The purpose of the project is to increase the useful life of the collector, to guarantee its functionality even when the flows are increased, once the works of optimisation of the sanitation are carried out in the municipality of Seville, for this it is essential to define and evaluate the works necessary for the rehabilitation of the S-100 and S-200 collectors, within the works of ADECUACIÓN DEL TRATAMIENT DE LAS EDAR DE SEVILLA FOR VERTIDO TO SENSIBLE ZONE IN THE ENTORNO DE DOÑANA. COLLECTOR EMISSARY PORT, AREA OF PALMAS ALTOS, SURROUNDINGS OF THE GUADAÍRA RIVER AND LEFT BANK OF THE DOCK OF THE GUADALQUIVIR RIVER. (Lot 1: PK 0+ 000 to 2+ 100, LOTE 2: PK 3+ 127 AL 4+ 343 and Lot 3: PK 7+ 200 to 12+ 284).