Laserfiche WebLink
<br />iii <br /> <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 - continued <br /> <br />Primary Flood Hazard Areas. The lands adjoining the channel of a river, <br />stream or watercourse which would be covered by flood water during the <br />regulatory flood. These areas embrace those lands frequently designated <br />as floodway and flood fringe or flood plain districts on the official <br />zoning map pf the municipality. <br /> <br />Regional Flood. See Regulatory Flood. <br /> <br />Regulatory Flood. A flood which is representative of large floods known <br />to have occurred generally in Minnesota or one which is reasonably character- <br />istic of what can be expected to occur. This flood has generally been recog- <br />nized and accepted nationally be Federal and non-Federal agencies as one <br />with an average frequency of occurrence of about once in 100 years and is <br />synonomous with the term "Regional Flood" used in Minnesota Regulations <br />NR 85-93. <br /> <br />Flood Datum RFD. A level one foot above the regional (lOa-year <br />requency food plus any lncrease in flood level that would be caused by <br />future flood plain development outside the floodway. It is the datum in <br />Minnesota flood-proofing regulations used as the reference for determining <br />the elevation above mean sea level to which flood-proofing protection shall <br />be provided. "Regulatory flood datum" is synonymous with the term "flood <br />protection elevation" as used in Minnesota Regulations NR 85-93. <br /> <br />Secondary Flood Hazard Areas. The land beyond the limits of the regulatory <br />flood which could be affected by higher floods, by ground water or back <br />flooding of utility systems. <br /> <br />Standard Project Flood. The flood that may be expected from the most severe <br />combination of meteorological and hydrological conditions considered reason- <br />ably characteristic of the geographical area in which the drainage basin is <br />located, but excluding extremely rare combinations. A standard project flood <br />is intended to represent a degree of protection which should, where practicable <br />and/or economically feasible, be incorporated in the design of flood control <br />works. <br /> <br /> <br />lOa-Year Flood. A flood having an average frequency of occurrence of once in <br />lOa-years. See Regional Flood and Regulatory Flood. <br /> <br />- <br />