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<br />0021;:;9 <br /> <br />2,1,1 Alpine Village No.7 <br /> <br />Concern: <br /> <br />Minor flooding occurred to existing homes and buildings on <br />the north bank of the Rio Grande River in Sections 25 and 30 of <br />T 40N, R 3E and R 4E ,A discharge of 9040 c. f. s, put the river <br />just over the bank. A request was made to evaluate the area for <br />the possible need of a dike or dikes, <br /> <br />Findings: <br /> <br />A low levee approximately 3,000 feet long and an average of <br />4 feet high could be installed down the center of an existing <br />gravel public road parallel to the river maintained by the <br />county. In conjunction with this levee, approximately 800 feet <br />of the Gerrard Road from the bridge to the bluff north of the <br />bridge could be raised to elevation 3140, or even with the top of <br />the bridge. Raising the Gerrard Road would improve access to the <br />valley during floods, However, this action would have a negative <br />impact on existing homes west of the road. The alternative is to <br />run a 5 foot high levee approximately 1200 feet along the north <br />bank from the bridge to the road that runs along the bluff near <br />the inlet to the Highwater Ditch. A survey down the centerline <br />of the road would be required to accu~ately determine the volume <br />of material, Side slopes of 3 to 1 are recommended except at <br />driveways where 5 to 1 is recommended, <br /> <br />~'"..,",. <br />I /;z' I I <br />/. )r"! <br />I <br />'-< <br />I <br /> <br />~ <br /> <br />~::::~- _$'/ ar-4 <br />~ - _ ,7V~. <br />~~r.' - _ =- -=- -".....Q..,y.=i <br /> <br />20' <br /> <br />1 <br /> <br />I <br /> <br />)2. <br /> <br />I <br /> <br />>' <br /> <br />.1 <br /> <br />44 <br /> <br />TYPICAL SECTION <br /> <br />[ <br />, <br />, <br /> <br />The west end of the levee should tie into the existing <br />bridge abutment at Gerrard. The volume of the levee parallel to <br />the river downstream of the Gerrard Bridge is estimated at <br />44 x 4 x 3000 = 19.556 cubic yards. A minimum right-of-way 44 <br />27 <br />feet wide would be necessary, <br /> <br />21 <br />