Economic Viability Assessment of Rainwater Harvesting System for Meeting Non-Potable Water Demands in Metro Manila

Armi C. Yabut¹ , Florante D. Poso Jr.² , Mary Rosetem S. Amorganda³ , Esteven John B. Buduan⁴ , Airah Nicole O. Galang⁵ , Sofia Joy F. Galicia⁶ , Averene Pearl Mateo⁷

Section:Research Paper, Product Type: Journal-Paper
Vol.8 , Issue.2 , pp.1-7, Jun-2021

Online published on Jun 30, 2021

Copyright © Armi C. Yabut, Florante D. Poso Jr., Mary Rosetem S. Amorganda, Esteven John B. Buduan, Airah Nicole O. Galang, Sofia Joy F. Galicia, Averene Pearl Mateo . This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.
 

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Abstract :
Rainwater Harvesting has its reputation growing worldwide as it is one of the most promising solution to water stress, such as the drought in Australia and groundwater contamination in Cambodia. The success of its installation and execution requires extensive planning and a large sum of money. It is critical to determine if it is a viable project, therefore, conducting an economic viability assessment is highly beneficial. Fixed and variable parameters were determined and combined to create a 12-scenario hydraulic and financial model. The researchers gathered these parameters data input through conducted online surveys for the actual household conditions and the costs of materials for the RWHS components were estimated online. These gathered parameters data were processed, modelled, and simulated using a spreadsheet-based modelling software, RainCycle Advanced 2.0. In the 65-year simulation of multiple scenarios with limited catchment areas, the results revealed negative savings and no payback period, as well as an indirect relationship between the water demand met and the number of occupants. The findings indicate that in ideal circumstances, a maximum savings of 121,000 Php can be achieved, demonstrating RWHS`s potential. No payback period was obtained due to the inexpensive mains-water cost matched against a very costly upfront spending in the RWHS components. However, it is still important to initiate measures to encourage practices of saving water therefore, a subsidy program for RWHS installations should be explored by the government and the water concessionaires.

Key-Words / Index Term :
Rainwater Harvesting, Economic Viability, Water Deman, Raniwater, Metro Manila

References :
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