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Happy Creek Sediment TMDL

Happy Creek Sediment TMDL. Technical Advisory Committee Meeting Gene Yagow July 23, 2014. Happy Creek Modeling Sub-watersheds. All Forest Load Multiplier (AllForX). Existing Condition. All Forest Condition. Existing Load All Forest Load. AllForX =.

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Happy Creek Sediment TMDL

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  1. Happy Creek Sediment TMDL Technical Advisory Committee Meeting Gene Yagow July 23, 2014

  2. Happy Creek Modeling Sub-watersheds

  3. All Forest Load Multiplier (AllForX) Existing Condition All Forest Condition Existing Load All Forest Load AllForX =

  4. Happy Creek Monitoring and Loads

  5. Final Selection of Comparison Watersheds

  6. Happy Creek AllForX Regression B C A Happy Creek B = AllForX value used for the TMDL; AC = the 80% Confidence Interval (shown in green); TMDL = AllForXB x All-forest load; MOS = (AllForXB – AllForXA) x All-forest load.

  7. Basic Criteria used for Selecting Comparison Watersheds • DEQ biomonitoring stations within 30 miles of Happy Creek • Average VSCI > 60 • Minimum VSCI > 55 • Minimum of 3 VSCI samples • Sampled since January 2005 • 2nd to 4th order streams • Only one comparison watershed per stream

  8. Sediment Load Calculation

  9. Allocation Scenarios

  10. Next Steps • Incorporate Happy Creek Sediment TMDL into a combined Shenandoah Tributaries TMDL Report • Hold the final Public Meeting • 30-day comment period • Address public and EPA comments to finalize the TMDL

  11. Questions? Gene Yagow Virginia Tech Biological Systems Engineering Dept. Email: eyagow@vt.edu Phone: 540-231-2538 ftp://bsesrv214.bse.vt.edu/Yagow/ShenandoahTribs/

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