Mills are not to be built in ponds or on the sea, because the storm fills with sand every canal that is made along their shores. In regulating, a rule.

If a at 2 moves b to f by its descent to c, and 4 by its descent to d, it will move b twice the space b f. Therefore it will go to g.

The wave of the bank that bounds the rivers which flow across the widths of the valleys, winding from one mountain to the opposite one .... The courses of rivers, across the widths of their valleys, go winding from one mountain to the other, striking and consuming their roots. The wave made by the sinuosities of rivers along their valleys consumes the roots of the mountains and widens those valleys; it moves following the flight of the water, and over a length of time it searches out the length of that valley, if it is not impeded. The waves that the banks of the sinuosities of rivers make consume the roots of the lateral mountains, and continually widen their valleys ...

The waves that the banks make, between which the sinuosities of rivers flow, move following the flight of the water, and over a length of time search out the width and length of the whole valley, continually increasing it in width and length ... The winding course of rivers makes the banks winding, which banks travel along the direction of the river, and over a length of time search out the whole valley, increasing it both in width and in length. The winding course of rivers that strike and consume the roots of their lateral mountains, striking against the one and rebounding against the other, makes the banks winding. This sinuosity moves following the course of the river, and over a length of time increases the length and width of its valley. The sinuosity of rivers, which strike on one side and consume the roots of the one mountain, is reflected back to the roots of the opposite mountain. The meanderings that rivers make along their valleys, striking and consuming the roots of the mountains, rebounding from one to the opposite, make their banks winding; this sinuosity, over a length of time, searches out the whole valley, increasing it in depth, width and length, beginning the same process again from the start until it consumes the lateral mountains. The meanderings that the courses of rivers make along their valleys, striking and consuming the roots of the lateral mountains .... The meanderings that rivers make along their valleys, rebounding from one mountain to the other, make the banks winding; this sinuosity moves together with the river and over a length of time searches out the whole valley, increasing it in length and depth, and diminishing it in width.