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Streamflow is the “leftovers”
after soil storage and ET are
met
• Over long term, runoff depends on ppt and
ET
STREAMFLOW
• Inputs
– Mainly precipitation, some groundwater, fog
• Outputs
– Evaporation
– Transpiration
– Drainage
BASIC PRINCIPLE
OF WATER BALANCE
Water inputs to ecosystem
determines water outputs
• P + ∆S = ET + R
– P = Precipitation
– S = Storage
– ET = Evapotranspiration
– R = Runoff
THE WATER BALANCE
THE WATER BALANCE
P + Gin – (Q + ET + Gout) = 0
RO = Q + Gout = P – ET
P = I + AET + OF + SM + GWS + GWR
P = Precipitation; I = interception; AET = actual
evapotranspiration; OF = overland flow; SM =
change in soil moisture; GWS = change in
groundwater storage; GWR = groundwater runoff
THE WATER BALANCE
INFLOW – OUTFLOW = STORAGE

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Water balance.ppt

  • 1. Streamflow is the “leftovers” after soil storage and ET are met • Over long term, runoff depends on ppt and ET STREAMFLOW
  • 2. • Inputs – Mainly precipitation, some groundwater, fog • Outputs – Evaporation – Transpiration – Drainage BASIC PRINCIPLE OF WATER BALANCE
  • 3. Water inputs to ecosystem determines water outputs • P + ∆S = ET + R – P = Precipitation – S = Storage – ET = Evapotranspiration – R = Runoff THE WATER BALANCE
  • 4. THE WATER BALANCE P + Gin – (Q + ET + Gout) = 0 RO = Q + Gout = P – ET P = I + AET + OF + SM + GWS + GWR P = Precipitation; I = interception; AET = actual evapotranspiration; OF = overland flow; SM = change in soil moisture; GWS = change in groundwater storage; GWR = groundwater runoff
  • 5. THE WATER BALANCE INFLOW – OUTFLOW = STORAGE