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<br /> <br />-~- <br /> <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br /> <br />Constrictions in Channel Due to Development <br />As a consequence of the limited space on the valley floor and the <br />need to preserve portions of the valley as open space, such as parks and <br />golf courses, a significant pressure has developed for higher density <br />land utilization throughout the Gore Creek Valley. One of the results <br />of this land use pressure has been frequent infringement into the edges <br />of the natural flood plain. Unfortunately, this also has adversely <br />affected the aesthetic quality of the streamside environment. <br />The development has resulted in various man-made constrictions in <br />the channel and flood plain of Gore Creek, some in the form of bridges <br />and buildings and some as grade leveling and filling. <br />Consequently, the need has arisen for a hydrologic study to define <br />flooding threats to the existing development and provide information for <br />guiding orderly growth within the valley. <br />General Nature of Flooding <br />The Gore Creek watershed is sUbjected to both rainfall and snowmelt <br />flooding. The nature of the discharges during the spring snowmelt is a <br />typical diurnal fluctuation with a duration of high level discharges <br />(50% of peak discharge) of several days to two weeks. <br />Conversely, rainfall flooding which may occur for approximately one <br />hour will be localized and result from a thunderstorm occurring over one <br />or two of the sub-basins. The flood hazard due to rainfall, in contrast <br />to snowmelt flooding, is minimal on the main stem of Gore Creek but may <br />well be equal to or greater than snowmelt flooding for basins less than <br />ten squa\e miles in size. <br />