FLOODS. RIVER FLOODS Stream overflows levees Stream overflows levees Most destructive of all...

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FLOODS FLOODS

Transcript of FLOODS. RIVER FLOODS Stream overflows levees Stream overflows levees Most destructive of all...

  • FLOODS

  • RIVER FLOODSStream overflows leveesMost destructive of all geologic hazardsCausesWeatherDams breaking

  • Floods of the 20th century

  • Cincinnati, OH

  • Des Moines, Iowa 1993

  • Mississippi 2001

  • Artificial Levees

    To prevent river from floodingWalls made of-DirtSandbagsConcrete

  • levees

    DutchEngland

  • US levees

  • floodplainsFlat area around a river; floodsPaving creates more run-offLeaving natural, acts like sponge

  • Flood plain useBest use? Leave it alone!OK use? Golf course, park, farmWorst use?

  • How to recognize a floodplain?

  • Floodplain map

  • 100 year floodMisleading term1-in-a100 chance of river flooding every year! (1%)10 year flood?

  • 1 in 100 chance

  • How can flooding be good?When river floods, nutrients from bottom of the river are distributed onto landProvides natural fertilizerGreat farmland!

  • See any problems?

  • Marquette, MI 2003tourist park

  • Flood uncovered glacier grooves

  • Flood insuranceMost homeowners do not haveGovernment assistanceReliefrelocation

  • Flash FloodsMost deadlyMost vehicle related

    Due to impermeable ground

    Storm sewer back up

  • Vassar, MI 1986

  • Stream gauges measures stream height to calculate crest

  • OR gauges measure stream discharge

  • hydrograph

  • Damsincrease erosion downstream (white water)Increased deposition upstreamMake river colder

  • Glen Canyon DamPurposes:Flood controlElectricityDrinking water

  • Glen Canyon Dam

  • Hoover dam

  • Grand Canyon Floodinghttp://youtube.com/watch?v=EIXn_KNI5dQ

    To simulate natures floodsReplenish beaches

  • Water cycle


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Pyay - MYANMAR Magway Flood - 01/08/2015 · 2015-08-13 · Map Production Unusual heavy monsoon rains have been affecting Myanmar since 16 July causing river overflows and floods.

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