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Proposed San Antonio Groundwater Availability Project

Proposed San Antonio Groundwater Availability Project. Claudia Faunt and Matt Landon California Water Science Center U.S. Geological Survey. Stakeholders. Overlying Land Owners Agricultural Interests Los Alamos Community Service District Vandenberg Air Force Base

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Proposed San Antonio Groundwater Availability Project

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  1. Proposed San Antonio Groundwater Availability Project Claudia Faunt and Matt Landon California Water Science Center U.S. Geological Survey

  2. Stakeholders • Overlying Land Owners • Agricultural Interests • Los Alamos Community Service District • Vandenberg Air Force Base • Santa Barbara County Water Agency • United States Geological Survey

  3. Benefits of the Study • Develop a greater understanding of the hydrology of the San Antonio Groundwater Basin • Quantify the resources of aquifer • Define groundwater availability with respect to quantity and quality • Predict potential effects of continued groundwater overdraft • Evaluate impacts of future groundwater development on different parts of the basin under differing climatic and cultural water use scenarios

  4. Objectives • refine the geohydrologic framework of the San Antonio Creek Valley, • quantify the hydrologic budget of the valley, and • develop hydrologic modeling tools to evaluate, analyze, and manage the groundwater resources.

  5. Study Area

  6. Project Tasks • data compilation and new data acquisition, • Increase groundwater level monitoring network • Increase water quality sampling • Drill dedicated observation wells • Install stream gauges (2) model development, (3) analysis of water availability, and (4) report preparation. Note: Santa Barbara County will be instrumental in the success of these tasks, particularly data acquisition.

  7. Current Hydrologic Data Map showing location of wells, generalized geology, and selected groundwater-level hydrographs.

  8. Multiple-Well Monitoring Sites typical construction

  9. Observation Well - Cuyama Example Foothill Road Multiple-Well Monitoring Site

  10. Recent Water Levels - Cuyama ~40 ft of annual water-level difference From USGS Geohydrology Report, 2013

  11. Stream Gauges - Cuyama Example Downward Looking Radar Continuous Stream Gauge: Upper Cuyama River, Ventucopa (11136500) Stream Gauge Installation: Reyes Ranch, Santa Barbara Canyon, Ventucopa (11136600) Discharge Graphs for Stream GaugesFrom USGS Geohydrology Report, 2013

  12. Integrated Hydrologic and GeohydrologicModel • MODFLOW with Farm Processes (Schmid and Hanson, 2005) • Finite Difference Integrated Hydrologic Model • Three dimensional representation of aquifer(s) and zones • Simulates recharge, evapotranspiration, flow to wells, flow through different zones From USGS Geologic Framework Report, 2013

  13. Hydrologic Analysis – Central Valley Example

  14. Hydrologic Analysis – Central Valley Example

  15. Estimated Timeline • Board of Supervisors hearing to approve project: Late summer, 2014 • Project kickoff: October, 2014 • Existing data compilation: Fall, 2014 • Drill dedicated observation wells and auger holes: 2015 • Expand water level and water quality monitoring network: 2015 - 2018 • Testing of hydraulic properties: 2015-2016 • Groundwater model development: 2017 • Analysis and report, project complete: 2018

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