The Integrated Pollution Control System of the Ave Valley (SIDVA) is especially vulnerable to infiltration of groundwater / storm since it presents considerable extensions of collectors installed in riverbeds and collects wastewater and undue inflows of systems in low from five municipalities of the river Ave watershed. The operational management of this complex system involving decision variables such as the selection of the treatment plant where wastewater collected will be treated, with implications for pumped volumes and consequently the energy consumption, detection and correction of anomalies after intense rainfall events and in extreme situations the decision on volumes to discharge untreated volumes of wastewater. Apart from undue natural inflows the system collects wastewater that result from not registered users. Aiming to reduce these inflows TRATAVE S.A. drew up a monitoring plan that includes the entire drainage network and treatment operated by the company. The work presented focuses on a drainage sub-basin and presents monitoring equipment solutions and respective methodology selection of installation sites, as well as calibration methodology aided by hydrodynamic modeling tools.