Ua General works
Ub Soil mechanics
Uc Foundation engineering
Ud Soil engineering. Rock construction
Ue Underground buildings. Tunnels
Uf Piping
Ug Bridge construction
Uh Transportation engineering. Transportation planning
Ui Railway traffic. Railway construction
Uj Shipping
Uk Road traffic. Highway engineering
Ul Air traffic. Airports.
Um Water resources engineering. Hydraulic engineering in general
Un Structural hydraulic engineering
Uo Agricultural hydraulic engineering. Rural management engineering
Ur Water supply and sanitation management
Us Water service
Ut Municipal sewerage. Sewage treatment
Uv Waste management
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