The wind has a similarity with the movement of water. What difference is there between water that is pulled and water that is pushed? Pulled water is when the Ocean sea, in its ebbing, draws behind it the water of the Mediterranean sea. Pushed water is that of the rivers which, emptying into the sea, push forward their water.

To know where the water weighs (is heaviest).

Look at the rivers from their beds along the bank. * Fire is summoned by nourishment, and water by lowness. Nourishment is disunited and separate, and fire dies where nourishment is lacking. The slope of the valleys is united, and united will be the harm along the course of the river, until it ends with its river at the sea, its sole repose. * The sloping plains end, along the course of their rivers, at the sea, the universal lowness and sole repose of the wandering waters of the rivers. * If the fire is nourished by timber, the movement of water is maintained by the sloping plain, which ends at the sea-shore, and there the motion of the rivers ends. Taking from men all the light things able to accompany its fury, and undermining the heavy ones. The universal movement of water, its bed being equal, will have so much greater flow in one place than another as its pool or river has narrower banks. The river of equal bed will have so much more rushing in the narrows than in the wider place, as the lesser width enters into the greater. So much ...

Water from Santo Storzo.

The tumultuous ... The stone makes greater noise in its bounce, because it takes a second movement, which derives from motion and blow. Among the things that above all others must be feared by men is the ruinous inundation of the flowing rivers. It seems to me that among fearful, harmful things the primacy is held by the inundation of rivers, which with irreparable impetus damage human goods and with ruinous downfall spoil human goods. It seems to me that ... terror / nefarious / inexorable / the horrible and shattering / sudden / precipitating. Among the harmful causes of human goods, it seems to me the rivers with their excessive and impetuous inundations hold the primacy. And if anyone would set fire above the fury of the ruinous rivers, it would seem to me that such people have a dearth of good judgement, for fire remains ended and dead where it lacks nourishment, but against the irreparable inundations of the swollen and proud rivers no human defence of human counsel avails; rather, in company with the turbulent and tumultuous waves, gnawing and ruining the high banks and growing turbid with the cultivated possessions, undermining the houses, uprooting the tall plants, it carries these as prey to the sea, its repose, carrying with it men, plants, beasts, farms and possessions; ruining every bank and other defences, it carries with it the light things and ruins and spoils the heavy ones, making of small fissures great collapses, filling the low valleys with floods and with noisome and rigid waters precipitating. How much such a neighbour is to be fled! O how many cities, how many lands, castles, villages and houses it has consumed! O how many labours of the troubled farmers have been vain and without fruit! O how many families it has undone and submerged! What shall I say of the drowned and lost herds? And often, issuing from its ancient and stony beds, it washes away the cultivated fields.