08-23-2004 Council Packet - Laserfiche WebLink

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r*.. ] La (2) Defined floodplain boundary, 100-year flood, 931.5 feet MSL. Mean sea level means elevation measured in feet. Obstmction means any dam, wall, wharf, embankment, levee, dike, pile, bridge, abutment, projection, excavation, channel rectification, culvert, building, wire, fence, stockpile, refuse, fill, structure, or matter in, along, across, or projecting into any channel, watercourse, wetlands or regulatory flood hazard area which may impede, retard or change the direction of the flow of water, either in itself or by catching or collecting debris carried by such water, or that is placed where the flow of water might carry the same downstream to the damage of life and property. Natural obstruction means any rock, tree, gravel or analogous natural matter that is an obstruction and has been located within the floodplain by a nonltuman cause. Artificial obstruction means any obstmction which is not a natural obstmction. Ordinary’ high water level (OHWL) means the boundary of public waters and wetlands, and shall be an elevation delineating the highest water level which has been maintained for a sufficient period of time to leave evidence upon the landscape, commonly that point where the natural vegetation chang *s from predominantly aquatic to predominantly terrestrial. For water courses, the ordinary high water level is the elevation of the top of the bank of the channel. For reservoirs and flowages, the ordinary high w ater level is the operating elevation of the normal summer pool. The designated OHWL has been determined by the state department of natural resources for certain water bodies as indicated in article IX of this chapter. Reach means a hydraulic engineering term to describe a longitudinal segment of a stream or river influenced by a natural or manmade obstmction. In an urban area, the segment of a stream or river between two consecutive bridge crossings would most typically constitute a reach. Regional food means a flood which is representative of large floods know'n to have occurred generally in the state and reasonably characteristic of what can be expected to occur on an average frequency in the magnitude of the 100-year recurrence interval. The term is synonymous with the term "base flood" used in the flood insurance study. Structure means an>thing which is built, constmeted or erected, an edifice or building of any kind, or any piece of work artificially built up or composed of parts joined together in some definite manner, which requires a location on, below or above the ground, land or water. Wetlands and marshland mean lowlands covered with shallow and sometimes