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Unformatted text preview: n = number of years m = rank number i.e.: if you had 99 years worth biggest R.I. = (99+1)/1 = 100 second biggest = (99+1)/2 = 50 smallest = (99+1)/99 = about 1 Can plot discharge versus R.I. on special graph paper Good R.I. analysis requires:- at least 30 years of observation- no major changes to the factors that control flooding over time • no climate change • no land use changes o urbanization o deforestation o engineer dams and levees ← ← ←- Red clay creek, Delaware, Oct. 2 2003 Mitigation Option 1) reduce volume of water supplied from upstream • build a dam • vegetation ← 2) “contain or reduce water levels • levees • bypass channels ← 3) flood insurance ← 4) abandon flood plain and let river flood ←...
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This note was uploaded on 08/30/2010 for the course GEOL 105 taught by Professor Kohut during the Spring '08 term at University of Delaware.
- Spring '08