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<br /> <br />LOS GATOS CREEK - 1-5 REPLACEMENT BRIDGES <br /> <br />v. GENERAL CONCLUSIONS <br /> <br />A Level 2 analysis results in a quantitative assessment of stream <br />instability and scour, <br /> <br />B. If stream instability exists, a decision is made to either proc:eed to a <br />more detailed Level 3 evaluation, or to complete the design/scour <br />evaluation of the bridge or select and design countermeasures based on <br />Levels 1 and 2 assessment. The FHWA FESWMS and the Corps of <br />Engineers RMA-2V models are available for complex flow situations <br />requiring 2-dimensional modeling (Level 3), <br /> <br />C. For Level 3 water and sediment routing and aggradation/deglradation <br />studies, computer models such as the FHWA BRI-STARS and Corps of <br />Engineers HEC-6 models are available. <br /> <br />D. For very complex problems, physical hydraulic model studies can be <br />completed as a Level 3 analysis. <br /> <br />5.16 <br />