Introductory technical guidance for civil and geotechnical engineers and construction managers interested in cutoff walls for earth and rockfill embankment dams. Here is what is discussed:1. INTRODUCTION2. DEEP SOIL MIXING AND JET GROUTING3. GEOMEMBRANE, SHEET PILE AND SECANT CUTOFF WALLS4. SLURRY TRENCH AND REINFORCED CONCRETE5. SOIL BENTONITE SLURRY TRENCH6. FOUNDATIONS AND ABUTMENTS.