Hi,
i've made that changeset reading about what is stated in the wikipedia page and searching some documents.
"In its current structure this canal constitutes a branch of the Naviglio Civico of Cremona from which it divides – at Forcello di Fontanella - a few kilometers north of the Pianalto, but this condition certainly overlapped with a previous natural structure, which we saw being born among the bumps of the Pianalto a stream of spontaneous origins [...] It can be assumed that the connection of the primitive spontaneous river, forerunner of the Melotta branch, to what became the Naviglio Civico of Cremona, occurred with a general hydrographic reorganization of great importance part of the Cremonese plain".
Hope this help.
I used google translate, the original monografy is in italian. If you want to do a deep check i can link it to you.
Best regards