Posted by: mrmannerz on Jan-06-13 7:41 PM (EST)
I rode along with the USGS guys to check the NF Stillaguamish gauge (western Washington). Every 6 weeks they have to verify it by checking the simple meter stick measurement against the fancy stuff. The realtime gauge uses a tank of nitrogen (housed in a 1930's concrete tower built for the gauge) that pushes a bubble once a minute or so through a submerged tube into the river. The gauge measures the back pressure to determine the river level. The data is transmitted wireless.
Free Standing Boat Racks
Cartop Kayak Carriers
Full Size Sail Rig
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