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The image presents a comparative graphical depiction of water runoff in forested and urban settings. Both sections of the graph start with precipitation elements at the top. In the forested section, arrows point downward showing "Infiltration" through a "Permeable topsoil" and "Less permeable subsoil on rock" leading to "Water table" and then "Baseflow" with lateral arrows indicating "Evaporation" and "Transpiration" at the tree level, and "Runoff" at surface level. In contrast, the urban section arrows point towards "Reduced transpiration" and "Reduced evaporation" at the building level, with a significant arrow marked "Increased runoff" with side annotation "polluted" leading to "Increased erosion" with a consequential decrease in "Infiltration" and "Baseflow" compared to the forested section. There are no numerical data points or percentages provided.
Given the complexity of the image, the above description may not be entirely accurate.
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The diagram illustrates the process of the water cycle in forested and urban areas.
Overall, it is immediately apparent that, due to the difference in regional development, the levels of the water table and the amounts of transpiration, baseflow, erosion, and so on differ between urban and forested areas, although the amount of precipitation is the same.
In forest areas, the rain is subjected to permeable topsoil and infiltrates into a zone called “less permeable subsoil on rock,” then the water seeps into the water table, followed by baseflow. Meanwhile, some water is evaporated or transpired back into the atmosphere. Additionally, some precipitation follows surface runoff.
On the other hand, precipitation in urban areas is aligned with a similar process to that in forests. However, the amount of polluted runoff increases. Furthermore, evaporation and transpiration are reduced due to the development of cities. Infiltration and baseflow are reduced as well, while erosion is increased.
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