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I I I I I I I I I I I I I I I I I I I Sacramento River Bank Protection Project Sacramento, American, Yuba, Bear, and Feather Rivers u.s. Army Corps of Engineers, Sacramento District Sacramento, California This project involves the development of criteria for prioritizing bank protection needs in a f1ood- control system that consists of 1,000 miles of levees along the Sacramento River and major tributaries, including overflow relief weirs and bypasses. The evaluation of ecosystem constraints, mitigation requirements, and bank protection/stability guidelines form the basis for the preparation of a Supplemental Design Memorandum for approximately 11,000 lineal feet of bank protection for the initial phase of work on the Lower American River. The development of environmentally sensitive forms of bank protection, including biotechnical stabilization measures and the creation of habitat embayments, has been emphasized throughout. Ayres Associates is responsible for managing a multidisciplinary study team to conduct an EIS/EIR covering both site-specific and programmatic features of the Lower American River portion of the study area. This work has involved extensive coordination with resource agencies, and a broad-based public participation program which includes many different interest groups comprising the Lower American River Task Force. Specific features of the project have utilized 2-dimensional hydrodynamic model studies to accurately define the hydraulic performance of flood relief structures within the 120 square mile Butte Basin. Ayres Associates work elements included hydrographic surveying using GPS techniques, photogrammetric mapping, and development/calibration of the 2-D model. Noteworthy Features of This Job · Digital aerial orthophotography used for topographic mapping in MicroStation-compatible format. · Hard-point embayments provide shaded aquatic habitat for migrating salmon ids, and were hydraulically modeled and designed using 2-dimensional hydrodynamic analysis. · "Minimum-impact, maximum-mitigation" concept was used throughout project design and evaluation of alternatives, including extensive mapping and inventory of existing riparian vegetation. Why is this Job Relevant? · Multi-agency and multi-interest group involvement, including extensive public participation program. · Coordination of hydraulic analyses with upstream reservoir release strategies and their effect on hydrologic routing through the project reach. · Basin-wide approach to flood flow management through a series of levees, overflow weirs, and bypass sloughs was used for accurate determination of flood stage and velocity in environmentally sensitive reaches and in areas where potential river cutoffs could occur.