Drainage is the feature that separates a chaban from a tray, and it is the feature that separates a well-made chaban from a mediocre one. In our workshop we cut two families of drainage — channels and grooves — and every custom order eventually asks which is right for them.
This piece explains both, honestly, from the perspective of the people who cut them.
What is a channel?
A channel is a deliberate valley cut into the surface of the chaban, usually 5-8 mm deep and 8-15 mm wide, that guides water toward a discreet drain hole. Channels are directional. They have a beginning, a middle, and an end. Water enters them at the middle of the board, travels along the cut path, and disappears off the edge or into a hidden reservoir.
Our alder Flower of Life chaban uses channel drainage. The channels are integrated with the sacred geometry carving, so what looks decorative is actually functional.
What is a groove?
A groove is a shallower, wider, often multi-directional cut. Grooves do not aggressively transport water — they hold it, spread it thinly, and let evaporation and gravity do most of the work. A grooved chaban usually has a slight overall tilt so the surface stays visually clean, but there is no single "drain point."
Grooves are more common on old-style Chinese wooden trays and on modern Japanese-influenced boards. Our Chaban with River Stones uses a groove approach — the stones themselves act as micro-obstacles that spread water into the grooves around them.
Side by side
| Feature | Channels | Grooves |
|---|---|---|
| Depth | 5-8 mm | 2-4 mm |
| Function | Transport water to a drain | Spread and evaporate |
| Ceremony feel | Directional, dramatic | Quiet, dispersed |
| Best for | Heavy rinsing, Gong Fu Cha | Light practice, gaiwan work |
| Cleaning | Wipe channel with brush | Wipe surface with cloth |
| Carving integration | Excellent | Limited |
Which one for Gong Fu Cha
Gong Fu Cha produces a lot of water. Rinsing pots, warming cups, discarding first infusions — you generate a small stream every session. Channels handle this cleanly. If you practice Gong Fu Cha seriously, a channelled chaban like our Tree of Life alder table is almost always the right call.
Which one for gaiwan-only practice
If you practice with a single gaiwan and small cups, and your session is quieter — less rinsing, less warming — grooves work beautifully. They are less visually dramatic, but they suit a minimal practice.
How we cut them in the workshop
Roman cuts our channels by hand, starting with a router pass to establish the depth, then finishing with hand chisels for the curves and joinings. This is why our channels have soft edges — a fully machine-cut channel has hard, sharp inner walls that catch tea leaves and are difficult to clean. Ours are cut so a wet brush can sweep them clean in one pass.
Grooves are shallower and simpler. Roman typically cuts them in one pass, then sands the interior smooth. The finish is oil, always food-safe.
Reservoir vs open drain
Channels can end in one of two places: an open drain that exits the board (usually to a pitcher or bowl on the floor), or a hidden reservoir inside the board itself. We usually recommend open drains for teaching studios, where the water can flow into a large vessel, and reservoirs for home practice where a discreet finish matters more.
Reservoirs need to be emptied after each session. Do not skip this. Standing water in wood is the fastest way to shorten the life of a beautiful board.
Mistakes we have seen
Occasionally a customer sends us photos of a chaban they bought elsewhere, asking why it warped. The answer is almost always drainage. A poorly cut channel — too shallow, no slope, hard corners — pools water, and the wood swells then cracks. Or the finish was wrong. A cheap lacquer over the drainage area peels within months.
We finish every chaban with a food-safe oil that penetrates the wood rather than sitting on top. The channels are finished with extra care, since they see the most water.
Combining channels and grooves
Some custom orders combine both. A shallow decorative groove around the perimeter, feeding into a main channel that carries water off the board. Roman likes these builds because they are technically demanding — the two patterns have to align without either compromising the other.
If you like the sound of this, tell Alex when you write. It usually adds a week to lead time but makes for an exceptional board.
Custom drainage
Drainage is one of the most-customized features we build. Left-handed chabani need mirrored channels. Boards for very heavy pots need wider channels. Boards for small solo setups need finer, quieter grooves. All of it is possible. Write to metadeskukraine@gmail.com with a description of your practice and Alex will suggest a drainage pattern. Lead time 3-6 weeks.
Whichever direction you go, remember: drainage is not a feature. It is the soul of the chaban.