Ice jam profiling on the Hay River, NWT (Canada), April 24, 2005
Measuring an ice jam profile “the hard way” with rod and level, and hard earned benchmarks. Nowadays we use a real time kinematic global positioning system (RTK GPS) for this job.
(photo by Robyn Andrishak, UofA River Ice Group: Canon PowerShot S70, f/7.1, FL 6 mm, 1/1000 sec. exposure)