Reddy, M M, Schuster, P, Kendall, C, and Reddy, M B, 2006, Reply to comment on "Characterization of surface and ground water δ18O seasonal variation and its use for estimating groundwater residence times" by R.E. Criss, and W.E. Winston: Hydrological Processes, v. 20, iss. 16, p. 3573-3578.