This publication provides introductory technical guidance for civil engineers and other professional engineers and scientists interested in reservoir water quality assessment. Here is what is discussed: 1. ESTABLISHING OBJECTIVES 2. DESIGN CONSIDERATIONS 3. ELEMENTS OF ASSESSMENT 4. PREIMPOUNDMENT ASSESSMENT 5. POSTIMPOUNDMENT ASSESSMENT 6. OPERATIONAL MONITORING 7. MODIFICATION OF OPERATIONS 8. MODIFICATION OF WATER CONTROL STRUCTURES 9. SPECIFIC WATER QUALITY PROBLEMS.