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Consideration is given to the costs in terms of regional income likely to be lost if irrigated acreages were to be reduced in the Upper Main Stem subbasin of the Colorado River as a means of freeing water for alternative uses and reducing salt loadings. The cost estimates, known to be biased upward, appear competitive with other water augmentation and salinity reduction programs. Published in Water Resources Research, volume 10, issue 5, on pages 893 - 897, in 1974.
The significance of soil water redistribution facilitated by roots (an extension of "hydraulic lift", here termed hydraulic redistribution) was assessed for a stand of Artemisia tridentata using measurements and a simulation model. The model incorporated water movement within the soil via unsaturated flow and hydraulic redistribution and soil water loss from transpiration. The model used Buckingham-Darcy's law for unsaturated flow while hydraulic redistribution was developed as a function of the distribution of active roots, root conductance for water, and relative soil-root (rhizosphere) conductance for water. Simulations were conducted to compare model predictions with time courses of soil water potential at several...

    map background search result map search result map Hydraulic redistribution in a stand of Artemisia tridentata: evaluation of benefits to transpiration assessed with a simulation model