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Last modified
1/29/2010 10:15:20 AM
Creation date
10/4/2006 9:04:10 PM
Metadata
Fields
Template:
Floodplain Documents
Designation Number
149
County
Adams
Arapahoe
Douglas
Community
Denver Metro Region
Stream Name
Sanderson Gulch & North Sanderson Gulch
Title
Flood Hazard Area Delineation - Sanderson Gulch & North Sanderson Gulch
Date
8/1/1979
Designation Date
1/30/1980
Floodplain - Doc Type
Floodplain Report/Masterplan
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<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 />Avenue. New culverts were installed under Pierce, Quay and Upham <br />Streets and Wadsworth Boulevard. <br /> <br />Hydrologic and hydraulic investigations prepared by the Corps of <br />Engineers in their 1970 report, and by Gingery Associates, Inc., <br />in their 1972 report, show the potential for flooding in this <br />basin, particularly as urbanization nears completion. Fortunately, <br />improvements constructed through the foresight of the Urban Drain- <br />age and Flood Control District and the Cities of Denver and Lakewood <br />have served to greatly reduce the damage potential of future flood <br />events. <br /> <br />From the North Sanderson Gulch junction with Florida Avenue to <br />Garrison Street, the drainageway has been obliterated. Along this <br />reach, an enlarged storm sewer was installed to relieve the nuisance <br />of minor gulch flows. <br /> <br />All channel improvements were considered for the floodplain analysis <br />presented herein. The floodplain through these areas is described <br />later in this report. <br /> <br />- FLOOD RELATED STUDIES AND OTHER RELATED DATA - <br /> <br />- FLOOD HISTORY - <br /> <br />As mentioned previously, the U.S. Army Corps of Engineers in 1970 <br />complted a report entitled "Flood Plain Information, Volume V, <br />Denver Metropolitan Region, Colorado." This report presented <br />floodplain maps and flood profiles for the Intermediate Regional <br />Flood and the Standard Project Flood along Sanderson Gulch and <br />North Sanderson Gulch (Reference 2). <br /> <br />Major flood events have not occurred on Sanderson Gulch in the last <br />20 years. Prior to this time, "floods have undoubtedly occurred <br />on this stream, but the events have not been recorded because of <br />the small size of the streams and the lack of extensive urbaniza- <br />tion...." (Reference 2). This report further states that "Sanderson <br />Gulch has irrigation diversion canals crossing its channel. During <br />minor flooding, the water storage reservoirs and canals hold a <br />large portion of the floodwaters, making floods downstream appear <br />especially mild. However, during the large floods, the reservoirs <br />and canals fill quickly and must spill water. With storage spaces <br />full, there is an abrupt change from minor to major flooding" <br />(Reference 2). <br /> <br />In 1972, the report entitled "Major Drainageway Planning, Sanderson <br />Gulch/Weir Gulch" (Reference 1) was prepared for the Urban Drainage <br />and Flood Control District and the Cities of Denver and Lakewood. 'I'his report <br />developed hydrology and floodplain information for the Sanderson <br />Gulch basin in great detail. Flood profiles from this report were <br />used to develop damage estimates for future flood events in the <br />basin, and improvement alternatives were developed to reduce the <br />damage potential. The study resulted in preliminary planning of <br />drainage channel improvements along Sanderson and North Sanderson <br />Gulches. <br /> <br />These minor floods have certainly occurred along Sanderson Gulch <br />as evidence by the actions of local governing bodies. "In 1958, <br />for instance, the City of Denver initiated a floodplain zoning <br />ordinance along Sanderson Gulch. This zoning did much to restrict <br />development along this stream channel" (Reference 1). "In November, <br />1970, the Corps of Engineers released a Floodplain Information Study <br />covering Sanderson Gulch from Sheridan Boulevard to Wadsworth <br />Boulevard, and North Sanderson Gulch from its confluence with <br />Sanderson Gulch to Wadsworth Boulevard. This report was prepared <br />largely through the efforts of the Denver Regional Council of <br />Governments" (Reference 1). <br /> <br />Subsequent to this study, many of the proposed improvements have <br />been designed and constructed. <br /> <br />- HYDROLOGIC AND HYDRAULIC DETERMINATIONS - <br /> <br />Hydrologic Analysis <br /> <br />A hydrologic analysis was prepared for the Sanderson Gulch and <br />North Sanderson Gulch basins in the previous major drainageway <br /> <br />(3) <br />
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