Haoyu Tang
The University of Hong Kong
| Subject Areas: | Dry Weather Flow, Illicit Discharge, Source Tracing, Separate Stormwater Drainage Systems |
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ABSTRACT:
This dataset provides paired water quality and flow observations of dry weather flow (DWF) in separate stormwater drainage systems in Hong Kong, addressing the limited spatiotemporal resolution and restricted public availability of existing DWF records. The monitored area comprises four small urban sub-catchments and the open channel receiving their discharges; site coordinates are given in a local relative system.
Grab sampling yielded 51 samples along the DWF pathway: 11 from potential DWF sources (December 2025), 28 at drainage outlets (October 2024 and March 2026) and 12 at upstream and downstream channel sites (March 2026). Up to 16 parameters were determined per sample, through on-site measurement and volumetric flow gauging together with laboratory analysis of 11 analytes following APHA and USEPA methods with stated limits of reporting. Continuous monitoring produced six site–phase series at 1-minute resolution: one outlet over 37 days (February–March 2025), and four outlets plus the upstream channel site over 137–150 days (November 2025 – March 2026), each recording temperature, electrical conductivity, pH, turbidity, ammonia-nitrogen and water level, with derived flow rate at the outlets. Both raw and cleaned series are distributed, alongside co-located 1-minute rainfall.
Supporting files document sampling locations, methods, sensors, the campaign timeline, known data issues, sub-catchment and pipe-network attributes and flow calibration, and include the code implementing the automated cleaning steps. The dataset provides a basis for a wide range of DWF studies. A data descriptor is under preparation.
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Created: Aug. 28, 2026, 3:38 a.m.
Authors: Tang, Haoyu · Xiong, Chuyu · Yang Yang · Boji Chen · Mengxiang Zhang · Yue Wang · Ting Fong May Chui
ABSTRACT:
This dataset provides paired water quality and flow observations of dry weather flow (DWF) in separate stormwater drainage systems in Hong Kong, addressing the limited spatiotemporal resolution and restricted public availability of existing DWF records. The monitored area comprises four small urban sub-catchments and the open channel receiving their discharges; site coordinates are given in a local relative system.
Grab sampling yielded 51 samples along the DWF pathway: 11 from potential DWF sources (December 2025), 28 at drainage outlets (October 2024 and March 2026) and 12 at upstream and downstream channel sites (March 2026). Up to 16 parameters were determined per sample, through on-site measurement and volumetric flow gauging together with laboratory analysis of 11 analytes following APHA and USEPA methods with stated limits of reporting. Continuous monitoring produced six site–phase series at 1-minute resolution: one outlet over 37 days (February–March 2025), and four outlets plus the upstream channel site over 137–150 days (November 2025 – March 2026), each recording temperature, electrical conductivity, pH, turbidity, ammonia-nitrogen and water level, with derived flow rate at the outlets. Both raw and cleaned series are distributed, alongside co-located 1-minute rainfall.
Supporting files document sampling locations, methods, sensors, the campaign timeline, known data issues, sub-catchment and pipe-network attributes and flow calibration, and include the code implementing the automated cleaning steps. The dataset provides a basis for a wide range of DWF studies. A data descriptor is under preparation.