Waterworks monitoring system aiming at identifying and localizing possible leaks, which comprises: (i) a plurality of sensors for measuring pressure and flowrate, installed in various points of a water distribution system; (ii) connectors configured so that the value of the measure carried out by each one of said sensors is detected and transmitted to remote computing means; (iii) remote computing means on which it is implemented an algorithm for analyzing the values detected by said sensors, said computing means having access to a database on which there are configured descriptive information about said waterworks, on said computing means being loaded calculating models configured so that the hydraulic functioning of said waterworks is simulated, by calculating flowrates and pressures in the various network pipes; said system being configured to determine and localize the presence of a leak as a function of the deviation between pressure and flowrate values detected by said sensors and the corresponding pressure and flowrate values calculated by means of said calculating models characterized in that said sensors for measuring pressure are sensors in which the sensible element is a Bragg grating, photo-etched on an optical fiber said monitoring system further comprising - at least an optical fiber in which Bragg gratings are photo-etched at the sensors; - at least a wide band light source configured to illuminate said optical fiber; - at least an optical spectrum analyzer to analyze the light reflected by said sensors, through said optical fiber And in that said sensors for measuring pressure comprise a membrane on which it is glued an optical fiber with a Bragg grating photo-etched thereon, so that the deformation of the grating is a function of the membrane deformation, said membrane being positioned inside a hollow element fastened to the pipe of said waterworks, so that the membrane is exposed to water pressure. (i) a plurality of sensors for measuring pressure and flowrate, installed in various points of a water distribution system; (ii) connectors configured so that the value of the measure carried out by each one of said sensors is detected and transmitted to remote computing means; (iii) remote computing means on which it is implemented an algorithm for analyzing the values detected by said sensors, on said computing means being loaded calculating models configured so that the hydraulic functioning of said waterworks is simulated, by calculating flowrates and pressures in the various network pipes; said system being configured to determine and localize the presence of a leak as a function of the deviation between pressure and flowrate values detected by said sensors and the corresponding pressure and flowrate values calculated by means of said calculating models characterized in that said sensors for measuring pressure are sensors in which the sensible element is a Bragg grating, photo-etched on an optical fiber said monitoring system further comprising - at least an optical fiber in which Bragg gratings are photo-etched at the sensors; - at least a wide band light source configured to illuminate said optical fiber; - at least an optical spectrum analyzer to analyze the light reflected by said sensors, through said optical fiber And in that said sensors for measuring pressure comprise a membrane on which it is glued an optical fiber with a Bragg grating photo-etched thereon, so that the deformation of the grating is a function of the membrane deformation, said membrane being positioned inside a hollow element fastened to the pipe of said waterworks, so that the membrane is exposed to water pressure. - at least an optical fiber in which Bragg gratings are photo-etched at the sensors; - at least a wide band light source configured to illuminate said optical fiber; - at least an optical spectrum analyzer to analyze the light reflected by said sensors, through said optical fiber And in that said sensors for measuring pressure comprise a membrane on which it is glued an optical fiber with a Bragg grating photo-etched thereon, so that the deformation of the grating is a function of the membrane deformation, said membrane being positioned inside a hollow element fastened to the pipe of said waterworks, so that the membrane is exposed to water pressure.