Couple decades ago I worked ...

Couple decades ago I worked with (Gene) Field Drainage (internet info: (863) 781-1276; 515 Airport Rd, Wauchula, Florida 33873 ).  We installed ABS/plastic drain tile 4"-12" with or without sock cover using 3-D gps primarily in orange groves, however we also installed a shallower version of same configuration whereby at the system drainage outfall a series of weir plates could be inserted to essentially raise/define the ground water elevation.  So instead of simply, efficiently draining an area we could alternatively flood a field (i.e. sod farm irrigation).   Being 20 years ago not sure of advances he's made, but was pretty easy back then...