I would like to give my special thanks to my family members, friends, relatives and mentors Prof. Dr. Gokarna Bahadur Motra and Dr. Suman Narsing Rajbhadari. I am specially thankful to Tara Nath Sapkota ( M.D. of High Himalaya Hydro Construction Pvt. Ltd.) who has provided me with the opportunity to carry out my both official works as well as my study.The encouragement from above people have let to finish my thesis work in time with good remarks and...