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, 4. Fiood - a temporary increase in the flow or stage of a stream or in t~le stage of a lake that results in the inundation of normally dry areas. 5. Flood Frequency - the average frequency, statistically determined, for which it is expected that a specific flood stage or discharge may be equal]ed or exceeded. 6. Flood Fringe - that portion of the flood plain outside of the floodway and one of the three zoning districts created hereby, the boundaries of which are shown on the Official Zoning Map. Flood3fringe is synonymous with the term "floodway fringe" used in the Flood Insurance Study for Arden Hills. 7. Flood Plain - the areas adjoining a watercourse which have been or here- after may be covered by the regional flood. 8. Flood-Proofing - a combination of structural provisions, changes, or adjustments to properties and structures subject to flooding, primarily for the reduction or elimination of flood damages. 9. Floodway - the channel of the watercourse and those portions of the adjoining flood plain which are reasonably required to carry and dis- charge the reqional flood and one of the three zoning districts created hereby, the boundaries of which are shown on the Official Zoning Map. 10. Obstruction - any dam, wall, wharf, embankment, levee, dike, pile, abutment, projection, excavation, channel modification, culvert, building, wire, fence, stockpile, refuse, fill, structure, or matter in, along, across, or projecting into any channel, watercourse, or regulatory flood plain 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. 11. Reach - a hydraulic engineering term to describe a longitudinal , segment of a stream or river influenced by a natural or man-made , obstruction. In an urban area, the segment of a stream or river between two consecutive bridge crossings would most typically con- stitute a reach. 12. Regional Flood - a flood which is representative of large floods known to have occurred generally in Minnesota and reasonably characteristic of what can be expected to occur on an average frequency in the mag- nitude of the 100-year recurrence interval. Regional flood is synonymous with the term "base flood" used in the F1ood Insurance ~ Study. 13. fe^ulatory Flood °rotection Elevation The Reaulatory Flood Protection Elevation shall be an elevation no lower than one foot above the eleva- tion of the regional flood plus any increases in flood elevation caused by encroachments on the flood plain that result from designation of a 'filoodway. 14. Structure - anything constructed the use of which requires more or less permanent location on the ground or attachment to something having a permanent location on the ground. SECTION III ESTABLISHMENT OF ZONING DISTRICTS A. Designation of Zoning Districts. The flood plain areas witnin tne juris- diction of this ordinance are hereby divided into three Districts as fol l ows : 3