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The Mines and Geosciences Bureau Regional Office No. VIII conducted a two-day training-workshop on estimation of Sand and Gravel reserve and replenishment rate on April 29-30, 2021.

The training-workshop was aimed at presenting and discussing options on the suggested methodology by the Central Office on estimates for SAG reserves and Replenishment Rates in relation to requests submitted for quarry permit applications in Region 8. In a virtual meeting held on March 10, 2021, MGB-CO encouraged regional offices to come up with an interim methodology which is technically simple, doable and generally applicable given the need to have a standard guide in estimating SAG/Sediment rate of replenishment applicable to respective regions.

The first day of the training-workshop focused on lectures of suggested methodologies which included the following: 1). ArcGIS Cut and Fill method introduced by Lands Geology Information Management System (LGIMS) – Central Office; 2.) Hydrological-Hydraulics Engineering approach (as recommended by Dr. Ray Quebral); and 3). Modified Universal Soil Loss Equation (MUSLE) and YANG’s Equation (being used by GSD-MIMAROPA).

The second day activities of the training-workshop included fieldwork, data gathering and interpretation. The participants visited the permit areas of Rainier Mancera where there is active sand and gravel operation and Kinjap Rock Industries Corp., both located in Binahaan River, Pastrana, Leyte. 

The participants in the said training-workshop are expected to submit an output sample computation of replenishment rate.