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Why is Groundwater Important?

Why is Groundwater Important?. Drinking water for nearly 50% of US 98% of rural domestic supplies 35% of public supplies 42% of irrigation for agriculture Sustains flow of streams and rivers Maintains aquatic ecosystems. What Is Groundwater?. Contribution to Streamflow. GW. Runoff.

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Why is Groundwater Important?

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  1. Why is Groundwater Important? • Drinking water for nearly 50% of US • 98% of rural domestic supplies • 35% of public supplies • 42% of irrigation for agriculture • Sustains flow of streams and rivers • Maintains aquatic ecosystems

  2. What Is Groundwater?

  3. Contribution to Streamflow GW Runoff GW 54 Streams Range 14-90% • Average 52% • Geology • Physiography • Climate Runoff GW

  4. Groundwater and Drought

  5. Groundwater and Drought:Statewide Monitoring

  6. Why Measure Water Levels? “You can’t manage what you don’t measure” • Water level in a well is an indirect measure of the amount of water in the aquifer. • Principal source of information on the hydrologic stress on the aquifer • Provides the data necessary to • evaluate changes in the resource over time • develop models and forecast trends, and • design, implement, and monitor the effectiveness of groundwater management programs

  7. Groundwater Networks http://groundwaterwatch.usgs.gov/

  8. Existing Nationwide Coverage

  9. GWRP Regional GW Availability • Quantify current groundwater resources • Evaluate how these resources have changed over time • Provide tools to forecast system responses to stresses from future human and environmental uses. 11

  10. Principal Aquifers of the US Selected Priority Aquifers Regional Groundwater Availability Studies

  11. Ongoing or Completed Regional Studies

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