Construction of semi-main lines of Kashan sewage network located in zone B1

Implementation of the main, semi-main and secondary sewer lines using tunnels and open trenches with double-walled polyethylene pipes of 200 to 400 mm diameter and 38 km long, construction of 904 prefabricated concrete manholes and the implementation of sewer branches. 110, 125 and 160 mm thick with push-fit UPVC pipes along with the installation of all connections and accessories including: branching kit, elbow, siphon, cover, plastic cap