Quotation from: The Notebooks of Leonardo Da Vinci

Written by: Leonardo da Vinci

Let the width of the streets be equal to the average height of the
houses.

747.

The main underground channel does not receive turbid water, but that
water runs in the ditches outside the town with four mills at the
entrance and four at the outlet; and this may be done by damming the
water above Romorantin.

[11]There should be fountains made in each piazza[13].