The "fontanili" (spring waters)
are a distinctive characteristic of the Lombardy lowland, that just for
the abundance of water has always been fecund and particularly proper
to the agriculture. From the point of geological sight, it comes divided
in "tall lowland" and "low lowland."
The cellar of the tall lowland is corporate from coarse gravels deposed
in the quaternary period to the feet of the Alps, whose granulometry and
permeability decrease toward south. The cellar of the low lowland is instead
composed from sediments prevalently thin. In the band of transition among
the two lowlands, where the thinner fractions start to be present in remarkable
proportions, the waters of the stratums rise owing to the regurgitation
aroused from the diminution of permeability. The waters that erupt in
surface are said "resurgent" and the depressions where disgorges buys
the name of "fontanili".They are waters that, originating from the subterranean
stratum, they maintain an abiding temperature all the course of the year
(around to the 10/ 14 °C) and they of consequence don't freeze in the
winters months. This continues font of water relatively hot it has been
an of the foreground reasons of the development of a very lucrative agriculture
in the Padana Lowland; the "marcite", exemplary cultivations of forage
to elevated productiveness, they were chiefly you feed with spring waters.
The abiding temperature, the transparency and the course always regulate
of the spring waters allows the development of an aquatic botany of the
all distinctive among the other and of an extremely rich and changed fauna.
In the only province from Milan is present around 600 "fontanili", from
which takes origin a system of little canals "rogge" that the irrigation
of vast agricultural areas consents. The same city from Milan has risen
in correspondence of the band to taller denseness of resurgent. Yet also
the "fontanili" have suffered the consequences of an irrational custom
of the water from part of the man. The lowering of the stratum, happened
around the sixty years, in fact, drained a tall percent of the Milanese
and Lombards "fontanili".