DPWH-LLDA tie up for Marikina River improvement

Published December 19, 2021, 10:53 AM

by Waylon Galvez

Officials of the Department of Public Works and Highways (DPWH) have partnered with the Laguna Lake Development Authority (LLDA) for the improvement of both the lower and middle portions of the Marikina River.

The agreement, signed by DPWH Undersecretary Emil K. Sadain, also the Chief Implementer of the Build Build Build program of the government, LLDA General Manager Jaime C. Medina, and Toyo Construction Co. Ltd. Project Manager Ryuta A. Ariyoshi, will allow the DPWH to use a parcel of land along shore land of Laguna de Bay in Taytay, Rizal as a backfilling site as the department starts working on Marikina River.

The area is a 30.04-hectare property in Barangay Sta. Ana, Taytay, Rizal.

It will be used as a disposal area for materials taken from the dredging and excavation of waterways covered by Marikina River Improvement Works of the Pasig-Marikina River Channel Improvement Project (PMRCIP), Phase IV.

The PMRCIP Phase 4 is also included in the list of government’s infrastructure flagship projects that is funded by a loan agreement with the Japan International Cooperation Agency (JICA) to further mitigate flooding due to overflow of Pasig and Marikina Rivers.

DPWH Acting Secretary Roger G. Mercado, Sadain, Ambassador of Japan to the Philippines Kazuhiko Koshikawa, JICA chief representative Eigo Azukizawa, and other officials and representatives of local government units and partners in the national government agencies officially launched the project last Nov. 16 during as groundbreaking ceremony.

According to Sadain, the MOA with LLDA – having the regulatory function and jurisdiction over the entire Laguna de Bay – is intended to support the department’s project requirement for proper disposal within the period of four years.

The area in Barangay Sta. Ana was identified as an ideal backfilling site for materials taken from the dredging and excavation of the river bank and waterway, which in turn would benefit LLDA as the offered land would be improved and mitigate inundation

As contractor, Toyo Construction, upon securing the required permits and clearances from LLDA and other appropriate government agencies and LGUs, is expected to follow the strict environmental compliance in handling the operation of hauling and disposal of the dredged material to the disposal site.

PMRCIP Phase 4 will cover structural and non-structural measures, which will mitigate flood damages in Metro Manila caused by channel overflow of the Pasig and Marikina rivers.

Scopes of work under this phase include channel improvement works for 7.95-kilometer stretch of Lower and Middle Marikina River, including the construction of Manggahan Control Gate Structure (MCGS), and construction of one floodgate and one sluicegate at the joining sections of Cainta and Taytay rivers to Manggahan Floodway, respectively.

The river improvement works will require excavation and dredging works of about two million cubic meters, steel sheet pile revetment stretching 11.6 kilometers, and reinforced concrete flood wall along its 6.1-kilometer section.

Drainage improvement will also be undertaken which covers the construction of reinforced concrete pipe in 116 locations, manhole in 253 locations, collector pipes, and flap gates in 102 locations.

The Manggahan Control Gate Structure will be constructed 600 meters downstream from diversion point of Manggahan Floodway while the Cainta Floodgate and Taytay Sluicegate will be at the joining sections of Cainta and Taytay Rivers to the Manggahan Floodway Roller Gate.

Also present during the agreement signing were DPWH Unified Project Management Office (UPMO) Flood Control Management Cluster Project Director Ramon A. Arriola III, LLDA Assistant General Manager Generoso M. Dungo, and Toyo Construction Site Manager Tákao Hayase.