installation of rainwater harvesting systems; installation of rainwater collection systems; installation of rainwater drainage systems; installation of rainwater tanks; installation of irrigation systems; installation of environmental protection systems; installation and repair services for irrigation devices; installation services of pipelines; machinery installation; installation of plumbing; pipeline installation; installation of electric light and power systems; installation and repair of irrigation devices; installation of instrumentation systems; installation of HVAC systems; installation of hydraulic equipment; installation of cellular paging systems; installation and repair of flood protection equipment; installation of water pipes; installation of office machinery; installation and repair services for irrigation systems; installation of water supply apparatus; installation of land irrigation devices; installation of flood protection equipment; installation of environmental control systems; installation and maintenance of irrigation systems; installation of land irrigation systems; installation of plumbing systems