Assessing cost-effectiveness of specific LID practice designs in response to large storm events

Chui, Ting Fong May; Liu, Xin; Zhan, Wenting

doi:10.1016/j.jhydrol.2015.12.011

Cited by 208 publications

(97 citation statements)

References 16 publications

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“…SWMM can be used for dynamic hydrology-hydraulic and water quality simulation and has been widely used in urban water system simulations throughout the world (Chui et al, 2016;Zhu et al, 2016). The SWMM model solved the Saint-Venant equations and modelling drainage system with dynamic wave, is suitable for urban drainage system in a community-scale in this study.…”

Section: Modelling the Urban Drainage System In Ynmentioning

confidence: 99%

Modelling the ability of source control measures to reduce inundation risk in a community-scale urban drainage system

et al. 2018

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Abstract. Urban inundation is a serious challenge that increasingly confronts the residents of many cities, as well as policymakers, in the context of rapid urbanization and climate change worldwide. In recent years, source control measures (SCMs) such as green roofs, permeable pavements, rain gardens, and vegetative swales have been implemented to address flood inundation in urban settings, and proven to be cost-effective and sustainable. In order to investigate the ability of SCMs on reducing inundation in a community-scale urban drainage system, a dynamic rainfall-runoff model of a community-scale urban drainage system was developed based on SWMM. SCMs implementing scenarios were modelled under six design rainstorm events with return period ranging from 2 to 100 years, and inundation risks of the drainage system were evaluated before and after the proposed implementation of SCMs, with a risk-evaluation method based on SWMM and analytic hierarchy process (AHP). Results show that, SCMs implementation resulting in significantly reduction of hydrological indexes that related to inundation risks, range of reduction rates of average flow, peak flow, and total flooded volume of the drainage system were 28.1-72.1, 19.0-69.2, and 33.9-56.0 %, respectively, under six rainfall events with return periods ranging from 2 to 100 years. Corresponding, the inundation risks of the drainage system were significantly reduced after SCMs implementation, the risk values falling below 0.2 when the rainfall return period was less than 10 years. Simulation results confirm the effectiveness of SCMs on mitigating inundation, and quantified the potential of SCMs on reducing inundation risks in the urban drainage system, which provided scientific references for implementing SCMs for inundation control of the study area.

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Section: Modelling the Urban Drainage System In Ynmentioning

confidence: 99%

Modelling the ability of source control measures to reduce inundation risk in a community-scale urban drainage system

et al. 2018

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“…Low impact development practices mainly include decentralized devices and objects whose operation is to imitate the natural hydrological processes taking place in the catchment such as infiltration, evaporation and the retention of rainwater. The benefits resulting from the implementation of LID practices (porous pavement, green roof, rain garden, harvesting system) have been presented in numerous publications [11][12][13][14][15][16][17][18][19][20][21].…”

Section: Introductionmentioning

confidence: 99%

Hydrodynamic modeling of the impact of residential rainwater harvesting systems on stormwater runoff and drainage networks

Stec

2018

E3S Web Conf.

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Abstract. This paper presents the results of hydrodynamic modeling of urbanized catchment, where rainwater harvesting systems (RWH) was applied. The catchment model was developed in the Storm Water Managment Model program and RWH was simulated as one of the LID practices available in this program -rain barrels (RB). The research was carried out for various rain barrels implementation scenarios (50% -100%) in a single-family housing estate. However, the results of the research showed that the use of rain barrels (RB) to capture rainwater discharged from the roof of buildings was not effective in significantly reducing the outflow of water from the catchment, and thus reducing the occurrence of pressure flows in the analyzed sewage system.

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“…A bioretention cell, also called a rain garden or a biofilter, is one low impact development practice that has been widely implemented. It has proved effective at reducing the total amount and peak flow of runoff, increasing the lag time, purifying polluted runoff, enhancing groundwater recharge, and replenishing base flow in different spatial scales, particularly for small storm events (Bhaskar, Hogan, & Archfield, 2016;Chui, Liu, & Zhan, 2016;Davis, 2008;Dietz & Clausen, 2005;Hunt, Jarrett, Smith, & Sharkey, 2006;Jarden, Jefferson, & Jennifer, 2016;Palanisamy & Chui, 2015;Trinh & Chui, 2013;Yang, Florence, McCoy, Dick, & Grewal, 2009). The surface area of a bioretention cell is typically about 5-15% of its catchment area (CVC and TRCA, 2010).…”

Section: Introductionmentioning

confidence: 99%

Evaluating hydrologic performance of bioretention cells in shallow groundwater

Zhang

Chui

2017

Hydrological Processes

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Bioretention cells, which are generally effective in controlling surface runoff and recharging groundwater, have been widely adopted as low impact development practices. However, shallow groundwater has limited their implementation in some locations due to the potential problems of a reduction in surface runoff control, groundwater pollution, and continuous groundwater drainage through the underdrain. Many guidelines have established minimum requirements for the groundwater depth below bioretention cells, but they may not be optimized for certain environmental conditions and bioretention cell designs. This study made use of a variably saturated flow model to examine the hydrologic performance of a single bioretention cell in shallow groundwater with event‐based simulations, considering a wide range of initial groundwater depths, media and in situ soil types, surface runoff loads, and underdrain sizes. Performance indicators (e.g., runoff reduction, time for infiltrated water to reach the bioretention cell bottom and the groundwater table, and height and dissipation time of groundwater mound) were evaluated to examine the processes of runoff generation, the formation and dissipation of groundwater mounds, and the bioretention cell's performance in a shallow groundwater environment. The most influential factors were the initial groundwater depth, the hydraulic conductivity of the media soil, and the rainfall runoff load. With a deeper initial groundwater table, infiltrated water took longer to reach the bioretention cell bottom and groundwater table. Groundwater mounds, however, took longer to dissipate even though they were smaller. The groundwater quality can be better protected if relatively less‐permeable soil types (e.g., sandy loam) are used as the media, although it may compromise the performance in runoff quantity control. However, only very high surface runoff loads would cause concerns regarding a reduction in runoff quantity control and possible groundwater contamination due to the shallow groundwater. A distance of 1.5–3 m between the bioretention cell bottom and the groundwater table is generally sufficient. The results of this study could help to guide the planning and design of bioretention cells in areas of shallow groundwater.

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Assessing cost-effectiveness of specific LID practice designs in response to large storm events

Cited by 208 publications

References 16 publications

Modelling the ability of source control measures to reduce inundation risk in a community-scale urban drainage system

Modelling the ability of source control measures to reduce inundation risk in a community-scale urban drainage system

Hydrodynamic modeling of the impact of residential rainwater harvesting systems on stormwater runoff and drainage networks

Evaluating hydrologic performance of bioretention cells in shallow groundwater

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