Also have a look at this: same purpose, same approach, different system - used in riverbeds and low flow systems - http://www.oryonwatermill.com/
Published by Stefan J. Flos, waterTv.nl - Consultant - Managing Director at SJF projects & support / h2video.nl
Also have a look at this: same purpose, same approach, different system - used in riverbeds and low flow systems - http://www.oryonwatermill.com/