1. Controlling Floods Heavy rainfall over many days, overflowing rivers, and severe storms all cause floods. Technology for controlling floods offers both benefits and drawbacks.

2. Floods

3. Storm Drains Definition: Pipes that carry away storm water, usually from streets or parking lots. BenefitDrawbacks Can help prevent minor floodsMay not work properly if clogged go to next slide for another picture

5. Levees Definition: large wall along a river or other body of water. BenefitDrawbacks ~Can form naturally ~Manmade levees control floods along many rivers ~Can fail causing a lot of damage ~Depletes soil nutrients sand bags can be used as a temporar y levee Levee more pictures to follow

7. Dams and Reservoirs Dam: a wall across a river. Reservoir: river water that collects into an artificial lake behind a dam. BenefitDrawbacks ~Controls the flow of a river from season to season ~Allows for steady water supply ~Expensive to build ~Depletes soil nutrients go to next slide for another picture

9. Floodway Definition: a path for flood waters to flow over BenefitDrawbacks Can prevent damage from overflowing rivers Have to be maintained & take up space Land surroundin g river is not developed to prevent damage to homes and businesse s.