Evaluation of the capability of low-impact development practices for the removal of heavy metal from urban stormwater runoff

In order to know the characteristic of spatial and temporal distribution of heavy metal concentrations in urban stormwater runoff, rainfall runoff from impervious underlying surfaces in urban region was observed during rain events. Results showed that during the precipitation process, heavy metal concentrations decreased gradually temporally (except Cd); concentrations of Fe, Cu and Zn meet Class III standard of Environmental Quality Standards for Surface Water in terminal runoff, but concentrations of Cd and Pb go beyond this standard far. Heavy metal concentrations in runoff from different types of landuses were significantly different. The arithmetic average concentrations of Fe, Cd, Cu and Zn in stormwater runoff from roof (e.g.,34.4mg/L, 0.15mg/L, 1.25mg/L and 1.23mg/L, respectively) were obviously higher than that in stormwater runoff from road (e.g., 11.8mg/L, 0.05mg/L, 0.13mg/L and 0.69mg/L, respectively).

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Urban stormwater runoff thermal characteristics and mitigation effect of low impact development measures

Journal of Water and Climate Change ◽

10.2166/wcc.2018.145 ◽

2018 ◽

Vol 10 (1) ◽

pp. 53-62 ◽

Cited By ~ 1

Author(s):

Junqi Li ◽

Yongwei Gong ◽

Xiaojing Li ◽

Dingkun Yin ◽

Honghong Shi

Keyword(s):

Retention Volume ◽

Low Impact Development ◽

Stormwater Runoff ◽

Thermal Characteristics ◽

Weather Conditions ◽

Vegetative Cover ◽

Urban Stormwater ◽

Open Graded Friction Course ◽

Urban Stormwater Runoff ◽

Land Surfaces

Abstract Thermal pollution has become a severe environmental problem in China, but studies on thermal characteristics of urban stormwater runoff are scarce. The thermal enrichment of runoff from typical land surfaces was assessed during 2012–2014 in Beijing and Shenzhen, China. The temperature of stormwater runoff from rooftops, grass surfaces and different types of road surfaces was investigated under different rainfall conditions. The mitigation effects of low impact development (LID) measures were also evaluated. Impervious asphalt or concrete surfaces store and transfer heat, and were found to cause thermal enrichment of runoff from the start of a rainfall event. In addition to surface types, pre-event weather conditions and rainfall intensity influenced runoff temperature. The pervious surface of open graded friction course (OGFC) pavement postponed the time of peak runoff temperature. The retention volume of bioretention cells resulted in thermal energy mitigation by directing runoff into the soil and vegetative cover. The grass swales showed effective reduction of runoff temperature by approximately 1–2°C compared to asphalt, concrete and marble pavements. Therefore, LID measures, such as OGFC porous pavements, bioretention cells and grass swales, can mitigate the thermal impacts of urban stormwater runoff and alleviate resulting ecological problems.

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Temporal variation of heavy metal pollution in urban stormwater runoff

Frontiers of Environmental Science & Engineering ◽

10.1007/s11783-012-0444-5 ◽

2012 ◽

Vol 6 (5) ◽

pp. 692-700 ◽

Cited By ~ 29

Author(s):

Wen Li ◽

Zhenyao Shen ◽

Tian Tian ◽

Ruimin Liu ◽

Jiali Qiu

Keyword(s):

Heavy Metal ◽

Temporal Variation ◽

Metal Pollution ◽

Heavy Metal Pollution ◽

Stormwater Runoff ◽

Urban Stormwater ◽

Urban Stormwater Runoff

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A Review of Green Roof Applications for Managing Urban Stormwater in Different Climatic Zones

Sustainability ◽

10.3390/su10082864 ◽

2018 ◽

Vol 10 (8) ◽

pp. 2864 ◽

Cited By ~ 22

Author(s):

Musa Akther ◽

Jianxun He ◽

Angus Chu ◽

Jian Huang ◽

Bert van Duin

Keyword(s):

Review Paper ◽

Low Impact Development ◽

Green Roof ◽

Stormwater Runoff ◽

Green Roofs ◽

Influential Factors ◽

Urban Stormwater ◽

Climatic Zones ◽

Typical Type ◽

Urban Stormwater Runoff

Many regions have turned to low impact development technologies (LIDs), which are implemented to restore the changes in stormwater runoff that have resulted from urbanization. Green roofs are one typical type of LID. Until now, many studies have validated their roles in managing urban stormwater runoff. However, they have also revealed that the performance of green roofs largely varies with their design configuration, as well as their hydro-climatic exposure. The objectives of this review paper are to statistically synthesize the effects of the influential factors, including design and hydrologic variables, on green roof performance and to explore their effects in different climatic zones. The review’s results confirm the differences in the influential variables and, thus, the performance of green roofs in different climatic zones. These are the barriers to knowledge translation among engineering designers, stormwater managers, and policymakers in different climatic zones when implementing green roofs. Consequently, region- or site-specific studies are necessary to implement green roofs with confidence.

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