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The elevation of the spillway crest shall be approximately 1 <br />foot above the 2-year flood elevation. This is approximately 5 <br />feet above the channel invert for the Master Plan cross sec- <br />tion for South Platte River. <br />When the riverside berm length of the gravel pit, is less than <br />1,300 feet, only one side channel spillway will be required, <br />and it shall be located approximately in the midpoint of the <br />berm. If the length of the berm is greater than 1,300 feet, <br />two spillways will be required and will be located along the <br />berm appcoximately one-fourth of the berm length from the up- <br />stream and downstream ends of the berm. <br />When the length of the berm is less than 1,300 feet the spill- <br />way bottom length shall conform to the following geometric <br />relationship: <br />L~ = P112,000 <br />or <br />L~ ~ 100 feet whichever is greater. <br />In which <br />Ly = length of the side channel spillway <br />r area of pit measured in square feet at the high water <br />line <br />When the length of the riverside berm is greater than 1,300 <br />feet, two spillways shall be constructed and the bottom length <br />of each spillway shall conform to the following relationship: <br />Ls = 0.6 AP /12,000 <br />or <br />L~ = 100 feet whichever is greater <br />tJD6FCD GRAVEL. GUIDELINES 12/17/87 <br />2-20 <br />