Monitoring is fundamental to reveal the state of the environment, understand hydrological processes, analyze trends and support policy development and its implementation. HYCLIC-LAB has developed a highly qualified expertise in hydrological monitoring and has a suite of advanced sensors for several hydrological variables. Our monitoring activity covers: 1. Precipitation by tipping-bucket rain gauges, X-Band Mini radars, weighting rain gauge and disdrometer; 2. Atmospheric variables including air temperature, relative humidity and pressure, wind direction and speed, and global solar radiation; 3. Soil Moisture by TDR and FDR probes; 4. Evapotranspiration by an Eddy Covariance Flux Tower; 5. Rainfall triggered landslide for early warning system by MEMS tilt sensors. MAJOR INSTRUMENTATION AND SENSORS: 1. A network of 18 tipping-bucket rain gauges (ISCO and TECNO PENTA M1 PLUV 1000 series) monitoring the area of Palermo; 2. two X-Band Mini radars (ENVI Sens Technologies, 9.41 GHz, peak power 10 kW, maximum range 30km); 3. A weighting rain gauge (OTT-Pluvio2 200); 4. An optical disdrometer (OTT-Parsivel2); 5. A Weather Station including: sensors for air temperature, relative humidity and pressure, a 3D sonic anemometer and a net radiometer; 6. Several Soil Moisture probes: TDR (Campbell CS650), FDR (Campbell EnviroSCAN) and a portable soil moisture probes; 7. An Eddy Covariance Flux Tower; 8. MEMS tilt sensors (Wisenet) for landslide monitoring.