How Do You Unclog An Underground Outdoor Drainage Pipe. You should be able to. Once the pipe is clear and you have access to both ends, using the shop vac once again, put a fish line tied to a small rag and draw it through the pipe with the suction.
Pull the underground drain, which is often a black, corrugated, plastic pipe, away from the end of the downspout. You may be able to dig up a small area, and examine that section, to establish whether the clog is higher or lower. You do not try to carry water away from your house with perforated pipe.
Snake or hose out outdoor drains;
Place the end of a plumber's auger, also known as a snake, into the underground gutter. Once the pipe is clear and you have access to both ends, using the shop vac once again, put a fish line tied to a small rag and draw it through the pipe with the suction. Place the end of a plumber's auger, also known as a snake, into the underground gutter. Water rooter shoots powerful jets of water in multiple directions.