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A review of windrose information for Minneapolis -St. Paul <br />International Airport was undertaken. The National Climatic <br />Data Cente:'s most recent compilation covers the 10 year <br />period from 1965-1974. Figure 6-1 illustrates the percen- <br />tage of tine (10 year average) winds of varying velocities <br />occur. <br />The existing runway configuration provides crosswind <br />coverage a: 10.5 knots (12.5 MPH) as follows: <br />Runway 16-::4 <br />Runway 9-27 <br />Combined Coverage <br />90.3% <br />81.8% <br />99.1% <br />Various runway orientations were assessed for new runways. <br />A 16-34 orientation for the primary runway provides maximum <br />wind coverage (90.3%). The desired wind coverage, however, <br />is 95%. Since no single runway orientation can attain 95% <br />coverage at Gateway, possible development of a crosswind <br />runway was assessed to achieve a higher wind coverage. The <br />recommend & length for a crosswind runway is 80% of the <br />primary rurway length or 2600 feet. Preferred orientation <br />would be east -west providing a combined crosswind coverage <br />equal to the present configuration (99.1%). Due to site <br />restrictiors and funding limitations, however, no crosswind <br />runway is recommended in the development plan. <br />6.3 Taxiways <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 lengtk 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 aistance is 225 feet between taxiway centerline <br />and runway i:enterline for aircraft with wingspans less than <br />49 feet. I: 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 thal 49 feet. This separation distance also <br />increases the degree of flexibility for future development <br />beyond this planning period. <br />6-2 <br />