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<br />Although it would be ideal for the City <br />to maintain all runways at San Marcos, <br />maintenance costs may prove to be <br />prohibitive. FAA and TxDOT typically <br />will not provide funding sources for the <br />maintenance of more than two runways <br />(or three runways if two are parallel) at <br />a general aviation airport unless <br />crosswind components justify their <br />funding. <br /> <br />As previously mentioned, Runway 17-35 <br />can singularly accommodate all cross- <br /> <br />wind components. Primary Runway 12- <br />30 provides over 93 percent coverage for <br />10.5 knots, and more than 97 percent at <br />13 knots. Analysis of dual runway <br />configurations presented in Table 3A <br />indicates that only two dual runway <br />combinations fail to provide greater <br />than 95 percent crosswind coverage <br />(combinations of Runways 4-22 and 8- <br />26 and Runways 8-26 and 12-30). <br /> <br />TABLE3A <br />Dual Runway Configuration Wind Coverage (I0.5kts.) <br />San Marcos Municipal Airport <br />Runway 4-22 8-26 12-30 17-35 <br />4-22 ---- 90.88 97.72 98.77 <br />8-26 90.88 ---- 94.18 99.53 <br />12-30 97.72 94.18 ---- 99.42 <br />17 -35 98.77 99.53 99.42 ---- <br /> <br />The combination of Runways 12-30 and <br />17 -35 provide the highest crosswind <br />coverage for 10.5 knots at 99.42 percent. <br />As clearly indicated in the table, any <br />dual runway combinations containing <br />Runway 17-35 provides the best <br />coverages. Dual runway combinations <br />containing primary Runway 12-30 <br />exceed 95 percent for 10.5 knots except <br />for Runway 8-26. All three runway <br />configuration combinations provide <br />greater than 95 percent coverage for all <br />crosswind components. <br /> <br />Although the wind coverage suggests <br />that one runway orientation, Runway <br />17 -35 would be adequate for all <br />crosswind components, providing a <br />crosswind runway is beneficial when <br />the primary runway must be closed for <br />any reason, particularly construction, <br /> <br />maintenance, or emergencies. The <br />availability of a crosswind runway can <br />allow the airport to remain in operation <br />during these periods. <br /> <br />Analysis in the next chapter will <br />consider the potential for ultimately <br />closing at least one runway. The <br />analysis will consider wind coverage as <br />well as other factors such as <br />convenience to the terminal area, <br />utility, function, and development <br />potential. <br /> <br />PHYSICAL <br />PLANNING CRITERIA <br /> <br />The selection of appropriate FAA and <br />TxDOT design standards for the <br />development and location of airport <br /> <br />3-4 <br />