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ANSWER As/A augerhole average backfill barrier clay loam CLAY SOILS considered cost deep percolation losses design drainage rate design rate design water table determine DISCUSSION disturbed samples drain depth drain envelope drain installation drain pipes DRAIN SPACING EQUATIONS drainable porosity DRAINAGE AND IN-SEEPAGE Drainage design factors drainage system economic envelope material estimated evapotranspiration expected drain field crops field drains flow groundwater heavy soils High-pressure jets irrigated areas irrigated simultaneously irrigation practices irrigation season land Land Reclam leaching requirement manholes mm/day natural drainage on-farm outlet percent permeable soils permeable surround piezometer pipe collectors PIPE DRAINS procedure recharge result salinity control shallow shallowest slope soil conditions soil hydraulic conductivity soil layers soil profile soil salinity soil structure soil texture soil variability subsurface drainage surface runoff transient design transient equations trench trenchless USBR water application water table depth water table fluctuates water table levels water table position