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<br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br /> <br />GLOSSARY <br /> <br />Backwater Effect. The rise in surface elevation of flowing water upstream from <br />and as a result of an obstruction to flow. <br /> <br />Channel. A natural or artificial watercourse of perceptible extent with definite <br />bed and banks to confine and conduct continuously or periodically flowing <br />water. <br /> <br />Cloudburst. A sudden and extremely heavy downpour of rain that is small in <br />areal extent; of short duration; and may be accompanied by lightning, <br />thunder. and strong gusts of wind. <br /> <br />Conveyance Capacity. <br /> <br />a. Channel conveyance capacity is the rate of discharge, in cubic feet per <br />second, which can flow in a .water course with the water surface <br />not greater than the height of the channel banks. <br /> <br />b. Floodway conveyance capacity is the rate of discharge in the overflow <br />portion of the floodway which can pass through a specified area at <br />depths and velocities governed by the hydraulic dimensions of the <br />floodway. <br /> <br />Designated Floodplain. The area designated as a floodplain by official action of the <br />board of county commissioners or city council with the prior concurrence of <br />the Colorado Water Conservation Board. <br /> <br />~. An overflow on lands not normally covered by water and that are used or <br />usable by man. Floods have two essential characteristics; the inundation of <br />land is temporary; and the land is adjacent to and inundated by overflow <br />from a river or stream or an ocean, lake or other body of standing water. <br /> <br />Normally a flood is considered as any temporary rise in streamflow or stage, <br />but not the ponding of surface water, that results in significant adverse <br />effects in the vicinity. Adverse effects may include damages from overflow <br />of land areas, temporary backwater effects in sewers and local drainage <br />channels, creation of unsanitary conditions or other unfavorable situations by <br />deposition of materials in stream channels during flood recessions, use of <br />ground water coincident with increased streamflow. and other problems. <br /> <br />Flood, 100-Year. A type of flood, including the water surface elevation and terri- <br />torial occupation thereof, which can be expected to occur at any time in a <br />given area based upon recorded historical precipitation and other representa- <br />tive data, with an average statistical chance of one percent being equalled or <br />exceeded during anyone year. The term is used interchangeably with a one <br /> <br />25 <br />