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1 � <br /> ' Project Sponsors being the UD&FCD, Boulder County and the City of Boulder. The <br /> product of the Beck study was the publication of a document entitled Major Drainagewav <br /> Plannins - South Boulder Creek. The R.W. Beck study determined the 100-year flood <br /> discharge for South Boulder Creek to be approximately 5,600 cfs. The floodplain <br /> ' hydraulics analyzed in this document utilized the U.S. Bureau of Reclamation (USBR) <br /> backwater analysis model. The R.W. Beck study was one of the earliest studies <br /> ' undertaken by the UD&FCD following the District's formation in 1969. At the time this <br /> study was undertaken, the exact extent of the 100 and 500-year flood boundaries were <br /> ' not known and only estimated in order to determine the boundaries of the mapping <br /> required to complete the study. At the conclusion of the work effort, the Beck study <br /> reported that sufficient mapping to cover the resultant floodplain area was not available <br /> ' and a complete delineation could not be reported accurately in the study. It is interesting <br /> to note that the full extent of the floodplain was not shown on the mapping, yet the <br /> ' narrative portion of the Beck study reported that floodwaters escape to the north and west <br /> of the Deepe Property and flow in a north/west direction toward the Keewayden <br /> ' Meadows subdivision. The volume of water escaping to the north and the exact flow <br /> path was not clearly defined due to their lack of mapping. It should also be noted that <br /> ' the Beck study was undertaken prior to the Flatiron mining operations being commenced. <br /> Following is a quote from the Beck Study: <br /> ' The area along the north and south side of the Denver-Boulder Turnpike would <br /> have widespread shallow flooding in the event of major flows in the creek. The <br /> possible flooding would be due in part by the construction of the turnpike. Flood <br /> ' waters could spread northwest around the South Boulder Road interchange, over <br /> the turnpike and into parts of the Keewa_den Meadows area. At this point, the <br /> ' flows would be west of 47th Street (sic now Foothills Parkway) bypass which <br /> could present possible additional drainage problems. <br /> See Figure '_ for the Beck study's 100-year floodplain delineation. <br /> -4- <br />