Working with Water

A field manual for restoring the water cycle on your land

Most land loses its rain. The drops hit bare ground, sheet across the surface, cut into a channel, and run off into a ditch or a stream and away. On a lot of properties the water that fell in the morning is gone by afternoon. We built it that way on purpose. Pipes, tile drains, straightened creeks, graded roads. A whole age of moving water off the land as fast as possible.

Brock Dolman at the Occidental Arts and Ecology Center calls that the drainage paradigm. The Drain Age. And he gave us the phrase that turns it around: slow it, sink it, spread it.

That phrase is the start of this manual. I've stretched it out over the years, talking with Brock and with Nik Bertulis, into something longer that follows the water further:

Slow it, sink it, spread it, sprout it, sap it, sweat it, sky it, suction it.

Say it out loud. It's a set of actions, and each one hands the water to a different part of a much bigger system. This manual walks that system from the ground up, one level at a time. At each level I'll show you what the water is doing and the structures and techniques that help it do more.

Water doesn't move in one loop. It moves in four, nested inside each other:

The surface loop, where rain runs off into rivers and out to sea.
The groundwater loop, where water sinks into the soil and recharges the aquifer.
The small water cycle, where plants breathe water back into the sky and it falls again nearby.
The large water cycle, where moisture rides inland from the ocean, forest to forest, across a continent.

Heal a piece of land and you reconnect it to all four. The point of the work is to keep water in living systems longer, to give it more ways through, so the land can carry itself from the wet season into the dry one and hold together through drought, flood, and fire.

One rule runs underneath everything here, and I'll come back to it: sink it before you lift it. Build the soil's ability to hold water before you plant a thousand thirsty trees. A landscape that pulls water up through vegetation without a full sponge underneath will dry itself out. Lift it is less than sink it. Keep that in your pocket.

Let's start where the rain lands.

Level 1: The surface. Slow it, spread it.

Before water can do anything useful on your land, it has to stop leaving so fast.

Walk your property in a hard rain. Actually do it, boots and a raincoat, in the middle of a downpour. You'll learn more in twenty minutes than in a season of reading. Watch where the water sheets, where it pools, where it cuts a little channel, where it's already carved a gully. That's your map. Water tells you what it wants to do. The whole job at this level is to catch it up there, high in the landscape, and slow it down before it gathers speed.

Fast water is the enemy. Slow water sinks and feeds the land. The same rain that erodes a hillside when it's moving will soak in and grow a forest when it's stopped. So you slow it, and you spread it out sideways so it isn't all racing down one path.

Here are the structures that do it, roughly from the simplest to the most involved.

Ground cover and mulch

The first water structure isn't a structure at all. It's a cover on the soil. Bare ground sheds water and bakes hard. A layer of mulch, leaf litter, or living plants breaks the fall of the raindrop, keeps the surface open, and slows the sheet flow to a crawl.

Start here on any site. Chop-and-drop the weeds, spread wood chips, let the leaves lie. Cover the ground and you've already slowed the water before you've dug anything.

Swales

A swale is a shallow ditch dug dead level along the contour of a slope, with the soil piled on the downhill side as a low bank. Because it's level, water can't run along it. It just sits, spreads the whole length of the trench, and soaks straight down.

Swales are the workhorse of slowing and spreading. On a gentle to moderate slope they turn a hillside that sheds water into a hillside that drinks it. You dig them on contour, which means you need to find the true level line across your slope. A cheap A-frame level made of three sticks and a string will do it, the same tool farmers have used for centuries.

Plant the downhill bank with trees and deep-rooted cover. The swale waters them, and their roots hold the bank and keep the trench alive.

A caution. Swales belong on land that's stable and not too steep. On a steep slope, or on heavy clay that stays soggy, a swale full of water can saturate the ground and slump. When in doubt, go smaller, watch it through a wet season, then decide.

Berms, bunds, and half-moons

Sometimes you don't dig down, you build up. A berm or a bund is a low raised bank that catches water and holds it in place.

The half-moon, or demi-lune, is a bund shaped like a crescent with the open end facing uphill. Rain runs in, hits the curved wall, and pools where you've planted. These come from the drylands of the Sahel, in Niger and Burkina Faso, where farmers use them to bring dead, crusted land back into production. On a small scale you can dig a half-moon by hand in an afternoon. They shine on flat or gently sloping ground that's too dry and hard to grow anything.

Zai pits

A zai pit is a planting hole, roughly a hand's depth and width, dug into hard ground and filled with compost or manure. The pit catches and holds the rain. The compost feeds the plant and draws in termites, whose tunnels crack the soil open so water can sink deeper.

Zai come from Burkina Faso, revived and spread by a farmer named Yacouba Sawadogo, who used them to regreen land everyone had written off. He earned the name "the man who stopped the desert." I mention his name because the technique is his people's, not a generic trick. It works because it does three things in one small hole: catches water, feeds soil, and invites the life that keeps the soil open.

Check dams, leaky weirs, and gabions

Once water has already gathered into a channel or a gully, you're playing catch-up, but you can still slow it. You do it with small barriers built across the flow.

A leaky weir is a low, permeable dam, often built of rock, brush, or logs, set across a drainage line. It's meant to leak. Water backs up behind it, drops the silt it was carrying, spreads out, and soaks in, while the excess trickles through instead of blasting over the top. A gabion is the same idea built from rock packed into wire cages, strong enough to hold in a channel that runs hard.

The principle is always the same. Don't try to stop the water with one big wall. Slow it with a series of small leaky steps down the channel, so each one catches a little, drops its sediment, and hands the rest gently to the next.

Beaver dam analogs

The best water engineer in the northern world has four legs and builds for free. A beaver dam backs up water into a wide, slow wetland, raises the water table for a long way upstream, and stores the wet season deep into summer. Where beavers are gone, people now build beaver dam analogs, lines of wooden posts woven with branches across a stream, to mimic that work and, often, to invite the beavers back to take over.

If you have a degraded stream cutting down through your land, a series of these can lift the water table, spread the flow across the old floodplain, and start the wetland rebuilding itself. Check your local rules first. Working in a live waterway is regulated in most places, for good reason.

Reading it as a system

Notice what all of these share. None of them is a plug. Every one is a way of slowing water and spreading it wide so it has time and room to sink. You almost never want a single structure. You want a lot of small ones, high in the landscape and stepped down through it, each doing a little. A property full of small slow-water structures behaves like a sponge instead of a slide.

Slowing and spreading is the whole task at the surface. But slowing is only the setup. The reason you slow the water is so it can do the next thing, which is sink.

Level 2: The groundwater cycle. Sink it.

Water that soaks into the ground disappears from view and becomes the most valuable thing on your land.

Below your boots the soil holds water in every pore and crack, and below that it fills the spaces in rock and gravel, the aquifer, the underground reservoir that feeds springs, wells, and the base flow of streams through the dry months. When people say a landscape is "drying out," most of the time they mean this store has been drained and isn't being refilled. Rain still falls. It just runs off before it can sink.

Sinking water is how you shift it in time. Surface water is here today and gone tomorrow. Water in the ground can sit for weeks, months, sometimes years, and come out slowly when the land needs it most. You're moving water out of the fast loop and into the slow one, banking the wet season to spend in the drought.

I live and work on karst limestone in the Yucatan, 39 hectares of it. Karst is rock so porous that surface rivers barely exist here. The rain that falls sinks almost straight down through the stone into the aquifer and the cenotes. That's an extreme case of a landscape built to sink water. Most land isn't karst, but the lesson holds everywhere: the more your ground behaves like a sponge, the more of your rain you keep.

Two things make ground sink water: structures that hold it on the surface long enough, and soil alive enough to drink it.

The soil sponge

The single biggest reservoir you can build isn't a pond. It's the soil itself.

Healthy soil is mostly space, and that space fills with water. What holds it open is organic matter and the life woven through it: roots, fungal threads, worm burrows, the whole underground web. Soil rich in organic matter can hold several times its weight in water and release it slowly. Poor, compacted, lifeless dirt sheds rain like a parking lot.

So the deepest "water structure" you'll ever build is living soil. You build it by keeping the ground covered, feeding it organic matter, and disturbing it as little as you can:

Stop tilling where you can. Tillage burns through organic matter and collapses the pores that hold water.
Keep something growing, or at least mulched, on the soil at all times. Bare soil loses water and structure fast.
Add compost and, where it fits, biochar. Charcoal made for the soil is riddled with tiny pores that hold water and house microbes, and it lasts in the ground for a very long time.
Feed the fungi. The threads of mycorrhizal fungi bind soil into crumbs and open the channels that let water sink deep.

Build the sponge first. Everything else at this level works better once the ground can actually drink.

Infiltration basins and recharge ponds

An infiltration basin is a shallow dug depression with a flat, level bottom, made to catch runoff and let it soak in rather than to hold water like a pond. Rain and overflow collect in it, sit, and sink. Site one where water already wants to gather, at the bottom of a swale run or where a slope flattens out.

A recharge pond does the same on a bigger scale, holding a body of water that seeps down and refills the aquifer beneath and around it. In dry country these are often dug where a seasonal flow can be diverted in, so the flood that would have run away instead sits and sinks.

Rain gardens

A rain garden is a small, planted infiltration basin, usually near a house, a roof, or a driveway, dug to catch the runoff from those hard surfaces. You direct the downspout or the driveway sheet into a shallow planted hollow, and it soaks in over a day or two instead of running to the storm drain. It's the easiest place for most people to start, and it turns the roof of a building into a recharge point instead of a firehose.

Johads and traditional recharge tanks

Across arid India, communities have caught and sunk their monsoon for centuries with johads, simple earthen dams built across a slope to hold the rains in a crescent of water that soaks down and refills the wells below. In the Alwar district of Rajasthan, work led by Rajendra Singh and local villages rebuilt thousands of these, and rivers that had gone dry for years began to flow again. Similar tank-and-bund systems, under many different names, show up in dry regions all over the world.

I name the johad and the people who revived it because it's theirs, and because it makes a point worth holding onto. The tools for sinking water are old. Most cultures that lived in dry places worked them out long ago. A lot of restoration is remembering.

The sequence rule, again

Here's where sink it before you lift it earns its keep.

It's tempting to plant heavily right away, to green the place up fast. But young forest and dense vegetation pull a lot of water up and breathe it into the air. Do that before the soil sponge and the groundwater are rebuilt, and the plants drink down a store that isn't being refilled. The land gets drier, not wetter, and in a dry year the whole planting can fail.

So the order matters. Slow the water, sink it, build the soil, refill the ground. Then, as the sponge fills, bring on the vegetation that lifts water back into the living cycle. Sink leads. Lift follows. When they're balanced, the next level opens up.

Level 3: The small water cycle. Sprout it, sap it, sweat it, sky it.

Now the water goes up.

Everything so far has moved water down and sideways, slowing it, sinking it, banking it in the ground. This level sends it back into the sky, through living plants, in a way that brings it down again close by. This is the small water cycle: the local loop of water rising off the land as vapor and falling again as rain, dew, and mist, over and over, without ever going back to the sea.

A leaf is a water structure. A forest is a water structure. Once you understand that, planting becomes part of the hydrology, not decoration on top of it.

Here's the loop, in the order the water travels.

Sprout it

Water in the ground grows plants, and plants run the rest of this cycle. So the first move at this level is to get things growing: cover crops, pioneers, the fast scruffy species that colonize bare ground and start building shade and root and litter.

You rarely have to plant much. On most land, once the water is slowed and sunk and the soil starts to wake up, seeds already in the ground and blowing in from the edges do the sprouting for you. The land wants to grow. Your job is mostly to take the pressure off and let succession run: pioneers first, then the shrubs and trees that follow them, each stage building the soil and shade for the next.

Sap it

A growing plant pulls water up out of the soil through its roots and moves it up the stem to the leaves. Sap it. This is the pump that lifts groundwater back toward the sky.

Trees do something even better underground. Their roots move water between wet and dry layers of soil, a process called hydraulic redistribution. In wet times a tree can carry water down its roots into deeper soil and store it. In dry times it draws water up from far below and, through its roots, shares moisture into the upper soil where shallower plants and soil life can reach it. A big tree is a living pump working the vertical column of soil in both directions. This is one more reason old trees matter more than their timber. They're managing water for everything around them.

Sweat it

Water reaches the leaves and evaporates out through tiny pores into the air. That's transpiration. A plant sweats, the same way you do, and for the same reason: it cools itself.

The cooling is a large effect. Evaporating water carries a lot of heat away, so a green, transpiring landscape runs cooler than bare ground next to it, sometimes by a lot on a hot afternoon. I've walked out of dry, hot scrub into old forest and felt it drop cool and damp around me like walking into a different climate, because that's what it is. The forest is running its own air conditioning, powered by water and sun. Cooler air, more humidity, gentler conditions for everything living there. The plants build the climate that suits them.

Sky it

The vapor rises off the whole living surface, from the leaves and from the moist soil and litter beneath, and enters the sky. Evapotranspiration, all of it together. Sky it.

And here's the part that changes how you think about a landscape. That vapor doesn't just leave. Over land with a lot of vegetation, much of the water that rises comes back down not far away, as the next rain, or as dew and fog settling out overnight. The land recycles its own rainfall. A well-vegetated region can rain, rise, and rain again many times as the moisture works its way inland, each patch of forest handing water to the next.

Which means bare land and green land don't just differ in what grows on them. They differ in how much it rains. Strip the vegetation and you break the local loop; the water that does fall runs off and leaves, and less comes back. Rebuild the vegetation and you start the loop turning again. This is why large-scale clearing can dry out a whole region, and why restoration, done widely enough, can help rehydrate one.

The dew cycle

There's a quieter loop running alongside the rain: dew and fog. On a clear night a vegetated surface cools and pulls moisture out of the air onto every leaf and blade. In some dry and coastal places this hidden water adds up to as much as the rain, and certain plants and whole forests drink a real part of their water straight from fog and dew. A living, layered, humid landscape catches far more of this than bare ground does. It's a humidity system the land builds for itself once the vegetation is there to run it.

The living structures of this level

The techniques here are all ways of getting living cover established and layered, so the land can sap, sweat, and sky as much water as possible:

Let succession run. The cheapest and often best move. Take the pressure off, keep the water on the land, and let the pioneers and volunteers do the planting. Assist where the seed source is gone or the site is too far degraded to start on its own.
Plant in layers. A multi-layered planting, ground covers under shrubs under a canopy, moves far more water and holds far more humidity than a single layer. A young food forest or a mixed native planting is a water structure with roots.
Windbreaks and shelterbelts. Rows of trees across the wind slow it down, and slower wind means less drying. A shelterbelt keeps humidity in the field it shelters and cuts the moisture the wind would strip away.
Restore wetlands and streamsides. The wet, green ribbon along a watercourse is where the small water cycle runs hardest. Riparian trees and marsh plants transpire heavily, hold the banks, and keep the whole corridor cool and humid.
Keep open water in the mix. Ponds and slow wetlands feed the dew and humidity cycle and give wildlife, insects, and amphibians the water that keeps the rest of the system working.

Do this across enough of a landscape and the land starts making a meaningful part of its own weather. Which points at the largest loop of all.

Level 4: The large water cycle. Suction it.

Stand at the coast and walk inland, and ask a simple question: where does the rain a thousand kilometers from the sea come from?

If the ocean were the only source, rainfall would drop off fast as you moved inland. The air would rain itself out in the first few hundred kilometers and the deep interior of every continent would be desert. Some interiors are. But the great forests aren't. The Amazon is wet all the way across. So is the Congo. Something carries ocean moisture deep inland and keeps the rain going, forest after forest.

Part of the answer is the small water cycle from Level 3, scaled up: each patch of forest rains, breathes the water back up, and passes it on to the next patch inland, a relay running for thousands of kilometers. The forest doesn't just receive the rain. It moves it.

There may be more to it. Two Russian scientists, Victor Gorshkov and Anastassia Makarieva, proposed what they call the biotic pump. Their idea: when the huge volume of water vapor over a forest condenses into cloud and rain, it takes up less space, and that drop in volume lowers the air pressure. Low pressure pulls air in from where the pressure is higher, from over the ocean. So a big forest, by raining, would suck moist ocean air toward itself, powering its own supply. The UCLA meteorologist Rong Fu has described a related mechanism, where the heat released as vapor condenses drives that inflow of ocean air. The biotic pump is still argued over in the science. I lay it out because it's a serious idea about how living forests might pull their own rain across a continent, and because either way the core point holds: intact forest is doing something big to the movement of water at the scale of a whole region.

Suction it, in the mantra, points at this. The largest thing living land does with water is help draw the ocean inland.

What one property does at this scale

You can't build the large water cycle on your own land. But you're a link in it.

Every restored piece of ground is a relay station in that chain, catching moisture, breathing it on, keeping the corridor a little wetter for the next piece inland. On its own it's small. Joined up, watershed by watershed, neighbor by neighbor, it's how a region rehydrates. So the large-scale work is really the small-scale work done widely and stitched together:

Think in watersheds, not property lines. Water doesn't stop at your fence. The more of a catchment that's slowing, sinking, and greening water, the better every piece in it does. Talk to your neighbors. Restoration spreads best sideways.
Protect what's already intact. A patch of old forest or healthy wetland is already running all four cycles at full strength. Keeping it is worth more than replacing it, and it seeds the recovery of everything around it.
Connect the fragments. Corridors of vegetation between patches let the living water cycle run unbroken across a landscape instead of in stranded islands.

Which brings the whole thing back around to why it works.

Putting it together: the land that runs its own water

Look at what you've done climbing these four levels. You slowed the water and spread it. You sank it and built the soil to hold it. You grew the vegetation that lifts it back into the sky as local rain and dew. And you linked your ground into the larger flow of moisture across the region.

You've given water more ways through the land. That's the real work. Not one channel but many. Not one store but several: the soil, the aquifer, the living vegetation, the air itself. And a landscape with many pathways for water is a landscape that can take a hit and keep going.

Think about the two problems that break most land: too much water in the wet season, not enough in the dry. Flood, then drought. A drained, bare landscape suffers both hard, because the wet-season water leaves before the dry season comes. A landscape that slows and sinks and grows moves that water across time. The flood soaks in instead of tearing through. The stored water comes back out slowly and carries the land through the dry months. The system shifts water from the season of too much to the season of too little, on its own.

More hydrated ground is also land that doesn't burn as easily. Water in the soil and the living plants is a buffer against fire, one more thing that more loops buy you.

And here's the part I find most hopeful. Once you get it started, the land takes over the building.

Water grows vegetation. Vegetation shades and cools the ground and drops litter. The litter and roots feed the soil life. Richer soil holds more water. More water grows more vegetation. Round and round, each turn making the next one stronger. The biologist Stuart Kauffman has a name for a system that builds itself this way, an autocatalytic set: the outputs of the process become the ingredients that keep it running and grow it. Plants, soil, fungi, and water together are exactly that kind of set. Given a start and left alone, they catalyze themselves into something richer and more alive than what you began with.

That's the whole bet of this work. You don't build the ecosystem. You get the water cycling again, take the pressure off, and the land builds the ecosystem, faster than you'd think and better than you could have designed. I've watched 39 hectares of overgrazed limestone go from bare rock and thornscrub to closed-canopy forest holding more than 500 documented species. The land did that. We slowed the water, sank it, kept the ground covered, and got out of the way.

Where to start on your own land

Don't try to do all four levels at once. Start at the top and let it work down.

Walk your land in the rain. Find out where the water goes now. That's your plan, drawn by the water itself.
Cover the soil. Mulch, chop-and-drop, stop the bare ground from shedding rain. Simplest move, works anywhere, start today.
Slow the water high up. One swale on contour, a few leaky check dams in the gully, a rain garden off the roof. Small and high beats big and low.
Build the soil sponge. Compost, no-till, keep it covered, feed the fungi. This is the reservoir that makes everything else work.
Let it green up, in step with the water. Take the pressure off and let succession run. Plant in layers where you need to help it. Sink before you lift.
Zoom out. Think in watersheds. Talk to your neighbors. Protect what's already whole.

Start small. Watch what the water does through a full wet season and a full dry one before you go bigger. The land will show you what it needs, and it will meet you faster than you expect.

Slow it, sink it, spread it, sprout it, sap it, sweat it, sky it, suction it. Eight words for one thing: give the water back its living home, and let the land do the rest.