Hydro 21 Photo Gallery

Non-contact discharge experiment on the Skagit River at Mount Vernon, Washington, April 1999. GPR antenna suspended from cableway; ADCP in boat below cableway.

Surface-velocity and velocity profile data being collected for truth data on the South Fork Shenandoah River, Virginia, during Metratek experiment on March 8, 2000.

Metratek radar systems experiment on the South Fork Shenandoah River, Virginia, experiments. Radar antennas are mounted on the truck. USGS personnel in the river are collecting a velocity profile across the river.

Close-up view of Metratek radar systems used in the South Fork Shenandoah River, Virginia, experiments.

Steve Aichele (in red vest) and the floating GPS units tested by Hydro 21. These drifting buoys have a 12-Volt battery, GPS antenna, and Palmtop computer to log position every second as they float down the river.

Close-up view of buoy with GPS unit inside.

Measuring surface velocity by timing neutrally- buoyant plastic bottles.

Don Hayes measuring slope, South Fork Shenandoah River, Virginia.

10 GHz Radar antenna mounted on van during non-contact experiment at Skagit River.

Detailed velocity profiles being collected on the South Fork, Shenandoah River, Virginia

Radar was mounted below a helicopter as part of a non-contact experiment.

Close-up view of microwave radar antenna mounted under helicopter.