Now you don't need to remember all those trigonometric equations, or bring a calculator along either to use this trick. Just remember a few key angles (below) ...
Techniques: Estimating Slope Angles by Craig Dostie from Couloir XV-3, Dec. 2002
Estimating in the Field - w/Ski Poles Estimating slope angles is an important skill for ski mountaineers. Considering that avalanches occur more frequently on slopes angled at 38°, knowing exactly how steep a slope is can be important for understanding potential avalanche danger. Even if you’re not concerned about it for safety’s sake, but instead, want to prop up your ego, having an accurate measurement is imperative.
Estimating Slope Angle in the Field The best way to determine slope angle is with an inclinometer, a device to measure the incline of the slope. These are not expensive, and you can get one with a snow study kit from Life-Link. However, unless you’re taking an avalanche course on that particular day it seems nobody ever remembers to put an inclinometer in their pack. Avy instructors and experienced mountaineers can usually make accurate “eyeball estimates”, but what if you don’t have an inclinometer, or much experience? Or, perhaps you simply need to prove a point to your partners. Solution? Use your ski poles and a bit of trigonometry. Now you don’t need to remember all those trigonometric equations, or bring a calculator along either to use this trick. Just remember a few key angles (below) and the pole configurations that correlate and you’ll be set. 1. Start with two identically sized poles. All numbers shown are relative to pole length and depend on this basic equality to work. 2. Place the 1st pole vertically1 in the snow. 3. Hold the 2nd pole at a right angle (90°) to 1st so that it is horizontal. 4. Adjust the height of the 2nd pole until it touches the slope. 5. Estimate the height at which the 2nd pole crosses the 1st. 6. Using the major angles and these easy-to-estimate ratios, estimate the angle of the slope: 1:1/2 ~27° 1:3/4 ~37° 1:1 = 45° 1/2:1 ~63° 7) In general the best powder (er, highest avy potential) is found on slopes between 30°45°. Therefore, you only need remember two or three simple configurations. For slopes < 45°, the tip of the horiz. pole will cross the vertical pole some fraction of the way down the vertical pole For slopes > 45°, the horiz. pole will cross the vertical pole at it’s top, at a fraction of it’s own length.
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