Labels:text | screenshot | font OCR: the most practical discussions and observations on this subject, beginning with the first two texts: All bridges crumble and collapse toward the oncoming water currents which percuss them above and dig out underneath. All weirs placed diagonally to a river crumble and fall along the rush of the current, away from the oncoming waters, and this because the water flowing over those weirs undermines their foundations." B Here Leonardo investigates the confluence of rivers, where floods and the interaction of currents may alter the water depth. He studies
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