THE THIRD PLANET STUDY GUIDE 3

THE THIRD PLANET STUDY GUIDE 3 - #4 NATURALDISASTERS...

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THE THIRD PLANET STUDY GUIDE #4  NATURAL DISASTERS  What can be built on a floodplain?  Agriculture   Describe an upstream flood or flash flood Because they effect he upstream part of the river system.    What factors contribute to Central Texas flash flooding?  1) Impermeable rock 2) Sparse Vegetation 3) Narrow canyons 4) Prodigious Rainfall Rates   How does the Balcones Escarpment affect rainfall rates?  Average annual Rainfall: 30” Austin, 18” Del Rio Thrall (near Austin) 38.2” in 24 hours D’Hanis (toward Del Rio) 22” in 2 ¾ hours        How is the greatest flood in Texas history related to downtown San Antonio? Destroyed downtown San Antonio so bad they had to call the national guard. They  created a damn that made the water go under ground under the city and back out at the  other end of the city. Helped created the river walk saving downtown San Antonio from 
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THE THIRD PLANET STUDY GUIDE 3 - #4 NATURALDISASTERS...

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