how are forests and vegetation helpful in preventing floods
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Trees and other vegetation in urban areas considerably reduce urban-water runoff. ... By intercepting and slowing precipitation hitting the ground, vegetation substantially reduces the volume and rate of stormwater runoff. This helps protect soil from erosion and reduces flash flooding
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When plants grow in an area, the roots of plants dig deep in to the soil and create space between soil particles. When it rains in highlands, water that flows downhill gets drained into the space created by the root system of plants. Due to this, chance of flooding is greatly reduced. When plants are absent, especially in rocky areas, rocks prevent water from seeping into the ground. This phenomenon is also observed in paved roads. Since there is no room for water to seep, flooding occurs in nearby water bodies. When a layer of water runs off a rocky surface, it reduces friction and the following layers of water will run more freely as there is less friction. If more water is dumped into rivers and lakes than they can handle, these water bodies tend to overflow and the banks burst and cause flooding. If there are more trees in an area that is prone to water runoffs, the root system of trees can create space between these rocks and hence reduce the amount of water being dumped into lakes and rivers.
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