a) Precipitation
- For ground water to exist precipitation must exceed evaporation.
- Light rain falling over a long period of time infiltrates more than heavy short lived downpour.
b) Slope
- On flat and gently sloping areas rain water has ample time to infiltrate because it remains in one place for a long time.
- On steep areas there is low infiltration since a lot of water turns into runoff because of getting less time to percolate.
c) Nature of Rocks
- There is a greater possibility of existence of ground water where there are permeable surface rocks.
- Ground water exists where impermeable rock overlie an impermeable one so that when water infiltrates and percolates underground it’s trapped by impermeable rock and accumulates above it.
johnson mwenjera answered the question on January 9, 2018 at 17:56
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