Introductory technical guidance for civil engineers and other professional engineers and construction managers interested in planning of hydroelectric power plants. Here is what is discussed: 1. INTRODUCTION, 2. PROCEDURE FOR SIZING POWERPLANTS, 3. POWER SYSTEM REQUIREMENTS AND MARKETABILITY CONSIDERATIONS., 4. PHYSICAL CONSTRAINTS, 5. ENVIRONMENTAL AND NON-POWER OPERATING CONSTRAINTS, 6. SELECTION OF ALTERNATIVE POWER INSTALLATIONS, 7. DEPENDABLE CAPACITY, 8. INTERMITTENT CAPACITY, 9. FLEXIBILITY, 10. MEASURES FOR FIRMING UP PEAKING CAPACITY, 11. HOURLY OPERATION STUDIES.