Lecture 13 - and covers land that is usually dry Recurrence...

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Lecture 13 9/20/10 Flooding - Stream hydrograph o Stream discharge versus time Volume of water flowing past a given point per unit time o Floods show up as peaks o Magnitude of a flood described by maximum discharge crest - Flood frequency curve - Human impacts on hydrology - Reducing flood hazards o Restrictive zoning o Flood-proofing buildings o o Channelization Widening, deepening, and/or diverting - Floods are a normal part of the environment, but they often seem “unusual” from a human perspective - Floods are among the most destructive of natural hazards - A flood is a high flow of water that overruns its normal confinement area
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Unformatted text preview: and covers land that is usually dry Recurrence Interval-Recurrence Interval (R) = average return time of maximum discharge or crest o R= (N=1)/M(yr) o N is number of years of records o M is rank of maximum discharge from N(smallest) to 1(largest)-Probability of occurrence in any given year )P) o P= 100/R(%) Human Impacts on Flood Severity-Covering the ground surface with impermeable materials o E.g., asphalt & concrete-Filling in flood plains o Buildings occupy volume formerly available to flood waters-Installing storm sewers & tile drains-Removing surface vegetation\-...
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Lecture 13 - and covers land that is usually dry Recurrence...

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