Lecture 8 - Water Pollution

Lecture 8 - Water Pollution - Time lag between peak...

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Unformatted text preview: Time lag between peak rainfall and peak river flow depends on drainage surface Urban conditions (asphalt, pavement, buildings) cause much shorter time lag between peak rainfall and peak flooding Water Management http://ga.water.usgs.gov/edu/100yearflood.html Water Management Many western rivers (Los Angeles River) are completely encased in concrete Dry most of the time Extreme flood stage reached easily whenever it rains Water Management 12/1992: Noreaster raised water levels about 8.5 feet above normal http://stormy.msrc.sunysb.edu/mjb/stormsurgeeurope.html Flooding of FDR drive during 1992 nor'easter (photograph from Bloomfield, et al. Hot Nights in the City . EDF, NY) Water Management Flooding of train stations during 1992 nor'easter (photograph from Metro New York Hurricane Transport Study, 1995) New York City subways lost electrical power for entire system one train had to be backed out of tunnel that was filling with water hundreds of passengers had to be rescued from stranded trains Passengers had to be rescued from train stalled in PATH tunnel http://stormy.msrc.sunysb.edu/mjb/stormsurgeeurope.html Water Management Lower Manhattan, Jersey City, Hoboken: could be extensively flooded in...
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Lecture 8 - Water Pollution - Time lag between peak...

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