Drainage Plow Basics

A drainage plow cuts a narrow slot in the ground and feeds drain pipe into it in one pass. It is an efficient way to dry wet ground, and also an easy way to make a costly mistake.

Key points

A drainage plow slices a slot and lays pipe in one pass.
It needs a properly matched, well-ballasted tractor.
Grade control makes or breaks the system.
Locate utilities and plan the outlet before you start.
Hire a contractor for large or tricky jobs.

What does a drainage plow do?

A drainage plow, often called a tile plow, has a blade or shank that slices into the soil and a boot that guides flexible drain pipe into the slot behind it. The slot closes up behind the machine, leaving buried pipe that collects extra water and carries it to an outlet.

The method is fast and disturbs less soil than digging an open trench, which is why it is common for field drainage on suitable soils.

What tractor and hookup does it need?

Drainage plows pull hard. They need a tractor with plenty of pulling power, good traction and the weight to stay stable in tough soil. Check the plow manufacturer's recommendations and your tractor's operator's manual for hitch type and capacity. Do not guess.

Many plows pull from the drawbar or use a heavy hitch arrangement, and some use laser or GPS guidance to hold grade. A mismatch between tractor and plow can mean broken equipment, lost traction or loss of steering control.

Confirm hitch and drawbar capacity in the manual
Use proper ballast and tire setup
Check shank, boot and pipe feed condition before starting

Why does grade control matter so much?

Drain pipe must slope toward the outlet at a steady, designed grade. Too flat and water sits and sediment settles. Too steep and flow can scour the pipe or the outlet. A plow that wanders up and down leaves low spots that silt in over time.

Grade control is usually managed with a laser or GPS system, or an experienced operator with a transit. Your local NRCS office and your extension service can explain drainage design and spacing for your soil.

What should you check before plowing?

Know your soil. Rocky, stony or very hard soils can wreck plows and pipe. Check for existing tile lines, utilities and buried obstacles, and call 811 before digging. Mark your outlet and confirm it is allowed and stable.

Check legal and neighbor issues too. Drainage can affect wetlands or neighboring land, and rules on outlets and wetlands vary. Talk to NRCS, your county conservation district and, if needed, an attorney before changing how water leaves your property.

On a ranch hay meadow with a seep or spring, mark the wet area in a dry season as well as a wet one if you can. Patches that look small in summer may be much larger in spring, and the plow line should follow the real water pattern. Aerial maps, soil survey information and a few probe holes can fill in the picture.

How do you protect the pipe during installation?

Pipe should be handled per the manufacturer's instructions, kept clean and fed smoothly without kinking. Check that the pipe is seated on the bottom of the slot and covered properly. Join pieces and fit outlet screens as the manufacturer directs.

Install animal guards or screens at outlets to keep rodents and debris out. Mark the location of the tile with GPS or a map so future work does not cut it.

What are common mistakes with drainage plows?

The common ones are plowing when the ground is too wet or too dry, ignoring grade, skipping outlet planning and failing to record line locations. Another is trying to plow in soil the machine was never built for.

Don't run machinery with missing shields or work around hydraulic parts with bare hands. Hydraulic leaks can inject fluid under the skin, so use cardboard or a proper tool to look for leaks, and call a qualified mechanic for hydraulic repairs.

When should you hire a drainage contractor?

For a few hundred feet on a small, easy field, an experienced owner may handle it. For large fields, difficult soils, strict grade needs or complex outlets, a contractor with the right plow and guidance equipment is usually the better choice.

Ask for references, ask what grade control they use and get the scope in writing. For permits, cost sharing and financing, check with NRCS, FSA and a lender, since terms vary.

Bring the manual, a spare set of hydraulic hose fittings the dealer approves and a clear plan for what you will do if the plow hangs up. Stopping early to sort a problem beats forcing a stuck machine, which is how shanks bend and frames crack. If anything structural looks damaged, shut down and call the dealer service department.

When to get help: Call your NRCS office or a drainage contractor for design, the dealer service department for hydraulic or hitch problems, and an attorney about wetlands or neighbor drainage issues.

Sources and further reading

Organization homepages are linked so you can search them for current guidance on this topic.

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