This Technical Report deals with equipment used to measure water discharge in rivers and channels under ice conditions. It does not specify techniques for measurement and computation which are dealt with in various International Standards. ISO 9196 specifically deals with the methods for the measurement of flow under ice and this Technical Report is intended to be used with ISO 9196. The most common technique for determining flow under ice conditions uses a modified form of the velocity-area method. This Technical Report concentrates on the specialized equipment required for gaining access through the ice sheet and obtaining area, velocity, and other information for determining the rate of flow under ice.