Video cameras don't see through rain very well, so there are times when that will be an issue for the serious WW crowd. Camera's will also need to be mounted high enough that a flood stage river will not take them out (rivers rising 20 to 30 feet is not uncommon). Gauges will also need to be on the downstream side of bridges where logs do not pile up.
I have also heard rumor of using terrain maps and rainfall data to predict flow. Other factors would also need to be considered for any chance at accuracy -- ground saturation, underground pools, and such are obviously important in some areas.
Kayak Kaboose Trailer
Gedi Convertible Helmet
Full Size Sail Rig
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