Public Works Department, Taipei City Government

The Hydraulic Engineering Office of Taipei City is actively promoting the stormwater drainage renewal project. Mayor Wan-An Chiang specially led a team of various city officials today (6/5) to inspect the maintenance of the stormwater drainage system in Lane 91, Section 1, Neihu Road, Neihu District.

Since 1961, when the construction of the city's drainage district and pumping station were completed, Taipei City has accomplished 716 kilometers of stormwater drainage projects, which is the longest in Taiwan. According to the Hydraulic Engineering Office, stormwater drainage is an important part of the city's drainage system. Stormwater drainage is just like the blood vessels in the human body, supporting the cleaning of the city during heavy rains and any clogging or damage in any one place will affect the city's flood prevention and safety.

Therefore, in order to improve the drainage function for sewers (old boxes and culverts), the Hydraulic Engineering Office actively promotes the stormwater drainage renewal project to ensure the soundness of old boxes and culverts, to strengthen the structure of stormwater drainage works and to increase the life span of existing hydraulic facilities to maintain the normal operations of the drainage system and to reduce the risk of flooding in the Taipei City.

The Hydraulic Engineering Office pointed out that in order to maintain the soundness of old boxes and culverts, the annual storm sewer structural repair and maintenance works (citywide) and stormwater drainage structural repair works (in each district) are organized every year. At the same time, the City improves the concrete wall weakening and spalling repair works and steel corrosion works in order to make these aged urban pipes stronger. The sewer renovation of Lane 91, Section 1, Neihu Road, Neihu District is particularly interesting. After evaluating the traffic, pipelines and system deficiencies, the Water Resources Department adopted the SPR method, which is different from the traditional repair method, to rebuild the underground box and culvert that originally needed to be excavated and rebuilt. This method overcame the dilemma of difficult excavation, had the advantages of fast and short construction time and also compensated for the lack of structural performance, while meeting the hydrological performance requirements, which helped to improve flood control and safety, as well as construction efficiency and environmental friendliness.

The Stormwater Drainage Management Section of the Hydraulic Engineering Office explains that, especially in Taipei City, there are often afternoon rainstorms in summer and fall, which makes the effectiveness of the drainage of sewers more challenging. The construction of stormwater drainage in Taipei City has gone through careful planning and design, calculating the maximum flow rate and the optimum flow direction to maintain optimum flexibility all the time in order to minimize flood damage when heavy rains and typhoons come to maintain a worry-free operation of the City.