Drainage hole

Drainage hole

A hole in a retaining wall; an open joint in masonry, to drain unwanted water.

drainage hole

An opening in a construction which permits unwanted water to drain away, e.g., from behind a retaining wall.
References in periodicals archive ?
2 ADD A FEW CROCKS Even if the pot has a large drainage hole, drainage will be poor if it becomes blocked.
Find a large pot and put some crocks or washed gravel over the drainage hole to prevent the compost blocking it, then half fill the pot with polystyrene pieces.
Cut two 2-inch-square pieces of plastic mesh and lay one over each drainage hole on the inside of the bonsai dish.
Put a few broken crocks or chippings heaped loosely over the drainage hole in the base, this will prevent it becoming obstructed.
Dropping the stem through the drainage hole of an inverted flower pot provides darkness and still air to encourage rooting yet allow the steam base to form a callus.
Use broken flowerpots or china to ensure the drainage hole remains clear and then add a 1in (2.5cm) layer of horticultural grit, again to ensure good drainage.
Place a layer of crocks over the drainage hole, followed by four to five inches of good quality sieved garden soil, into which you have added some extra compost.
In Section 4, the degrees of coal seam damages caused by LCDPTE and the gas drainage effects at different spacings between the gas drainage hole and the blast hole are numerically investigated in detail.
The diameter of the gas drainage hole is 100.0 mm, the coal seam is about 6.0 m thick, the length of gas drainage hole and coal thickness are all much larger than the diameter of the gas drainage hole, and so the gas drainage process can be simplified as a 2-dimensional plane strain problem.
STEP 4: Slip a 12-inch length of PVC pipe partway through the pot's drainage hole and grid to connect it to the pump; seal space between pipe and drain hole with epoxy putty.
Step 2: Carefully make a drainage hole in bottom of eggshell.