Topographical Surveys Made by the American Section of The International Boundary Commission United States and Mexico

During the winter of 191Q-11, the lnternational Bollndary Commission between the United States and Mexico, of which the writer is Consulting Engineer for the United States and Mr. E. Zayas for Mexico, made a survey of the Rio Grande from Roma to the Gulf of Mexico. This survey covered an area about 140 miles long and from 2 to 3 miles wide, including within its limits the territory which is subject to the erosive action of the river. The purpose of the survey was to obtain data from which a map could be made on a scale of 1 in 5 000, which would be accurate as to general dimensions and the location of fixed points, and would show; within reasonable limits, the location of the topographical features.