Impact of roof surface runoff on urban water quality

Egodawatta, Prasanna; Miguntanna, Nadeeka Sajeewani; Goonetilleke, Ashantha

doi:10.2166/wst.2012.348

Cited by 13 publications

(4 citation statements)

References 17 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…This assumption is supported by the high loads of solutes that were measured at the four roofs monitored in the survey, which are all older than 10 years, excluding roof #4 (Table 1). Future studies should clarify this point, but old BS may emit higher loads of solutes and pollutants due to the natural aging of the BS, which accelerates the chemo-physical degradation process that leads to the release of various pollutants to the harvested rainwater [32][33][34]. This may be another explanation for the higher EC values measured at the old roofs that were surveyed compared to the EC readings of the first flushes generated in the rain simulator experiments from a new BS (Figures 1F and 10A-C).…”

Section: Results Integrationmentioning

confidence: 99%

“…These contaminates may include dust and atmospheric pollutants that settled down, birds and animal feces, and other organic components, such as leaves and dead rodents [26][27][28]31]. In addition, roof construction materials may also undergo various chemo-physical degradation process, which may lead to the release of various pollutants to the harvested rainwater [32][33][34].…”

Section: Rain Water Harvesting (Rwh) and Water Qualitymentioning

confidence: 99%

See 1 more Smart Citation

Dynamic Release of Solutes from Roof Bitumen Sheets Used for Rainwater Harvesting

Nachshon

Ben‐Hur

Kurtzman

et al. 2021

Water

View full text Add to dashboard Cite

Bitumen waterproof sheets are widely used to seal building roofs. Previous works have focused on the mechanical-physical properties of bitumen sheets, as well as their aging and degradation processes, and their impact on sealing properties of the buildings. Due to a growing need over recent years to use rooftops in urban environments for rainwater harvesting purposes, it is highly important to better characterize the quality of the harvested water from the bitumen covered roofs, and to shed more light on the impact of bitumen degradation processes on the release of various components to the harvested roof water. In the present study, the extracted organic and inorganic solutes from bitumen-covered roofs by water flow on the bitumen sheets were examined through a series of experiments, including measurements from the roofs of buildings in the center of Israel during the winter of 2019–2020. The results indicated high levels of organic and inorganic solute loads in the roof water during the first flush of the first rain of the winter, with maximal electric conductivity readings at the order of 4 dS/m. However, it was shown that following the first flush, a ~20 mm of cumulative rainfall was sufficient to wash off all the summers’ accumulated solutes from the roof. After this solute flushing of the roof, harvested rainwater along the winter was of good quality, with electric conductivity readings in the range of 0.04–0.85 dS/m. Moreover, it was shown that bitumen sheets which were exposed to direct sun radiation emitted greater loads of solutes, likely a result of elevated aging and degradation processes. The findings of the present research point to the need to find efficient ways to isolate roof bitumen sheets from direct sun radiation and to design rainwater harvesting systems that will not collect the water drained from the first flush.

show abstract

Section: Results Integrationmentioning

confidence: 99%

Section: Rain Water Harvesting (Rwh) and Water Qualitymentioning

confidence: 99%

Dynamic Release of Solutes from Roof Bitumen Sheets Used for Rainwater Harvesting

Nachshon

Ben‐Hur

Kurtzman

et al. 2021

Water

View full text Add to dashboard Cite

show abstract

“…2,3,5,7,9 Rainwater can be contaminated by air pollutants and the addition of contaminants deposited on roofs, which can represent a further source of harmful substances; roof surfaces thus influence the composition in urban runoff. [37][38][39][40][41] In urban areas, tiles can accumulate pollutants on the outer surfaces and earlier work 10 suggested that calcium and sulphate were especially available as solutes in runoff water.…”

Section: Runoff Compositionmentioning

confidence: 99%

Mobilisation of trace elements on roofing tiles

Sulaiman

Brimblecombe

Grossi

2014

Indoor and Built Environment

View full text Add to dashboard Cite

Roofs surfaces are frequently used to catch water for drinking in many countries, so the presence and mobilisation of material into runoff water can be an important process to consider. This paper investigates the origin and mobilisation of trace elements from roofing tiles. Our work suggests that trace elements can mobilise into roof runoff. However, lead by contrast, appears to have accumulated at the surface of tiles exposed to busy automobile traffic that used leaded fuel (confirmed by X-ray fluorescence). Although lead is relatively immobile on the tile surface, the potential for leaching by acidic rain (pH < 4) means that the guidelines for lead in drinking water may be exceeded during some rainfall events

show abstract

“…In this respect, in-depth knowledge of processes is a key requirement which consequently demands measurement data. In recent years much effort has been spent to investigate the influence of meteorological influences and catchment characteristics on stormwater quality based on samples at small sites [3][4][5]. Additionally, online turbidity measurements have been successfully used for intra-event analyses in larger catchments [6,7].…”

Section: Introductionmentioning

confidence: 99%

Stormwater Pollutant Process Analysis with Long-Term Online Monitoring Data at Micro-Scale Sites

Leutnant

Muschalla

Uhl

2016

Water

View full text Add to dashboard Cite

Stormwater runoff quality was measured with online turbidity sensors at four common types of small urban subcatchments: (i) a flat roof; (ii) a parking lot; (iii) a residential catchment; and (iv) a high-traffic street. Samples were taken to estimate site-specific correlations between total suspended solids (TSS) and turbidity. Continuous TSS time series were derived from online turbidity measurements and were used to estimate event loads and event mean concentrations. Rainfall runoff event characteristics were subjected to correlation analysis to TSS loads. Significant correlations were found for rainfall intensities at sites with high imperviousness and decrease with increasing catchment size. Antecedent dry weather periods are only correlated at the parking lot site. Intra-event TSS load distributions were studied with M (V)-curves. M (V)-curves are grouped at runoff quantiles and statistically described with boxplots. All sites show, in general, a more pronounced first-flush effect. While wash-off of the flat roof tends to be source-limited, the parking lot and high-traffic street sites show a more transport-limited behavior. Wash-off process of the residential catchment appears to be influenced by a composition of different subcatchments.

show abstract

Impact of roof surface runoff on urban water quality

Cited by 13 publications

References 17 publications

Dynamic Release of Solutes from Roof Bitumen Sheets Used for Rainwater Harvesting

Dynamic Release of Solutes from Roof Bitumen Sheets Used for Rainwater Harvesting

Mobilisation of trace elements on roofing tiles

Stormwater Pollutant Process Analysis with Long-Term Online Monitoring Data at Micro-Scale Sites

Contact Info

Product

Resources

About