Dear Steve:
For the salt dilution method knowledge try contac ITDG by his nice site www.itdg.org. They have a very good Microhydropower Manual, and a lot of interesting books about appropriate technologies. The method is, in brief, as follows: 1) Dilute very well common salt in a bucket (suitable mass of salt selected is related to the estimated flow in the creek or small river); 2) Have a conductivity meter for metering the conductivity in the middle of the current; 3) Throw the salt solution same 50 meters up water in a very turbulent point. 4) Measure conductivity in the place 50 meters down water every 5 seconds, and when salty water comes to the point conductivity became greater than original in the river, then dictate values readed to an assistant in the border writting the values, and when conductivity in the water is no greater than natural one, stop the measurements 5) Draft a graphs in 5 mm squared paper, conductivity in ordinates, vs time. 6) Calculate the area below Gauss curve obtained. 7) The area is proportional to the flow. 8) There is a formula: Q = Q(mass of salt, conductivity area, correction factor for temperature). This method have a very small error, no more than 5%. Kind regards, Carlos E. Bonifetti ---------------------------------------------------------------------------------------------------- www.itdg.org ----- Original Message ----- From: "Steven Schoeffler" <[EMAIL PROTECTED]> To: <[email protected]> Sent: Friday, January 28, 2005 7:27 PM Subject: Re: [microhydro] Measuring stream flow > > > Salt dilution method? Where does one learn about such things? Is there a > good reference that teaches everything about microhydro? > > Thanks. > > Steve > > ----- Original Message ----- > From: Carlos Bonifetti > To: [email protected] > Sent: Friday, January 28, 2005 3:11 PM > Subject: Re: [microhydro] Measuring stream flow > > > > Hi Brendan, Steve, ....: > > For that flow, the salt dilution or current velocity/area measurement > with > floating devices methods are both practical. > > Regards, > > Carlos > > > ----- Original Message ----- > From: "Steven Schoeffler" <[EMAIL PROTECTED]> > To: <[email protected]> > Sent: Friday, January 28, 2005 3:58 PM > Subject: Re: [microhydro] Measuring stream flow > > > > > > > > Please respond to the group.... I'd be interested in this also. > > > > Thanks, > > > > Steve > > > > ----- Original Message ----- > > From: B Fitzgerald > > To: [email protected] > > Sent: Friday, January 28, 2005 8:55 AM > > Subject: [microhydro] Measuring stream flow > > > > > > > > > > Hello Microhydro group, > > I am looking to measure accurately the flow in a stream that I am > > interested in developing. Using the flow prediction by area-rainfall > > method I have calculated that the provisional mean flow is > > approximately 0.25 cubic metres per second. I have investigated a > > number of methods and have decided that a dilution method or a > > velocity-area method utilising a propellor current meter or > > electro-magnetic current meter would be most suitable. (The weir > > method or bucket fill method are not possible in this situation). > > I would like to know if anyone has any information or is selling a > > reliable current meter or indeed if anyone had any tips on evaluating > > the flow of a stream. I will be taking measurements at regular > > intervals over the next 7 to 8 months. > > Thank you all for your time, > > > > Regards, > > Brendan Fitzgerald > > IT Tralee > > > > [Non-text portions of this message have been removed] > > > > > > > > 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 > > > > > > > > ------------------------ Yahoo! Groups Sponsor --------------------~--> In low income neighborhoods, 84% do not own computers. At Network for Good, help bridge the Digital Divide! http://us.click.yahoo.com/EA3HyD/3MnJAA/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/
