
	Watershed Assessment of River Stability & Sediment Supply (WARSSS)

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	EPA Home > Water > Wetlands, Oceans, & Watersheds > Watersheds > Tools > WARSSS > PLA > Hydrologic Relations: Step 2

Drainage Area

Delineate the watershed boundaries for all reaches of concern in PLA on a USGS 7.5' Quad map or use previous delineations from RLA or RRISSC phases. Calculate drainage area (sq. mi.) preferably using GIS or, if unavailable, with a manual area grid or dot-sample estimation technique.

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Prediction Level
Assessment

Steps

Hydrologic Relations
   1. USGS Regional Curves
   2. Drainage Area
   3. Field Calibration
   4. Final Determination
Stream Morphology
   5. Stream Classification
   6. Dimensionless Ratios
Stability Analysis
   7. Channel Stability
   8. Bank Erosion Prediction
   9. Bank Erosion Rates
Flow/Sediment Relations &
Sediment Rating Curves
  10. Flow Modifications
  11. Dimensionless Flow
  12. Bankfull Q & Sediment
  13. Dimensionless SRCs
  14. Bedload Rating
  15. Flow Duration Curves
  16. Flow-Related Yield
  17. Flow-Related Increases
Supply Changes
  18. Channel Changes
  19. Bedload Transport
  20. Hillslope Processes
  21. Hillslope Sediment
  22. Entrainment Calculation
Stability Consequences
  23. Sed. Transport Changes
  24. Aggradation Potential
  25. Degradation
  26. Enlargement
Summary Analysis
  27. State Shift
  28. Total Sediment
  29. Departure Analysis
  30. ID Loads by Category