Contents: Preface. 1. Introduction. 2. Geology. 3. Historical background of the project. 4. Subsurface exploration. 5. Physical properties of rockmass. 6. Studies on reservoir area. 7. Studies for the construction material. 8. River diversion during construction. 9. Construction of Rockfill Dam. 10. Construction of Concrete Dam. 11. Construction of Powerhouse and its appurtenant structures. 12. Tail Race Tunnel and its appurtenances. 13. Post construction problems. 14. References. Annexures: 1. Results of area grouting carried out in Rockfill Dam. 2. Permeability values at different pressures in the Drill hole-14. 3. Permeability values at different pressures in the Drill hole-15. 4. Permeability values at different pressures in the Drill hole-16. 5. Permeability values at different pressures in the Drill hole-17. 6. Permeability values at different pressures in the Drill hole-18. 7. Results of water test and grouting in Block 2 to 26 of Drainage Gallery (Concrete Dam). 8. Details of Cavities/Heavy overbreaks in Shear Zone reaches in Tail Race Tunnel.