ART of Canyoneering

Details of the ACA Canyon Rating System – the most widely used canyon rating system in the Americas – are available for download in PDF format.

Article by Rich Carlson

There are a number of factors that contribute to the potential for a flash flood. The most obvious factor is the weather, but it is not the only one. You must also consider watershed and potential runoff.

The surface flow of all precipitation is called runoff. The amount of runoff in an area depends on several variables including the amount of precipitation, size of the watershed, surface slope, permeability of surface materials, density of vegetation cover and evaporation rate.

Continue reading