Nevada Irrigation District WATER DEMAND WATER CONSERVATION SURFACE WATER AGRICULTURE

Transcription

1 Nevada Irrigation District WATER DEMAND WATER CONSERVATION SURFACE WATER AGRICULTURE June 2011

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3 10540 White Rock Road, Suite 180 Rancho Cordova, California Tel: Fax: June 24, 2011 Mr. Vern Smith Supervising Engineer Nevada Irrigation District 1036 W. Main Street Grass Valley, California Subject: 2010 Urban Water Management Plan Dear Mr. Smith: We are pleased to submit to you the 2010 Urban Water Management Plan (UWMP) for the Nevada Irrigation District (NID). This UWMP was adopted by your Board of Directors. A Board resolution of adoption is included in the UWMP. We have updated your 2005 UWMP to incorporate more recent data and information as well as new requirements in the law and from the California Department of Water Resources (DWR). Please let me know if you have any questions. Very truly yours, Brown and Caldwell, a California Corporation Christina Brown, P.E. Project Manager Melanie Holton, P.E. Project Engineer MH/CB:ds Enclosure (1): Urban Water Management Plan for the Nevada Irrigation District \\Bcsac01\projects\39000\ NID 2010 UWMP\04_Deliverables\4_1_Reports\2 Final\Final to DWR\UWMP Cvr Ltr _to NID.docx

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5 Nevada Irrigation District 2010 Urban Water Management Plan Prepared for Nevada Irrigation District, June 24, White Rock Road, Suite 180 Rancho Cordova, California 95670

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7 Table of Contents 1. Introduction Urban Water Management Planning Act Public Participation and Plan Adoption Agency Coordination Plan Implementation Plan Organization Description of Existing Water System Description of Service Area Local Climate Water Supply Facilities Historical and Projected Population Historical and Projected Water Use Historical Water Use GPCD Baseline and Targets Projected Water Demands Projected Normal-Year Water Demands Water Demands for Lower Income Households Water Supplies Surface Water Description Physical Constraints Legal Constraints Groundwater Transfer and Exchange Opportunities Desalinated Water Opportunities Water Quality Current and Projected Normal Year Water Supplies Resource Maximization and Import Minimization Water Supply Reliability Future Water Projects Recycled Water Recycled Water Plan Coordination Wastewater Quantity, Quality, and Current Uses Wastewater Generation Wastewater Collection and Treatment Current Uses of Recycled Water Potential and Projected Use of Reclaimed Water ii \\Bcsac01\projects\39000\ NID 2010 UWMP\04_Deliverables\4_1_Reports\2 Final\Final to DWR\Nevada Irrigation District 2010 UWMP docx

8 2010 Urban Water Management Plan Table of Contents Potential Use of Reclaimed Water Projected Future Use of Reclaimed Water Optimizing the Use of Reclaimed Water Water Conservation Best Management Practices Current Water Conservation Program Economic Analysis Results Additional Issues Additional Conservation Programs Water Use Reduction Plan Water Supply versus Demand Comparison Current and Projected Water Supplies vs. Demand Current and Projected Normal Year Water Supplies vs. Demand Current and Projected Single Dry Year Water Supplies vs. Demand Projected Multiple-Dry Year Water Supplies vs. Demand Water Shortage Expectations Water Shortage Contingency Plan Stages of Action Three-Year Minimum Water Supply Catastrophic Supply Interruption Plan Prohibitions, Consumption Reduction Methods, and Penalties Analysis of Revenue Impacts of Reduced Sales During Shortages Reduction Measuring Mechanisms References Appendix A: Documentation of City/County Notification... A Appendix B: Notice of Public Hearing... B Appendix C: Adoption Resolution... C Appendix D: DWR UWMP Checklist... D Appendix E: SBX7-7 GPCD Target Analysis...E Appendix F: Census Block Tracks within NID Boundaries... F Appendix G: Drought Contingency Plan... G Appendix H: Water Conservation Evaluation... H Appendix I: NID Rate Structures... I Appendix J: NID Water Conservation Educational Materials... J Appendix K: NID Water Regulations... K Appendix L: NID Water Shortage Financial Analysis... L iii \\Bcsac01\projects\39000\ NID 2010 UWMP\04_Deliverables\4_1_Reports\2 Final\Final to DWR\Nevada Irrigation District 2010 UWMP docx

9 2010 Urban Water Management Plan Table of Contents List of Figures Figure 2-1. Nevada Irrigation District and Neighboring Utilities Figure 2-2. NID Water Systems Figure 2-3. NID Retail Service Area with Census Block Groups Figure 2-4. Historical Population and Number of Connections Figure 2-5. Historical and Projected Population Figure 3 1. Historical and Projected Retail Water Demand Figure 4-1. NID Historic Watershed Runoff Figure 4-2. NID Historic Reservoir Carryover Storage List of Tables Table 1-1. (DWR Table 1) Coordination with Appropriate Agencies Table 2-1. NID Service Area Climate Characteristics Table 2-2. NID Water Treatment Plants Table 2-3. Historical Population Table 2-4. (DWR Table 2) Projected Population Table 3-1. Historical Retail Treated Water Production Table 3-2. (DWR Table 13) Zone 41 Retail Base Period Ranges Table 3-3. (DWR Table 14) Zone 41 Retail Base Daily per Capita Water Use to 15-year range Table 3-4. (DWR Table 15) Base Daily per Capita Water Use - 5-year range Table 3-5. (DWR Table 3) Water System Projected Water Demands and Number of Accounts, Actual Table 3-6. (DWR Table 4) Water System Projected Water Demands and Number of Accounts, Actual Table 3-7. (DWR Table 5) Water System Projected Water Demands and Number of Accounts, Projected Table 3-8. (DWR Table 6) Water System Projected Water Demands and Number of Accounts, Projected Table 3-9. (DWR Table 7) Water System Projected Water Demands and Number of Accounts, Table (DWR Table 9) Sales to Other Water Agencies, ac-ft/yr Table (DWR Table 10) Additional Water Uses and Losses, ac-ft/yr Table (DWR Table 11) Total Water Use, ac-ft/yr Table (DWR Table 8) Low-Income Projected Water Demands, ac-ft/yr iv \\Bcsac01\projects\39000\ NID 2010 UWMP\04_Deliverables\4_1_Reports\2 Final\Final to DWR\Nevada Irrigation District 2010 UWMP docx

10 2010 Urban Water Management Plan Table of Contents Table 4-1. NID Water Supply Reservoirs Table 4-2. (DWR Table 20) Transfer and Exchange Opportunities Table 4-3. (DWR Table 30) Current and Projected Water Supply Impacts Due to Water Quality, ac-ft/yr Table 4-4. (DWR Table 16) Current and Projected Normal Year Water Supplies, ac-ft/yr Table 4-5. (DWR Table 12) Retail Agency Demand Projections Provided to Wholesalers, ac-ft/yr Table 4-6. (DWR Table 17) Wholesale Supplies Existing and Planned Sources of Water, ac-ft/yr Table 4-7. (DWR Table 29) Factors Resulting in Inconsistency of Supply Table 4-8. (DWR Table 27) Basis of Water Year Data Table 4-9. (DWR Table 28) Supply Reliability Historic Conditions Watershed Runoff (a) Table (DWR Table 31) Water Supply Reliability Current Water Sources, ac-ft/yr Table (DWR Table 26) Future Water Supply Projects Table 5-1. (DWR Table 21) Wastewater Collected and Treated, ac-ft/yr Table 5-2. (DWR Table 22) Disposal of Wastewater, ac-ft/yr Table 5-3. Existing Recycled Water Uses Table 5-4. (DWR Table 23)Potential Recycled Water Uses, ac-ft/yr Table 5-5. Projected Future Use of Recycled Water, ac-ft/yr Table 5-6. (DWR Table 24) Recycled Water Uses 2005 UWMP Use Compared to 2010 Actual, ac-ft/yr Table 5-7. (DWR Table 25) Methods to Encourage Recycled Water Uses Table 6-1. Water Conservation Demand Management Measures Table 6-2. Actual Conservation Activities and Water Savings, DMM 1. Water survey programs for single-family residential and multi-family residential connections Table 6-3. Projected Conservation Activities and Water Savings, DMM 1. Water survey programs for single-family residential and multi-family residential connections Table 6-4. Actual Conservation Activities and Water Savings, DMM 3. System Water Audits, Leak Detection, and Repair Table 6-5. Projected Conservation Activities and Water Savings, DMM 3. System Water Audits, Leak Detection, and Repair Table 6-6. Large Meter Testing Table 6-7. Actual Conservation Activities, and Water Savings, DMM 5. Large Landscape Conservation Programs Table 6-8. Projected Conservation Activities, and Water Savings, DMM 5. Large Landscape Conservation Programs Table 6-9. Actual Conservation Activities, DMM 7. Public Information Programs Table Projected Conservation Activities, DMM 7. Public Information Programs Table Actual Conservation Activities, DMM 8. School Education Programs Table Projected Conservation Activities, DMM 8. School Education Programs v \\Bcsac01\projects\39000\ NID 2010 UWMP\04_Deliverables\4_1_Reports\2 Final\Final to DWR\Nevada Irrigation District 2010 UWMP docx

11 2010 Urban Water Management Plan Table of Contents Table Actual Conservation Activities, DMM 10. Wholesale Agency Programs Table Projected Conservation Activities, DMM 10. Wholesale Agency Programs Table Description of NID Rate Structures, DMM 11. Conservation Pricing Table Actual Conservation Activities, DMM 12. Water Conservation Coordinator Table Projected Conservation Activities, DMM 12. Water Conservation Coordinator Table Actual Conservation Activities, DMM 13. Water Waste Prohibition Table Projected Conservation Activities, DMM 13. Water Waste Prohibition Table Results of Economic Analysis for DMMs not Implemented by NID Table 7-1. (DWR Table 32) Normal Year Water Supply and Demand Comparison, ac-ft/yr Table 7-2. (DWR Table 33) Single Dry Year Water Supply and Demand Comparison, ac-ft/yr Table 7-3. (DWR Table 34) Multiple-Dry Year Events Water Supply and Demand Comparison, ac-ft/yr Table 8-1. (DWR Table 35) Water Shortage Contingency Rationing Stages to Address Water Supply Shortages Table 8-2. (DWR Table 36) Water Shortage Contingency Mandatory Prohibitions Table 8-3. (DWR Table 37) Water Shortage Contingency Consumption Reduction Methods Table 8-4. (DWR Table 38) Water Shortage Contingency Penalties and Charges Table 8-6. Reduction Measuring Mechanisms vi \\Bcsac01\projects\39000\ NID 2010 UWMP\04_Deliverables\4_1_Reports\2 Final\Final to DWR\Nevada Irrigation District 2010 UWMP docx

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13 2010 Urban Water Management Plan Table of Contents List of Abbreviations F degrees Fahrenheit ac-ft ac-ft/yr Act AWWA B/C BMPs CABY CDPH CII CIMIS CUWCC DOF DMMs DWR acre-feet acre-feet per year Urban Water Management Act American Water Works Association benefit/cost Best Management Practices Cosumnes American Bear Yuba California Department of Public Health commercial, industrial, and institutional California Irrigation Management Information System California Urban Water Conservation Council Department of Finance Demand Management Measures Department of Water Resources NID PCWA PG&E Plan psi RWMP TAF UAW ULFTs USEPA WRCC WTP WWTP Nevada Irrigation District Placer County Water Agency Pacific Gas and Electric Company Urban Water Management Plan pounds per square inch Raw Water Master Plan thousand acre feet unaccounted-for water ultra low flush toilets United Stated Environmental Protection Agency Western Regional Climate Center water treatment plant wastewater treatment plant ETo evapotranspiration ft feet/foot GPCD gpd gallons per capita per day gallons per day HCF hundred cubic feet ICC ICE IRWMP kw Incident Command Center Irrigation Consultation and Evaluation Integrated Regional Water Management Plan kilowatt MCLs MG MOU Maximum Contaminant Levels million gallons Memorandum of Understanding vii \\Bcsac01\projects\39000\ NID 2010 UWMP\04_Deliverables\4_1_Reports\2 Final\Final to DWR\Nevada Irrigation District 2010 UWMP docx

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15 Section 1 Introduction This Urban Water Management Plan (Plan) was prepared for the Nevada Irrigation District (NID) in cooperation with the NID staff. This Plan addresses NID s water system and includes a description of the water supply sources, magnitudes of historical and projected water use, and a comparison of water supply water demands during normal, single dry, and multiple-dry years. Also described is NID s water conservation program. NID was organized in 1921 under the California Irrigation District Act of 1897 as a nonprofit water agency, and operates under Division 11 of the State Water Code. This Plan is the year 2010 Urban Water Management Plan as required by the Urban Water Management Planning Act (Act) (California Water Code Division 6, Part 2.6, Sections through 10657). The remainder of this section provides an overview of the Urban Water Management Planning Act, public participation, agency coordination, plan implementation and organization. In order to aid the reader in understanding the context of the Plan content, at the beginning of some sections and subsections in this Plan is italicized text quoting specific portions of the Act that are relevant to the particular Plan sections. 1.1 Urban Water Management Planning Act One of the purposes of this Plan is to ensure the efficient use of available water supplies, as required by the Act. The Act became part of the California Water Code with the passage of Assembly Bill 797 during the regular session of the California legislature. Subsequently, assembly bills between 1990 and 2003 amended the Act. The Act was most recently amended in November 2009 with the adoption of SB7. The most significant revision is the requirement for establishing per capita water use targets and an option to delay Plan adoption to July 1, The Act requires every urban water supplier providing water for municipal purposes to more than 3,000 customers or supplying more than 3,000 acre-feet of water annually to adopt and submit an urban water management plan every five years to the California Department of Water Resources (DWR). According to DWR, the Act states that these urban water suppliers should make every effort to assure the appropriate level of reliability in its water service is sufficient to meet the needs of its various categories of customers during normal, dry, and multiple dry years. The Act describes the contents of the Plan as well as how urban water suppliers should adopt and implement the Plan. 1.2 Public Participation and Plan Adoption 10621(b) Every urban water supplier required to prepare a plan pursuant to this part shall, at least 60 days prior to the public hearing on the plan required by Section 10642, notify any city or county within which the supplier provides water supplies that urban water supplier will be reviewing the plan and considering amendments or changes to the plan. The urban water supplier may consult with, and obtain comments from, any city or county that receives notice pursuant to this subdivision (b) The urban water supplier shall provide that portion of its urban water management plan prepared pursuant to this article to any city or county within which is provides water supplies no later than 60 days after the submission of its urban water management plan. 1-1 \\Bcsac01\projects\39000\ NID 2010 UWMP\04_Deliverables\4_1_Reports\2 Final\Final to DWR\Nevada Irrigation District 2010 UWMP docx

16 2010 Urban Water Management Plan Section Prior to adopting a plan, the urban water supplier shall make the plan available for public inspection and shall hold a public hearing thereon. Prior to the hearing, notice of the time and place of the hearing shall be published within the jurisdiction of the publicly owned water supplier pursuant to Section 6066 of the Government Code. The urban water supplier shall provide notice of the time and place of hearing to any city or county within which the supplier provides water supplies. A privately owned water supplier shall provide an equivalent notice within its own service area. The Act requires the encouragement of public participation and a public hearing as part of the Urban Water Management Plan development and approval process. As required by the Act, prior to adopting this Plan, NID made the Plan available for public inspection and held a public hearing. NID notified cities and counties within the service area 60 days before the public hearing. Appendix A provides documentation that the city and counties within which NID provides water supplies was notified at least 60 days prior to the UWMP public hearing. This hearing provided an opportunity for NID s customers including social, cultural, and economic community groups to learn about the water supply situation and the plans for providing a reliable, safe, high-quality water supply for the future. The hearing was an opportunity for people to ask questions regarding the current situation and the viability of future plans. Per the requirements of Government Code Section 6066 a Notice of Public Hearing was published twice in the Nevada Union to notify all customers and local governments of the public hearing and copies of the draft Plan were made available for public inspection at NID s Administration Building, at local public libraries, and on the NID website, A copy of the published Notice of Public Hearing is included in Appendix B. This Plan was adopted by NID s Board of Directors on June 8, A copy of the adopted resolution is provided in Appendix C. The adopted plan will be provided to DWR and the appropriate cities and counties within 30 days of adoption. The adopted UWMP will also be available for public review during normal business hours at the NID administrative building. 1.3 Agency Coordination 10620(d)(2) Each urban water supplier shall coordinate the preparation of its plan with other appropriate agencies in the area, including other water suppliers that share a common source, water management agencies, and relevant public agencies to the extent practicable Each urban water suppler shall encourage the active involvement of diverse social, cultural, and economic elements of the population within the service area prior to and during the preparation of its plan. The Act requires NID to coordinate the preparation of its plan with other appropriate agencies in the area, including other water suppliers that share a common source, water management agencies, and relevant public agencies, to the extent practicable. NID sent a copy of this Plan to the agencies listed in Table 1-1. Table 1-1 provides a summary of the plan coordination with the appropriate agencies. 1-2 \\Bcsac01\projects\39000\ NID 2010 UWMP\04_Deliverables\4_1_Reports\2 Final\Final to DWR\Nevada Irrigation District 2010 UWMP docx

17 2010 Urban Water Management Plan Section 1 Table 1-1. (DWR Table 1) Coordination with Appropriate Agencies Coordinating Agencies Was notified 60 days prior to Plan adoption Participated in developing the Plan Commented on the draft Attended public meetings Was contacted for assistance Was sent a copy of the draft Plan Was sent a notice of intention to adopt Not Involved / No Information Nevada County X X X Placer County X X X X Yuba County X X X Nevada County Local Agency Formation Commission X X X City of Auburn X X X X City of Grass Valley X X X X City of Nevada City X X X X City of Lincoln X X X Placer County Water Agency X X X Placer Nevada Wastewater Authority X X Pacific Gas and Electric X X General public X X X California Department of Health Services X X State Water Resources Control Board X X Regional Water Quality Control Board X X California Department of Water Resources X X California Department of Fish and Game X 1-3 \\Bcsac01\projects\39000\ NID 2010 UWMP\04_Deliverables\4_1_Reports\2 Final\Final to DWR\Nevada Irrigation District 2010 UWMP docx

18 2010 Urban Water Management Plan Section Plan Implementation An urban water supplier shall implement its plan adopted pursuant to this chapter in accordance with the schedule set forth in its plan. This 2010 Plan updates the water conservation implementation plan and projected schedules in the 2005 Plan. The Plan describes the availability of water and discusses water use, reclamation, and water conservation activities. The Plan concludes that the water supplies available to NID s treated water customers are adequate over the next 25-year planning period through This 2010 UWMP will be implemented so that the projected water conservation activities are fulfilled. In addition, NID will work to meet the gallons per capita per day (GPCD) interim and final targets set forth in this Plan. Actual recycled water use will also be tracked and compared to the projected use in this Plan. NID implemented the 2005 UWMP in close accordance with the information that was projected in that plan. 1.5 Plan Organization This section provides a summary of the sections in this Plan. Section 2 provides a description of the service area, climate, water supply facilities, distribution system, and historical and projected population. Section 3 presents historical and projected water use. Section 4 describes the water supplies. Section 5 describes recycled water. Section 6 addresses water conservation. Section 7 provides a comparison of future water supply to demand. Section 8 describes NID s water shortage contingency plan. Section 9 provides a list of references. Appendices A through L provide relevant supporting documents. DWR has provided a checklist of the items that must be addressed in each Plan based upon the Act. This checklist makes it simple to identify exactly where in the Plan each item has been addressed. The checklist is completed for this Plan and provided in Appendix D. It references the sections and page numbers where specific items can be found. 1-4 \\Bcsac01\projects\39000\ NID 2010 UWMP\04_Deliverables\4_1_Reports\2 Final\Final to DWR\Nevada Irrigation District 2010 UWMP docx

19 Section 2 Description of Existing Water System This section describes NID s system. It contains a description of the service area and its climate, and the water supply facilities, including surface water supply facilities, booster pumping stations, reservoirs, and the piping system. 2.1 Description of Service Area 10631(a) Describe the service area of the supplier. Located on the western slope of the Sierra Nevada Mountain Range, NID encompasses 287,000 acres and covers portions of three counties: Nevada, Placer, and Yuba. Defined as a special district operated by and for the people who own land within its 287,000 acre boundary, NID was established as an irrigation district in NID also supplies water for municipal, domestic, and industrial purposes. 66,500 acres of the NID service area is within Placer County, generally the area between Auburn and Lincoln to the north. In Lincoln, NID is responsible for water service to outlying areas and to some sections of Lincoln where the City of Lincoln and NID boundaries overlap. Municipal customers include Grass Valley, Nevada City, and a portion of Lincoln. A small portion of treated water production is delivered through master meters to select areas under jurisdiction of other municipalities. The water is then resold for both commercial and non-commercial use. NID s retail potable water system consists of seven service areas as listed below. The retail water system connections are predominantly single-family, but also consist of multi-family, commercial, industrial, and institutional customers. Loma Rica E. George Lake Wildwood North Auburn Lake of the Pines Cascade Shores Smartville Figure 2-1 illustrates the location of NID and the neighboring water agencies. The service areas within NID are shown on Figure Local Climate 10631(a) (Describe the service area) climate. Ground elevations within NID s boundaries range from approximately 3,900 feet on Banner Mountain above Nevada City at the eastern edge of NID, down to about 200 feet (ft) near the City of Lincoln. Summers are generally dry with mild to hot temperatures. Winters are relatively wet, especially in the upper elevations around Nevada City and Grass Valley, with snow levels usually around 3,500 ft and occasionally as low as 1,000 ft. Based on the historical data obtained from the California Irrigation Management Information System (CIMIS) and the Western Regional Climate Center (WRCC), NID s service area average minimum and maximum monthly temperature ranges from 28 to 87 degrees Fahrenheit. Table 2-1 summarizes NID s climate conditions based on the CIMIS and WRCC databases. 2-1 \\Bcsac01\projects\39000\ NID 2010 UWMP\04_Deliverables\4_1_Reports\2 Final\Final to DWR\Nevada Irrigation District 2010 UWMP docx

20 2010 Urban Water Management Plan Section 2 Location Elevation, ft Auburn (CIMIS Station no.195) Table 2-1. NID Service Area Climate Characteristics Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec Total Standard average ETo, in Total rainfall, in Maximum temperature, F Minimum temperature, F Grass Valley (WRCC Station No ) 2,400 Standard average ETo, in NA Average Maximum temperature, F Average Minimum temperature, F Total rainfall, in Average total snowfall, in Period of Record : 10/1/1966 to 4/30/2010 Nevada City (WRCC Station No ) 2,780 Standard average ETo, in NA Average Maximum temperature, F Average Minimum temperature, F Total rainfall, in Average total snowfall, in Period of Record : 2/ 1/1893 to 4/30/2010 Bowman Dam (WRCC Station No ) 5,390 Standard average ETo, in NA Average Maximum temperature, F Average Minimum temperature, F Total rainfall, in Average total snowfall, in Period of Record : 6/ 1/1896 to 4/30/2010 NA = not available ETo = evapotranspiration o F = degrees Fahrenheit CIMIS = California Irrigation Management and Information System WRCC = Western Regional Climate Center 2-2

21 BUTTE WATER DISTRICT THERMALITO IRRIGATION DISTRICT Butte Legend County Line CALIFORNIA WATER SERVICE CO. OROVILLE WYANDOTTE I.D. YUBA COUNTY WATER AGENCY Nevada Sierra Miles WASHINGTON W.D. RECLAMATION DISTRICT NO. 10 CITY OF MARYSVILLE W.S.A. RAMIREZ WATER DISTRICT CORDUA IRRIGATION DISTRICT HALLWOOD IRRIGATION COMPANY DANTONI AREA LINDA COUNTY W.D. BROPHY WATER DISTRICT BROWNS VALLEY I.D. RAILROAD COMMISSION LAND Yuba CITY OF GRASS VALLEY W.S.A. NEVADA IRRIGATION DISTRICT FEATHER W.D. SUTTER BUTTE M.W.C. RECLAMATION DISTRICT NO. 784 OLIVEHURST P.U.D. PLUMAS MUTUAL WATER COMPANY Sutter PLEASANT GROVE-VERONA M.W.C. Yolo SOUTH YUBA WATER DISTRICT NATOMAS CENTRAL M.W.D. SOUTH SUTTER W.D. PROJECT DATE WHEATLAND WATER DISTRICT CAMP FAR WEST I.D. WESTERN PLACER I.D CITY OF ROSEVILLE W.S.A. PROJECT TITLE PLACER CO WATER AGENCY SAN JUAN W.D. CHRISTIAN VALLEY PARK C.S.D. MIDWAY HEIGHTS C.W.D. El Dorado Urban Water Management Plan FORESTHILL P.U.D. GEORGETOWN DIVIDE P.U.D Location of NID and Neighboring Water Utilities EL DORADO I.D. Placer Figure 2-1 FILE: P:\39000\ NID 2010 UWMP\03_Engineering\3_2_GIS-CAD\GIS\Figure 2-1 Location Map.mxd

22 Yuba County Nevada County Placer County Miles PROJECT # DATE PROJECT TITLE El Dorado County Urban Water Management Plan NID Water Systems Legend NID Water Systems Cascase Shores E. George Loma Rica Lake Wildwood Lake of the Pines North Auburn Smartville NID Service Area Railroad Commission Land County Line Figure 2-2 FILE: P:\39000\ NID 2010 UWMP\03_Engineering\3_2_GIS-CAD\GIS\Figure 2-2 NID Service Area.mxd

23 2010 Urban Water Management Plan Section Water Supply Facilities Water supply for NID is currently derived from mountain snowpack from Northern California s Sierra Nevada Mountains, and is stored in an extensive system of ten reservoirs that provide water surface water supply to NID s seven water treatment plants as well as the raw water supply for NID s raw water system. This section describes the surface water facilities. NID began treating water in the late 1950s by injecting gaseous chlorine into open canals at the head of irrigation pipes serving isolated pockets of the area s population. The first conventional water treatment plant (WTP) was built in 1963 at the Forest Knolls subdivision. Today, NID holds permits from the California Department of Public Health (CDPH), Office of Drinking Water, for seven treatment plants with a combined capacity of 33.4 million gallons (MG), serving over 18,000 connections. Each WTP complies with applicable state and federal regulations including the Surface Water Treatment Rule and the Safe Drinking Water Act. Table 2-2 lists the water treatment plants, their existing capacity, proposed expansion capacity, and proposed expansion date. WTP Existing WTP Capacity, mgd Table 2-2. NID Water Treatment Plants Proposed Expansion, mgd Total Capacity (Existing + Proposed), mgd Proposed Expansion Date Loma Rica WTP E. George WTP Lake Wildwood WTP North Auburn WTP Lake of the Pines WTP Cascade Shores WTP Smartville WTP Lincoln Service Area -- (a) TOTAL (a) NID raw water is treated in Placer County Water Agency's treatment plant to serve NID customers in Lincoln. An NID treatment plant is proposed in approximately Historical and Projected Population 10631(a) (Describe the service area) current and projected population The projected population estimates shall be based upon data from the state, regional, or local service agency population projections within the service area of the urban water supplier (population projections) shall be in five-year increments to 20 years or as far as data is available. Historical population for NID s urban centers supplied by NID s distribution system is presented in Table 2-3. Year 2000 total population is based on the year 2000 census. Per DWR s Methodology for Calculating Baseline and Compliance Urban Per Capita Water Use (DWR Methodology) (DWR, October 1, 2010), Methodology 2: Service Area Population (Part II, Section M), NID falls into Category 2, a water supplier who has an electronic GIS map of their distribution area, but whose actual distribution area does not overlap substantially (>= 95%) with city boundaries. As a Category 2 water supplier who does not belong to an association of governments that develops population estimates for its members, NID must develop population estimates using either a per-connection or per-housing unit methodology 2-5 \\Bcsac01\projects\39000\ NID 2010 UWMP\04_Deliverables\4_1_Reports\2 Final\Final to DWR\Nevada Irrigation District 2010 UWMP docx

24 2010 Urban Water Management Plan Section 2 described in Appendix A of the DWR Methodology guidelines or another equivalent method that uses data either from the Department of Finance (DOF) or the US Census Bureau as its basis. The alternative methodology for service area population described in Appendix A of the DWR Methodology was followed for estimating NID s service area population from 1995 through This section describes the determination of NID s historical population for the retail service area. The detailed calculations to estimate the historical population is provided in Appendix E of this Plan. The year 2000 census population estimate is based on the total population by census block group. A census block is the smallest geographical unit used by the Census Bureau. Census blocks are areas bounded on all sides by visible features, such as streets, roads, streams, and railroad tracks, and by invisible boundaries such as city, town, township, county limits, and property lines. Census blocks are grouped into block groups. NID s GIS boundary map of the distribution area was overlayed on the 2000 census block group map to identify the census block groups located within NID s service area. Because there are dwelling units with NID s service area boundary that are served by private wells, an additional step was taken to estimate only the population served by NID s potable water distribution system so as not to include those served by private water supplies. This step included estimating the portion of the census blocks within NID s service area that are served by NID (versus the portion of the population in the census blocks served by private water supplies). NID s potable distribution system pipelines shapefile in conjunction with aerial photos were used to estimate the portion of the census block served by NID, in order to adjust for private wells within the service area. Figure 2-3 shows NID s retail service area, the 2000 census block groups, NID s distribution system, and the estimated percentage of each block group served by NID s retail water system. Appendix F contains a table of the 2000 census block groups and correlating estimated percentage of each block group served by NID s retail water system. 2-6 \\Bcsac01\projects\39000\ NID 2010 UWMP\04_Deliverables\4_1_Reports\2 Final\Final to DWR\Nevada Irrigation District 2010 UWMP docx

25 Yuba County 0 Nevada County Placer County El Dorado County Miles Legend % Percent of block group served by NID NID Service Area Railroad Commission Land Distribution Pipes PROJECT # DATE PROJECT TITLE Urban Water Management Plan Census Block Groups Served by NID Retail Water System County Line Note: Lands outside the District boundary entitled to water service per Railroad Commission Order Figure 2-3 FILE: P:\39000\ NID 2010 UWMP\03_Engineering\3_2_GIS-CAD\GIS\Block Groups with Percentages.mxd

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27 2010 Urban Water Management Plan Section 2 Once the portion of the census blocks within NID s service area that are served by NID s retail water system was identified including adjustment for private well supplies, each block s total population and population by structure type in 2000 was obtained from the Census Bureau s website. The population in single family and multi-family residences correlated with single family and multi-family connections, respectively, for the census year 2000, were used to develop a ratio of persons per residential connection for the year These ratios were applied to active residential connections data for non-census years to estimate non-census-year population. Table 2-3 provides the resulting historical population estimate of potable water system customers within NID from 1995 through Table 2-3. Historical Population Year Population (a) , , , , , , , , , , , , , , , ,761 (a) Source: Year 2000 Census data by census block correlated to historical NID residential connections. Appendix E and Appendix F contain the detailed information used to calculate the historical population. Figure 2-4 presents the historical population and number of connections or customers that are served by the NID s retail water system. 2-8 \\Bcsac01\projects\39000\ NID 2010 UWMP\04_Deliverables\4_1_Reports\2 Final\Final to DWR\Nevada Irrigation District 2010 UWMP docx

28 2010 Urban Water Management Plan Section 2 Figure 2-4. Historical Population and Number of Connections NID s potable water distribution system population is projected as a range based on a projected low customer growth rate and projected high customer growth rate. The average annual growth rates for both the low and high scenarios are shown in Table 2-4. These growth rates are based on customer growth projections estimated for each of NID s seven potable water service areas as estimated by NID staff. The projected connections by customer category are presented in Section 3 of this UWMP. For the purposes of the demand projections provided in Section 3 of this UWMP, the high population growth projection is utilized. Table 2-4. (DWR Table 2) Projected Population Year Population (a) Low Growth High Growth ,761 44, ,620 50, ,813 56, ,366 63, ,312 72, ,685 81,188 Source: Projected population is based on customer growth projections within each of the seven service areas. Note: For the purposes of the demand projections provided in Section 3 of this UWMP, the high population growth projection is utilized. (a) Service area population is defined as the population served by the distribution system. 2-9 \\Bcsac01\projects\39000\ NID 2010 UWMP\04_Deliverables\4_1_Reports\2 Final\Final to DWR\Nevada Irrigation District 2010 UWMP docx

29 2010 Urban Water Management Plan Section 2 NID population is expected to reach approximately 81,188in 2035 based on the high growth projection rate. The historical and projected population for NID are illustrated on Figure 2-5. The population growth rate from 2000 to 2010 was approximately 1.3 percent per year. The change in population from approximately 44,761 in 2010 to 81,188 in 2035, is a 2.4 percent average annual growth rate per. Figure 2-5. Historical and Projected Population 2-10 \\Bcsac01\projects\39000\ NID 2010 UWMP\04_Deliverables\4_1_Reports\2 Final\Final to DWR\Nevada Irrigation District 2010 UWMP docx

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31 Section 3 Historical and Projected Water Use 10631(e)(1) and(2) Quantify, to the extent records are available, past and current water use, and projected water use (over the same five-year increments described in subdivision (a)), identifying the uses among water use sectors, including, but not necessarily limited to, all of the following uses: (A) Single-family residential; (B) Multifamily; (C) Commercial; (D) Industrial; (E) Institutional and governmental; (F) Landscape; (G) Sales to other agencies; (H) Saline water intrusion barriers, groundwater recharge, or conjunctive use, or any combination thereof; (I) Agricultural. Water demand projections along with fire flow requirements provide the basis for sizing and staging future water facilities. This section describes the urban water system demands and presents an analysis of GPCD target water use and the resulting projections for future water supply needs for NID. 3.1 Historical Water Use Water production is the volume of water measured at the source, which includes all water delivered to residential, commercial, and public authority customers, as well as unaccounted-for water. Historical average annual and average daily treated water production is shown in Table 3-1. Total retail treated water production in 2009 was 11,863 acre-feet (ac-ft). This is the gross water use by NID. Per DWR s Methodology (DWR, October 1, 2010), gross water use is defined as the total volume of water, whether treated or untreated, entering the distribution system of an urban retail water supplier excluding the following: 1. Recycled water that is delivered within the service area of an urban retail water supplier or its urban wholesale water supplier 2. The net volume of water that the urban retail water supplier places into long-term storage 3. The volume of water the urban retail water supplier conveys for use by another urban water suppler 4. The volume of water delivered for agricultural use, except as otherwise provided in subdivision (f) of Section of the Act. 3-1 \\Bcsac01\projects\39000\ NID 2010 UWMP\04_Deliverables\4_1_Reports\2 Final\Final to DWR\Nevada Irrigation District 2010 UWMP docx

32 2010 Urban Water Management Plan Section 3 Table 3-1. Historical Retail Treated Water Production Year Annual Average Production ac-ft/yr mgd , , , , , , , , , , , , , , , , , , , Note: Based on WTP meters. This is considered NID s gross water use according to the definition of gross water use per DWR s Methodology (DWR, October 1, 2010). 3.2 GPCD Baseline and Targets (e) An urban retail water supplier shall include in its urban water management plan due in 2010 the baseline daily per capita water use, urban water use target, interim urban water use target, and compliance daily per capita water use, along with the basis for determining those estimates, including references to supporting data. Per the law as adopted in SBx7-7, NID must establish per capita water use targets using one of four methods 1. Method 1 - Eighty percent of the urban retail supplier s baseline per capita daily water use. 2. Method 2 - The per capita daily water use that is estimated using the sum of several defined performance standards. a) 55 gallons per day (gpd) for indoor residential water use. b) Water efficiency equivalent to the standards of the Model Water Efficient Landscape Ordinance for landscape irrigated through dedicated or residential meters or connections. 3-2 \\Bcsac01\projects\39000\ NID 2010 UWMP\04_Deliverables\4_1_Reports\2 Final\Final to DWR\Nevada Irrigation District 2010 UWMP docx

33 2010 Urban Water Management Plan Section 3 c) A 10 percent reduction in commercial, industrial, and institutional (CII) uses from the baseline CII water use by Method 3 - Ninety-five percent of the applicable state hydrologic region target, as set forth in the State s draft 20x2020 Water Conservation Plan. 4. Method 4 - Calculated water savings based on indoor residential water savings, metering savings, CII savings, and landscape and water loss savings, as set forth in DWR s Provisional Method 4 for Calculating Urban Water Use Targets, released February, Tables 3-2, 3-3, and 3-4 provide base period ranges and base daily per capita water use for 5-, 10-, and 15-year ranges used to estimate the Method 1 target. Regardless of which of the four methods is adopted by NID, the target may need to be adjusted further to achieve a minimum reduction in water use. If the five-year baseline water use is more than 100 GPCD, it must compare two values: percent of the five-year baseline daily per capita water use and 2. The target determined by the target method it adopted from the four methods allowed. The 2020 target is the lower of the two values. For NID, 95 percent of the five-year baseline daily per capita use is 232 GPCD (95% x 245 GPCD). NID has selected Method 1 to determine their urban water use target. Based on Method 1, NID s 2020 target is 203 GPCD with a 2015 interim target of 229 GPCD. NID s target using Method 1 will not have to be adjusted since it is lower than 95 percent of the five-year baseline. A detailed analysis of the GPCD target methods is provided in Appendix E. Table 3-2. (DWR Table 13) Zone 41 Retail Base Period Ranges Base Parameter Value Units 10- to 15-year base period 2008 total water deliveries 13,285 ac-ft/yr 2008 total volume of delivered recycled water - ac-ft/yr 2008 recycled water as a percent of total deliveries - percent Number of years in base period (a) 10 years Year beginning base period range 1999 Year ending base period range (b) year base period Number of years in base period 5 years Year beginning base period range 2004 Year ending base period range (c) 2008 (a) Per DWR Methodology, if the 2008 recycled water percent is less than 10 percent, then the first base period is a continuous 10-year period. If the amount of recycled water delivered in 2008 is 10 percent or greater, the first base period is a continuous 10- to 15-year period. (b) Per DWR Methodology, the ending year must be between December 31, 2004 and December 31, (c) Per DWR Methodology, the ending year must be between December 31, 2007 and December 31, \\Bcsac01\projects\39000\ NID 2010 UWMP\04_Deliverables\4_1_Reports\2 Final\Final to DWR\Nevada Irrigation District 2010 UWMP docx

34 2010 Urban Water Management Plan Section 3 Table 3-3. (DWR Table 14) Zone 41 Retail Base Daily per Capita Water Use to 15-year range Sequence Year Base period year Calendar Year Distribution System Population Daily system gross water use, ac-ft/yr Annual daily per capita water use, GPCD Year ,686 11, Year ,374 11, Year ,431 12, Year ,479 12, Year ,465 11, Year ,072 11, Year ,001 11, Year ,477 11, Year ,947 13, Year ,191 13, Year 11 Year 12 Year 13 Year 14 Year 15 Base Daily Per Capita Water Use 254 Sequence Year Table 3-4. (DWR Table 15) Base Daily per Capita Water Use - 5-year range Base period year Calendar Year Distribution System Population Daily system gross water use, ac-ft/yr Annual daily per capita water use, GPCD Year ,072 11, Year ,001 11, Year ,477 11, Year ,947 13, Year ,191 13, Base Daily Per Capita Water Use Projected Water Demands This section presents the projected water demands for three water year scenarios: normal year, single dry year, and multiple dry years. The demands for all water year scenarios are projected through \\Bcsac01\projects\39000\ NID 2010 UWMP\04_Deliverables\4_1_Reports\2 Final\Final to DWR\Nevada Irrigation District 2010 UWMP docx

35 2010 Urban Water Management Plan Section Projected Normal-Year Water Demands Normal-year water demands through the year 2035 are estimated based on the selected GPCD target chosen by NID as described in Section 3.3 and the projected population (see Table 2-4). These water demand projections for NID s retail customers are shown in Table 3-5 through Table 3-9 and are illustrated on Figure 3-1. The projected demand breakdown by customer category is based on the year 2009 demand breakdown by customer category. In summary, from 2005 to 2009, NID total water demands fluctuated, with an overall increase of 2.7 percent, which is an average annual growth rate of approximately 0.7 percent per year. Annual average total NID treated water retail demands are expected to increase at an approximate average annual growth rate of 0.5 percent per year from 2009 to Table 3-5. (DWR Table 3) Water System Projected Water Demands and Number of Accounts, Actual 2005 Water Use Category # of accounts Metered Volume, ac-ft/yr 2005 # of accounts Not metered Volume, ac-ft/yr Total volume, ac-ft/yr Single-family 17,268 6, ,648 Multi-family 341 1, ,145 Commercial Industrial Institutional Landscape irrigation Total 18,419 10, ,029 Table 3-6. (DWR Table 4) Water System Projected Water Demands and Number of Accounts, Actual Metered Not metered Water Use Category Total volume, # of Volume, # of Volume, ac-ft/yr accounts ac-ft/yr accounts ac-ft/yr Single-family 17,561 5, ,714 Multi-family 347 1, ,088 Commercial Industrial Institutional Landscape irrigation Total 18,760 9, , \\Bcsac01\projects\39000\ NID 2010 UWMP\04_Deliverables\4_1_Reports\2 Final\Final to DWR\Nevada Irrigation District 2010 UWMP docx

36 2010 Urban Water Management Plan Section 3 Table 3-7. (DWR Table 5) Water System Projected Water Demands and Number of Accounts, Projected 2015 Water Use Category # of accounts Metered Volume, ac-ft/yr 2015 # of accounts Not metered Volume, ac-ft/yr Total volume, ac-ft/yr Single-family 19,586 6, ,662 Multi-family 387 1, ,084 Commercial Industrial Institutional Landscape irrigation Total 20,923 10, ,346 Table 3-8. (DWR Table 6) Water System Projected Water Demands and Number of Accounts, Projected 2020 Water Use Category # of accounts Metered Volume, ac-ft/yr 2020 # of accounts Not metered Volume, ac-ft/yr Total volume, ac-ft/yr Single-family 22,031 6, ,523 Multi-family 435 1, ,073 Commercial Industrial Institutional Landscape irrigation 259 1, ,102 Total 23,535 10, , \\Bcsac01\projects\39000\ NID 2010 UWMP\04_Deliverables\4_1_Reports\2 Final\Final to DWR\Nevada Irrigation District 2010 UWMP docx