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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 James & Martin "Fingering" or preferential pathways for percolation often develop in soils that have some water repellency. Sandy soils are especially prone to this abnormal wetting phenomenon. There is a special issue of the Journal of Hydrology, Vol 231-232 which appeared last year in which you'll find much more about current research in this area. With regards Dave Scott ******************************************* Dr David F Scott Forest & Catchments Hydrologist CSIR, Division of Water, Environment and Forestry Technology PO Box 320 7599 Stellenbosch, South Africa. tel. +27 21 888 2407 fax. +27 21 888 2684 e-mail: dscott@csir.co.za ******************************************* >>> <owner-sowacs@aqua.ccwr.ac.za> 21-Mar-01 10:17:02 >>> James Sorry for this late reply. In some of the later papers on fingering flow there were instances of this "fingering" flow developing in relatively uniform sandy soil profiles. Papers were in "Journal Soil Sci Soc Amer" and "Soil Science" around late '80's I think. Perhaps it might be worth following up to see if you soil texture is similarly coarse? regards Martin owner-sowacs@aqua.ccwr.ac.za wrote: > Martin, > > Thanks a lot for your comments. The soil in question is very uniform down > the profile, all the way to the declining water table at 2.5-3.5 > metres. pF curves throughout the profile also indicate a uniform water > holding capacity, so I don't think a difference in texture is the cause of > the problem? > > James > > At 10:11 4/3/01 +0000, you wrote: > > >Hello James > > > >Is this a possible explanation? What you are seeing is simply an interface > >effect, > >at a sharp change of soil texture. There is a good diagram of this effect > >in Don <SNIP>