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<br />r <br />r <br />~ <br />r <br />r <br />I <br />I <br />I <br />l <br />Ie <br />l <br />l <br />l <br />t <br />l <br /> <br />J <br /> <br />:- <br /> <br />1 <br />t <br /> <br />J. <br /> <br />The results of the hydraulic analysi s are plotted on the profiles of <br />Figures 3-5. All hydraulic calculations and catlPuter runs are <br />included in the Appendix of thi s report. <br /> <br />v. <br /> <br />Effects of Proposed Map Amendments <br /> <br />The hydrologic and hydraulic analyses described herein substantiate <br />the justification for an amendment to the existing National Flood <br />Insurance Program maps for this area. <br /> <br />The previously mapped portion of the Dry Creek No. <br />dCMnstrearn of the Colorado and Southern Rai lroad is <br />1IDchanged . <br /> <br />1 channel <br />to remain <br /> <br />. Upstream of the railroad crossi ng, rev) S1 ons should reflect proposed <br />changes in the reach previously mapoed between the railroad and S1.IDset <br />Street. These changes reflect the existing limits of the lOa-year. St. <br />Vrain Creek floodplain and the elimination of the lOa-year floodplain <br />area resulting from Dry Creek No. 1 (now carried 1IDderground in <br />concrete box culverts). The 500-year floodplain area is a synthesi s <br />of the St. Vrai n Creek and Dry Creek No. 1 flooded areas. <br /> <br />The addition of floodplain designation for the channel reach upstream <br />of Sunset Street wi 11 requi re an extension of the floodplain area <br />mapping on Panel 5 of Camrunity Panel Number 080027-0005B, as well as <br />the creation of Panel 080027-0004A to include the proposed floodplain <br />mapping to a station approximately 2,760' upstream of Hover Road <br />(station 8905 in analysis). <br /> <br />All proposed rnap revi sions are illustrated on sheets 1, 2 and 3 in the <br />back cover pocket of thi s report. <br />