This diagram shows the water cycle in both forested and urban areas. Actually, it showed that absence of plants and trees in urban areas affects the water cycle rather than forested areas in different manners. This is obvious all over the steps of the water cycle.
Firstly, when the precipitation occurs in the forested areas water passes through two layers where filtration starts. On the other hand, in urban forests due to lack of any plants a reduced filtration occurs through a single layer not through a permeable topsoil and a less permeable subsoil on rock as in forested areas. In addition, in urban areas the base of water flow is reduced than in the forested areas.
Secondly, as the quantity of water permited through the soil in urban areas the transpirated and evaporated amount will be reduced respectively in comparison to the forested areas. Unfortunetly, this will lead to an increased polluted runoff rather than the forested areas runoff .Overall, the water cycle in forested areas is totally different in effeciency than in urban cycles.
