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Article

Evaluating Efficiency Improvement of Deep-Cut Curb Inlets for Road-Bioretention Stripes

1
College of Hydrology and Water Resources, Hohai University, Nanjing 210098, China
2
Changzhou Urban Flood Control Management Office, Changzhou 213000, China
3
Changzhou Branch of Jiangsu Hydrology and Water Resources Survey Bureau, Changzhou 213022, China
4
Department of Civil and Environmental Engineering, Auburn University, Auburn, AL 36849-5337, USA
*
Author to whom correspondence should be addressed.
Water 2020, 12(12), 3368; https://doi.org/10.3390/w12123368
Received: 28 October 2020 / Revised: 23 November 2020 / Accepted: 28 November 2020 / Published: 30 November 2020
(This article belongs to the Special Issue Urban Rainwater and Flood Management)
Making a deep cut on the curb inlet has been used in some sponge-city (SPC) projects for road-bioretention stripes to manage stormwater runoff since they were easily implemented in the field. The efficiencies of the deep-cut curb inlets in those projects were unknown for lacking equation to evaluate their efficiencies. Two kinds of retrofit scenarios are commonly used: (1) The curb-cut cases when the deep cut is made only over the width of the curb inlet; (2) the road-curb cut cases when both the curb inlet and a small part of the road surface have a deep cut. An updated two-dimensional flow simulation program, FullSWOF-ZG, was used to determine two important parameters in road curb inlet design: The 100% interception curb inlet lengths (LT) and the curb inlet efficiencies (Eci). Eight-hundred retrofit modeling cases were compared with the no-cut cases to quantify the efficiency improvement of the deep-cut curb inlets. The simulation results show both LT and Eci of the curb-cut cases do not improve much. This case study with limited combinations of longitudinal and cross slopes and inlet lengths demonstrated that Eci of the road-curb cut cases improves to a large extent so that they can be used in the SPC projects and other urban drainage projects to reduce the flooding potentials. A general equation used to design and evaluate the road-curb cut inlets can be developed based on more simulation cases with a wide range of input parameters in a future study. View Full-Text
Keywords: stormwater management; deep-cut curb inlet; two-dimensional overland flow; curb inlet efficiency; road-bioretention stormwater management; deep-cut curb inlet; two-dimensional overland flow; curb inlet efficiency; road-bioretention
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MDPI and ACS Style

Li, X.; Wang, C.; Chen, G.; Wang, Q.; Hu, Z.; Wu, J.; Wang, S.; Fang, X. Evaluating Efficiency Improvement of Deep-Cut Curb Inlets for Road-Bioretention Stripes. Water 2020, 12, 3368. https://doi.org/10.3390/w12123368

AMA Style

Li X, Wang C, Chen G, Wang Q, Hu Z, Wu J, Wang S, Fang X. Evaluating Efficiency Improvement of Deep-Cut Curb Inlets for Road-Bioretention Stripes. Water. 2020; 12(12):3368. https://doi.org/10.3390/w12123368

Chicago/Turabian Style

Li, Xiaoning, Chuanhai Wang, Gang Chen, Qiang Wang, Zunle Hu, Jinning Wu, Shan Wang, and Xing Fang. 2020. "Evaluating Efficiency Improvement of Deep-Cut Curb Inlets for Road-Bioretention Stripes" Water 12, no. 12: 3368. https://doi.org/10.3390/w12123368

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