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Chowan River TMDL Development Nottoway Area 08/31/04

Chowan River TMDL Development Nottoway Area 08/31/04. Historical data analysis Source assessment Physical Source Identification Bacterial source tracking Modeling Allocation. TMDL Development. Fecal Coliform Impairments. Impaired Stream Segments in the Nottoway River watershed.

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Chowan River TMDL Development Nottoway Area 08/31/04

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  1. Chowan River TMDL Development Nottoway Area 08/31/04

  2. Historical data analysis Source assessment Physical Source Identification Bacterial source tracking Modeling Allocation TMDL Development

  3. Fecal Coliform Impairments Impaired Stream Segments in the Nottoway River watershed

  4. Water Quality Data Analysis Location of VADEQ water quality monitoring stations used for TMDL assessment in the Nottoway River watershed

  5. Water Quality Data Analysis Fecal Coliform Concentrations

  6. Water Quality Data Analysis Location of BST water quality monitoring stations in the Nottoway River watershed

  7. Water Quality Data Analysis E. coli concentrations

  8. Water Quality Data Analysis • Statistical Analysis of Water Quality Measurements versus Precipitation to determine the relationship between rainfall and water quality • Summary of the Mood Median Test on mean monthly precipitation at station 444101 (p=0.013).

  9. Source Assessment • Identification of Sources • DEQ/DCR/Locality records • VPDES • U.S. Census • Ag Census • Habitat Analysis • Stakeholders, local knowledge – improve estimates • BST • Delivery Mechanisms • Direct • Land-applied • Exported Out of Watershed • Temporal Variation • Migration Patterns/Resident Populations • Import/Export of agricultural/STP waste?

  10. Permitted Discharges

  11. Permitted Discharges Indicates poultry facility with some animals outside watershed boundary ** Farm no longer active ND – no data, facility not required to submit monitoring data NA – Not available

  12. Human (2004)

  13. Sanitary sewer Overflows - reported to DEQ Exfiltration – rate from literature Failing septic systems Rate based on age of house Straight pipes U.S. Census and VDH consultation Human

  14. Pets (2004)

  15. Livestock - 1997

  16. Wildlife Population

  17. Bacterial Source Tracking Location of BST stations in the Nottoway River watershed

  18. Modeling • Hydrologic model • Runoff model • HSPF • Water Quality model • Source Assessment Results • HSPF • Model Calibration and Validation • Based on data availability, period of interest

  19. Modeling

  20. Modeling VADEQ Station 5ANTW155.06 and USGS Station #02044500

  21. Modeling VADEQ Station 5ALNT004.68 and USGS Station #02044500

  22. Hydrologic Calibration

  23. Hydrologic Calibration

  24. Modeling Source Loads • Source Characterization • Fecal production / densities / distribution • Delivery Mechanisms • Direct • Land-applied • Exported Out of Watershed • Temporal Variation

  25. Load Characteristics

  26. Model Load Characterization • “Direct to Stream” Loads • Point Sources: Design Flow/Fecal Discharge • Overflows: Reported overflow volume • Characterize Volume and Duration • Animal/Human: direct deposition, straight pipes • “Land Applied” Loads • Wildlife, Livestock, Pets • Transported to stream during runoff producing event • Use measured waste characteristics • Compute die-off in between events • Application timing

  27. Wildlife

  28. Livestock Average percentage of collected livestock waste applied throughout year

  29. Livestock Average time dairy milking cows spend in different areas per day

  30. Livestock Average time dry cows and replacement heifers spend in different areas per day

  31. Livestock Average time beef cows not confined in feedlots spend in areas per day

  32. Quantify Current Source Conditions Run model with present-day sources Develop reduction scenarios that will meet water quality standards 100% reduction in straight pipes, 25% reduction in failed septic systems 100% reduction in straight pipes, 50% reduction in livestock direct deposition Allocate loads to each source Allocation

  33. Livestock - 2002 * Must get information regarding import/export of poultry litter in watershed.

  34. Allocation

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