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THESIS HYDRAULIC ANALYSIS AND DOUBLE MASS CURVES OF THE MIDDLE RIO GRANDE FROM COCHITI TO SAN MARCIAL NEW MEXICO Submitted by Jason M Albert Department of Civil Engineering In partial fulfillment of the requirements For the Degree of Master of Science Colorado State University Fort Collins Colorado Fall 2004 COLORADO STATE UNIVERSITY August 30 2004 WE HEREBY RECOMMEND THAT THE THESIS PREPARED UNDER OUR SUPERVISION BY JASON M ALBERT ENTITLED HYDRAULIC ANALYSIS AND DOUBLE MASS CURVES OF THE MIDDLE RIO GRANDE FROM COCHITI TO SAN MARCIAL NEW MEXICO BE ACCEPTED AS FULFILLING IN PART REQUIREMENTS FOR THE DEGREE OF MASTER OF SCIENCE Committee on Graduate Work Adviser Department Head ii ABSTRACT OF THESIS HYDRAULIC ANALYSIS AND DOUBLE MASS CURVES OF THE MIDDLE RIO GRANDE FROM COCHITI TO SAN MARCIAL NEW MEXICO The Middle Rio Grande located in Central New Mexico is one of the most historically documented rivers in the United States Since the early 20th century regulatory agencies have been interested and concerned with its management A Hydraulic Modeling Analysis HMA of the Corrales reach located 34 miles downstream of Cochiti Dam was conducted An extensive collection of data was used to determine the temporal and spatial changes in the channel General trends for the Corrales Reach include a decrease in width width to depth ratio energy grade line slope and wetted perimeter and an increase in mean velocity and depth during the 1962 2001 time period The reach degraded as much as 3 feet in some areas during this same time period while the sinuosity remained the same Since 1918 the width of the reach decreased from 1275 feet to 474 ft in 2001 Bed material coarsened from Cochiti Dam to just upstream of Albuquerque and the bed is expected to armor in the near future due to the lack of incoming sediment A Double Mass Analysis DMA was also conducted on the Albuquerque Reach of the Middle Rio Grande Data from four gaging stations Albuquerque Bernardo San Acacia and San Marcial were



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