The standard aircraft departure climb gradient (CG) is 200 feet per nautical mile. This value is designed to provide 48 feet of clearance at one nautical mile from the departure end of the runway (DER).
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An uphill slope increases the take-off ground run, and a downhill slope increases the landing ground run. For example, an upslope of 2 percent increases take-off distance by about 15 percent and a 2 percent downslope decreases it by about 10 percent.