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SECTION 10.31 • (g) Definitions:- Unless specifically, defined below, words or phrases used in this Section shall. be interpreted so as to give them the same meaning an they have: at common law and to 'give this Section its most reasonable. application. • .(1) Bulkhead line: A geographic line along a reach of .a navigable stream that has been adopted by a municipal ordinance and approved by the Division of Nnvironmental. Protection pursuant to Section 3().11, Wisconsin Statutes and which allows complete filling on the landward side. (2):.C.hannel: A natural or artificial watercourse of perceptible extent, with . definite. bed and banks to confine and conduct continuously or periodically flowing water. Channel flow thus 'is. that water which is flowing within the limits of the defined channel. (3) Encroachment Lines: Are limits 'of obstruction to flood flows. These lines are generally parallel. to the stream. The.lines. are .established by assuming that the. . area landward side of the encroachment lines will be ultimately developed in such a way that it will not be available to.convey flood flows. The stream channel and adjoining flood plains between these lines will be maintained as open space and will be adequate to convey the regional flood without adversely increasing flood heights. (4) Equal -Degree of Encroachment: Is established by considering the effect of en- croachments of the hydraulic efficiency of the flood plain along a significant reach' of the stream. Hydraulic efficiency depends on such factors as the relative orientation of the channel with respect to the floodway, the natural and man-made characteristics of the flood plain, relative ground level on both sides of the stream, .the type of vegetation on both sides of the stream and the resistance of such vegetation to flood flows. In most cases these factors will not result in ' equal distances or areas between encroachment lines on both sides of the stream. . • (5) Flood: A. temporary rise in stream flow or stage that results in water over- topping its banks and inundating area adjacent to the channel. (6) Flood Plain:- The land adjacent to a body .of water which has been or may be hereafter covered by flood water including but not limited to the regional flood. (.7) ' Floodway: The channel of a stream and those portions of the flood plain .ad- joining the channel that are required to carry and discharge the .flood water or . flood flows of any river or stream including but not limited to flood flows associa- ted with the regional flood. (8) —Flood Profile: ' A.graph or a longitudinal profile showing the relationship of the water surface elevation of a flood event to ,location along a stream or river. (9) Flood Proofing:- ' A combination Of structural provisions, changes, or adjust, ments to properties and structures subject to flooding primarily for the reduction or elimination of flood damages to properties, water and sanitary facilities, structures,. and contents of buildings in a flood hazard area. (10). Flood Stage: For purposes of this Section the term is used to mean the height or elevation of .a flood as referred to some datum. For other purposes it . is, commonly :used to refer to the elevation at which a stream •will overtop its .nor- mal stage banks. • (11) Ordinary' High Water Mark: The highest point •on the bank of a normal stage channel at' which the water level has been for a sufficient period Of time 'to leave a definite mark. (12) Reach: . A hydraulic engineering term to-.describe longitudinal segments of a stream or river. ' A reach will generally include the segment of the flood plain where flood heights are primarily controlled by man-made or natural flood plain obstructions or restrictions. In an urban area, the segment of a stream or river between two consecutive bridge crossings would most likely be a reach® - 36 -