Bulletin E3467
Choosing Between Sock-Wrapped and Sand-Slot Pipes

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August 1, 2023 - Author: <ghane@msu.edu>,

If fine sand or silt gets into subsurface (tile) drain pipes, it can remain near the entry point, build up over time, and cause drain clogging. If drain sedimentation is a problem, use either sock- wrapped or sand-slot pipe (Figure 1). A sand- slot pipe is also known as narrow-slot, knife-cut, or fine-slot. A sand-slot pipe has a narrow slot width of about 0.015 inches to keep sediment out of the drain pipe. Typically, a regular-perforated rectangular-slotted pipe is wrapped with a knitted- sock envelope. Other pipes can also be wrapped with a knitted sock to give the same drainage performance. For more information about regular-perforated pipes, see Ghane (2022b).

This bulletin describes the condition where sock- wrapped and sand-slot pipes are needed. The bulletin also compares the properties of three 4-inch diameter pipes: sock-wrapped, 8-row sand- slot, and 4-row sand-slot pipes. The evaluated properties include water entry into the pipe, water-table drawdown, drain spacing, and cost effectiveness. This bulletin is based on scientific research conducted on CARRIFF Type A circular-knitted-sock geotextile envelope and commonly manufactured sand-slot pipes in the Midwest USA (Ghane, 2022a; Ghane et al., 2022).

To read more about this, go to the MSU Extension Drainage Website.

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