noun
irrigation works; water utilization construction
Refers to construction projects for utilizing water resources, especially irrigation.
この地域では利水工事が進められている。
Irrigation works are being carried out in this area.
灌漑 specifically means irrigation, while 利水工事 refers to the construction works for water utilization, which may include irrigation but also other water projects.
Compound of 利水 (water utilization) and 工事 (construction).