The route of the Guil river follows that of the Queyras valley over a length of 82.8 miles (51.5 kilometers) with an average slope of 2.4 % that can locally exceed 6 %. Fed throughout their journey by 179 torrents and tributaries, the Guil's waters swell and reach an average flow of around 10m3/second with an increase between May and July linked to snowmelt, rising temperatures, and spring rainfalls. The power of the torrent then rejoices the white water sports enthusiasts and explains the construction between 1979 and 1982 of the Maison du Roi dam.