Agricultural Demand Estimate and Basin Management Report May 14, 2014 Prepared for: Sacramento Central Groundwater Authority Presenter: Jim Blanke, PG CHG Complex Challenges | Innovative Solutions rmcwater.com Acknowledgements • • • • SCGA member agencies Aerojet SCGA staff Davids Engineering and RMC staff Background • Groundwater Management Plan accepted February 2006 • Plan calls for regular reporting • Reporting includes BMO analysis, which requires pumping information Pumping Data and Estimates • Pumping data available from most public entities and remediation sites Values estimated where not provided • Agricultural and agricultural-residential pumping requires estimates Ag Demand Estimates: Overall Process • SACOG 2008 Land Use Data • Updated using 2011 and 2012 data from the National Agricultural Statistics Service • Applied evapotranspiration data developed based on previous detailed remote sensing study • Applied the IWFM Demand Calculator (IDC) for root zone water balance • Result: estimated applied water need (pumping) Ag Demand Estimates • Six generalized land uses developed Field and truck crops Pasture and hay Vineyards and orchards Native Riparian / wetlands Rural residential Ag Demand Estimates • Field polygons based on 2008 SACOG land use Ag Demand Estimates • Selected polygons have “fixed” land use: Ag-Res Native Riparian/Wetlands Vineyard/Orchards Ag Demand Estimates • 2011/2012 Cropland Data Layer from USDA NASS applied to field polygons • Polygons with <80% single land use subject to additional QC Ag Demand Estimates • Classified 2011 land use Ag Demand Estimates: Acreage Estimate Land Use Fallow Field and Truck Pasture and Hay Vineyards and Orchards Native Riparian/Wetlands Rural Residential Total 2011 1,838 8,568 2012 1,423 7,166 30,346 32,073 9,175 9,036 48,477 48,477 1,721 1,873 13,878 13,955 114,003 114,003 Ag Demand Estimates • Crop Coefficients developed based on 2009 study of ET and CIMIS reference ET • Coeffiecients used with 2011/12 CIMIS ETo data Ag Demand Estimate – Root Zone Model • Utilized DWR’s IWFM Demand Calculator (IDC) Figure source: DWR 2011 Ag Demand Estimates Vineyards and Orchards 16% Rural Residential 13% Field and Truck 21% Total 133,700 AF Pasture and Hay 50% 2012 Ag Demand Estimates Vineyards and Orchards 16% Rural Residential 15% Field and Truck 16% Total 158,000 AF Pasture and Hay 53% 2011/2012 Ag Demand Estimates Groundwater Production (AF) 180,000 160,000 Vineyards/Orchards 140,000 120,000 Vineyards/Orchards 100,000 Field/Truck Field/Truck 80,000 60,000 40,000 20,000 0 Pasture/Hay Pasture/Hay Rural Residential Rural Residential 2011 2012 Year Ag Demand Estimates • Increase from 2011 and 2012 due to weather • Land use and cropping is similar • 2012 weather, compared to 2011: Higher ET Lower growing season precipitation 2011/2012 Reference ET – Lodi West • 2012 had higher ETo 9 6.7 7.0 2012 6.0 5.1 4.9 4.9 5 5.2 6 3.1 2.5 1.4 1.4 1.5 1.7 2.0 0.7 1 1.5 2 2.8 3 3.1 4 2.2 Monthly ETo (in) 7.6 6.7 7 2011 7.7 7.8 7.3 8 0 Jan Feb Mar Apr May Jun Jul Month Aug Sep Oct Nov Dec 2011/2012 Precipitation – Elk Grove Fish Hatchery • 2012 had lower rainfall in growing season 3.7 4 4.9 5 5.1 5.0 2011, Total: 14.7 in 2012, Total: 20.8 in 3.2 2.6 2 2.4 3 1.8 Jun Jul Aug Sep Month Oct Nov 0.3 May 0.0 0.0 Apr 0.0 0.0 Mar 0.0 0.0 Feb 0.0 Jan 0.0 0.1 0 0.9 0.9 1 1.0 1.2 1.3 1.0 Monthly Precipitation (in) 6 Dec Ag Demand Estimates • Important component of overall pumping estimates Developed for Basin Management Report • Measure for BMO compliance • Utilizes Ag and Ag-Res estimates • Incorporates data and estimates from other users Basin Management Report Update • Basin Conditions • Basin Management Activities • Conclusions and Recommendations Year Type • Sacramento Valley Water Year Type 2011: Wet Year 2012: Below Normal Year • Water Forum Agreement Water Year Type 2011: Wet Year 2012: Average Year BMO 1: Groundwater Production • “Maintain the long-term average extraction rate at or below 273,000 acre-feet/year” • Production based on Reported metered data • Large purveyors, Aerojet, and IRCTS Estimated values • • • • • • • Tokay Park Florin County Fruitridge Vista Parks, Golf Courses Agriculture Agriculture-Residential Mather Field and Kiefer Landfill Groundwater Production, 2011 FVWC GSWC Aerojet Cal-Am Ag-Res EGWD FCWD City of Sac. Kiefer SCWA Other Tokay Park WC Parks and Golf Agricultural Total 2011 Production: 233,600 AF Mather Groundwater Production, 2012 FVWC Aerojet GSWC Ag-Res EGWD FCWD City of Sac. Cal-Am SCWA Kiefer Tokay Park WC Other Parks and Golf Agricultural Total 2012 Production: 254,600 AF Mather Groundwater Production Groundwater Production (AFY) 300,000 BMO #1 Threshold: 273,000 AFY 250,000 200,000 150,000 100,000 50,000 0 2011 2012 Year Groundwater Pumping BMO 2: Groundwater Levels • “Maintain specific groundwater elevations within all areas of the basin consistent with the Water Forum ‘solution.’” • Groundwater elevations presented as contour maps and hydrographs Spring 2002 Spring 2012 Western Hydrographs Central Hydrographs Eastern Hydrographs BMO 3: Subsidence • “Protect against any potential inelastic land surface subsidence by limiting subsidence to no more than 0.007 feet per 1 foot of drawdown in the groundwater basin.” • No monitoring performed within SCGA during the reporting period • SGA reported subsidence measurements northeast of McClellan 0.3’ of subsidence from 1947-1969 1.9’ from 1969-1989 Associated with at least 68’ of water level decline in area BMO 4: Surface Water • “Protect against any adverse impacts to surface water flows in the American, Cosumnes, and Sacramento Rivers.” • Information on gages and streamflows compiled and updated in 2011 modeling document • Upcoming AB303-funded water quality and isotope study will increase understanding BMO 5: Water Quality Objectives • Water quality summarized for TDS Iron Manganese Arsenic Nitrate Chromium 6 “Principal” Contaminant Plumes TDS, 2012 • SMCL 500 mg/l 1,000 mg/l 1,500 mg/l Iron, 2012 • SMCL 300 µg/l Manganese, 2012 • SMCL 50 µg/l Arsenic, 2012 • MCL 10 µg/l Nitrate, 2012 • MCL 45 mg/l Hexavalent Chrome 2012 • Proposed MCL 10 µg/l “Principal” Contaminant Plumes, 2007 Based on 2007 data Activities • • • • Public Outreach HydroDMS Well Protection Plan Agriculture/Agriculture Residential Water Conservation • Control of the Migration and Remediation of Contaminated Water • CASGEM Recommendations • Develop Groundwater Accounting Program • Maintain and Update HydroDMS and groundwater model • Update the GMP • Update Monitoring Program Thank You Jim Blanke (916) 999-8762 [email protected]
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