The Building Blocks of Elevation

Most golfers know how far they hit each club on a flat topography.  But a challenge course architects use to protect par is elevation change. 
When facing an uphill or downhill shot try to approximate the elevation change by thinking of a multi-story building, where each story equates to 10 feet.  To calculate the impact of elevation change subtract three yards for each "story" on downhill shots and add five yards for each "story" on uphill shots.  Reading the "stories" is key to choosing the correct club. This will likely change the club in your hands.