User's guide for RIV2; a package for routing and accounting of river discharge for a modular, three-dimensional, finite-difference, ground- water flow model

Abstract

RIV2 is a package for the U.S. Geological Survey's modular, threedimensional, finite-difference, ground-water flow model developed by M.G. McDonald and A.W. Harbaugh that simulates river-discharge routing. RIV2 replaces RIV1, the original river package used in the model. RIV2 preserves the basic logic of RIV1, but better represents river-discharge routing.