With the popularization of canyoning as both a sport and leisure activity, a rating system was developed. To make canyons accessible to a wider audience, topographic guides were created to map access points and canyon descents.
In this context, a notation system evaluates several criteria:
V (Verticality): Measures the vertical obstacles in the canyon, such as waterfalls, which require rappelling or climbing techniques to descend.
A (Water): Evaluates water flow, which significantly affects the difficulty of the canyon descent. Water volume influences jump heights, accessibility, obstacle negotiation, and the technical aspect of the descent.
Roman numeral (I–V): Indicates the level of commitment required. Depending on the canyon profile, this considers the canyon’s length, narrowness, openness, and the possibility of exiting before the end.
The V and A values are rated on a scale from 1 to 7, under normal or average conditions. This means a standard water flow, typical accessibility, and a group of about five people with the necessary skills, aiming for a canyon discovery experience.
For example, a canyon might be rated V2/A3/II or 2.3.II, representing levels from very easy to extremely difficult.
Indicative difficulty levels:
Easy: Jumps no higher than 3 meters, and rappel sections shorter than 10 meters.
Intermediate: Jumps 3–5 meters, and rappel sections up to 30 meters.
Difficult: Jumps over 5 meters, rappel sections over 30 meters, with stronger water flow than previous levels.
The overall scale of a canyon descent may also include the total duration of the route, as well as approach and return hikes.