Groundwater Supply and Demand Ventura County Public Works Agency - PowerPoint PPT Presentation

Groundwater Supply and Demand – Ventura County Public Works Agency and FCGMA Perspective Presentation to Santa Clara River Watershed Committee July 23, 2015 Gerhardt Hubner, P.G. Deputy Director Watershed Protection District

2013 Water Supply and Demand Report

Ventura County Water Resources Municipal & Industrial Agriculture 42.7% 57.3% Slide 3

Ventura County Groundwater Resources and Users Agriculture Municipal & Industrial Slide 4

2014 Annual Report of Groundwater Conditions

Groundwater Basin Name: Oxnard Plain Pressure 2014 Groundwater Levels in General for All Wells Gauged by County 2014 Groundwater Quality in General for All Wells Sampled by County UAS "Key" well 01N21W07H01S - December level was down 10.73 feet from ( 42 wells) the January measurement. UAS - Oxnard Pressure basin groundwater: Oxnard aquifer samples are calcium sulfate type. Mugu aquifer samples are calcium sulfate type. LAS - Oxnard Pressure basin groundwater: Hueneme aquifer samples are calcium LAS "Key" well 01N21W32K01S - December level was up 8.10 feet from the sulfate type. Fox Canyon aquifer samples are sodium sulfate type. January measurement. Primary MCL Exceedances for Nitrate >45mg/l? Yes, 3 Wells Secondary MCL Exceedances for Chloride >250mg/l? No In general for 25 wells measured in 2014 in the basin, water levels declined in Secondary MCL Exceedances for TDS >500mg/l? Yes, 42 wells 22 and rose in 3 wells over the course of the year from the 1st quarter reading Secondary MCL Exceedances for Sulfate >250mg/l? Yes, 36 wells to the last quarter reading. 5 Year Groundwater Level Trend 2010 - 2014 5 Year Groundwater Quality Trend 2010-2014 Upper System UAS "Key" well 01N21W07H01S: SWN Nitrate Chloride TDS Sulfate 02N21W19A01S 02N22W24R02S LAS "Key" well 01N21W32K01S: 02N22W25A02S 02N22W25F01S Upper System 02N23W25M01S Lower System The 5 year trend based on a review of the Fall 2010 through Fall 2014 potentiometric surface maps is downward. SWN Nitrate Chloride TDS Sulfate 01N21W06L05S 01N21W08R01S 01N21W19J05S 01N21W20K03S 01N21W21H02S Lower System 01N21W21H03S The 5 year trend based on a review of the Fall 2010 through Fall 2014 potentiometric surface maps is downward. 01N21W28D01S 01N22W03F05S 01N22W16D04S 01N22W19A01S 02N21W20Q05S 02N22W36E02S For upper system, one well is in the northwest, the remaining wells are in the northeast. For lower system the wells are generally in the center of the basin along a northeast to southwest line, and a small group in the southeast. Groundwater Quality Trend Notes: Trend is relatively flat, or no clear trend Groundwater Level Trend Notes: Level trending up Level trending down Level trending up Level trending down

FCGMA Annual Report

149,715 AF

1990 2014

2013 FCGMA Annual Rainfall = 3.49 inches

2014 FCGMA Annual Rainfall = 10.05 inches

1990 2014

Where Can I Access These Reports? County 2014 Annual Report of Groundwater Conditions:  http://pwa.ventura.org/pwa/groundwater- resources FCGMA 2014 Annual Report:  http://fcgma.org/public-documents/reports