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Last modified
1/25/2010 7:14:23 PM
Creation date
10/5/2006 3:33:46 AM
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Template:
Floodplain Documents
County
Statewide
Community
New England
Basin
Statewide
Title
Modelling the Dynamic Response of Floodplains to Urbanization in Eastern New England Completion Report
Date
1/1/1978
Prepared By
CSU Environmental Resources Center
Floodplain - Doc Type
Educational/Technical/Reference Information
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<br />-5- <br /> <br />. <br /> <br />factor ranging from two to eight because of greater runoff volumes. The <br /> <br />study is basically a more sophisticated replication of Carter's earlier <br />work. In another investigation of urbanizing watersheds near Philadel- <br />phia, Hammer (1972) related channel enlargements to a host of land use <br />and other watershed parameters, the most important of which were type of <br /> <br />impervious area, soil drainage characteristics and slope, He also dis- <br /> <br />cussed the relation of these findings to studies by Leopold on flood <br />frequency and channel geometry. In the latter case, Leopold (1968) sug- <br />gested that the frequency of occurrence of low and intermediate magnitude <br />floods is greatly increased by urbanization, but that these effects be- <br />come insignificant for rarer events. <br />One of the more interesting studies with respect to the research re- <br />ported here was conducted by Espey and Winslow (1974). Working primarily <br />with watersheds in Texas, they observed comparatively larger discharges <br />for all return periods in urbanized basins than in nearby non-urbanized <br />basins. In one case, the increase seemed to reach a maximum near the <br /> <br />design frequency of the storm sewers. In a second case involving two <br /> <br />watersheds, however, the impact appeared to extend over the entire range <br /> <br />of expectancies, being greatest for the lOO-year flood. Unfortunately, <br />there is some question regarding the significance of their findings be- <br />cause of the limited hydrOlogic data and the small number of watersheds <br />on which they are based. <br />In summary, previous work has focused on fairly small urban basins <br />in geographic settings of gentle, fluvial topography, has tended to em- <br />phasize the effects of urbanization on hydrographs, and has dealt with <br />flood expectancy in quite general terms. Most importantly, almost no <br />research has been conducted on this topic in the New England region where <br />
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