Learn · Water · 13 min read · Updated September 2026

The water dragon

On the plains there were no hills, and the tradition read the rivers instead. The Water Dragon Classic and the delta it was written for; the six forms of water read from a door, the jade belt and the reverse bow, the water that shoots, the water that leaves, the meeting and the pool; the water mouth that closes a site; what the river engineer says about the inside and the outside of a bend, which is the classic’s rule with the mechanism attached; and how the forms scale down to a road, a drive and a bowl.

Oriented N 000°

Water

Fig. 01 A river in a bend, with fields in its belly. The tradition called the curve a jade belt, and built inside it.

The Form school was made in the hills of the south, and its first texts read a site by the ridges behind it and beside it. When the practice reached the plains of the lower Yangtze, where the land is flat for a hundred miles and the only lines in it are water, the masters wrote a new book, and its subject was the river. This essay gives the Water Dragon Classic and the delta it was written for, the six forms of water it reads from a door, and the reason a river engineer gives for the two forms it cared about most, which is the classic’s rule with the mechanism attached.

A classic for the plains

The Shuilong Jing, the Water Dragon Classic, is a treatise on reading watercourses round a site, associated with the seventeenth-century master Jiang Dahong and assembled, as the texts page says, from older material; Paton translates it among his five classics and reads it against the landscape it describes. Its premise is stated in its first pages: in the mountains the dragon is the ridge, and on the plains, where there is no ridge, the dragon is the water, and every rule the Form school gives for hills is to be applied to rivers, canals and creeks. The delta of the Yangtze, drained and cut by a thousand years of canals, was the country the classic was written for, and its households sited their houses, their graves and their villages by the turns of the water because there was nothing else to site them by. Bruun’s history places the classic in the late imperial flowering of the manuals, and Feuchtwang’s analysis of a practitioner’s reading finds the water rules used exactly as the hill rules are, as a set of forms to be looked for and faults to be named; de Groot, watching the geomancers of Fujian, found them reading a creek with the same words as a range. The book is the tradition’s admission that its method was about shape, not about hills, and the rivers are the proof.

Six forms, read from the door

Fig. 01 Six forms of water as the Water Dragon Classic reads them, the house drawn solid and the water in blue, each read from the door. A: the jade belt, a river that bends round the site with its belly toward the house, which the classic reads as water embracing and holding, and which every manual since has wanted in front of a door. B: the reverse bow, the same bend with its back to the house, the outer edge of the curve drawn across the front like a blade, which the manuals list among the sha. C: shooting water, a straight reach aimed at the door, read as qi arriving too fast to be held, the water’s form of the road that runs at a house. D: leaving water, a straight reach running away from the site in full view, read as wealth seen going; the classic wants water to leave out of sight, behind a turn or a hill. E: the meeting, two streams joining before the site with the house in the fork, which the classic prizes, since two waters hold better than one. F: the pool, still water before the door, the bright hall filled, which the manuals allow when it is clean, in scale and not too near. The reading is the Form school’s, and it is also, as the section beside it shows, a river engineer’s. The forms are the ones Paton’s translation of the classic gives and the yang-house manuals repeat; the classic was written for the plains of the Yangtze delta, where there were no hills and the water did all the work of the landform. The site’s water features guide takes the same forms indoors at the scale of a bowl.

The classic sorts water by its shape as seen from the site, and the six forms drawn above are the ones the manuals repeat. The jade belt, a bend with its belly toward the house, is the form every text wants before a door: water that embraces, holds and slows, drawn as the belt a Ming official wore. The reverse bow, the same bend with its back to the house, is listed among the sha the catalogue draws, the outer edge of the curve read as a blade across the front. Shooting water, a straight reach aimed at the door, is the water’s form of the road that runs at a house, qi arriving too fast to be held; leaving water, a straight reach running away in full view, is wealth seen going, and the classic wants water to leave behind a turn or a hill, which is the water mouth again. The meeting of two streams with the site in the fork is prized, since two waters hold better than one, and the still pool before the door is allowed, when it is clean, in scale and not too near, as the bright hall filled. The water features guide takes the six indoors, where the river is a bowl and the rules are the same.

The inside and the outside of a bend

Fig. 02 A bend of a river, in plan above and in section below, read by the river engineer and the geomancer at once. In a bend the current runs fastest along the outside of the curve, where it cuts the bank steep and carries it away, and slackest along the inside, where it drops what it carries and builds a gentle bar of sand and silt that grows year by year. The house on the inner bank, in the belly of the bend, stands on ground that is being added to, with the water embracing it and the flood arriving slowly: the tradition’s jade belt. The house on the outer bank stands on ground that is being taken away, with the water’s back to it and the current’s force aimed at its foundations: the tradition’s reverse bow. Leopold, Wolman and Miller’s text on rivers gives the mechanism, and the Water Dragon Classic, three centuries earlier, gave the rule without it. The section is exaggerated in height; a real bar rises by centimetres a year and a real cut bank falls by metres in a flood. The rule holds for any bend, from a river to a lane, and the site’s sha catalogue applies it to roads.

The two forms the classic cared about most, the belt and the bow, are the two banks of a meander, and the river engineer gives them the reason the classic did not have. In a bend the current runs fastest along the outside of the curve, where it cuts the bank steep and carries it away, and slackest along the inside, where it drops what it carries and builds a bar of sand and silt that grows year by year; Leopold, Wolman and Miller’s text on rivers gives the mechanism and the measurements. A house on the inner bank, in the belly of the bend, stands on ground that is being added to, with the water embracing it and the flood arriving slowly across the bar; a house on the outer bank stands on ground that is being taken away, with the current’s force aimed at its foundations and the flood arriving first. The classic’s households, who buried their dead and built their villages on the inside of bends for three centuries before the geomorphology was written, were reading the river correctly with the wrong theory, and the theory has since been replaced without the reading needing to change. The four animals essay makes the same point about the hills; the water dragon makes it about rivers, where the mechanism is easier to see.

Design observation · The forms at the scale of a road

The tradition applied the water forms to roads as soon as there were roads to apply them to, on the principle that a road carries movement as a river carries water, and the sha catalogue draws the results: the road that bends round a house is a belt, the one that bends away a bow, the one aimed at the door a shooting reach, the drive that runs straight off a leaving water. A designer reads the same forms as sightlines, traffic and noise: the house in the belly of a curve sees the road from the side and hears it least, the house on the outside is where the headlights sweep and the lorry that misses the bend arrives. The rule that a house should sit inside a bend and not outside one is a road-safety rule before it is anything else, and the classic wrote it for water.

The flood line

Fig. 03 Where the classic and the flood engineer part, in one section across a bend. The river runs in its channel at the left, cutting into the outer bank, which is the bow the classic refuses; on the inside of the bend it drops what it carries and builds the point bar, the low, level, fertile ground in the belly of the belt that the classic and the farmer both want. Beyond the bar lies the floodplain, which the river covers in a wet year and buries in silt, and beyond the floodplain the terrace, an older floodplain the river cut down from and no longer reaches, and then the hill. The classic’s house in the belly of the bend stands on the bar or the floodplain, the best land and the lowest; Leopold’s river puts the flood line over it once in a decade or a century, and the engineer’s house stands on the terrace, inside the bend still, with the water in front and the hill behind, above the line. The classic was written by people who had watched rivers for a thousand years and it does not mention the flood line, because its readers knew where it was; a reader who does not should ask the flood map before the compass. The section is schematic; the terms are Leopold, Wolman and Miller’s. Flood maps are public in most countries and give the hundred-year line, which is the line the terrace is above and the bar is below.

The classic and the flood engineer agree about the bend and part about the height, and the section above gives where. The river cuts the outer bank of a bend and builds the inner one, dropping what it carries on the inside as a point bar, the low, level, fertile ground in the belly of the belt that the classic wants a house on and the farmer wants a field on; beyond the bar the floodplain runs to the terrace, an older floodplain the river cut down from and no longer reaches, and beyond the terrace the hill. Leopold’s river puts its flood line over the bar and the plain once in a decade or once in a century, and the house in the belly of the bend, on the best land in the valley, is the first house under water. The classic does not mention the flood line, and the silence is not an oversight: it was written for people who had watched their river for a thousand years and buried their dead above it, and its houses in the belt stood on the terrace, inside the bend, with the water in front and the hill behind and the plain between as the bright hall, which is the engineer’s house exactly. What was lost in the move from the classic to the paperback is the height, because the paperback reads the form from a plan and the plain has no height on a plan. A reader choosing a site by water should ask two questions the classic assumed: which way the bend turns, which it teaches, and how high the water comes, which the flood map gives and the compass cannot. The choosing a home guide puts the map before the reading, and the outside page gives the garden’s version, the pond below the house and the house above the pond.

Reading water, in order

Which side of the bend. The belly toward the house, never the back; the inner bank grows and the outer bank goes.
How it arrives. Slowly, from the side or across the front; never straight at the door.
How it leaves. Out of sight, through a narrow place; never straight away in full view.
Two are better than one. A site in the fork of two waters, if the ground is high enough to be dry.
Still water in scale. A pool before the door, clean and not too near; a lake is for a village, a pond for a house, a bowl for a room.
Roads are rivers. Read the lane, the drive and the street by the same six forms, and stand on the inside of their bends.