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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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- Spring '09
- Hydrology, maximum discharge, flood control dams, Flood frequency curve