Lecture 10 - Long Island and NYC Water

Lecture 10 - Long Island and NYC Water - Long Island...

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Long Island Glacial Geology Harbor Hill moraine, Ronkonkoma moraine Formed at peak of last ice age
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Ice coverage of North America at peak of last Ice Age (about 20,000 years ago) Long Island Glacial Geology
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Long Island Glacial Geology
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Long Island Glacial Geology
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More than half of the world’s population lives in or near the coastal zones Groundwater pollution from saltwater intrusion is not a local isolated problem Causes major water supply problems in NY, FL, CA Case History: Long Island Saltwater intrusion mechanism Water table is inclined oceanward Wedge of saltwater is inclined landward Overpumping of groundwater Severe drawdown of groundwater causes saltwater ascension Saltwater Intrusion
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fresh water density = 1 gm/cc salt water density = 1.025 gm/cc Saltwater Intrusion
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Figure 13.13 Saltwater Intrusion
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http://www.geo.sunysb.edu/lig/Conferences/abstracts06/St umm_Lloyd.pdf Saltwater Intrusion
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Long Island is surrounded by salt water No recharge of fresh water outside Long
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Lecture 10 - Long Island and NYC Water - Long Island...

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