The community of Lake Ranco has numerous streams, which belong to the Andean sector of the watershed of the Rio Bueno, Andean valley with 17 210 km ² with a distance of 130 km east-west. The river Well get as many tributaries from the south bank by presenting a high rainfall regime and shows characteristics rushing mountain range with nival.1 The river system is good natural drainage of Lake Ranco which is 443 km ² to 69 m and 199 m maximum depth, characterized by being the second largest lake in area within the territory of Lake Ranco nacional.1 fall in water from Lake Maihue with an area of 49 km ² and Huishue, which lie north of Caulle cord. Also drains into Lake Ranco Riñinahue River, which rises near the Nevada Mountains, close to the limits of the National Park Puyehue.