Stormwater hydrographs simulated for different structures of urban drainage network: dendritic and looped sewer networks

ABSTRACT

Despite urban drainage pipe networks being of great significance to urban flood control, few studies have focused on the influence of urban drainage pipe network structure on hydrological response. We studied two areas in downtown Dongying, Shandong Province, China, which have dendritic and loop drainage pipe networks, respectively. The loop network was converted to a dendritic system for scenario analysis using numerical simulation. Comparing the hydrological response of the original drainage system and the converted system showed that although the dendritic network could reduce node flood volume, the dendritic pipe overload situation was inferior to the loop network. Runoff in the former network was predominantly concentrated in the main pipes and near the outlets and the discharge-peak at the outlet was 47.0% greater than that of the loop. Thus, the loop drainage pipe network is more likely to reduce peak runoff at the outlet, which helps decrease flood risk.

KEYWORDS:

• Drainage pipe network
• hydrological response
• urban flood
• rain-runoff
• hydrological model

Disclosure statement

No potential conflict of interest was reported by the authors.

Additional information

Funding

This research was funded by the National Natural Science Foundation of China [No. 51739011 and 51879274], Chinese National Key Research and Development Program [No. 2016YFC0401401 and 2018YFC1508203]. The research was also supported by Research Fund of the State Key Laboratory of Simulation and Regulation of Water Cycle in River Basin [No. SKL2020ZY03].