Contents preface (VII) introduction 1—37

14.6.2. Feasibility Investigation
The aim of the feasibility investigation is to ascertain the soundness and justification, or lack of these, of different alternative plans chosen after carrying out preliminary investigations. The analyses need to be of high accuracy and dependability so that the reliability of results, on the basis of which the final selection of the project plan is made, may not be questioned. It should, however, be noted that the feasibility investigation does not mean the end of the project planning. Some minor changes are always required to be made for various reasons during final designs before construction, during construction, and even during project operation.

484 IRRIGATION AND WATER RESOURCES ENGINEERING
The first step in the feasibility investigation is to collect or update the basic data of different types. The accuracy and reliability levels of these data must be consistent with the degree of accuracy required for feasibility justifications. The basic data for dams and reservoirs include topographic surveys of sites, information on stream flow and design flood, land costs, reservoir clearing costs, communication facilities, climatic conditions affecting construction, fishery and wildlife to be preserved, construction material, foundation conditions of dam site and reservoir area, availability of trained manpower, and important environmental and other considerations. The facilities and appurtenances necessary for the functioning of the project must be specified, and considered while making feasibility cost estimates.
On the basis of the feasibility investigation, a provisional selection of the site and size of the project is made. Besides, the functions of the project are also decided. The final report prepared on the basis of the feasibility investigations is submitted to the approving and funding authorities of the project.