The Spanish element in Texas water law is a matter of utmost importance to many landholders whose livelihood is dependent on securing water for irrigation and to many communities particularly concerned about water supply.

Titles to some 280,000 acres of Texas land originated in grants made by the Crown of Spain or by the Republic of Mexico. For these lands, the prevailing law, even today, is the Hispanic American civil law. Thus the question of determining just what water rights were granted by the Spanish Crown in disposing of lands in Texas is more than a matter of historical...