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NOTE: To get off this list, send email to majordomo@aqua.ccwr.ac.za with the body of the message containing the line: unsubscribe sowacs Dear Camilo We have had a fair amount of experience with automatically monitoring runoff from erosion plots. It will of course depend on your site, the volumes you are recording, and your budget, but here are a few ideas. 1. Put some kind of depth gauge in your tanks. We have used pressure transducers linked to data loggers, but are currently experimenting with a much cheaper float system (basically the fuel level sensor from a car petrol tank). 2. Use a tipping bucket system, similar to that in a tipping bucket rain gauge, but big enough to cope with the flow. However, probably not suitable where sediment concentrations are high as you get deposition in the buckets. 3. Build a weir or flume and measure the stage automatically in a stilling well, using a float to chart recorder or logger, or a pressure transducer. 4. I have also seen pipe based flow rate monitors used, but have no experience in rigging them up to data loggers although I am sure it can be done. Hope this is of some help John Quinton Please note new FAX number and Institute name ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ Dr John Quinton Head of Landcare Group National Soil Resources Institute Cranfield University Silsoe Bedford MK45 4DT Tel +44 (0)1525 86 32 94 Fax +44(0)1525 86 32 53 mailto:J.Quinton@cranfield.ac.uk http:\www.silsoe.cranfield.ac.uk\nsri The NSRI is a new Institute that will provide research, teaching, training and consultancy in all aspects of the sustainable management of land and soil resources both in the UK and internationally View presentations from the recent meeting on pathogen transport at: <http://www.silsoe.cranfield.ac.uk/iwe/erosion/ciwem_pathogen/>