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<br />Guidelines Technical P.eview Guidelines for gravel <br />mining activities within or adjacent to <br />100-year floodplains. <br />Guidelines for Vegetation Lodi, Donald H., and Associates, "Guide- <br />lines for Development and Maintenance <br />of Natural Vegetation" for Urban Drainage <br />S Flood Control District, Denver, Colo- <br />rado, July, 1984. <br />High Water Line The elevation used to determine the <br />volume of overbank gravel pits. The high <br />water line elevation shall be the spill- <br />way elevation when only one spillway is <br />used or the average of both spillways <br />when two are used. <br />Hydraulic Radius The area of flow divided by the length of <br />the section exposed to water. <br />instream Mining Mines located in the channel of the South <br />Platte River or any of its tributaries, <br />or gravel mines which were originally out <br />of the channel if it is proposed to relo- <br />rate the river or stream through those <br />gravel mines in the future. <br />Interior Banks Banks which face the interior portion of <br />gravel pits. <br />Invert The lowest point in the river or stream <br />channel. <br />UDSFCD GRAVEL GUIDELINES 12/17/87 <br />1-4 <br />