here are some pics of a 24" pipe with vent on it and a 48" riser. The bottom of this riser has 1 ft of concrete in it when done to hold it down then another 2 yards concrete on the base to hold it down. One pic shows anti seep collars being installed we dont dig a hole anymore we put them under the pipe and push them down then weld top half on. And yes these are extremely efficient when done right.
