CH-EC-PH-Ambuklao Dam Tailrace Erosion Protection with MFMII,Rev02 May2015

CASE HISTORY Rev: 02, Issue Date : May 2015 AMBUKLAO DAM TAILRACE EROSION PROTECTION Ambuklao, Bokod, Benguet, Philippines ENVIRONMENTAL / HYDRAULIC / EROSION CONTROL Products: Maccaferri Former Mattress Type II, MacTex Nonwoven Geotextile Problem Ambuklao Hydroelectric Plant is located in the moun- tains of Bokod, Benguet and is about 36 kilometers Northeast of Baguio City. The plant was designed to pro- vide 75MW of energy to the Luzon Grid. When SN Aboitiz Power—Benguet, Inc. took over the operation, they began major rehabilitation and upgrade of the facil- ity. Part of the major rehabilitation was its tailrace—the downstream part of the dam where impound water en- ters the Agno River. The tailrace will be subjected to tur- bulent waters which could result to abrupt damage on the structure. In addition, the tailrace should be finished before the rainy season thus, it requires a rigid erosion protection that can be easily installed whilst it is steady enough to prevent hydrostatic uplift. Solution After careful evaluation of the site conditions, Maccaferri proposed Type II Geotextile Grout Mattress made of woven geotextile to cover the slope of the tailrace, ex- tending onto its base to prevent scouring. A layer of MacTex Nonwoven geotextile was placed between the mattress and and the core of tailrace to act as separator and additional erosion protection. Before Installation June 2010 Project Owner SN-Aboitiz Power — Benguet, Inc. General Contractor McConnell Dowell Philippines Inc. (MCD) Consultant Tonkin & Taylor International Maccaferri Products 17,600 sqm Geotextile Grout Mattress (MFM II) 12,000 sqm MacTex Nonwoven Geotextile Construction Info Start of Construction : June 2010 Completion Date : March 2010 During Construction July 2010 Engineering a Better Solution AMBUKLAO DAM TAILRACE EROSION PROTECTION Ambuklao, Bokod, Benguet, Philippines Project Completed July 2010 Project Completed July July MACCAFERRI (PHILIPPINES), INC. th Unit 30-C, 30 Floor , Rufino Pacific Tower, 6784 Ayala Avenue, Makati City 1226, Philippines Tel. and Fax. (+63-2) 813-0211 E-mail: [email protected] Web site: www.maccaferri.com.ph Engineering a Better Solution AMBUKLAO DAM TAILRACE EROSION PROTECTION Ambuklao, Bokod, Benguet, Philippines During Construction July 2010 During Construction July 2010 MACCAFERRI (PHILIPPINES), INC. th Unit 30-C, 30 Floor , Rufino Pacific Tower, 6784 Ayala Avenue, Makati City 1226, Philippines Tel. and Fax. (+63-2) 813-0211 E-mail: [email protected] Web site: www.maccaferri.com.ph Engineering a Better Solution .

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