Dear all, I often come across the problem to determine the approximate flow of a river, just to give people an indication of whether their site is worth thinking about hydro power. Of course, the bucket-and-watch method is straightforward, but not really possible above a certain flow. I know the weir method, but building an accurate rectangular weir takes some effort and time. Therefore I am wondering, how accurate is it to use a natural 'weir' for measurement? Usually, you would not have a sharp edge, and often not a vertical fall behind it. I know this affects the accuracy, but by how much? Is it safe to assume e.g. a maximum minus 30% for this? Does anyone have experience with this?
Peter Schneider Ireland email: [EMAIL PROTECTED] [Non-text portions of this message have been removed] ------------------------ Yahoo! Groups Sponsor --------------------~--> Has someone you know been affected by illness or disease? Network for Good is THE place to support health awareness efforts! http://us.click.yahoo.com/RzSHvD/UOnJAA/79vVAA/FGYolB/TM --------------------------------------------------------------------~-> Does your company feature in the microhydro business directory at http://microhydropower.net/directory ? If not, please register free of charge and be exposed to the microhydro community world wide! NOTE: The advertisements in this email are added by Yahoogroups who provides us with free email group services. The microhydro-group does not endorse products or support the advertisements in any way. More information on micro hydropower at http://microhydropower.net To unsubscribe: send empty message to [EMAIL PROTECTED] Yahoo! Groups Links <*> To visit your group on the web, go to: http://groups.yahoo.com/group/microhydro/ <*> To unsubscribe from this group, send an email to: [EMAIL PROTECTED] <*> Your use of Yahoo! Groups is subject to: http://docs.yahoo.com/info/terms/
