Mines bureau recommends drainage vs landslide

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Tuesday, May 20, 2014

THE Mines and Geosciences Bureau (MGB)-Davao recommended creating a drainage system on top of the area where a landslide occurred on Shrine Hills to avoid a repeat of the incident.

"Proper drainage should be established on the upper slopes of the landslide mass to divert surface waters and minimized water concentration on the landslide scarp. This is to minimize further movement of the landslide body," Geologist Allen June B. Buenavista of MGB-Davao said in his report.

A copy of the MGB-Davao ocular inspection report states that a landslide that occurred on April 20 was located on top of an old landslide deposit and is in fact "a re-activated landslide."


"The landslide material is composed of a mixture of highly porous, friable, coralline limestone and landstone. Based on the geomorphologic map of Matina Shrine Hills, the landslide is within the SD2 Structural Landform characterized by steep slope and flanks of anticline with active mass movement," the MGB reported.

The MGB said the incident happened in an area already delineated as highly susceptible to landslide based on the Landslide Susceptibility Map of Shrine Hills; thus, becoming a cause of anxiety for residents living below Shrine Hills.

The agency report also recommended that regular monitoring be done by caretakers of the subdivision and the barangay officials.

Environmentalists, on the other hand, urged the local government unit to take immediate steps to prevent another landslide from happening at Shrine Hills as the monsoon season begins.

"With the rainy season starting in June, we can expect more landslides unless re-greening and stabilizing initiatives are immediately conducted," Interface Development Interventions Inc. (Idis) executive director Ann Fuertes said in a statement.

Fuertes said the local government, along with the City Environment and Natural Resources (Cenro), Department of Environment and Natural Resources (DENR) and MGB should pitch in their resources to help stabilize the slopes.

She said the cooperation of the landowner is also important to stop future landslides.

Norma Javellana of the Save Davao Shrine Hills Movement agreed with the MGB recommendation.

"We will push for regular monitoring by the barangay and we will be part of it, but we won't limit it only to Palm Groove West but to all Ma-a site slopes," she said.

"Of course, the overriding city wide advocacy is still to publish and implement the Zoning Ordinance so that Shrine Hills will be officially recognized as an Urban Ecological Enhancement Sub-Zone with a clear IRR on how to start greening stabilizing the area," Javellana said.

Published in the Sun.Star Davao newspaper on May 21, 2014.

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