The experimental basin of the ERVH is located in south-central Chile, in the Ñuble Region, at latitude 36.9°S and covers an elevation range of 1,600 – 2,500 masl.

The basin is located on the southwestern slope of the Nevados de Chillán volcanic complex, in the Valle de las Trancas sector, a sector of great tourist attraction.

The ERVH experimental basin has two hydrometeorological monitoring points “Main AWS” and “North facing AWS”, a fluviometric control point “ERVH Gauge Station” and 4 snow transects “Snow transects”.

This station is located in the lower part of the catchment in a large clearing in the forest, and has the following instrumentation:

• Wind speed and direction Net shortwave and longwave radiation
• Snow depth
• Air temperature and humidity
• Soil temperature and volumetric water content (2 depths)
• Precipitation (non-operational)
• Snow water equivalent (non-operational)

This station is composed of two observation nodes, one under the tree canopy (‘Under Cpy’) and the other in a small adjacent clearing (‘Open’).

• Incident shortwave radiation
• Air humidity and temperature
• Temperature and volumetric soil water content (3 depths)
• Snow depth
• Tree trunk growth (x3)

Snow routes with snow depth and snow density using snow probe, had Monterrosa and snow calicatas are performed at 4 points: north and south face, and under the tree canopy and in clearings. Monthly frequency.

These transects have been complemented with timelapse cameras and graduated stakes.

Fluvometric control station with gauges, pressure sensors and a ruler.