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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 Yes, there is a single instrument for this. However, its use may not be inexpensive. It is a borehole device that measures heat lost by some 180 separate, vertical wires located on the outer circumference of the device. As the water flows by, the upstream wires cool faster than those downstream. The device was invented, and I believe patented by Dr Joseph Feldkamp while he was in the geotechnical group at Northwestern University. It replaces, the multiple borehole approach to monitoring head differences to determine direction of flow. Dr Feldkamp was working at Trindle Air Force base at the Air Force's center for environmental research, and could be contacted through them or the soil science department at Purdue, from when he received his PhD. Good Luck At 06:14 PM 3/5/2000 GMT, you wrote: >>Dear Bruce, >> I came upon your site while researching underground streams. I live in Park >>Slope, Brooklyn, NY and there are many in the neighborhood. It seems that >>recently one has surfaced under my house in the ground below the basement >>floor. I'd like to install a sump pump, but first, I'd like to be able to >>determine which direction the water is coming from. Is there an electrical >>device or sonar device available to trace the origin of the water? Your >>input would be greatly appreciated. Thank you. >>Regards, >>Trisha >>Reply via e-mail to trisha@brooklynproperties.com >> > > > Charles H Dowding (847) 491 4338 Professor of Civil Engineering (847) 491 4011 FAX Northwestern University http://www.civil.nwu.edu/people/dowding Evanston IL 60208 c-dowding@nwu.edu