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<br />INTRODUCTION <br /> <br />Under the Water Treaty of 1944 between the United states and Mexico, <br /> <br />national ownership of waters of the Rio Grande from Fort Quitman to the <br /> <br />Gulf of Mexico is determined from stream flow records on the main river <br /> <br />and on its principal tributaries in both countries. <br /> <br />In order to improve the accuracy of stream gaging, which is subject <br /> <br />to the natural shifting of channel controls and to deposition of sediment <br /> <br />at or near the gage wells, the United states Section of the International <br /> <br />Boundary and Water Commission had tentatively concluded that artificial <br /> <br />controls in the river were desirable. This decision was concurred by a <br /> <br />team of engineers from Colorado State University, Fort Collins, Colorado <br /> <br />who visited several proposed field installation sites at the request of <br /> <br />the United states Section of the International Boundary and Water <br /> <br />Commission. The results and conclusions of the field investigation by <br /> <br />the group are embodied in a report to the Boundary Commission entitled, <br /> <br />"Locating and Designing Structures to Improve stream Gaging Accuracy in <br /> <br />the Rio Grande River Basin," Report No. CER60SSK34, dated June, 1960. <br /> <br />In concurring that artificial controls in the Rio Grande were <br /> <br />desirable, the report further includes general recommendations for the <br /> <br />type and locations of the control structures. Because of many factors <br /> <br />which were unknown at the time of the field investigation, it was <br /> <br />recommended that a model studJ.- be conducted tc provide adequate data for <br /> <br />designing the ~ecommended control structures. <br /> <br />" . .of (' ..... <br />\.J '.' 1" I.; oJ <br />