Effective length of a runway is the distance between

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Consider the following statements regarding ICAO recommendation for correction to basic runway length of these statements<br/>1. The basic runway length should be increased at the rate of 7 percent per 300 m rise in elevation above the mean sea level.<br/>2. The basic runway length after having been corrected for elevation should be further increased at the rate of 1 percent for every 1°C rise in airport reference temperature above the standard atmospheric temperature at that elevation.<br/>3. The runway length after having been corrected for elevation and temperature should be further increased at the rate of 20% for every 1 percent of effective gradient.

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