EFISIENSI PROYEK NORMALISASI SALURAN SEKUNDER UNTUK DAERAH IRIGASI WADUK GOGOR

Irrigation infrastructure plays a vital role in maintaining national food security. However, irrigation channel normalization projects are often executed without adequate environmental impact assessments, leading to inefficient material and energy use and uncontrolled construction-phase emissions. This study aims to identify the life cycle and quantify the environmental impacts of the secondary channel normalization project at the Gogor Reservoir Irrigation Area (D.I. Waduk Gogor) in Tersebar Village, Balongpanggang District, Gresik Regency, while also assessing material and energy efficiency using the Life Cycle Assessment (LCA) approach. Eight key construction activities were evaluated using the cradle-to-gate LCA method, utilizing SimaPro software and the ReCiPe 2016 Midpoint (H) method. The results show total Global Warming Potential (GWP) emissions of 111,584.80 kg CO₂-eq, a figure well below the 1.85 million threshold set by the Ministry of Environment and Forestry (KLHK). The primary hotspot was the installation of K350 U-Ditch units, which accounted for 54.44% of GWP and 90.6% of fossil energy consumption (109,373.23 MJ). Meanwhile, the demolition of existing stonework generated the highest particulate matter formation (PMF) emissions, at 32.70%. On a positive note, the reuse of 260.71 tons of demolished stone resulted in a saving of 48.07 kg CO₂-eq. Given that the project's energy efficiency is heavily influenced by the U-Ditch installation process, optimization of heavy equipment operation, improvements to the mortar mix design, and the partial replacement of cement with more eco-friendly materials—such as fly ash—are recommended.