What I have done
Arduino based low cost remote stream gauge see presentation[(http://docbox.flint.com/~flint/strembot_presentation/img0.html)
My attempt and results
Questions and next steps
Breakthrough is getting good resolution out of depth sensor strip. follow progress on http://strembot.org/ tiddlewiki
Why I'm interested
NOAA and USGS are closing gauge houses nationally. We need to know the water depth and be able to deprive flow from this data.