Been awhile, but finally got back down to help survey the Delta River at Black Rapids for my friend Mike's project. While in the past we used traditional survey methods (attaching the boat to a cable stretched across the river, then using a mechanical meter and sounding weight to measure flow), we often had difficulties (Busted...6/13/10). So now Mike has an acoustical doppler meter. It uses a sonar-like application for depth and velocity and GPS for position, so there's no need to stretch a cable, often the most difficult part of the survey. It's so easy, it's almost fun; once the unit is calibrated, you just cruise slowly back and forth across the river until you get a reproducible, verifiable survey. Technology can be pretty cool.
Picked a fine day for the trip.
Mike calibrating the doppler meter.
Finishing up the notes afterwards. The doppler transmits the data to an electronic note.pad