Development of a Groundwater Flow Model for the Colorado River Delta, Mexico

Abstract

The Colorado River Delta (CRD) is a large sedimentary complex located in a structurally controlled basin in an active tectonic region. The CRD lies across the U.S. Mexico international boundary and is traversed by the Colorado River on it's way to the Gulf of California. Multidisciplinary research addressing the impact of the hydrologic change in the CRD has been increasing since the 1980' s. To help expand the base of this know ledge, a groundwater model for the CRD within Mexico was developed. A conceptual model was constructed and transformed within the Department of Defense Groundwater Modeling Software (GMS) into a numerical model using the MODFLOW code made available by the U.S. Geological Survey. Model results indicates that large scale flood events on the Colorado River act as a recharge to the aquifer and show that the relationship between groundwater withdrawals and capture are evident on an seasonal scale.