Water & Wastewater Asia November/December 2020

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20 IN THE FIELD For example, if damage to a primary water main would cause loss of pressure, WaterGEMS calculated how much water could be supplied from alternate sources and for how long. This indicated which facilities would have the highest impact on water availability and so required resiliency measures. The modelling also helped the utility to make contingency plans in case of catastrophic losses. The simulations identified the best locations for underground emergency reservoirs to supply evacuation centres and other population centres, if connecting systems were damaged. The masterplan also prioritised facilities whose failure would cause further damage, such as a dam that would cause a catastrophic release of water if it failed. PUBLIC-PRIVATE COLLABORATION Throughout the study and planning process, Manila Water collaborated with local government units and the National Disaster Risk Reduction and Management Council. This ensured that the utility’s masterplan was aligned with each government agency’s plan for emergency response. The WaterGEMS model helped the agencies select the most suitable location for the location of evacuation sites: the visuals created by an overlay of pressure and flow profiles generated by WaterGEMS, on a GIS-based map helped to envision the water supply in relation to population centres. Then, Manila Water used WaterGEMS to ensure these sites would have a secure and reliable water supply in case of a catastrophic event. WaterGEMS produced project cost calculations, supporting documentation, and detailed reports for review by all stakeholders. The plans made clear the risk associated with taking no action, and the rewards of taking measures to ensure access to potable water under different contingencies. The model not only prioritised capital expenditures by criticality of facilities, but also prevented unnecessary expenditures on non-critical facilities. In short, the study helped to determine where to expend resources most economically for the greatest benefit. These were results that stakeholders could embrace. AFFORDABLE RISK REDUCTION According to final RBI study projections, applying the resiliency and contingency measures to the prioritised facilities would decrease damages during a catastrophic event by $380m. The WaterGEMS simulations demonstrated that the proposed measures would significantly reduce property damage and business interruption in Metro Manila and Rizal Province. More importantly, the plan would ensure a stable water supply for Manila Water’s customers. A resiliency and business interruption (RBI) study conducted by Manila Water indicated which facilities would be most vulnerable to calamities Rather than settle for the initial projections, which estimated a recovery cost of $520m paid largely through tariffs, Manila Water found a viable, economical way to minimise damages and provide reliable water service November / December 2020 • waterwastewaterasia.com
IN THE FIELD 21 Bentley’s WaterGEMS software was able to model and simulate operations of the entire water supply system during a calamity. The RBI study and master planning process provided Manila Water with the information required to make prudent decisions. The masterplan’s financial viability gave the utility’s partners and stakeholders confidence that, for a minimal investment, life-saving results could be achieved. Diogenes Adelbert Voltaire B. Evangelista, Water System analysis and planning engineer, Manila Water Company, Inc., said, “Mitigation of the adverse effects of a natural calamity is a race against time. Bentley’s WaterGEMS helped Manila Water minimise the amount of its investment while maximising the resiliency and contingency of its facilities. Both were highly beneficial to the customers it serves. Without this capability, the masterplan would be completed and optimised later rather than sooner.” Project Summary Organisation Manila Water Company, Inc. Solution Water Networks Location National Capital Region, Rizal Province, Philippines Project Objectives • Mitigate the adverse effects of natural disasters on Manila Water customers in the National Capital Region and Rizal Province. • Ensure that there is a reliable water supply during such calamities at an economical cost. • Prioritise resiliency measures and contingency plans for more than 100 facilities. Products used WaterGEMS, Bentley Map Fast facts • WaterGEMS’ criticality analysis helped to prioritise the rehabilitation of facilities. • Hydraulic simulations helped to locate evacuation sites near secure and reliable water supplies. • The simulations identified locations for underground emergency reservoirs near population centres. ROI • Initial estimates predicted it would cost $520m to restore water service after a calamity. • Estimates based on WaterGEMS simulations reduced the cost to restore reliable water service by $380m. • The masterplan saved $30m in insurance costs through the end of Manila Water’s concession period. November / December 2020 • waterwastewaterasia.com
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Water & Wastewater Asia November/December 2020

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