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Sacramento Metropolitan Area, California Reconnaissance Report

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The primary objectives of this study are to identify the level of flood protection provided by existing projects in the Sacramento metropolitan area not included in the American River Watershed Investigation, identify potential alternatives to increase that level of flood protection, and determine whether it is appropriate to proceed into feasibility studies. The study area includes the developed areas along the Sacramento River and Yolo Bypass from the Fremont Weir downstream to an area just south of Freeport. In February 1986, major storms in northern California caused record flood lows in the Sacramento River Flood Control System. Based on flood emergency operations, levee embankment erosion and peak flood stage observations, the study area is at great risk from levee failure and overtopping during similar or larger flood events. estimated residential, commercial and industrial damages could be as high as 1 billion and because of sudden or unexpected levee failure there is a potential for loss of life. The alternatives that were evaluated to increase the level of flood protection include modifying Fremont Weir and Yolo Bypass, modifying Sacramento Weir and Bypass, diverting floodwaters into the Sacramento River Deep Water Ship Channel, modifying levees around West Sacramento, and removing flow constrictions from the Yolo Bypass. Study results indicate that modifications to Fremont Weir and Yolo Bypass and levee improvements for the West Sacramento area are economically feasible. Also, modifications to the Sacramento Weir could be potentially feasible and warrant further study. The Reclamation Board State of California has indicated their support for pursuing feasibility level studies of these alternatives. Based on prior coordination with South Pacific Division, Corps of Engineers, feasibility studies of the Fremont Weir alternative are being transferred to the American River Watershed Investigation.

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  • Hydrology, Limnology and Potamology

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