Now a days, national enterprise of the sewage network remediation has been widely carried out in Korea. For the evaluation of the enterprise, 3 example sites in Gangjin - Gun of Jeollanam - Do were choosen and the sewage flow, the infiltration and the inflow were analyzed in this study. By the increase of collecting rate, the daily average sewage flow of the sites were increased as much as 5 - 31% after the remediation of sewage network. The daily peak flow was occured twice a day in the moring and in the evening whereas weekly discharge pattern was not observed. By the remediation enterprise, the infiltrations were reduced as low as 0.4 - 12%P for the 3 sites and the inflow also reduced as low as 0.2 - 0.9% of the daily maximum sewage flow. In this case of sewage network remediation enterprise, the daily average sewage flow was increased and the infiltration and the inflow was reduced. It was because the groundwater inflow was minimized by the fixation of the broken pipe. Likewise, the cross-connection problem which was common in the separate sewage system was corrected by the enterprise.