42 Technical studies for the construction and operation of any equipment or apparatus concerning hydraulics, namely, irrigation systems, hydraulic systems, pipelines, plumbing, pumping stations, treatment and purification of liquids, namely, waste water, rainwater, drinking water, systems for decanting these liquids, water supply systems; services for engineering work in the field of water treatment, conveyance and distribution facilities; professional consultancy and drawing up plans unrelated to conducting business in the field of water treatment, supply and distribution installations; scientific laboratory services in the field of water treatment, conveyance and distribution; scientific and technological services, namely, research and design services with resspect to urban planning and development works in the field of water treatment, conveyance and distribution facilities; water analysis; mapping services [geography] in the field of water treatment, conveyance and distribution facilities; design of computer systems in the field of water treatment, conveyance and distribution facilities; advice with respect to energy saving in the field of water treatment, conveyance and distribution facilities; quality control in the field of water treatment, conveyance and distribution faciilities; development [design], installation, maintenance, update and rental of software in the field of water treatment, conveyance and distribution; software as a service [SaaS] in the field of water treatment, conveyance and distribution; construction drafting in the field of water treatment, conveyance and distribution facilities; research and development of new products for others in the field of water treatment, conveyance and distribution facilities; bacteriological and chemical research in the field of water treatment, supply and distribution; environmental protection research in the field of water treatment, conveyance and distribution; technical study and technical design of all facilities with respect to water treatment, recovery, supply and distribution