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in December 1934. In January 1935, the commissioners met again, but they were still too far apart. Instead of agreeing on a compact, they recommended that the temporary compact be extended. On December 3, 1935, following the announcement of the Presidential embargo, the three commissioners and representatives of the National Resources Committee entered into an agreement under which a joint investigation would be made to determine the present and potential land and water resources of the upper Rio Grande basin and other factual data that might be helpful in understanding the problems in the three states and used in effecting an equitable apportionment of the river. This joint investigation, which is officially known as the Rio Grande Joint Investigation, was conducted in 1936 and part of 1937 with the final report being submitted to the commissioners for the three states in June 1937. It provided factual data that three states used in subsequent compact negotiations. After the completion of the Rio Grande Joint Investigation, additional meetings of the Rio Grande Compact Commission were held. The Rio Grande Compact was finalized and signed by the Commissioners on March 3, 1938. It was ratified by the legislatures of the three states and approved by Congress in 1939. The Rio Grande ComDact of 1938. The positions of the states entering the negotiations were summarized by Hill (1968, pp. 15-18). Although they had different reasons for apportioning the river, all three agreed that the water supply was barely sufficient to satisfy existing uses and felt that the protection of these uses was essential. In addition, Colorado wanted to be able to construct and operate reservoirs to regulate the water supply that was already being used so that it would be more parallel to the crop irrigation requirements. New Mexico felt that the Rio Grande Project lands should be treated together and not separated by state. It also wanted to operate the Middle Rio Grande Project to provide flood control in the Middle Valley, and to obtain approval for a transmountain diversion from the San Juan River in Colorado to the Rio Chama in New Mexico. Texas was concerned about protecting the water supply for the Rio Grande Project with the concern extending to its quality as well as its quantity. In general, the obligations of Colorado and New Mexico to deliver water are established through the use of delivery schedules that specify the annual delivery requirements at downstream locations (for Colorado it is at the Colorado-New Mexico State Line and for New Mexico it is at Elephant Butte Reservoir) as a portion of the annual inflow into the relevant portions of the basin. These delivery schedules were developed from the inflow-outflow 3-9 ('.~ '(~ c).., ....1 \0.' oJ ~w