Open Procedure Pursuant To Art. 71, Paragraph 3 Of Legislative Decree N. 36/23 And Ss.Mm.Ii., Entirely Electronic, For The Assignment Of The Works For The Irrigation System Plateau Island Rizzuto And Tacina Valley Valley- Rationalization Interventions, Functional Adjustment And Safety Of The Main Hydraulic Nodes Of The System And Arrangement Of Some Features Of Existing Pipelines Bewitched