Published 25.02.2021 The ice-measuring rail GR-31 is designed to measure the thickness of the ice cover in reservoirs with a water depth under the ice of at least 0.3 m, as well as to measure the height of the snow cover on the ice.
The ice-size rail consists of a rectangular wooden bar and a thrust bar, fastened to the lower end of the bar at an angle of 60°. The rail has a two-way scale: for measuring the thickness of the ice and for measuring the height of the snow cover. The ice scale is applied after 1 cm.
When measuring the total thickness and depth of immersion of the ice, the slat is carried under the ice through the hole along the current and unfolds across. The thickness of the ice is defined as the arithmetic mean of the two counts.
Measurements of the thickness of the ice and the height of the snow on the ice begin from the moment when the exit to the ice becomes safe. On rivers, the ice thickness is measured in two places, near the shore and in the middle of the river, and on lakes, the ice thickness is measured on the coastal zone and closer to the open part of the reservoir or above the area of the most significant depths.