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Home My WebLink AboutItem 6a - Water Resource Status Presentation2022 Water Resources Status ReportMay 3, 2022 Water Resource Status Report (Annual Water Supply and Demand Assessment)•Required by the City’s General Plan•Now required to be submitted to the State of California by the California Water Code•Summarizes the previous and current year’s water demands•Summarizes local water supply conditions•Identifies if City has adequate water supplies to meet projected water demands for the next year, assuming a dry year. Overview of the Water Resources Status Report1.Local Precipitation2.Reservoir Levels3.City Water Supplies4.City Water Demand5.Water Supply and Demand Assessment Results Nacimiento Reservoir Lake LevelIncreased storage by 77,150 acre-feetData from the U.S. Geological Survey at: https://waterdata.usgs.gov/monitoring-location/11149300/#parameterCode=62614&period=P7D City Water Supply Update City’s Total Available Water SupplyWater Resource Acre-Feet DescriptionNacimiento Reservoir5,482 Dependable Yield 1Salinas & Whale Rock Reservoirs4,910 Safe Annual Yield 2Recycled Water248 2021 Annual Usage 3Siltation from 2010 to 2060(500) WWME Policy A 4.2.2410,140 Total Availability City Water Supply AccountingTotal Water Supply: 10,140 AFPrimary Water Supply: 7,496 AFReliability Reserve: 1,207 AFSecondary Water Supply: 1,437 AFSiltation: 500 AFFiscal Year 2021 Water Use: 5,228 AF2021 Population: 46,0582035 Population: 57,200AF = acre-feetFY21 Water Use at 117 GPCD = 6,036 AF City Water Demands Worst Case Scenario Modeling 2013 Climate Conditions10+ Years Summary•Reservoir levels have been impacted by drought, but storage levels are currently about average•Residential uses continue to account for the majority of the City’s water demand (65%)•Current water use is 85% of the per-capita demand used to project future needs (100 GPCD versus 117 GPCD) Summary•Short-term assessment shows the City has adequate supply to meet current and dry-year demands•Long-term assessment shows that the City has greater than 10 years of water available•The City to continues to invest in the resiliency of its water supply portfolio, including diversification of water supply through groundwater and recycled water program expansion Drought Update & Next Steps•Statewide vs Local Drought•Potential Impacts of Governor’s Recent Executive Order•Improved Messaging Regarding Drought and Water Conservation•Progress Update on Expansion of Groundwater Pumping and Recycled Water Programs Region Currently in “Severe Drought” Drought Executive Order N-7-22•Signed by Governor Newsom on March 28, 2022•Drafted based on statewide drought conditions and not representative of local water supply conditions.Important Provisions•Consideration by the State Water Board to Consider on or before May 25, 2022 actions that could:•Require urban water suppliers to implement measures outlined in Stage 2 of their Water Shortage Contingency Plans.•Ban the irrigation of non-functional turf for commercial, institutional, and industrial customers. City Drought Response - CommunicationsUpdating community with drought and water supply information via website, social media, and radio advertising.Topics1. Current Water Supply Conditions2. Water Supply Planning and Policies3. Water Supply for Existing and Future Development4. The City’s Multi-Source Water Supply5. Water Planning Through a Changing Climate6. A History of Water Conservation7. How the City is Conserving Water8. How the Community can Conserve Water9. A Look to the Future – Water Use Efficiency Regulations and Additional Supply Water Supply ExpansionGroundwater Pumping Expansion•Wrapping up final stages of PCE groundwater contamination study (grant funded $1.9M)•Recently invited to submit a full grant application for implementation of groundwater cleanup related work ($6.3M with 10% match).Recycled Water Maximization•As part of 2021-23 Financial Plan funding was allocated for a Recycled Water Maximization Study•Study will examine potential uses of recycled water (agriculture, irrigation, groundwater recharge, surface water recharge, direct potable reuse) Recycled Water Maximization StudyMaximization Study will include an analysis of the following:•Policies related to the use of recycled water•Delivery capacity related to infrastructure •Seasonal availability and impacts of water conservation on available supply•Costs and impacts to costs related to WRRF upgrade•Regulatory limitations, including timelines for direct and indirect potable reuse•Regulatory requirements for a variety of potential uses•Legal protections of the City’s water rightsStudy to be completed and staff to return to City Council with an update by winter of 2022 Questions? RecommendationReceive and file the City's 2022 Water Supply and Demand Assessment. Rainfall Measurement LocationWatershed Annual Average Rainfall (inches)FY 2021 Total Rainfall (inches)FY 2022 Total Rainfall (inches)Rocky Butte Nacimiento Reservoir36 20 29HWY 46 and W 7 Mile Road, Cambria, CAWhale Rock Reservoir19 10 12SLO Reservoir San Luis Obispo Creek17 12 13Salinas Dam Salinas Reservoir 18 12 13Local Rainfall City’s Total Available Water SupplyWater Resource Acre-Feet DescriptionNacimiento Reservoir5,482 Dependable Yield 1Salinas & Whale Rock Reservoirs4,910 Safe Annual Yield 2Recycled Water248 2021 Annual Usage 3Siltation from 2010 to 2060(500) WWME Policy A 4.2.2410,140 Total Availability1.Dependable Yield is the contractual amount of water the City has rights tofrom Nacimiento Reservoir.2.The City’s Safe Annual Yield model was updated in 2018.3.The quantity of recycled water included (245 AF) is the actual prior year’susage (calendar year 2020) perGeneral Plan Water and WastewaterManagement ElementPolicy A 7.2.2.4.Reservoir siltation is a natural occurrence that reduces storage capacityoverlong periods, resulting in the reduction of safe annual yield. Projecting City Water Supply NeedsPrimary Water Supply- The amount of water needed to serve the City’s existing and future residential and non-residential water demand through General Plan build out in 2035.•117 gpcd x City Build-out Population •117 gpcd x 57,200 x 365 day/year x acre-ft ÷ 325,851 gallons = 7,496 acre-ft per year Reliability Reserve -The buffer for future unforeseen or unpredictable long-term water supply impacts. •117 gpcd x Current City Population x 20% •117 gpcd x 46,058 x 365 day/year x acre-ft ÷ 325,851 gallons x 20 percent = 1,207 acre-ft per year Secondary Water Supply -The amount of water needed to meet peak water demand periods or short-term loss of City water supply sources.•Current Annual Availability – Primary Water Supply – Reliability Reserve •10,140 acre-ft/year – 7,496 acre-ft/year – 1,207 acre-ft/year = 1,437 acre-ft per yeargpcd = gallons per capita per dayTN0 Slide 24TN0 [@Boerman, Mychal] how into the weeds do we want to get here? Do we discuss or mention development and how that is accounted for?Teague, Nick, 2022-04-26T15:52:29.165 Water Supply and Demand AssessmentProjected Potable Water Supply and Demand for Fiscal Year 2022-2023, in acre-feetPotable WaterJul Aug Sep Oct Nov Dec Jan Feb Mar Apr May Jun TotalAnticipated Unconstrained Demand576 593 558 548 468 430 429 415 443 484 574 579 6,096 Anticipated Total Water Supply940 969 909 892 756 691 690 666 713 782 937 946 9,891 Surplus/Shortage364 376 351 344 288 261 261 251 270 299 363 366 3,795 % Surplus/Shortage63% 63% 63% 63% 62% 61% 61% 60% 61% 62% 63% 63% 62% City Drought Response1.Focused on achieving voluntary compliance, as opposed to a mandatory rationing program;2.Rely on active enforcement of the water waste prohibitions; and3.Implement effective and engaging public information and education programs. Current Reservoir Levels WSCP Stage 2 - Warning Water Supply and Demand AssessmentPotable WaterJul Aug Sep Oct Nov Dec Jan Feb Mar Apr May Jun TotalAnticipated Unconstrained Demand459 486 468 450 402 333 311 368 420 479* 569* 573* 5,318 Anticipated Total Water Supply940 968 909 892 756 691 690 666 713 782 937 946 9,891 Surplus/Shortage482 482 441 442 354 357 379 298 307 304 369 372 4,587 % Surplus/Shortage105% 99% 94% 98% 88% 107% 122% 81% 76% 63% 65% 65% 86%Potable WaterNon-Potable Water* Denotes estimated demand valuesNon-PotableJul Aug Sep Oct Nov Dec Jan Feb Mar Apr May Jun TotalAnticipated Unconstrained Demand34 30 29 25 12 6 5 15 7 19* 28* 31* 241Anticipated Total Water Supply129 125 137 180 147 185 231 246 283 220 177 1582,217Surplus/Shortage95 95 108 156 135 179 226 231 276 201 149 1261,976% Surplus/Shortage278% 315% 372%626%1089%2909% 5026% 1543% 3698% 1075%536%403%818% City Water DemandsCity Water Demand by Sector During the 2021 and 2022 Fiscal YearsResidentialCommercial, Industrial, InstitutionalLandscape Irrigation (Potable)Landscape Irrigation (Recycled)Construction (Recycled)Total Metered Use2FY 2021 66% 20% 9% 5% <1% 4,743FY 2022(year-to-date)165% 22% 8% 4% 1% 3,1301. July 2021 through March 20222. In acre-feet. Does not include water loss due to distribution system leaks.