Practical Farm Drainage: Why, when and how to Tile Drain

acre action of drains angle Blickensderfer Tile Drain branch drains cents CHAPTER clay column construction cost of draining Cost of Tile crops cultivation curves deep drainage Depth of Ditch depth of drained discharge distance Ditching Machine Drained Roads drained soil drains laid dry soil earth Eleva embankment evaporation expense farm farmer feet and inches feet deep feet long field figure flat flow four feet four inches give given grade line elevation grade peg guide stake hundred feet instrument Intercepting Water junction land line of tile loam main drain ment moisture natural drainage open ditches plants ponds portion prairie farms prairie soil profit purpose rain rainfall remove road bed roots saturated shown in fig side silt basin slope sloughs spade spirit level sub-mains sub-soil sufficient surface surplus water three feet tile laid tillage tion tubes under-draining undrained velocity water-table rises