Hydrology and Drainage Basin Morphology

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Hydrology and Drainage Basin Morphology
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The Hydrologic Cycle
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Water Balance Equation

• Inputs-Outputs Storage 0
• or
• PROET S
• where
• P precipitation
• RO runoff
• ET evapotranspiration
• S storage

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Processes in the Hydrologic Cycle

• precipitation (P)- liquid or solid state
• evapotranspiration (ET)-
• evaporation- conversion of solid or liquid water
  to gaseous water can take place from open water,
  soil, or vegetative surfaces
• transpiration- water taken up by plants is
  released in the gaseous phase

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• runoff (RO)-that part of precipitation that flows
  out of a watershed.
• 1. overland flow- flow occurs on impermeable
  surfaces or when the infiltration capacity of the
  soil is exceeded.
• 2. subsurface flow- lateral movement of water
  through the soil
• 3. groundwater flow- slow discharge of water from
  an aquifer into a stream
• 4. stream flow
• storage (S)

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