LINPeiyuan,LIUTong,PENGShouhai,et al.Analysis of Drainage Network Defects in a Small-to-medium-sized City in the Yangtze River Basin[J].China Water & Wastewater,2026,42(10):31-38.
Analysis of Drainage Network Defects in a Small-to-medium-sized City in the Yangtze River Basin
China Water & Wastewater[ISSN:1000-4062/CN:12-1073/TU]
volume:
第42卷
Number:
第10期
Page:
31-38
Column:
Date of publication:
2026-05-17
- Keywords:
- drainage network; structural defects; functional defects; defect assessment; pipeline network operation and maintenance
- Abstract:
- To assess the overall health of drainage networks in small-to-medium-sized cities in China, defect detection data from the drainage system of a city in the Yangtze River basin were analyzed. The analysis focused on defect types, quantities, grades, average defect grade, defect density, spatial distribution, and regional differences. The results indicate that structural defects primarily consist of joint misalignments, corrosion, and fractures, accounting for nearly 80% of all defects. Functional defects are dominated by obstructions, sedimentation, and root intrusion, making up approximately 94%. The majority of defects are classified as grade 1 or 2, representing 84% to 90% of the total, with an average defect grade below 2, indicating a moderately healthy overall condition. The defect density is exceptionally high, reaching 100 to 200 defects per kilometer. Spatially, structural defects are concentrated near the top of the pipes, whereas functional defects are mainly found at the bottom. Furthermore, defect types are closely associated with surface loads, pipe materials, and fluid characteristics. The results provide a scientific basis for the regionalized and efficient management of drainage networks, the formulation of proactive maintenance strategies, and the development of defect remediation technologies.
Last Update:
2026-05-17