12 December 2022
Safe and Effective Hydraulic Spillway Structure in Zamboanga del Sur
Maccaferri improves mine efficiency and safety while also promoting sustainability. Our experience in water control hydraulic structures, erosion protection, and re-vegetation has also been useful for the rehabilitation of the local environment at the end of the life of the mine, facilitating the return of the in-situ materials to nature and driving down the carbon footprint.
TVI Resource Development (Phils.) Inc., a gold and silver mining company in Sitio Balabag, Barangay Depore, Municipality of Bayog, Zamboanga del Sur, Philippines. needed to construct a hydraulic spillway structure to support the excess runoff from the residual storage impoundment. A practical and economical design of the spillway was required to dissipate the flow and reduce the water velocity downstream.
The spillway structure was built using Maccaferri’s integrated Terramesh® System, reinforced with MacGrid® Geogrids, and gabions. The Terramesh® units were mainly used for the construction of the drop structures and the side walls while the gabions were installed as the lining of the bottom landings of the spillway and as termination of the walls. The Terramesh® System units were reinforced with MacGrid® geogrids, to provide the required tensile mechanical strength of the wall structure. The MacGrid® geogrids used have a tensile strength of 100 kN/m.
The cascading steps and landing portions were capped with concrete for abrasion protection. The top portion of the spillway measures 20m wide and succeeding drop heights vary from 3m to 5m. Both Terramesh® System and gabion units were filled with head-sized boulders which are available on site. MacTex® nonwoven geotextiles were also used to line the rear of the Terramesh® units with a 150 gsm non-woven geotextile (MacTex® MXL35) to prevent migration of the backfill to the spillway structure.
Maccaferri improves mine efficiency and safety while also promoting sustainability. Our experience in water control hydraulic structures, erosion protection, and re-vegetation has also been useful for the rehabilitation of the local environment at the end of the life of the mine, facilitating the return of the in-situ materials to nature and driving down the carbon footprint.
The Contractor, TVI Resource Development (Phils.) Inc., and the Consultant, GHD Philippines, started the construction in January 2022 and completed it in September 2022.
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