The process illustrates two identical natural processes in different areas.
Overall
, there are four main stages: precipitation, evaporation, transpiration and runoff, and these stages repeat themselves, Linking Words
However
, the lack of natural forest in the city affects the amount and quality of each stage in the water cycle.
Looking at the phases above the ground, precipitation in both areas remains the same. Linking Words
However
, the city is filled with industrial, commercial and residential buildings, Linking Words
while
the forested area is a natural reserve. Linking Words
Thus
, not only are evaporation and transpiration reduced, but the runoff is Linking Words
also
more polluted and higher in volume.
Linking Words
On the other hand
, the underground layers have Linking Words
also
been affected. The top layer of soil which easily allows liquids to be absorbed is much thinner in the urban region than in the natural forest. There is Linking Words
also
a thicker layer of less penetrable soil and water table. Linking Words
This
leads to less infiltration of water, reduced baseflow and increased erosion in the metropolis as compared to the forested land.Linking Words
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