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A review of windrose information for Minneapolis -St. Paul <br />' International Airport was undertaken. The National Climatic <br />Data Center's most recent compilation covers the 10 year <br />period from 1965 -1974. Figure 6 -1 illustrates the percen- <br />tage of time (10 year average) winds of varying velocities <br />' occur. <br />The existing runway configuration provides crosswind <br />' coverage at 10.5 knots (12.5 MPH) as follows: <br />Runway 16 -34 90.38 <br />' Runway 9 -27 81.88 <br />Combined Coverage 99.18 <br />Various runway orientations were assessed for new runways. <br />A 16 -34 orientation for the primary runway provides maximum <br />wind coverage (90.38). The desired wind coverage, however, <br />is 958. Since no single runway orientation can attain 958 <br />' coverage at Gateway, possible development of a crosswind <br />runway was assessed to achieve a higher wind coverage. The <br />recommended length for a crosswind runway is 808 of the <br />' primary runway length or 2600 feet. Preferred orientation <br />would be east -west providing a combined crosswind coverage <br />equal to the present configuration (99.18). <br />' 6.3 Taxiways <br />I <br />i <br />A parallel taxiway is recommended as part of the fundamental <br />configuration if more than 20,000 annual operations.are <br />forecast to occur within two years of development. This <br />level of activity is forecast at Gateway within a two year <br />period after construction. It is, thus, recommended that a <br />full length parallel and connecting taxiways be developed <br />with initial construction. The taxiway width for Design <br />Group I aircraft is 25 feet. FAA's minimum recommended <br />separation distance is 225 feet between taxiway centerline <br />and runway centerline for aircraft with wingspans less than <br />49 feet. It is recommended, however, that the separation <br />distance be increased to 240 feet to provide lateral <br />clearance for occassional use by .aircraft with wingspans <br />greater than 49 feet. This separation distance also <br />increases the degree of flexibility for future development <br />beyond this planning period. <br />6.4 Approach Slopes /Operation Limitations <br />Runway 34 is a designated non - precision instrument runway <br />with a VOR approach. Minimums for Category A and B aircraft <br />are: <br />Straight -in 1 mile visibility and 1480' (605' MDA) <br />Circle -to -land 1 mile visibility and 1540' (665' MDA) <br />6 -2 <br />