CALL FOR PROPOSALS TO THE "Regional Regional Development Plan of Eastern Macedonia and Thrace 2026-2030" IN THE PRIORITY AXIS: 3.4 "Risk prevention and management" WITH THE TITLE "CONSTRUCTION OF ANTI-FLOOD SHIELD OF CHRYSOCHORIO DITCH, HYDRAULIC REGULATION SYSTEM FOR THE MAINTENANCE AND OPERATIONAL READINESS OF AN EXISTING PUMPING STATION AND WATER USE FOR IRRIGATION"