Too Much Water! Flooding

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Presentation transcript:

Too Much Water! Flooding Naturally caused by heavy rain & rapid melting of snow Used to occur every 50 years but now come about every 4 years Why?? –HUMANS!

Too Much Water! Humans increase the severity of flood damage Removing water-absorbing vegetation especially on hillsides Draining wetlands that absorb floodwaters & reduce severity of flooding Living on floodplains Urbanization Overgrazing Deforestation

Hillside Before and After Deforestation

Reducing Flood Risks Channelization—section of a stream is deepened, widened, or straightened to allow more rapid runoff Artificial levees—built along stream banks to reduce the chances of water overflowing into floodplains Increase the potential for water damage downstream Flood control dam—storing water in a reservoir and releasing it gradually Functions only if waters are kept low in the reservoir Dam operators find it more profitable to keep water levels high for producing electricity

Levees