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<br />e. Side slopes generally of 4,1; accept,d)le from 3:1 to 5:1, <br />or more. <br /> <br />f. Centerline curvature of twice the top width, but not less <br />than 100 fee t. <br /> <br />g. Freeborad of from one to two feet, e.~ept where overbank <br />flow does not effect or cause damage. <br /> <br />h. The channel bottom should be lined wIth rlprap to carry Ir- <br />rigatIon releases from the Great Western Reservoir and Stand- <br />ley Lake. <br /> <br />I. The bottom of channel shall have a slope toward the trIckle <br />channel. <br /> <br />J. Froude number (turbulence factor) shall be less than 0.80. <br /> <br />k. HydraulIcs roughness In accordance with the Denver Regional <br />Council of Governments and other suitable criterIa. <br /> <br />1. Grass cover of crested wheat grass, or equal. <br /> <br />3. Rlprapped or Other LIned Channels. Higher velocity artIfIcal <br />channels wIll be used wIth discretion, and the'n only to accomodate <br />existing development for minimum re,aches. <br /> <br />a, Rlprap size, desIgn veloerty and "n" valves to be based upon <br />fIgures 19, 20, and 21 of the Bureau of Public Road publicatIon, <br />"Des I gn of Roads I de Ora I nage 0 I tches" and the Denvel" Reg I ona I <br />Council of Governments' criteria. <br /> <br />b. Side slopes from 3:1 to 2:1 may be rlprapped, but steeper <br />slopes must be solIdly lined with an anchored wall. The pre- <br />ferable section for steeper slele slope's 150.5:1 wIth a re- <br />taining wall structure embedded with natural stone. Care must <br />be taken for freeze, thaw, 9rolfldwater, and expans Ive soil <br />effects. <br /> <br />c. The bottom of channels must generally be lined when el ther <br />the velocIty exceed eight fps or the Froude number exceeds <br />0.8. <br /> <br />d. Use trIckle channels for low flows with capacltles of about <br />one percent of design flow, but not tD exceed 250 cfs. RIprap, <br />concrete, or other protectIon to prevent erosion Is needed. <br /> <br />v 1-.3 <br />