1 Scope
2 Purpose
3 Construction
3.1 General
3.2 Use of machinery
3.3 Pipe drainage with trench excavation
3.3.1 Preparation of drain trenches
3.3.2 Laying of drain pipes
3.3.3 Security of the position of pipes
3.3.4 Filters
3.3.5 Filling of drain trenches
3.3.6 Components
3.3.6.1 Connections
3.3.6.2 Drain shafts, shaft
spillways and inspection
shafts
3.3.6.3 Drain outlets
3.3.6.4 Drainage wells
3.4 Pipe drainage without trenches
3.5 Open-ditch drainage
3.6 Subsoil amelioration
3.6.1 Deep loosening
3.6.2 Deep ploughing of mineral soil
3.6.3 Deep ploughing of bog and semi-bog