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Lecture

GG101 Lecture Notes - Baseflow, Throughflow, Vadose Zone


Department
Geography
Course Code
GG101
Professor
James Hamilton

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GG101 Week 9 Lecture 2
4) Water Balance
Precipitation
o measure using rain gauges
o Lysimeter
o potential evapotranspiration (PE)
latitudinal pattern, as we move northward we have less potential
evapotranspiration
o Where there is a soil moisture deficit
AE will be less than PE
Withdrawing water faster than receiving it
o Plot a soil water balance (Fig 9.10)
allows us to see how much moisture we are utilizing and when the recharge to
the soils occur
precipitation (P)
PE
AE
Utilization
Deficit
difference between PE and AE
Recharge
o Soil moisture budgets (Fig 9.10)
Can you explain the differences between locations?
Slope Hydrology and Groundwater (chapter 9 and 14 pages 234-236, 246-254, 447-449)
Slope Hydrology
o fig 9.2
o P precipitation
infiltrates ground
can be intercepted
some moisture going to evaporate from tree canopy - evapotransporation
moisture can run off the surface directly (OF)
percolation can happen - water moving down into the soil itself
TH can happen - lateral movement of water, forced to migrate laterally
down slope
Some will percolate down to the water table
4 routes water can take to get to the channel
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