Near the second "butto
" there is
a cistern for the collection of rain water, later cut into
for the staircase of the wine cellar
This large reservoir dates to Etruscan times, as indicated
by the waterproofing plaster still visible on the inner
wall built with well-ground terracotta fragments mixed with
lime, according to a tech-nique called "cocciopesto".
Water was collected from the roofs and was carried through
terra cotta tubes [like those exhibited at the bottom of
the cistern] to the reservoir after passing through a layer
of filtering material.