Ground Water g110. Lecture prepared by Bob Hall Revised 8/6/2000. Points to Be Covered on Ground Water. How is ground water formed? What are the zones of subsurface water and their characteristics? What is a water table, and how is it configured in humid vs arid climates?
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Lecture prepared by Bob Hall
R = Recharge Area
R = Recharge area
in a Humid climate
Primary porosity depends upon:
- shape of grains
- arrangement of grains
- size distribution
Permeability: ability of an earth material to transmit water
- degree and size of interconnecting pores between larger poresHow does ground water move?
- degree of fracturing
- amount of solution (for limestone)
clay 45-55 %
limestone 1-10 (or larger)
An explanation of the factors determining the rate (velocity) of ground water flow.
V = K (h/l) where K = coefficient of
dh/dl = hydraulic gradient
in a humid climate
A permeable, water-containing unit.
- Water enters from recharge.
- Temporarily stored.
- Leaves by flow to streams (baseflow) or springs, or to wells
off at any point.
under atm pressure.
down from R.A.
- Water under hydrostatic
- Water rises; well may
Know how groundwater occurs and moves.
Know the factors that determine the direction and rate of movement.
Know how we can use groundwater safely, as well as the dangers of using it unwisely.