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<br />. Busy Day - The busy day of a <br />typical week in the peak month. <br /> <br />. Design Hour - The peak hour <br />within the design day. <br /> <br />Without an airport traffic control tower, <br />adequate operational information is not <br />available to directly determine peak <br />general aviation operational activity at <br />the airport. Therefore, peak period <br />forecasts have been determined <br />according to trends experienced at <br />similar airports. <br /> <br />Typically, the peak month for activity at <br />general aviation airports approximates <br /> <br />10 to 15 percent of the airport's annual <br />operations. For planning purposes, <br />peak month operations have been <br />estimated as 13 percent of annual <br />operations. Based on peaking <br />characteristics from similar airports, <br />the typical busy day was determined by <br />multiplying the design day by twenty <br />percent of weekly operations during the <br />peak month, or 1.4. Design hour <br />operations were determined using 20 <br />percent of the design day operations. <br />The general aviation peaking <br />characteristics are summarized in <br />Table 2H. <br /> <br />TABLE2H <br />Peak Operations Forecasts <br /> 2000 Short Term Inter. Term Long Term <br />Annual Operations 103,300 129,300 145,500 194,500 <br />Peak Month 13,429 16,809 18,915 25,285 <br />Busy Day 627 784 883 1,180 <br />Design Day 448 560 631 843 <br />Design Hour 90 112 126 169 <br /> <br />ANNUAL INSTRUMENT <br />APPROACHES <br /> <br />An instrument approach as defined by <br />the FAA is "an approach to an airport <br />with the intent to land by an aircraft in <br />accordance with an Instrument Flight <br />Rule (IFR) flight plan, when visibility is <br />less than three miles and/or when the <br />ceiling is at or below the minimum <br />initial approach altitude." To qualifY as <br />an instrument approach at San Marcos <br />Municipal Airport, aircraft must land at <br /> <br />San Marcos Municipal Airport after <br />following one of the published <br />instrument approach procedures. <br /> <br />Annual instrument operations for San <br />Marcos are only available from FAA <br />sources for 1991 through 1994. Over <br />the period, annual instrument <br />approaches (AlA's) steadily increased <br />from 190 in 1991 to 378 in 1994. It can <br />be reasonably assumed that this <br />increase continued through the 1990's. <br /> <br />2-20 <br />