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Key Components of Models

Key Components of Models. Point Sources Areal Contributions Ground water Surface runoff Atmospheric deposition Transport Processes Loss Processes. Nitrogen-loss Rate in Relation to Stream Channel Depth. Approaches to Setting Loss Coefficients. Textbook values / default values

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Key Components of Models

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  1. Key Components of Models • Point Sources • Areal Contributions • Ground water • Surface runoff • Atmospheric deposition • Transport Processes • Loss Processes

  2. Nitrogen-loss Rate in Relation to Stream Channel Depth

  3. Approaches to SettingLoss Coefficients • Textbook values / default values • Field-based determinations • Statistical estimation from monitoring data

  4. SPARROW SPAtially Referenced Regressions On Watershed Attributes

  5. Area of Hypoxic Zone, 1985-2000 Source: N.N. Rabalais, Louisiana Universities Marine Consortium, Chauvin, La.

  6. Nitrogen Fertilizer Use in the Mississippi Basin

  7. Annual Nitrate Flux to Gulf of Mexico and Mean Annual Streamflow

  8. Nitrogen in Commercial Fertilizer

  9. River Monitoring Stations & Major Watersheds: Mississippi River Basin

  10. Percentage of the Nitrogen Exported from Interior Watersheds that is Delivered to the Gulf

  11. Yield of Total Nitrogen Delivered to the Gulf from Incremental Drainage areas of the Mississippi River Basin

  12. Middle Snake River,Southern Idaho, Flow by Source Tributary Inflow 20% 66% 1% 12% Aquaculture Effluent Tributary Inflow Ground Water Discharge Upstream Inflow Sewage Treatment Effluent Irrigation Returns

  13. Sources of Discharge, Nitrogen, & Phosphorus: Middle Snake River, 1995

  14. Data Issues • Water quality data are expensive • Need to share existing data among agencies, groups (ACWI, NWQMC) • To be useful we need metadata on: place, time, method of collection and method of analysis • Need computer/web accessibility

  15. Nationwide Data Availability NWIS STORET

  16. NWIS-Web http://water.usgs.gov/nwis • 1.5 million sites (80% are wells) • 350,000 water quality sites • 19,000 streamflow sites • 5,000 real time sites • 4.3 million water quality samples • 64 million chemical analyses

  17. STORET-USEPA • Legacy STORET: Data through 1998, data of undocumented quality • New STORET: includes metadata descriptors, now includes data from 10 States, some States adding in last 10 yrs of data not in legacy data base • Both data sets available at http://www.epa.gov/storet/index.html

  18. Welcome to STORET, EPA's largest computerized environmental data system. STORET (short for STOrage and RETrieval) is a repository for water quality, biological, and physical data and is used by state environmental agencies, EPA and other federal agencies, universities, private citizens, and many others. Comments? If you have a question or comments on this website or on the STORET system, send us an email at STORET@epa.gov. EPA | Office of Water | Wetlands, Oceans, and Watersheds | Monitoring Water QualityLast revised November 16, 2000URL: http://www.epa.gov/storet/index.html

  19. Focus on the Science for Solutions

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