We thank HydroGeologic Inc. for providing us with a beta version of the modhms model and Dr. Don L. Suarez (George E. Brown, Jr., Salinity Laboratory) for providing us with the unsatchem
software. Our work has greatly benefited from insights by Kerry Arroues
(Natural Resources Conservation Service) regarding soil salinization in
the San Joaquin Valley. We thank Drs. Peter Vaughan, Dennis Corwin
(both from George E. Brown, Jr., Salinity Laboratory), and Jim Ayars
(U.S. Department of Agriculture Water Management Laboratory) for
providing us with the irrigation/drainage and groundwater data for the
Broadview Water District, without which some of the evaluation results
would not have been possible. We also thank Gordon Huntington for
providing us with the 1969 soil salinity map and Charles Brush (U.S.
Geological Survey) for providing us with water delivery data. This work
was supported by U.S. Department of Agriculture Funds for Rural America
Project 97-362000-5263 and by the U.S. Bureau of Reclamation. J.A.V.
was supported by the Earth Life Sciences and Research Council with
financial aid from the Netherlands Organization for Scientific
‡ To whom correspondence should be addressed. E-mail: [email protected].
† Present address: Stanford University, Stanford, CA 94305.
contributions: G.S., J.W.H., W.W.W., and K.K.T. designed research; G.S.
and C.A.Y. performed research; J.A.V. and S.P. contributed new
reagents/analytic tools; G.S., J.W.H., C.A.Y., J.A.V., and K.K.T.
analyzed data; and G.S. and J.W.H. wrote the paper.
Abbreviations: ha, hectares; Mton, million tons; RZ, root zone.