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Last modified
1/26/2010 10:08:51 AM
Creation date
10/5/2006 4:11:52 AM
Metadata
Fields
Template:
Floodplain Documents
County
Statewide
Community
State of Colorado
Stream Name
All
Basin
Statewide
Title
1999 Flood Documentation Report (SOQ)
Date
6/14/1999
Prepared For
State of Colorado
Prepared By
Boyle Engineering Corporation
Floodplain - Doc Type
Miscellaneous
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<br />Grant County, Oklahoma J<loOO Investigation <br /> <br />Project Location; <br />Project Budget: <br />Year Completed: <br />Client: <br /> <br />Grant County, Oklahoma <br />$30,000 <br />1998 <br />Union Pacific Railroad <br />1416 Dodge Street <br />Room 1000 <br />Omaha, NE 68179 <br /> <br />In early August 1995, Tropical Storm Dean came up though Texas and stalled out over northwest <br />Oklahoma. Heavy rains of up to 6-7 inches caused seven~ flooding over a large area of Grant County. <br />Particularly hard hit was the Town of Jefferson, which is bounded by Osage Creek on the north and east <br />and by Pond Creek on the south and west. The two crr-eks join about 3000 feet east of town. The <br />residents of Jefferson filed suit against the Union Pacific Railroad (UPRR), claiming that the railroad <br />embankment acted as a dam and that the railroad's drainage structures were inadequate. <br /> <br />The UPRR Structural Department requested that Boyle prepare an evaluation of the flood. Boyle <br />contacted local, state, and federal agencies to collect precipitation and stream gage data, damage reports, <br />and other flood event documentation. Newspaper articles, floodplain mapping, and railroad information <br />were also obtained. A preliminary flood evaluation was presented in a tt:chnical memorandum. <br /> <br />For the trial testimony, the Tulsa law firm representing the UPRR chose to use a local expert <br />witness from Enid, Oklahoma. After the trial was over, tht~ UPRR Structural Department requested that <br />Boyle perform a hydrologic and hydraulic analysis of the j{lUr railroad briidges in the Osage CreekIPond <br />Creek floodplain to evaluate the effects of the court-mandated bridge improvements. After developing <br />estimates of the 50-year and 100-year peak discharges on Osage and Pond Creeks, Boyle surveyed the <br />channels and the four bridges and prepared a complex hydraulic model of the system (two creeks and four <br />bridges) using the U.S. Army Corps of Engineers HEC-RAS program. This model demonstrated that, <br />although flood levels would decrease with the larger bridge openings, a local topographic constriction at <br />the junction of the two creeks would still create significant backwater flooding during large flow events. <br /> <br />10 <br /> <br />ANdERSON CoN5UlTiN<j EN<jiNEERS, INC. <br />
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