TVIRD and Siocon LGU Repair Pisawak Spillway TVIRD and Siocon LGU Repair Pisawak Spillway Editor March 7, 2014 0 Reconnecting Siocon. TVIRD Civil Engineering Services personnel commence the restoration of the damaged Pisawak Spillway after massive... Read More Read more about TVIRD and Siocon LGU Repair Pisawak Spillway