What is a dipwell? How restoration teams track peat water table depth

What a dipwell actually is

A dipwell is about as low-tech as monitoring kit gets: a length of perforated plastic or stainless tube, pushed down into the peat to a set depth, usually somewhere between 50cm and a metre, capped at the top. Water seeps through the perforations and settles at the same level as the surrounding water table. To take a reading, someone walks out, pops the cap, lowers a dipmeter (or a tape measure and a bit of judgement) down the tube, and notes how far below the ground surface the water sits.

That's the whole mechanism. No batteries, no telemetry, no software to license. Which is exactly why dipwells have been the backbone of peat water table monitoring for decades, on raised bog, blanket bog, and fen restoration sites alike.

Why restoration teams install a dipwell network

One dipwell tells you the water table at one point, on one day. A restoration programme cares about something bigger: whether a block of cutover bog, a drained grouse moor, or a forestry-to-bog conversion area is wetting up in line with the funded plan. So teams install a network, usually a grid or a set of transects crossing drains, bunds, and dams, with dipwells placed to catch the difference between the middle of a hagg, the edge of a drain, and the open bog surface.

Read monthly, or at minimum through the growing season and again after winter, the network builds up a picture of where the water table sits relative to the peat surface across the site. Funders care about this because it's the standard metric restoration gets judged against. Keep the average water table within about 10cm of the surface for most of the growing season and you're generally in the range associated with active peat accumulation rather than ongoing loss.

What a dipwell network can't tell you

The limits show up once a scheme has fifty or a hundred dipwells spread across a few hundred hectares. Each one is a point reading. Between points, condition can vary a lot, especially where old drains, haggs, and bare peat sit close together. A dipwell two metres from a gripped drain reads very differently from one on open bog twenty metres away, and a site with twenty dipwells can easily miss a drainage line re-cutting itself after last winter's storms.

Reading them is also a field job. Someone has to walk the transects in all weather, log the numbers, and get them into a spreadsheet before the next funding report is due. On a large restoration area that's real staff time, and gaps in the record are common: a missed round, a dipwell silted up, one trampled by deer or lost under a fresh haul of brash.

Automated loggers help with some of this. They record water table continuously at a subset of dipwells rather than relying on a monthly visit, which solves the frequency problem. They don't solve the coverage problem. A logger still only tells you about the point it's sitting in.

Where a wider view fits in

This is the gap a landscape-scale read on peat condition is built for. Spectral indices and year-over-year change flag drainage, burn scars, and bare peat exposure across the whole restoration area, wherever they occur. It doesn't replace the water table numbers a funder wants to see. It tells you where to walk the next transect, and which drains and bare patches have shifted since the last check. Peatland Monitoring is building toward exactly that: an annual condition layer and a change flag list for a restoration area, so the dipwell network and the field team's time go where the peat is moving.

If the dipwell readings are the detail and the missing piece is the overview that tells you where to point them next, Peatland Monitoring's early access list is open for restoration areas like yours.