S.C.R. No. 13 is a Senate Concurrent Resolution from the Texas Legislature addressing Mexico's failure to meet its water delivery obligations to the United States as outlined in a 1944 treaty. The resolution highlights the critical importance of the Rio Grande as a shared water resource for Texas, which is essential for municipal and agricultural use. It notes that Mexico has consistently fallen short of its treaty obligations, currently being 984,814 acre-feet in arrears, which has led to significant economic and environmental challenges in Texas, including water shortages and increased costs for rural municipalities.

The resolution urges the U.S. Department of State and the International Boundary and Water Commission to take necessary actions to ensure Mexico complies with the treaty and prioritizes water deliveries to the United States during annual allocation discussions. It emphasizes the need for recognition of the socioeconomic implications of the water delivery deficits and calls for proactive measures to address the situation. The resolution was adopted by both the Texas Senate and House, reflecting a strong legislative consensus on the issue.