Stream Stability at Highway Structures, Fourth Edition

摘要: This document provides guidelines for identifying stream instability problems at highway crossings. It is an update of the third edition published in 2001. The HEC-20 manual covers geomorphic and hydraulic factors that affect stability a step-by-step analysis procedure evaluation problems. Stream channel classification, reconnaissance techniques, rapid assessment methods are covered detail. Quantitative techniques analysis, including degradation provided, restoration concepts introduced. Significant new material this includes chapters on sediment transport gravel bed streams, as well expanded coverage concepts.