In 2015, CTII was awarded the contract for Consultancy Services for the Construction Supervision of Flood Risk Management Project for Cagayan, Tagoloan, and Imus Rivers. The project led by Mr. Shuji Kaku as its Project Manager who is also the current Managing Principal of CTII Philippine Branch has completed the major works for Cagayan and Tagoloan Rivers in November and August 2019, respectively, while construction works on Imus River was extended up to October 2021.
The project, which is funded by JICA under its ODA facility and implemented by DPWH, includes construction/completion of Structural Measures and formulation/implementation of Non-Structural Measures (NSM).
I. CAGAYAN RIVER SUB-PROJECT, Province of Cagayan, Region II, Northern Luzon Cagayan River was selected as one of the priority river basins for JICA assistance as a response to the major flood disasters that occurred in 1973, 1980, and 1998 in Cagayan Province. The structural measures constructed by the project include revetment and spur dikes in Cataggaman, Tuguegarao and Alibago, Enrile which helped mitigate flood damages and protect riverbanks from erosion.
II. TAGOLOAN RIVER SUB-PROJECT, Province of Misamis Oriental, Region X, Mindanao Flood control engineering facilities were constructed along Tagaloan River which include flood protection dikes with revetment, innovative drainage canal with geo-tube, net gabion and sand filled mattresses and sluiceways with flexible joints. The structural measures consisting of new technologies from Japan are constructed to mitigate adverse flood impacts that historically claimed lives and caused damages to properties. With the completed project components such as flood protection dike, drainage improvement, and drainage sluiceway, the capabilities of LGUs and local communities on flood risk management were strengthened towards sustaining the socio-economic development of the Municipality of Tagaloan, Misamis Oriental.
III. IMUS RIVER SUB-PROJECT, Province of Cavite, Region IV, Luzon
The low-lying area along the lower part of Imus River has been rapidly urbanized due to its close location to Metro Manila, even though it is geographically considered as flood-prone areas. According to the Flood Management Master Plan for Imus River, the installation of three (3) Retarding Basins is given high priority including the river channel improvement in the lower Imus River and two major tributaries, Bacoor and Julian Rivers. The Construction of two (2) Retarding Basins namely: Imus and Bacoor Retarding Basins was selected among the three proposed locations in the Master Plan as Sub-Project of FRIMP to reduce the flood peak discharges by temporarily retarding the flood run-off in the off-site retarding basins.
Non-Structural Measures (NSM)
The non-structural measures, on the other hand, are aimed at reducing the vulnerability of the affected community residents to flood hazards. The NSM activities were planned and implemented in coordination with the Local Disaster Risk Reduction and Management Office (LDRRMO) of the target LGUs at the sub-project sites and the relevant government agencies such as the DOST-PAGASA and the Office of Civil Defense (OCD) at the national and regional levels. These activities included the conduct of QGIS Tutorials to update the local base maps, preparation and updating of flood susceptibility and spot maps, flood mapping and timeline survey after every major flood event, flood signages, assessment of evacuation centers, and conduct of IEC campaigns and flood drills for local officials, residents, and schoolchildren. A Flood Mitigation Committee (FMC), a coordination body, was also formed in each of the three (3) sub-project sites (Cagayan, Tagoloan, and Imus) to assist in handling issues and other concerns related to the Project’s pre-construction, construction, and post-construction stages. The conduct of quarterly FMC meetings is envisioned to help ensure the sustainability of the Project’s structural and non-structural measures in its O&M Stage.