IRRIGATION PROJECTS THREATENED BY SAND AND GRAVEL QUARRY SITES
NIA Central Office – The National Irrigation Administration (NIA) infrastructure projects are being threatened by sand and gravel quarry sites. These operate too close to irrigation facilities and structures leading to the adverse effects of excessive quarrying activities such as exposed foundation of said structures, scoured riverbanks, and degraded river beds.
In Region XI, the Padada River Irrigation System located in Hagonoy, Davao Del Sur is experiencing the effect of quarrying activities adjacent to it. Diversion dam of Padada RIS suffers severe damages and exposed sheet piles threatening the foundation of the dam due to severe erosion apparently caused by the quarrying operations downstream. Also, the relocated diversion dam of Sta. Cruz River Irrigation System situated in Liliw, Laguna under NIA Region IV-A is being threatened again by severe erosion due to quarrying operations downstream. This after the original dam about 800 meters downstream was totally damaged in 2006. These are not isolated cases but rather are a nationwide occurrence. Based on the initial inventory by NIA, there are 116 irrigation systems/projects affected by quarrying activities nationwide.