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Excerpt from Regional Planning, Vol. 6: The Rio Grande Joint Investigation in the Upper Rio Grande Basin in Colorado, New Mexico, and Texas, 1936-1937 Rio Grande is an interstate and an international stream. It rises in Colorado and flows southward for more than 400 miles across New Mexico. After leav ing New Mexico, it forms the boundary between Texas and the Republic of Mexico for about miles to its mouth. The total length of the river is about miles. With respect to usage of water and the problems concerned with that usage, the river is divided into two distinct sections at Fort Quitman, or at the narrow gorge a few miles below. Above this nearly all the water of the river is being consumed by irrigation in Colorado, New Mexico, Texas, and Mexico. Below, in the lower basin, the river develops its flow mainly from tributaries in Mexico. In the Upper Rio Grande Basin, including parts of Colorado and New Mexico, and a very small part of Texas, more than 99 percent of the water supply comes from Colorado and New Mexico in about equal amounts. In accordance with natural divisions, the upper basin comprises three principal areas: the San Luis section in Colorado, the Middle section in New Mexico, and the Elephant butte-fort Quitman section in New Mexico, Texas, and Mexico. These are indicated on the general map, plate 1. The San Luis section comprises the basin of Rio Grande in Colorado, the principal agricultural area of which is the San Luis Valley. This is a broad plain of smooth topography, surrounded by mountains except on the south near the colorado-new Mexico State line, where the river has cut an outlet for the southern portion of the valley. The northern portion is not thus drained and is known as the Closed Basin. The valley floor ranges in altitude from to feet and the surrounding mountains from to more than feet. About the Publisher Forgotten Books publishes hundreds of thousands of rare and classic books. Find more at www.forgottenbooks.com This book is a reproduction of an important historical work. Forgotten Books uses state-of-the-art technology to digitally reconstruct the work, preserving the original format whilst repairing imperfections present in the aged copy. In rare cases, an imperfection in the original, such as a blemish or missing page, may be replicated in our edition. We do, however, repair the vast majority of imperfections successfully; any imperfections that remain are intentionally left to preserve the state of such historical works.