A) The Tiber flow B) The works on the right branch C) The works on the left branch D) The images of the construction |
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A)
THE TIBER FLOW The control of the Tiber flow in the two branches at the island sides has been always a problem difficult to be solved. As detailed described in the monograph "Embankments", on the end of XVIII century, in order to control the river flow, it was proposed to eliminate the island ![]() ![]() The unbalanced water sharing in the two river branches caused the left branch to be earth filled due to meagre flow and, in the right one, the collapse of part of the new embankment just built, eroded by the high flow (1900). ![]() B) THE WORKS ON THE RIGHT BRANCH ![]() ![]() The "bridles" are still visible in the original position, while in 1994 the threshold has been moved downstream (pict.B2) creating the characteristic waterfall (see D1). ![]() C) THE WORKS ON THE LEFT BRANCH A threshold was built also in the left branch, with the purpose to balance the water flows, upstream Ponte Fabricio near Ponte Garibaldi. (pict.C1; see also B1 and B2) ![]() The works have been carried on in various steps during many years; in 2003 it has been undertaken the final phase with the realization of the mobile threshold and the conclusion of the project. The thresholds are also essential to limit the erosion of the riverbed, but due to them the Tiber will never be navigable in the island area: this is the price to pay for the solving of the river hydraulic problems around the Tiber Island. ![]() D) THE IMAGES OF THE CONSTRUCTION |