Item inter actus ducentos non est inutile castella conlocari, ut, si quando vitium aliqui locus fecerit, non totum onus neque opus contundatur et, in quibus locis sit factum, facilius inveniatur; sed ea castella neque in decursu neque in ventris planitia neque in expressionibus neque omnino in vallibus, sed in perpetua aequalitate.
Again, it is not without advantage to put reservoirs at intervals of 200 actus (24,000 feet), so that if a fault arises anywhere, neither the whole load of water nor the whole structure may be disturbed, but it may be more easily found where the fault is. But these reservoirs are to be neither in the descent nor on the level portion of the bend, nor on the rise, nor generally in valleys, but on unbroken level ground.
final_alignments\Vitruvius_Architecture_Book_8.json