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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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Note: Both the topic and the answer were created by one of our users.
Two flow charts show water falling, flowing and flying back into the sky on a forest area on the left and a city area on the right. The difference between the two areas is shown in the details.
There is more evaporation in the forest and more transpiration. The rainfall is the same in the two charts, but there are no trees in the city and the water runs down the hill quickly, as the bigger arrows sugest that.
The same applies to infiltration; the signs under the forest show more water going deep down. In the city there is less. This is also shown in the water table which is much deeper under the urban.
Regarding erosion, the effects of the points above mean that more run off on the city side creates stronger flow in stream and rivers and the river at the bottom gets deeper too. The increased pollution is also mentioned, but not on the forest side.
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