WebApr 10, 2024 · The Federal Highway Administration document "Highways in the River Environment - Hydraulic and Environmental Design Considerations" was first published in … WebNov 7, 2024 · Stream Stability at Highway Structures Fourth Edition. This document provides guidelines for identifying stream instability problems at highway stream crossings. It is an update of the third edition published in 2001. The HEC-20 manual covers geomorphic and hydraulic factors that affect stream stability and provides a step-by-step analysis ...
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