Watershed Delineation Guide

Workflow

1. 1

   Acquire DEM And Preprocess

   45 min

   Fill sinks; verify vertical datum.

   Pipe Sizing CalculatorWater Pressure Calculator

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2. 2

   Delineate Pour Point Basin

   30 min

   Trace flow accumulation to outlet cell.

   Pipe Sizing CalculatorPipe Friction LossSewer Line Sizing

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3. 3

   Calculate Morphometric Indices

   1 hour

   Compute area, slope, and main channel length.

   Pipe Sizing CalculatorDocumented Expansion-Tank Acceptance RecordPEX vs Copper Cost

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4. 4

   Export For Hydrologic Model

   45 min

   Rasterize subbasins and stream network.

   Documented Expansion-Tank Acceptance RecordPipe Sizing CalculatorFixture Unit Count

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Tools Used

• Documented Water-Flow Continuity Record
  Supporting

  Main channel slope percentage.

• Pipe Sizing Calculator
  PrimaryReference

  Convert acres to km². · DEM licensing cost.

Reference Materials

• Sink Filling

  Unfilled sinks create artificial closed basins — always preprocess DEM.

• Stream Burning

  Burn known stream vectors into DEM for accurate channel placement.

• Field Verification

  Ground-truth pour point location — GIS delineation can miss subsurface drainage.

Related Scenarios

• Stream Gauging Station Guide
  HydrologyIntermediate2 tools
• Watershed Delineation Guide
  HydrologyBeginner2 tools
• Infiltration Test Guide
  HydrologyIntermediate1 tool