Abstract
The management of combined sewer overflows (CSOs) has emerged as a key urban challenge. The current 3Q design standard permits overflows assuming rainfall dilution, but its actual effectiveness requires evaluation. This study analyzed CSO runoff characteristics using five years (2020–2024) of real-time total phosphorus (T-P) and rainfall data from the Tancheon basin in S city. Results revealed that during the spring season, when less rainfall occurs, (March–May), a strong first flush effect led to highly concentrated discharges (up to 3.77 mg/L), exceeding the effluent standard (0.5 mg/L) by up to 7.5 times. These findings clearly demonstrate the fundamental limitations of the current 3Q design standard.
| Translated title of the contribution | Analysis of Runoff Characteristics of Combined Sewer Overflows (CSOs) Based on Tancheon Water Quality Monitoring and an Empirical Study of Current Design Standards |
|---|---|
| Original language | Korean |
| Pages (from-to) | 95-101 |
| Number of pages | 7 |
| Journal | 한국습지학회지 |
| Volume | 28 |
| Issue number | 2 |
| DOIs | |
| State | Published - 2026 |
Keywords
- Combined Sewer Overflows (CSOs)
- Combined sewer system
- Non-point source pollution
- Pollution load
- Tancheon Stream
- Total Phosphorus (T-P)
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