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<br />B. This course uses two primary sources of material: <br /> <br />Scour - FHWA Hydraulic Engineering Circular (HEC) No, 18, "Evaluating <br />Scour at Bridges," updated 1995, <br /> <br />Stream Stability - FHWA Hydraulic Engineering Circular (HEC) No, 20, <br />"Stream Stability at Highway Structures," updated 1995. <br /> <br />C, In addition, the FHWA Training and Design Manual, "Highways in the River <br />Environment" (abbreviated HIRE) is used as a general reference dl)cument <br />and supporting text for the course. <br /> <br />D. Other important sources of information are referenced when uSE~d in the <br />Workbook, <br /> <br />II. METRIC UNITS <br /> <br />A. The 1995 editions of HEC-18 and HEC-20 and this training course use <br />metric units, exclusively. <br /> <br />B. Supplemenu>-' Module A includes commonly used engineering terms in <br />SI and English units, as well as reference to the metrication appendices of <br />HEC-18 and HEC-20. <br /> <br />1,6 <br />