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<br />Introduction to the Technical Addendum <br /> <br />This technical addendum to the 1997 Flood Documentation report presents information on contacts <br />made (letters, email, and telephone messages); selected supporting data from federal, state, and local <br />sources; miscellaneous maps and information; and methodologies for certain calculations and <br />estimates. Section I contains general information that pertains to flooding in Colorado during the <br />summer of 1997. Section 1I presents specific information for each county that is documented in the <br />report. <br /> <br />As part of this project, RTi was tasked with conducting field work in Elbert, Lincoln, Morgan, and <br />Weld counties. These field trips involved surveying stream channels and high water marks to <br />estimate peak flood discharges. Specific details from these field trips are provided in their respective <br />county subsections in the technical addendum. However, brief synopses for each surveyed county are <br />provided below. <br /> <br />In Elbert County, stream channel cross sections and high water marks were surveyed on West Bijou <br />Creek near County Road 112 in the south-central portion of the county. Flood waters from the <br />extreme precipitation event of July 29 and 30, 1997, were partially drained by West Bijou Creek. <br />Therefore, flood discharge estimates were made for this stream. The methods and calculations used <br />for this estimate are presented in the Elbert County Calculations and Estimates subsection of this <br />addendum. <br /> <br />Surveying of stream channel cross sections and high water marks also was performed on South Rush <br />Creek in Elbert and Lincoln counties. These data were collected to help document flooding along <br />South Rush Creek in southeastern Elbert County and western Lincoln County caused by the same <br />July 29 and 30, 1997, storm event that caused flooding along West Bijou Creek. The methods and <br />calculations used for these estimates also are presented in the Calculations and Estimates subsections <br />for Elbert and Lincoln counties. <br /> <br />High water marks and steam channel cross sections were surveyed on Wildcat Creek in Morgan <br />County to help document flooding that occurred northwest. of Fort Morgan from the July 28-30, 1997, <br />rainfall event. The methods and calculations used for these estimates are presented in the Morgan <br />County Calculations and Estimates subsection of this addendum. <br /> <br />For Weld County, field work was completed just north of the state line in Kimball County, Nebraska, <br />on an unnamed tributary of Sidney Draw. This drainage was chosen to make flood discharge <br />estimates for the May 24, 1997, storm event. In addition, a field trip was conducted in southern Weld <br />County to collect information and data on the July 28, 1997, storm event. Information describing <br />field activities and flood discharge estimates for Weld County is presented in the Weld County <br />Calculations and Estimates subsection of this addendum. <br /> <br />d.f7'JIII'<h-w!dI,,!,!,,'di/llro.d(){ UIi/06/98 <br />