I found these two great resources on low head dam
The video shows an amazing demonstration at the power and danger of such dams and hydrolics
http://video.google.com/videoplay?docid ... 9391034920
and this PDF from Indiana. This has historical information as well as very good descriptions and diagrams of low head dams
http://www.rose-hulman.edu/~sutterer/EF ... Report.pdf
Everyone should take a comple of minutes to look over these resouces.
Low Head "Drowning Machine" info
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