The Veio Regional Natural Park stretches over 15,000 hectares in the north of Rome. Typical for this recreation-area is the dense network of water ditches that run into the Tiber. Uncontrolled wastewater disposal due to the increasingly urbanized area has however become a threat to the watercourses. In order to main- tain the natural park’s integrity, the basin of the largest ditch, the Fosso della Cresczenza, would have to be rehabilitated

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