Analysis of transmission phase out options in water supply projects

Abstract

A study on "Analysis of transmission phase out options in water projects" was carried out to analyze possible cost savings to meet any the financial constraints of the project and also to utilize available funds for the benefit maximization through implementation of most customer friendly projects considering the opportunity costs. In order to achieve this target, the TNC water project was selected as a case study and an independent study on duplication of pipe lines were also carried out parallel, to support the analysis. The data required to analyze the transmission system of the TNC project and also to perform the economic analysis on the duplication of pipe lines were collected from the TNC project office, MIS Nihon Sudio consultants I Cey water consultants, NWS&DB and from the University of Moratuwa. The analysis of phase out options of the transmission system of TNC project was carried out by formulating 2 options based on the designs carried out by MIS Nihon Suido consultants. As per the designs carried out by the consultants, the nodal point demands and the bulk demands could be identified separately and the 10th & 20th year demand were rearranged to identify the nodal point demands of each options proposed. Then the "Water CAD" software was used to identify the diameters of transmission lines for the proposed phase out options. The supply and laying costs of DI pipes and specials were calculated and forecasted the future cost figures through reasonable justifications due to abnormal price variations appeared. Then the costs of each transmission line for the proposed options at their implementation stages and the cost of full transmission system were calculated. The present worth of both options was compared with the full transmission cost and the additional funds required for the implementation of both options were then calculated. Based on the above additional fund requirement, the economical interest rates applicable on the decisions of the implementation of each phase out options were calculated. Addition to the above case study analysis, an independent study on pipe line duplication in two different scenarios, theoretical analysis and practical situation based on BS4772 (1988), were also performed and the economically viable diameters of pipe line duplications were identified. Based on the results obtained through both of the studies, the conclusions were made on the economical duplication of pipes in transmission phase out options of water supply projects,