This study was carried out by the United States and Mexico in accordance with resolution 6 of Minute 242 of the International Boundary and Water Commission, United States and Mexico (IBWC) entitled “Permanent and Definitive Solution to the International Problem of the Salinity of the Colorado River”, dated August 30, 1973; and the "Joint Report of the Principal Engineers Regarding the Joint Cooperative Process United States - Mexico for the Transboundary Aquifer Assessment Program”, dated August 19, 2009.