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Paper no. 9
SYSTEMS DYNAMICS MODELLING OF THE SUSTAINABLE WATER MANAGEMENT SYSTEM OF DANAO CITY
WATER WORKS
Author: Castilla, Delfa G.
Presenter: Engr. Delfa G. Castilla (delfa.castilla@ctu.edu.ph), Cebu Technological University – Danao Campus

This study employed system dynamics modeling to evaluate the sustainability and operational efficiency of
Danao City Water Works, focusing on the interaction between population growth, water demand, and supply.
The analysis covers data from 2019 to 2033, highlighting a significant population increase from 152,351 to
227,605, which drives a rise in household water demand from 1,084,358 m³ to 1,619,979 m³. Additionally, the
introduction of industrial and agricultural water demands contributes to a total water demand surge to
3,658,958 m³ by 2033. The study also observed a dramatic increase in precipitation, leading to a rise in total
water supply from 3,545,689 m³ in 2019 to 7,162,778 m³ by 2033. Despite the increased supply, the findings
reveal a growing oversupply, with surplus water expanding from 636,331 m³ to 898,048 m³. This indicates
potential inefficiencies in the current water management system. The substantial investment of Php
20,155,462.39 in infrastructure underscores the importance of optimizing performance and reducing wastage.
The need for scalable infrastructure to accommodate rising demand, adaptive management strategies to handle
climate variability, and increased community engagement in water conservation. The study concludes that
targeted policy interventions and enhanced resource management are crucial for achieving sustainable water
management in Danao City. By addressing identified inefficiencies and leveraging modeling insights, the city can
better align its water management practices with future demands and sustainability goals.
Keywords: Operational Efficiency, Precipitation, Population Growth, Sustainability, Water Demand, Water Supply
| Domain: System Dynamics

Paper no. 10
CLEANER PRODUCTION ASSESSMENT ON THE SELECTED COFFEE PROCESSORS IN THE
PROVINCE OF CAVITE
Authors: Duray, Megan Vern G.; Gaid, Jules R.; Castillo, Gerry M.; Taguian, Geri
Presenter: Engr. Gerry M. Castillo (geboycastillo@cvsu.edu.ph), Cavite State University

This study assesses the cleaner production practices of selected coffee processors in Cavite using the
cleaner production assessment framework provided by the Department of Science and Technology (DOST).
Five processors participated in the study, with data gathered through interviews and questionnaires to
understand their current systems. The findings are presented through process flow diagrams, flow charts,
and tabulated perceived levels. Key issues identified include lack of incentive programs for good
housekeeping, inefficient raw material inventory, excessive transfer distances, product rejects, spills,
emissions, material waste, and absence of air pollution control devices. These issues were analyzed using
the "five whys" technique to identify root causes. Cleaner production (CP) targets and options were
formulated to address these problems. The study concludes with the development of a cleaner production
framework that integrates CP technologies, targets, and options, demonstrating that cleaner production can
maximize resources, reduce waste and emissions, and effectively address the identified challenges.
Keywords: Cleaner Production, Coffee Processors, Coffee By-products, CP Target, CP Option | Domain:
Operations Management

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