Water & Wastewater Asia Jul/Aug 2018

WATER & WASTEWATER ASIA July / August 2018 FROM THE GROUND / 19 M anila Water operates t h e c o n c e s s i o n t o p rov i de wa t e r t r ea tmen t , wa t e r d i s t r i b u t i o n , sewerage, and sanitation services to the eastern side of Metropolitan Manila, where there are more than 6 million residential, commercial, and industrial customers. The concession encompasses 24 cities andmunicipalities in a 1,400-square- kilometer area, and Manila Water has a mandate to provide customers with an uninterrupted water supply that complies with national drinking water standards. The company aims to maintain reliable water service during natural disasters, when it is essential for sanitation, hygiene, and preservation of life. The Philippines is threatened by an average of 20 typhoons annually, with 10 making landfall and five reaching superstorm proportions. In 2009, the deadliest season in decades, Typhoon Ketsana left more than 670 dead and US$237 million in damages. The country also suffers at least one destructive earthquake each year. For instance, when the magnitude 7.6 Samar earthquake struck in 2012, it displaced more than one million people and destroyed extensive infrastructure, leaving critical facilities inoperable and disrupting water service. Government hazard assessments predict that the next catastrophic earthquake could cause as many as 34,000 fatalities and disrupt access to drinking water for months. To assess preparedness for such a calamity, Manila Water conducted a Res i l i ency and Business Interruption (RBI) study to determine which of its facilities would be the most vulnerable. The RBI study confirmed that the utility would suffer significant damage to dams, water transmission and distribution pipelines, treatment plants, reservoirs, pump stations, and other facilities. Damage assessments indicated that it would take US$520 million to restore service. The utility concluded that it could not afford to lose these critical facilities and that it would take too long to restore them to full operational capacity. The RBI study suggested high-priority facilities that would need to be made more resilient to minimise damage. Lower priority facilities would require contingency plans in case of their loss. The objective was to mitigate the adverse effects of a natural disaster, ensure a reliable water supply during such calamities, and accomplish these objectives for the most economical cost. Savings would not only benefit the private Located on the Pacific R i n g o f F i r e , t h e Philippines experience frequent disasters that cause ca t as t roph i c losses. Manila Water Company, Inc., prepared a Natural Calamity Risk Resiliency andMitigation Masterplan to ensure that there is a reliable water supply in the event of a natural disaster for the service area covering the East Zone of Metro Mani la ( the Nat ional Capi tal Region) and Rizal Province. Bentley’s Wa t e rGEMS he l ped Manila Water prioritise resiliency measures and contingency plans for more than 100 facilities; r edu c i ng po t e n t i a l l o s s e s b y US $ 3 8 0 million as compared t o US $ 5 2 0 m i l l i o n without such measures.