth available; shaded cells with values represent interpolated depths Depth to Water (ft) WELL NO 4 FU 32 FU 13 LYTLE CREEK NO 2 1N5W24E 1N5W16K01 1N5W22A01 1N5W36K01 Year Added Source Substitute Substitute Added Source Page A42

58 San Bernardino Valley Municipal Water District Change in Storage for the San Bernardino Basin Area LYTLE CREEK SUB-BASIN Shaded cells with no values represent no depth available; shaded cells with values represent interpolated depths Depth to Water (ft) WELL NO 4 FU 32 FU 13 LYTLE CREEK NO 2 1N5W24E 1N5W16K01 1N5W22A01 1N5W36K01 Year Added Source Substitute Substitute Added Source Page A43

59 Page A44 I ST 30 27TH& ACACIA 1S4W27M02 23rd St & E. St 1N4W27N01 GARNER PARK 1S4W04E04 Lytle Creek 31 ST 1N4W27B01 16TH & CRESTVIEW 1N4W35L01S 16TH & SIERRA WAY 1N4W34G03 Mount Vernon Avenue Base Line Street FELDHEYM LIBRARY 1A4W03N06 "E" Street ANTIL 6 1S4W02K08S 5th Street Sterling Avenue LOCAL NO. 2 1S4W12B04 LENA RD 1S4W11K S4W13F02S Waterman Avenue Santa Ana River BURBANK ELEMENTARY 215 1S4W10Q03 MILL CENTER 1S4W14E LYTLE CREEK PARK MILL & D STREET 1S4W23A05S 10 1S4W09L05 1S4W10N06S WARREN 2 1S4W22H04 VALLEY COLLEGE 1S4W16C Miles ORANGE SHOW 1S4W15F08 BACKYARD 1S4W22D07 Antil Well No. 3 1S4W02K01 TREATMENT PLANT 1S4W22B11 Pressure Zone Sub-Basin 21 1S4W13L02 USGS Lugonia 1S3W19G02 WARREN 3 1S4W22H03 Well 34 1S4W24K01S Elmer Digneo Park 1S4W25E07 MISSION # 1 1S3W19L01

60 Cumulative Change in Storage as compared to Base Year 1934 (acre-feet) Cumulative Change in Storage for the Pressure Zone Sub-Basin 40,000 20, ,000-40,000-60,000-80, , , , SBVMWD - GIS March Page A45 Years

61 Annual Change in Storage for the Pressure Zone Sub-Basin 25,000 20,000 15,000 10,000 5, ,000-10,000-15,000-20,000-25, Annual Change in Storage (acre-feet) SBVMWD - GIS March Page A46 Years

62 San Bernardino Valley Municipal Water District Change In Storage for the Pressure Zone Sub-basin (1) (2) (3) (4) Annual Cummulative Basin Change in Groundwater Change in Groundwater Index Storage Storage Year (ft.) (acre-feet) (acre-feet) n/a ,484-2, , ,961 4, ,638 13, , ,610 15, ,507 24, ,289 23, , ,893 28, ,190 24, ,694 26, ,229 17, ,514 11, , , ,354-6, ,467-8, ,921-17, , ,810-26, ,500-33, ,713-35, ,289-38, ,988-45, ,334-46, ,866-62, ,182-74, ,718-77, ,963-89, ,795-94, ,307-99, , , , ,683-83, ,418-76, ,741-80, ,932-74, , ,910-67, ,883-71, ,218-69, ,818-78,512 Page A47

63 San Bernardino Valley Municipal Water District Change In Storage for the Pressure Zone Sub-basin (1) (2) (3) (4) Annual Cummulative Basin Change in Groundwater Change in Groundwater Index Storage Storage Year (ft.) (acre-feet) (acre-feet) ,610-56, ,020-52, ,540-29, ,127-19, ,581-13, ,379 1, , ,130-11, ,945-19, ,335-23, ,820-35, ,680-43, ,770-56, ,955-69, , ,947-66, ,268-77, ,202-71, , ,802-59, ,938-50, ,219-73, ,093-82, ,280-87, , , , , , , , , , , , , , , ,861 Page A48

64 Hydrographs for the Pressure Zone Sub-Basin WARREN 3 01S04W22H03S 21 01S04W13L02S S04W23A05S ANTIL WELL NO 3 1S4W02K01S 34 1S4W24K01S 23RD STREET 1N4W27N01S MILL & D ST 1S4W10N06S S04W13F02S ANTIL 6 1S4W02K08S 16TH & CRESTVIEW 1N4W35L01S USGS LUGONIA 1S3W19G02 GARNER PARK 1S4W04E04 31 ST 1N4W27B01 LOCAL NO. 2 1S4W12B04 MISSION #1 1S3W19L01 16TH ST & SIERRA WY 1N4W34G03 WARREN 2 1S4W22H04 27TH& ACACIA 1S4W27M02 FELDHEYM LIBRARY 1S4W03N06 LENA ROAD 1S4W11K05 TREATMENT PLANT 1S4W22B01 ELMER DIGNEO PARK 1S4W25E07 ORANGE SHOW 1S4W15F08 BURBANK ELEMENTARY 1S4W10Q03 LYTLE CREEK PARK 1S4W09L05 VALLEY COLLEGE 1S4W16C07 MILL CENTER 1S4W14E13 GARNER PARK 1S4W04E05 BACKYARD 1S4W22D07 Year Depth to Water (Feet) Page A49

65 San Bernardino Valley Municipal Water District Change in Storage for the San Bernardino Basin Area PRESSURE ZONE SUB-BASIN Shaded cells with no values represent no depth available; shaded cells with values represent interpolated depths Depth to Water (ft.) WARREN ANTIL WELL NO RD STREET MILL & D ST S04W22H03S 01S04W13L02S 01S04W23A05S 1S4W02K01S 1S4W24K01S 1N4W27N01S 1S4W10N06S 01S04W13F02S Year Source Source Source Source Source Source Source Source Page A50

66 San Bernardino Valley Municipal Water District Change in Storage for the San Bernardino Basin Area PRESSURE ZONE SUB-BASIN Shaded cells with no values represent no depth available; shaded cells with values represent interpolated depths Depth to Water (ft.) WARREN ANTIL WELL NO RD STREET MILL & D ST S04W22H03S 01S04W13L02S 01S04W23A05S 1S4W02K01S 1S4W24K01S 1N4W27N01S 1S4W10N06S 01S04W13F02S Year Source Source Source Source Source Source Source Source Page A51

67 Year San Bernardino Valley Municipal Water District Change in Storage for the San Bernardino Basin Area PRESSURE ZONE SUB-BASIN (Continued) Shaded cells with no values represent no depth available; shaded cells with values represent interpolated depths Depth to Water (ft.) ANTIL 6 16TH & CRESTVIEW USGS LUGONIA GARNER PARK 31 ST LOCAL NO. 2 MISSION #1 16TH ST & SIERRA WY 1S4W02K08S 1N4W35L01S 1S3W19G02 1S4W04E04 1N4W27B01 1S4W12B04 1S3W19L01 1N4W34G03 Source Substitute Added Source Added Source Added Source Added Source Substitute Substitute Page A52

68 Year San Bernardino Valley Municipal Water District Change in Storage for the San Bernardino Basin Area PRESSURE ZONE SUB-BASIN (Continued) Shaded cells with no values represent no depth available; shaded cells with values represent interpolated depths Depth to Water (ft.) ANTIL 6 16TH & CRESTVIEW USGS LUGONIA GARNER PARK 31 ST LOCAL NO. 2 MISSION #1 16TH ST & SIERRA WY 1S4W02K08S 1N4W35L01S 1S3W19G02 1S4W04E04 1N4W27B01 1S4W12B04 1S3W19L01 1N4W34G03 Source Substitute Added Source Added Source Added Source Added Source Substitute Substitute Page A53

69 Year San Bernardino Valley Municipal Water District Change in Storage for the San Bernardino Basin Area PRESSURE ZONE SUB-BASIN (Continued) Shaded cells with no values represent no depth available; shaded cells with values represent interpolated depths Depth to Water (ft.) WARREN 2 27TH& ACACIA FELDHEYM LIBRARY LENA ROAD TREATMENT PLANT ELMER DIGNEO PARK ORANGE SHOW BURBANK ELEMENTARY 1S4W22H04 1S4W27M02 1S4W03N06 1S4W11K05 1S4W22B01 1S4W25E07 1S4W15F08 1S4W10Q03 Substitute Substitute Added Source Added Source Added Source Added Source Added Source Added Source Page A54

70 Year San Bernardino Valley Municipal Water District Change in Storage for the San Bernardino Basin Area PRESSURE ZONE SUB-BASIN (Continued) Shaded cells with no values represent no depth available; shaded cells with values represent interpolated depths Depth to Water (ft.) WARREN 2 27TH& ACACIA FELDHEYM LIBRARY LENA ROAD TREATMENT PLANT ELMER DIGNEO PARK ORANGE SHOW BURBANK ELEMENTARY 1S4W22H04 1S4W27M02 1S4W03N06 1S4W11K05 1S4W22B01 1S4W25E07 1S4W15F08 1S4W10Q03 Substitute Substitute Added Source Added Source Added Source Added Source Added Source Added Source Page A55

71 Year San Bernardino Valley Municipal Water District Change in Storage for the San Bernardino Basin Area PRESSURE ZONE SUB-BASIN (Continued) Shaded cells with no values represent no depth available; shaded cells with values represent interpolated depths Depth to Water (ft.) LYTLE CREEK PARK VALLEY COLLEGE MILL CENTER GARNER PARK BACKYARD 1S4W09L05 1S4W16C07 1S4W14E13 1S4W04E05 1S4W22D07 Added Source Added Source Added Source Added Source Added Source Page A56

72 Year San Bernardino Valley Municipal Water District Change in Storage for the San Bernardino Basin Area PRESSURE ZONE SUB-BASIN (Continued) Shaded cells with no values represent no depth available; shaded cells with values represent interpolated depths Depth to Water (ft.) LYTLE CREEK PARK VALLEY COLLEGE MILL CENTER GARNER PARK BACKYARD 1S4W09L05 1S4W16C07 1S4W14E13 1S4W04E05 1S4W22D07 Added Source Added Source Added Source Added Source Added Source Page A57

73 Page A th Street I Waterman Avenue Miles 10 WHITTIER AVE 1S3W31A03 Base Line Street San Bernardino Avenue Highland Avenue PLANT N0. 6 1N4W36Q01 Santa Ana River Redlands Boulevard 39 1S3W29Q02 Plant No. 14 1S4W01K04 DOMEST. WELL 1S3W17C Plant No. 68 1N3W31M Alabama Street 41 1S3W28H01S PLANT N S3W4N NONE PROVIDED 1N3W34L S3W21H01S PLANT N N4W25A01 Victoria & Baseline 1N3W32N01 ST 30 PLANT N N3W33F01S PLANT N S3W02J ORANGE 5 1S3W15F02S Orange Street Patton Hospital 1N3W29M02 PLANT N N3W28P01 SBVWCD N0. 4 1S3W11H01 AIRPORT N0. 2 1S3W13M01 Gr Rees No. 1 1S3W23A City Creek Sub-Basin None Provided 1S3W02J SBVWCD N0. 3 1S3W12J01 SAN BERNARDINO AVE 1 1S3W23A03 Well SBVWCD N0. 1 1S2W07B01 Santa Ana River

74 Cumulative Change in Storage as compared to Base Year 1934 (acre-feet) Cumulative Change in Storage for the City Creek Sub-Basin 150, ,000 50, , , , , , , SBVMWD - GIS March Page A59 Years

75 Annual Change in Storage (acre-feet) Annual Change in Storage for the City Creek Sub-Basin 100,000 80,000 60,000 40,000 20, ,000-40,000-60,000-80, SBVMWD - GIS March Page A60 Years

76 San Bernardino Valley Municipal Water District Change In Storage for the City Creek Sub-basin (1) (2) (3) (4) Annual Cummulative Basin Change in Groundwater Change in Groundwater Index Storage Storage Year (ft.) (acre-feet) (acre-feet) n/a ,179-2, ,802-4, ,853 49, , , , , ,467 81, , , ,496 88, , , , , ,458 95, ,667 84, ,299 53, ,663 27, ,455 11, ,241-10, ,812-42, , ,500-53, ,873-62, ,914-81, , , , , ,490-91, , , , , , , , , , , , , , , , , , , , , ,460-84, ,746-90, ,443-81, , , , , , , , , , , ,825 Page A61

77 San Bernardino Valley Municipal Water District Change In Storage for the City Creek Sub-basin (1) (2) (3) (4) Annual Cummulative Basin Change in Groundwater Change in Groundwater Index Storage Storage Year (ft.) (acre-feet) (acre-feet) ,758-54, ,951-10, ,966 48, ,804 65, ,897 74, ,890 89, ,823 82, ,130 46, ,038 25, ,659 6, ,578-8, ,028-69, ,017-98, , , , ,087-83, ,573-62, ,221-46, , ,021-61, ,478-27, ,118-58, , , , , , , , , , , , , , , , , , , , ,528 Page A62

78 Hydrograph for City Creek Sub-Basin Wells PLANT N S3W04N PLANT N0. 120A 1S3W02J PLANT N S3W02J PLANT N N3W33F01S DOMEST. WELL #6 1S3W17C 32 1S3W21H01S ORANGE 5 1S3W15F02S PLANT N S4W01K04S GR REES N0. 1 1S3W23A 41 1S3W28H01S PLANT N N3W31M PATTON HOSPITAL 1N3W29M02 WHITTIER AVE 1S3W31A03 VICTORIA & BASELINE 1N3W32N01 NONE PROVIDED 1N3W34L01 SAN BERNARDINO AVE 1 1S3W23A03 SBVWCD N0. 1 1S2W07B01S SBVWCD N0. 3 1S3W12J01S SBVWCD N0. 4 1S3W11H01S PLANT N0. 6 1N4W36Q01 WELL N S3W29Q02 PLANT N N4W25A01 PLANT N N3W28P01 AIRPORT N0. 2 1S3W13M01 Year Depth to Water (Feet) Page A63

79 San Bernardino Valley Municipal Water District Change in Storage for the San Bernardino Basin Area CITY CREEK SUB-BASIN 'Shaded cells with no values represent no depth available; shaded cells with values represent interpolated depths Depth to Water (ft.) PLANT N0. 40 PLANT N0. 120A PLANT N PLANT N0. 94 DOMEST. WELL #6 32 ORANGE 5 1S3W04N 1S3W02J 1S3W02J 1N3W33F01S 1S3W17C 1S3W21H01S 1S3W15F02S Year Source Source Substitute Source Source Source Source Page A64

80 San Bernardino Valley Municipal Water District Change in Storage for the San Bernardino Basin Area CITY CREEK SUB-BASIN 'Shaded cells with no values represent no depth available; shaded cells with values represent interpolated depths Depth to Water (ft.) PLANT N0. 40 PLANT N0. 120A PLANT N PLANT N0. 94 DOMEST. WELL #6 32 ORANGE 5 1S3W04N 1S3W02J 1S3W02J 1N3W33F01S 1S3W17C 1S3W21H01S 1S3W15F02S Year Source Source Substitute Source Source Source Source Page A65

81 San Bernardino Valley Municipal Water District Change in Storage for the San Bernardino Basin Area CITY CREEK SUB-BASIN 'Shaded cells with no values represent no depth available; shaded cells with values represent interpolated depths Depth to Water (ft.) PLANT N0. 40 PLANT N0. 120A PLANT N PLANT N0. 94 DOMEST. WELL #6 32 ORANGE 5 1S3W04N 1S3W02J 1S3W02J 1N3W33F01S 1S3W17C 1S3W21H01S 1S3W15F02S Year Source Source Substitute Source Source Source Source Page A66

82 Year San Bernardino Valley Municipal Water District Change in Storage for the San Bernardino Basin Area CITY CREEK SUB-BASIN (Continued) 'Shaded cells with no values represent no depth available; shaded cells with values represent interpolated depths Depth to Water (ft.) PLANT N0. 14 GR REES N PLANT N0. 68 PATTON HOSPITAL WHITTIER AVE 1S4W01K04S 1S3W23A 1S3W28H01S 1N3W31M 1N3W29M02 1S3W31A03 Source Source Source Source Added Source Added Source Page A67

83 Year San Bernardino Valley Municipal Water District Change in Storage for the San Bernardino Basin Area CITY CREEK SUB-BASIN (Continued) 'Shaded cells with no values represent no depth available; shaded cells with values represent interpolated depths Depth to Water (ft.) PLANT N0. 14 GR REES N PLANT N0. 68 PATTON HOSPITAL WHITTIER AVE 1S4W01K04S 1S3W23A 1S3W28H01S 1N3W31M 1N3W29M02 1S3W31A03 Source Source Source Source Added Source Added Source Page A68

84 Year San Bernardino Valley Municipal Water District Change in Storage for the San Bernardino Basin Area CITY CREEK SUB-BASIN (Continued) 'Shaded cells with no values represent no depth available; shaded cells with values represent interpolated depths Depth to Water (ft.) PLANT N0. 14 GR REES N PLANT N0. 68 PATTON HOSPITAL WHITTIER AVE 1S4W01K04S 1S3W23A 1S3W28H01S 1N3W31M 1N3W29M02 1S3W31A03 Source Source Source Source Added Source Added Source Page A69

85 Year San Bernardino Valley Municipal Water District Change in Storage for the San Bernardino Basin Area CITY CREEK SUB-BASIN (Continued) Shaded cells with no values represent no depth available; shaded cells with values represent interpolated depths Depth to Water (Feet) VICTORIA & BASELINE NONE PROVIDED SAN BERNARDINO AVE 1 SBVWCD N0. 1 SBVWCD N0. 3 1N3W32N01 1N3W34L01 1S3W23A03 1S2W07B01S 1S3W12J01S Added Source Added Source Substitute Added Source Added Source Page A70

86 Year San Bernardino Valley Municipal Water District Change in Storage for the San Bernardino Basin Area CITY CREEK SUB-BASIN (Continued) Shaded cells with no values represent no depth available; shaded cells with values represent interpolated depths Depth to Water (Feet) VICTORIA & BASELINE NONE PROVIDED SAN BERNARDINO AVE 1 SBVWCD N0. 1 SBVWCD N0. 3 1N3W32N01 1N3W34L01 1S3W23A03 1S2W07B01S 1S3W12J01S Added Source Added Source Substitute Added Source Added Source Page A71

87 Year San Bernardino Valley Municipal Water District Change in Storage for the San Bernardino Basin Area CITY CREEK SUB-BASIN (Continued) Shaded cells with no values represent no depth available; shaded cells with values represent interpolated depths Depth to Water (Feet) VICTORIA & BASELINE NONE PROVIDED SAN BERNARDINO AVE 1 SBVWCD N0. 1 SBVWCD N0. 3 1N3W32N01 1N3W34L01 1S3W23A03 1S2W07B01S 1S3W12J01S Added Source Added Source Substitute Added Source Added Source Page A72

88 Year San Bernardino Valley Municipal Water District Change in Storage for the San Bernardino Basin Area CITY CREEK SUB-BASIN (Continued) Shaded cells with no values represent no depth available; shaded cells with values represent interpolated depths Depth to Water (Feet) SBVWCD N0. 4 PLANT N0. 6 WELL N0. 39 PLANT N0. 27 PLANT N0. 54 AIRPORT N0. 2 1S3W11H01S 1N4W36Q01 1S3W29Q02 1N4W25A01 1N3W28P01 1S3W13M01 Added Source Substitute Added Source Substitute Substitute Substitute Page A73

89 Year San Bernardino Valley Municipal Water District Change in Storage for the San Bernardino Basin Area CITY CREEK SUB-BASIN (Continued) Shaded cells with no values represent no depth available; shaded cells with values represent interpolated depths Depth to Water (Feet) SBVWCD N0. 4 PLANT N0. 6 WELL N0. 39 PLANT N0. 27 PLANT N0. 54 AIRPORT N0. 2 1S3W11H01S 1N4W36Q01 1S3W29Q02 1N4W25A01 1N3W28P01 1S3W13M01 Added Source Substitute Added Source Substitute Substitute Substitute Page A74

90 Year San Bernardino Valley Municipal Water District Change in Storage for the San Bernardino Basin Area CITY CREEK SUB-BASIN (Continued) Shaded cells with no values represent no depth available; shaded cells with values represent interpolated depths Depth to Water (Feet) SBVWCD N0. 4 PLANT N0. 6 WELL N0. 39 PLANT N0. 27 PLANT N0. 54 AIRPORT N0. 2 1S3W11H01S 1N4W36Q01 1S3W29Q02 1N4W25A01 1N3W28P01 1S3W13M01 Added Source Substitute Added Source Substitute Substitute Substitute Page A75

91 Page A76 I Marcum Well 2S3W05A2 LEE WELL 1S3W32J02S 1 1S3W33C01 Cypress Avenue Highland Avenue Miles Brookside Drive Cajon Street HIGHLAND/ROOSEVELT 1S3W35G05 10 Citrus Avenue ST 30 NO 17 1S3W35G11S Lugonia Avenue NO 37 1S3W26C Judson Street Redlands Sub-Basin San Bernardino Avenue JUDSON 1 1S3W24C MENTONE ACRES 1 1S3W24A01 Wabash Avenue Santa Ana River Well EAST PIONEER 1S3W13P SAN BERNARDINO AVE N0 1

92 30,000 20,000 10, ,000-20,000-30, Cumulative Change in Storage as compared to Base Year 1934 (acre-feet) SBVWD - GIS March 2010 Page A77 Cumulative Change in Storage for the Redlands Sub-Basin Years

93 25,000 20,000 15,000 10,000 5, ,000-10, Annual Change in Storage (acre-feet) SBVMW - GIS March 2010 Page A78 Annual Change in Storage for the Redlands Sub-Basin Years

94 San Bernardino Valley Municipal Water District Change In Storage for the Redlands Sub-basin (1) (2) (3) (4) Annual Cummulative Basin Change in Groundwater Change in Groundwater Index Storage Storage Year (ft.) (acre-feet) (acre-feet) n/a ,422 2, ,000 1, ,898 8, ,380 20, ,484 24, , ,330 25, ,543 22, ,658 23, , ,417 25, ,877 22, ,651 15, ,030 5, ,575 1, ,489-2, ,885-4, ,342-3, ,118-7, ,246-6, ,166-10, ,414-13, ,745-15, ,599-8, ,842-10, ,781-12, ,375-22, ,658-18, , ,892-22, , ,177-28, ,026-10, , ,801 16, , ,512 12, ,981 8, ,990 6, ,601 8, ,055 7, ,485 5, , Page A79

95 San Bernardino Valley Municipal Water District Change In Storage for the Redlands Sub-basin (1) (2) (3) (4) Annual Cummulative Basin Change in Groundwater Change in Groundwater Index Storage Storage Year (ft.) (acre-feet) (acre-feet) ,591-5, ,805-1, ,494 19, ,700 22, , ,455 27, ,791 24, ,131 20, ,586 14, ,988 10, ,303 7, , ,273-3, ,576-5, , ,337 3, ,189 9, ,913 17, ,416 14, ,057 13, ,457 17, ,407 18, ,279 12, ,040 11, ,120 5, ,001 3, ,104 1, ,150 5, , ,900 4, ,652-1, ,331-4,406 Page A80

96 Hydrograph for the Redlands Sub-Basin EAST PIONEER 1S3W13P LEE WELL 1S3W32J02S MARCUM 2S3W05A2 NO 17 1S3W35G11S NO 37 1S3W26C JUDSON 1 1S3W24C HIGHLAND/ROOSEVELT 1S3W35G05 Redlands 1 1S3W33C01 MENTONE ACRES 1 1S3W24A01 SAN BERNARDINO AVE 1 1S3W13R01S Depth to Water (Feet) Year Page A81

97 San Bernardino Valley Municipal Water District Change in Storage for the San Bernardino Basin Area REDLANDS SUB-BASIN Shaded cells with no values represent no depth available; shaded cells with values represent interpolated depths Depth to Water (Feet) EAST PIONEER LEE WELL MARCUM NO 17 NO 37 JUDSON 1 HIGHLAND/ROOSEVELT Redlands 1 1S3W13P 1S3W32J02S 2S3W05A2 1S3W35G11S 1S3W26C 1S3W24C 1S3W35G05 1S3W33C01 Year Source Source Source Source Source Source Added Source Added Source Page A82

98 San Bernardino Valley Municipal Water District Change in Storage for the San Bernardino Basin Area REDLANDS SUB-BASIN Shaded cells with no values represent no depth available; shaded cells with values represent interpolated depths Depth to Water (Feet) EAST PIONEER LEE WELL MARCUM NO 17 NO 37 JUDSON 1 HIGHLAND/ROOSEVELT Redlands 1 1S3W13P 1S3W32J02S 2S3W05A2 1S3W35G11S 1S3W26C 1S3W24C 1S3W35G05 1S3W33C01 Year Source Source Source Source Source Source Added Source Added Source Page A83

99 San Bernardino Valley Municipal Water District Change in Storage for the San Bernardino Basin Area REDLANDS SUB-BASIN Shaded cells with no values represent no depth available; shaded cells with values represent interpolated depths Depth to Water (Feet) MENTONE ACRES 1 SAN BERNARDINO AVE 1 1S3W24A01 1S3W13R01S Year Substitute Added Source Page A84

100 San Bernardino Valley Municipal Water District Change in Storage for the San Bernardino Basin Area REDLANDS SUB-BASIN Shaded cells with no values represent no depth available; shaded cells with values represent interpolated depths Depth to Water (Feet) MENTONE ACRES 1 SAN BERNARDINO AVE 1 1S3W24A01 1S3W13R01S Year Substitute Added Source Page A85

101 Page A86 10 Judson Street Citrus Avenue Colton Avenue San Bernardino Avenue Lugonia Avenue Wabash Avenue 5th Avenue Crafton Avenue!(!( AGATE WELL NO 1 1S2W19K01 Santa Ana River!(!( ST 38!(!( EAST LUGONIA NO 4 1S2W20B01 I Miles SBVWCD NO. 2 1S2W07K01 Mill Crk Monitor #5 1S2W17E!( CRAFTON AVE WELL 1S2W19J!( Observation Well 1S2W07R Mill Crk Monitor #2 1S2W17 EAST LUGONIA NO 6 1S2W21D01!( MAGUET 2 1S2W21E01S E. LUGONIA NO 2 1S2W22C02A!( Mill Creek Sub-Basin!( Well YVWD 51 1S2W24C01!( Bryant Street Mill Creek

102 Cumulative Change in Storage as compared to Base Year 1934 (acre-feet) Cumulative Change in Storage for the Mill Creek Sub-Basin 60,000 50,000 40,000 30,000 20,000 10, , SBVMWD - GIS March 2010 Page A87 Years

103 Annual Change in Storage (acre-feet) Annual Change in Storage for the Mill Creek Sub-Basin 40,000 30,000 20,000 10, ,000-20,000-30, SBVMWD - GIS March 2010 Page A88 Years

104 San Bernardino Valley Municipal Water District Change In Storage for the Mill Creek Sub-basin (1) (2) (3) (4) Annual Cummulative Basin Change in Groundwater Change in Groundwater Index Storage Storage Year (ft.) (acre-feet) (acre-feet) n/a ,575 5, ,081 14, ,472 36, ,506 34, ,705 25, ,412 23, ,081 30, ,883 28, , ,542 20, ,421 17, ,531 8, ,322 2, ,677 4, , ,890-1, ,151 1, ,447 18, ,629 4, ,664 9, ,947 2, ,394-2, ,767 4, ,574 16, ,797 27, ,220 5, ,592-4, , ,939-2, ,344-3, ,585 4, ,449 16, ,973 28, ,615 24, ,705 45, ,947 25, , ,184 13, ,794 21, , ,130 14, ,694 10, ,790 Page A89

105 San Bernardino Valley Municipal Water District Change In Storage for the Mill Creek Sub-basin (1) (2) (3) (4) Annual Cummulative Basin Change in Groundwater Change in Groundwater Index Storage Storage Year (ft.) (acre-feet) (acre-feet) ,652 48, ,001 47, ,546 51, ,993 33, ,958 36, ,723 45, ,284 30, ,232 32, ,445 31, ,482 27, ,148 29, ,125 16, ,796 14, ,593 21, ,338 32, ,767 50, ,468 38, ,390 48, ,923 36, ,248 55, ,957 47, ,059 24, ,656 18, ,243 23, ,565 17, ,681 16, ,811 19, ,567 48, ,042 36, ,835 17, ,498 24, ,048 Page A90

106 Hydrograph for the Mill Creek Sub-Basin Wells E. LUGONIA N0 2 1S2W22C02S CRAFTON AVE WELL 1S2W19J MAGUET 2 1S2W21E01S Agate Well N0 1 1S2W19K01 YVWD 51 1S2W24C01 E LUGONIA NO 4 1S2W20B01 E LUGONIA N0 6 1S2W21D01 OBSERVATION WELL 1S2W07R MC MONITOR #2 1S2W17L MK MONITOR #5 1S2W17E SBVWCD N0 2 1S2W07K01 Added Source Depth to Water (Feet) Year Page A91

107 San Bernardino Valley Municipal Water District Change in Storage for the San Bernardino Basin Area MILL CREEK SUB-BASIN Shaded cells with no values represent no depth available; shaded cells with values represent interpolated depths Depth to Water (ft.) E. LUGONIA N0 2 CRAFTON AVE WELL MAGUET 2 Agate Well N0 1 YVWD 51 E LUGONIA NO 4 1S2W22C02S 1S2W19J 1S2W21E01S 1S2W19K01 1S2W24C01 1S2W20B01 Year Source Source Source Added Source Substitute Added Source Page A92

108 San Bernardino Valley Municipal Water District Change in Storage for the San Bernardino Basin Area MILL CREEK SUB-BASIN Shaded cells with no values represent no depth available; shaded cells with values represent interpolated depths Depth to Water (ft.) E. LUGONIA N0 2 CRAFTON AVE WELL MAGUET 2 Agate Well N0 1 YVWD 51 E LUGONIA NO 4 1S2W22C02S 1S2W19J 1S2W21E01S 1S2W19K01 1S2W24C01 1S2W20B01 Year Source Source Source Added Source Substitute Added Source Page A93

109 San Bernardino Valley Municipal Water District Change in Storage for the San Bernardino Basin Area MILL CREEK SUB-BASIN Shaded cells with no values represent no depth available; shaded cells with values represent interpolated depths Depth to Water (ft.) E. LUGONIA N0 2 CRAFTON AVE WELL MAGUET 2 Agate Well N0 1 YVWD 51 E LUGONIA NO 4 1S2W22C02S 1S2W19J 1S2W21E01S 1S2W19K01 1S2W24C01 1S2W20B01 Year Source Source Source Added Source Substitute Added Source Page A94

110 San Bernardino Valley Municipal Water District Change in Storage for the San Bernardino Basin Area MILL CREEK SUB-BASIN Shaded cells with no values represent no depth available; shaded cells with values represent interpolated depths Depth to Water (ft.) E LUGONIA N0 6 SBVWCD N0 2 MC MONITOR #2 MK MONITOR #5 OBSERVATION WELL 1S2W21D01 1S2W07K01 1S2W17L 1S2W17E 1S2W07R Year Added Source Added Source Added Source Added Source Added Source Page A95

111 San Bernardino Valley Municipal Water District Change in Storage for the San Bernardino Basin Area MILL CREEK SUB-BASIN Shaded cells with no values represent no depth available; shaded cells with values represent interpolated depths Depth to Water (ft.) E LUGONIA N0 6 SBVWCD N0 2 MC MONITOR #2 MK MONITOR #5 OBSERVATION WELL 1S2W21D01 1S2W07K01 1S2W17L 1S2W17E 1S2W07R Year Added Source Added Source Added Source Added Source Added Source Page A96

112 San Bernardino Valley Municipal Water District Change in Storage for the San Bernardino Basin Area MILL CREEK SUB-BASIN Shaded cells with no values represent no depth available; shaded cells with values represent interpolated depths Depth to Water (ft.) E LUGONIA N0 6 SBVWCD N0 2 MC MONITOR #2 MK MONITOR #5 OBSERVATION WELL 1S2W21D01 1S2W07K01 1S2W17L 1S2W17E 1S2W07R Year Added Source Added Source Added Source Added Source Added Source Page A97

113 Page A98 I Sunset Drive Highland Avenue Elizabeth Street 13 1S3W35G S3W35H02 Redlands Boulevard 10 1S3W35G S3W35H04S 1S3W35G S3W35H Miles 10 Ford Street Citrus Avenue 5th Avenue Wabash Avenue Reservoir Sub-Basin Well Crafton Avenue

114 Cumulatve Change in Storage as compared to Base Year 1934 (acre-feet) 15,000 10,000 5, ,000-10,000-15,000-20, SBVMWD - GIS March 2010 Page A99 Cumulative Change in Storage for the Reservoir Sub-Basin Years

115 Annual Change in Storage (acre-feet) 8,000 6,000 4,000 2, ,000-4,000-6,000-8, SBVMWD - GIS March 2010 Page A100 Annual Change in Storage for the Reservoir Sub-Basin Years

116 San Bernardino Valley Municipal Water District Change In Storage for the Reservoir Sub-basin (1) (2) (3) (4) Annual Cummulative Basin Change in Groundwater Change in Groundwater Index Storage Storage Year (ft.) (acre-feet) (acre-feet) n/a ,686 2, , ,211 9, ,678 11, ,847 13, , ,679 14, ,679 12, , , , ,846 10, ,343 9, ,532 4, ,679 3, , ,378-5, ,182-3, ,175-4, ,518-7, ,846-8, ,358-12, ,007-13, ,532-8, ,510-10, ,015-12, ,860-16, ,868-11, , , ,511-10, , ,693-6, , ,511-4, ,685-1, ,175-2, ,343-1, , , ,021-1, ,014 Page A101

117 San Bernardino Valley Municipal Water District Change In Storage for the Reservoir Sub-basin (1) (2) (3) (4) Annual Cummulative Basin Change in Groundwater Change in Groundwater Index Storage Storage Year (ft.) (acre-feet) (acre-feet) , , ,022 3, ,510 5, ,015 7, ,510 8, , ,343 8, ,175 7, ,511 5, ,182 3, , ,847 1, ,189 4, ,511 5, ,847 7, ,342 8, ,511 10, ,007 11, , ,027 8, , , , ,598 8, , , , , , , ,785 Page A102

118 Hydrograph for the Reservoir Sub-Basin Wells 14 1S3W35H04S 13 1S3W35G S3W35H S3W35H S3W35G S3W35G07 Depth to Water (Feet) Year Page A103

119 San Bernardino Valley Municipal Water District Change in Storage for the San Bernardino Basin Area RESERVOIR SUB-BASIN Shaded cells with no values represent no depth available; shaded cells with values represent interpolated depths Depth to Water (ft.) S3W35H04S 1S3W35G09 1S3W35H03 1S3W35H02 1S3W35G08 1S3W35G07 Year Source Added Source Added Source Added Source Added Source Added Source Page A104

120 San Bernardino Valley Municipal Water District Change in Storage for the San Bernardino Basin Area RESERVOIR SUB-BASIN Shaded cells with no values represent no depth available; shaded cells with values represent interpolated depths Depth to Water (ft.) S3W35H04S 1S3W35G09 1S3W35H03 1S3W35H02 1S3W35G08 1S3W35G07 Year Source Added Source Added Source Added Source Added Source Added Source Page A105

121 San Bernardino Valley Municipal Water District Change in Storage for the San Bernardino Basin Area RESERVOIR SUB-BASIN Shaded cells with no values represent no depth available; shaded cells with values represent interpolated depths Depth to Water (ft.) S3W35H04S 1S3W35G09 1S3W35H03 1S3W35H02 1S3W35G08 1S3W35G07 Year Source Added Source Added Source Added Source Added Source Added Source Page A106

122 Page A107 I San Timoteo Canyon Road Highland Avenue 36 2S3W03K01 San Timoteo Creek Elizabeth Street Miles REDLANDS HGTS. 2S3W01D West Sunset Drive Live Oak Canyon Road 10 Divide Sub-Basin Well

123 25,000 20,000 15,000 10,000 5, ,000-10, Cumulative Change in Storage as compared to Base Year 1934 (acre-feet) SBVMWD - GIS March 2010 Page A108 Cumulative Change in Storage for the Divide Sub-Basin Years

124 Annual Change in Storage (acre-feet) 15,000 10,000 5, ,000-10,000-15, SBVMWD - GIS March 2010 Page A109 Annual Change in Storage for the Divide Sub-Basin Years

125 San Bernardino Valley Municipal Water District Change In Storage for the Divide Sub-basin (1) (2) (3) (4) Annual Cummulative Basin Change in Groundwater Change in Groundwater Index Storage Storage Year (ft.) (acre-feet) (acre-feet) n/a ,719 1, , ,304 8, ,675 11, ,101 13, ,292 10, ,012 14, ,394 10, ,292 12, , , , , ,630 7, , ,158 1, , ,248 4, ,203 9, ,011 13, ,585 8, ,584 4, , ,629 7, ,146 6, ,821 2, , ,585 6, , ,922-5, , , , , ,293 4, , , , ,146 3, , ,528 3, ,057 Page A110

126 San Bernardino Valley Municipal Water District Change In Storage for the Divide Sub-basin (1) (2) (3) (4) Annual Cummulative Basin Change in Groundwater Change in Groundwater Index Storage Storage Year (ft.) (acre-feet) (acre-feet) , , ,528 5, ,910 7, ,248 11, ,585 6, , , , , , ,146 4, , ,910 5, ,674 8, ,911 10, ,146 8, ,146 10, ,337 11, , ,142 21, , , , ,943 7, , ,467 6, , ,649 9, ,462 8, ,042 9, ,734 Page A111

127 Hydrograph for the Divide Sub-Basin Wells REDLANDS HGTS. 2S3W01D 36 2S3W03K01 Depth to Water (Feet) Year Page A112

128 San Bernardino Valley Municipal Water District Change in Storage for the San Bernardino Basin Area DIVIDE SUB-BASIN Shaded cells with no values represent no depth available; shaded cells with values represent interpolated depths Depth to Water (ft.) REDLANDS HGTS. 36 2S3W01D 2S3W03K01 Year Source Added Source Page A113

129 San Bernardino Valley Municipal Water District Change in Storage for the San Bernardino Basin Area DIVIDE SUB-BASIN Shaded cells with no values represent no depth available; shaded cells with values represent interpolated depths Depth to Water (ft.) REDLANDS HGTS. 36 2S3W01D 2S3W03K01 Year Source Added Source Page A114

130 APPENDIX: SBVMWD CHANGE IN STORAGE MODEL Appendix: SBVMWD Change in Storage Model Page M1

131 List of Figures No. Description Page B.1.1 Comparison of DWR FORTRAN Model, USGS MODFLOW Model and M6 SBVMWD GRID Model Results B.2.1 Illustration of the Specific Yield Method for calculating change in M8 groundwater storage B.3.1 Grid representation of a contour map. M10 B.3.2 Grid representation of Equation B.2.1. M11 B.4.1 Specific Yield Contour Map. M13 List of Tables No. Description Page B.1.1 Differences between DWR Model and SBVMWD Model M4 B.1.2 Quantity of Theissen Polygons ( Nodes ) for the Department of Water Resources Bulletin M5 Appendix: SBVMWD Change in Storage Model Page M2

132 A. INTRODUCTION The San Bernardino Valley Municipal Water District was incorporated on February 17, The District is one of 29 contractors of the California State Water Project (SWP) and has the fifth largest annual entitlement to SWP water at 102,600 acre-feet. The District takes delivery of SWP water through the Devil Canyon Powerhouse on the East Branch of the California State Aqueduct. The District serves a population of about 600,000 people within a 328 square mile area in the east San Bernardino Valley. Currently, there are over 33 miles of 12-inch to 78- inch diameter pipelines in the District's delivery system. The system includes 28 service connections to deliver both native and SWP water for direct delivery or groundwater recharge within the District's boundary. Groundwater recharge is conducted to lessen the impact of increasing well production from the various groundwater basins within the District's boundary and to help the District meet certain legal obligations. One of the legal obligations imposed on the District is the responsibility for maintaining the "safe yield" of the San Bernardino Basin Area. The safe yield is a theoretical maximum amount of water that may be removed from the basin on an annual basis without degrading the usable water supply. For the San Bernardino Basin Area, this amount has been set by the Western-San Bernardino Watermaster at 232,100 acre-feet/yr (Watermaster, pg. 24). One method of accounting for groundwater that enters or leaves the San Bernardino Basin Area is to estimate the change in groundwater volume, or storage, using a network of observation wells. The change in groundwater elevation for these observation wells along with the given soil characteristics can be used to approximate the change in groundwater storage. Appendix: SBVMWD Change in Storage Model Page M3

133 B. THE SBVMWD CHANGE IN STORAGE MODEL B.1 Background The San Bernardino Valley Municipal Water District (SBVMWD) has been calculating the change in groundwater storage for the San Bernardino Basin area since The first calculation was completed for the years by the State of California Department of Water Resources (DWR) and the results were summarized in Bulletin 104-5, Meeting Water Demands in the Bunker Hill-San Timoteo Area, Geology, Hydrology, and Operation-Economics Studies, Text and Plates (Olson, pp ). The DWR change in storage values were calculated using the Specific Yield Method (Olson, pp ) and a mathematical model developed by TRW, Incorporated, Redondo Beach, California (TRW). In 1980, SBVMWD updated the change in storage calculation to include the years (Van Gelder). In the early 1990 s, SBVMWD created a new change in storage model using GRID software developed by Environmental Systems Research Institute (ESRI), Redlands, California. GRID was selected because it allowed a finer model resolution and because it was able to interpolate surfaces or create contour maps from a spatial distribution of data points. The differences between the two models are summarized in Table B.1.1. Table B.1.1. Differences between DWR model and SBVMWD Model. Item DWR Model SBVMWD Model Method of Analysis Specific Yield Method Specific Yield Method Sub-basin boundaries DWR Bulletin No DWR Bulletin No Wells (quantity) 75 See main report Water Levels Constant across nodes Interpolated from given data Specific Yield DWR Bulletin No. 45 DWR Bulletin No. 45 Computer Software FORTRAN IV ESRI GRID Software Model resolution (cell size) 75 nodes (cells): Smallest cell= 589 acres Largest cell = 1,778 acres 335,758 cells: Uniform cell size: 100 ft. square (.23 acre) Although the two models use different computer programs and a different quantity of wells (many of the wells used in the original study have since been abandoned) to calculate the Appendix: SBVMWD Change in Storage Model Page M4

134 Cumulative Change in Storage (acre-feet) change in groundwater storage, the results obtained from the two models are similar (see Figure B.1.1). The difference in the results can be mostly attributed to the improved capabilities of the SBVMWD model. 200,000 - (200,000) (400,000) (600,000) (800,000) (1,000,000) (1,200,000) (1,400,000) Figure B.1.1. Comparison of DWR FORTRAN Model, USGS MODFLOW Model and SBVMWD GRID Model Results USGS (1994) DWR (1981) SBVMWD (2000) SBVMWD (1994) USGS (3/2001) Year Appendix: SBVMWD Change in Storage Model Page M5

135 Geologists divided the DWR model for the San Bernardino Basin Area into 75 polygons (see Table B.1.2), or nodes, using the Theissen method of polygon construction. The nodes were drawn to surround an area where the soil characteristics, specific yield, and groundwater surface could be assumed constant. The change in storage was computed for each individual node using the Specific Yield Method. The sum of the change in storage for all of the nodes was the change in storage for the San Bernardino Basin area. Table B.1.2. Quantity of Theissen Polygons ( Nodes ) for the Department of Water Resources Bulletin Area No. Designation No. of Nodes 1 Cajon 8 2 Devil Canyon 4 3 Lytle Creek 10 4 Pressure Zone 16 5 City Creek 19 6 Redlands 5 7 Mill Creek 8 8 Reservoir 3 9 Divide 2 TOTALS 75 The surface area of the smallest node was 589 acres and the surface area of the largest node was 1,778 acres. The large node, or model cell size, provides one of the largest differences between the SBVMWD model and the DWR model. The SBVMWD model has been divided into a uniform, square cell size of 100 feet per side (0.23 acre). This smaller cell size of the SBVMWD model allows values to be more accurately assigned to each model cell based upon the given contour maps instead of assuming constant values across large areas like the DWR model. For example, each model uses storage coefficients from DWR s Bulletin No. 45 (Eckis). The specific yield data from Bulletin No. 45 is presented on a contour map (Eckis, Plate E). The SBVMWD model is able to convert this contour map into a grid which contains a unique specific yield value for each Appendix: SBVMWD Change in Storage Model Page M6

136 of its 335,758 model cells. In contrast, the DWR model must assume a single, constant specific yield across each of its 75 larger nodes. The larger number of model cells in the SBVMWD model allows it to use a more accurate representation of the specific yield contour map in the change in groundwater storage calculation. In addition to providing a more accurate representation of the specific yield contour map, the SBVMWD model also provides a more accurate representation of the water levels within each sub-basin. The DWR model assumes a constant water level across each of its 75 nodes. This constant groundwater surface across each node causes the DWR model to produce a groundwater surface with a stair step appearance. The finer resolution and ability of the SBVMWD model to interpolate a groundwater surface within each sub-basin from the given well data. This produces a water level surface that is more representative of the true surface than the stair step surface generated by the DWR model. In conclusion, the DWR model and SBVMWD model produce similar results. The difference between the two models is most likely due to the finer model resolution and the interpolation capabilities of the newer SBVMWD model. B.2 Method of Analysis The San Bernardino Valley Municipal Water District (SBVMWD) Change in Storage (CIS) model calculates the cumulative change in storage (CCIS) using a spatial distribution of available wells and the Specific Yield Method, as put forth in the Department of Water Resources' Bulletin (Olson, pg. 85). This method calculates the change in storage based upon an adaptation of the simple mathematical equation for calculating volume, (length * width * height). CCIS = (h present year - h base year )SA (Equation B.2.1) where, CCIS = Cumulative change in storage, acre-feet (h present year - h base year ) = Change in saturated thickness, ft. h present year = Depth to groundwater, present year h base year = Depth to groundwater, base year (1934) S = Specific Yield, dimensionless A = Area, acres Appendix: SBVMWD Change in Storage Model Page M7

137 In Equation B.2.1, length * width is given by the surface area, A, of the basin and height is given by, (h present year - h base year ), the change in saturated thickness. The specific yield simply adjusts the volume calculation to account for the fact that only the pore space in the soil is available for water storage. Figure B.2.1 illustrates the Specific Yield Method. Given the cumulative change in storage values for a series of years, these cumulative values can be used to calculate the annual change in groundwater storage. The annual change in groundwater storage is simply the difference between a year s cumulative change in storage and the previous year s cumulative change in storage (Equation B.2.2). ACIS present year = CCIS present year - CCIS previous year (Equation B.2.2) where, ACIS = Annual Change in Storage for the present year, acre-feet CCIS present year = Cumulative Change in Storage for the present year, acre-feet CCIS previous year = Cumulative Change in Storage for the previous year, acre-feet Well Sub-basin Boundary Change in Saturated thickness Water Surfaces (base year and current year) Figure B.2.1. Illustration of the Specific Yield Method for calculating the change in groundwater storage (Equation B.2.1). Appendix: SBVMWD Change in Storage Model Page M8