Initial Publication Date: July 19, 2011

Calculating slope
Practice problems

Avalanche hazards

The following questions relate to the map below. You can view a larger version of this map by clicking on the map. You can also download a sheet that has the map and the sample problems (Acrobat (PDF) 83kB Jul25 09) so you can print it and try them on your own.
You have recently purchased land around Pioneer Ridge (on the map above). You plan to build a ski resort and need to decide where to build your lodge. You have chosen two sites that have the aspects you want for your lodge (a view of the river and proximity to some nice steep (double diamond) slopes. You know that avalanches are most likely to happen on slopes that are 60-100%, so you need to know which of the sites will be less likely to be buried in an avalanche. Use the information on the map to calculate % slope and then decide which site is more realistic for your lodge.

Water Table

You are working in an area with an important aquifer that has been contaminated by a buried tank. You need to know the slope of the water table so that you can calculate how quickly the contaminants will get to the nearby wells. You measure the depth to water in two wells: Well A has water at 649 m elevation. Well B has water at 937 m elevation. The two wells are 0.7 km apart. What is the slope of the water table (in m/m)?

Next Steps

If you feel comfortable with calculating slopes, you can go on to the assessment
Remember, you can only take this assessment once, so make sure you're ready!