Revision History for TECHNIQUES AND METHODS 6-A31 S.M. Westenbroek, V.A. Kelson, W.R. Dripps, R.J. Hunt, and K.R. Bradbury SWB—A Modified Thornthwaite-Mather Soil-Water-Balance Code for Estimating Groundwater Recharge ----------------------------------------------------- Posted online July 2010 ----------------------------------------------------- Revised and reposted March 14, 2012 Web page has been modified to include a link to the Soil-Water-Balance Overview Web page.