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~ 1 <br />Riprap Broken stone or boulders placed compactly <br />or irregularly on earth or gravel sur- <br />faces to protect against the erosive <br />action of water. <br />River Banks The banks of a river or a stream. <br />Riverside Berms Berms immediately adjacent to a river or <br />a stream (see berms). <br />Rubble inert materials such as concrete blocks, <br />broken concrete, or concrete pavement <br />with a specific gravity of 2.3 or greater <br />which can be used in lieu of rock riprap <br />for erosion protection. <br />Safety Factor The ratio of forces resisting movement to <br />those attempting to initiate movement. <br />(abbreviated SF). <br />Setback The distance between any property line <br />and the wall or support of structure. <br />Setbacks are not applicable to fences <br />except where specifically indicated. <br />Thalweg The lowest portion of a river or a stream <br />channel. <br />Urban Storm Drainage (Abbreviated USDCM) The latest version of <br />Criteria Manual the Criteria of the Urban Drainage and <br />Flood Control District. <br />UD6FCD GRAVEL GUIDELINES 12/17/B7 <br />1-6 <br />