TA Engineering (General). Civil engineering (General) 90 TJ Mechanical engineering and machinery 10 TD Environmental technology. Sanitary engineering 9 TK Electrical engineering. Electronics Nuclear engineering 7 Environmental science, engineering & technology 4 Floods 4 Water supply & treatment 4 Industrial applications of scientific research & technological innovation 3 Nanostructured materials 3 T Technology (General) 3 TC Hydraulic engineering. Ocean engineering 3 Additives 2 Conservation of the environment 2 Flow velocity 2 Lime 2 Petroleum reservoir engineering 2 Petroleum reservoirs 2 Q Science (General) 2 Reservoirs (water) 2 Shore protection 2 TE Highway engineering. Roads and pavements 2 Vegetation 2 Velocity distribution 2 Ammoniacal nitrogen Artificial neural network Biological oxygen demand Dissolved oxygen Water quality index 1 Anionic surfactants 1 Applied ecology 1 Artificial neural network 1 Automotive exhaust 1 BV/TV 1 Ballast 1