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Stormwater - DOAJ

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Last Updated: 05 January 2023

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Case Study of Modular Pre-cast Concrete On-Site Stormwater Detention System during Monsoon Season in Southeast Asia

A residential property's on-site stormwater detention system is intended for a temporary storage of stormwater inside the property lot to prevent flash floods, particularly during the rainy seasons brought by the northeast monsoon. The system was able to drain water from a 95 m2 house roof via 0. 1 m diameter pipe and released water via 0. 05 m diameter pipe. Another four historical storm events that coincided with the monsoon from 2015-2017 were sourced to support the report. Using the six observed events, a computer model built using the storm water management model was calibrated and verified. The Kolmogorov-Smirnov goodness of fit tests between the observed and modelled cumulative distances between the observed and modelled cumulative distributions had reported 0. 01 percentu20130. 14 maximum vertical distances that were lower than the 0. 41. 36 critical values indicating close matches.

Source link: https://doaj.org/article/cbb43cabe0414157b27f3e551247b564


A Review of Pollutant Concentrations in Urban Stormwater Across Eastern Australia, After 20 Years

In the early 1970s, first questions regarding pollutants in urban stormwater were first raised. Urban stormwater runoff contained elevated amounts of sediment and nutrients, as well as heavy metals, which brought stormwater control to the forefront for regulators decades later. Low-impact design and Sustainable Urban Design solutions were both used internationally to integrate stormwater management into growth in the form of water sensitive urban design, also known internationally as low-impact design and Sustainable Urban Design solutions. Urban stormwater data from 77 Australian studies has been integrated in this report, from geographical regions of east coast Australia's eastern coast. Based on the findings of this review, generic load reduction goals that are common in new Australian planning legislation may be suboptimal in terms of attaining water quality targets, particularly because contaminants are present in low amounts.

Source link: https://doi.org/10.3389/fenvc.2022.853764


Review on inorganic pollutants in stormwater runoff of non-metal roofs

Stormwater runoff contamination has always been a target for metal roofs. However, with stormwater runoff, other roofing materials are also suspected of emitting metals and other inorganic substances. Hence, this paper focuses on the effects of commonly used non-metal roofs, both vegetated and non-vegetated, on stormwater runoff quality. 42 studies were collected and reviewed in order to get a general idea of chemicals in runoff from nine roofing types with a special focus on green roofs. For some roofing materials, Threshold values for groundwater security are exceeded especially for PO43, Cu, Pb, and Zn. Gravel roofs can act as a sink for NH4+ and can also contain some heavy metals. Elevated heavy metal concentrations were discovered in runoff from wood shingle roofs treated with preservative chemicals and in runoff from most roofing types, largely due to the used gutter materials.

Source link: https://doi.org/10.3389/fenvc.2022.884021


Improper Maintenance Activities Alter Benefits of Urban Stormwater Treatment in a Temperate Constructed Wetland in NSW, Australia

Constructed wetlands are a cost-effective way to prevent nutrient and sediment pollution in urban stormwater runoff and minimize the effect on receiving waterways. Following a long-term sampling program under baseflow and event flow conditions, the nutrient and sediment removal effectiveness of a CW was investigated in this research. A comprehensive investigation into nutrient removal rates was conducted using the analysis of dissolved and particulate nutrient fractions. Inflow and outflow pollutant concentrations were used to determine removal capability and pollutant loads under event flow conditions under baseflow conditions. Total N was no longer being treated under event flow conditions, but total P and total suspended sediment were retained, but total P and total suspended sediment were retained.

Source link: https://doi.org/10.3389/fenvc.2022.834191


Neighborhood change and the role of environmental stewardship: a case study of green infrastructure for stormwater in the City of Portland, Oregon, USA

With the recognition that humans are integral to the global ecosystem and that human activities both cause and impact ecological change, comes along with understanding of the importance of nature in cities and the building of cities. The interactions between humans and their environment within a urban context can have major implications for urban growth and change, but there is no comprehensive knowledge of the effects of these changes on residents' quality of life. I used empirical findings from a pre-post survey of eight urban neighborhoods to give feedback and interactions between a localized biophysical change in the form of a large-scale decentralized stormwater initiative, as well as the resulting changes in resident's perceptions of a rapid change.

Source link: https://doi.org/10.5751/ES-07736-200316


Ramifications due to urbanization and climate change on stormwater runoff and conduit efficiency: an integrated water management approach

Urbanization and climate change are on the rise in the frequency of urban floods throughout the world, which in turn places a significant obstacle to the urban stormwater drainage system's implementation. In two census wards Triplicane and Valasarakkam in Chennai City, this research investigated the effect of climate change and surface imperviousness in the urban stormwater runoff and the effect of washed off pollutants load in the conduit efficiency of two census wards Triplicane and Valasarakkam. The climate change information for the study area wards was obtained from the Regional climate model of Representative Concentration Pathway 4. 5. Using a questionnaire survey, the results of the present year scenario were confirmed, with quality and quantity estimations being developed, and the results of the current year scenario being validated. This paper presents the findings and recommendations for improving the conduit efficiency of an Integrated Water Management Approach.

Source link: https://doi.org/10.2166/wcc.2022.254


A Dual Media Filter using Zeolite and Mortar for the Efficient Removal of Heavy Metals in Stormwater Runoff

However, heavy metal removal in most modern runoff treatment plants, which uses infiltration and filtration, is limited and poses significant risks. In 232 h experiments with a time fixed empty bed contact time of 1. 8 minutes, the removal of Cu 2+, Zn 2+, Fe 3+, and Ni 2+ in a mixture was increased as the mortar layer's thickness increased. With a short EBCT, these findings reveal that the dual media method is cost-effective and efficient in the removal of heavy metals from stormwater runoff by precipitation, filtration, and adsorption.

Source link: https://doi.org/10.3390/w14213567


Evaluation and sizing of proprietary sedimentation devices for decentralised stormwater treatment

Suspended solids removal is a significant success factor for custom stormwater treatment systems. Device results are well characterized by a single parameter estimation, with Hazen's low surface loading rates in both technology classes and P900e9clet at a higher SLR for hydrodynamic separators, according to a statistical analysis. Gravity separation plus advection in low SLR separation in all technology classes has improved results, according to this, although high SLR separation in low SLR is more apparent. However, when low removal efficiencies are required, hydrodynamic separators provide a 33% increase in treatment area. HEIGHTS: COMMENTS – a summary of the sedimentation results of various stormwater treatment methods based on evolutionary criteria. ; Sand removal techniques have no effect on removal rates at low surface loading rates; paraphrasedoutput:; Hydrodynamic separators that have high surface loading rates may have improved removal rates.

Source link: https://doi.org/10.2166/wst.2022.342

* Please keep in mind that all text is summarized by machine, we do not bear any responsibility, and you should always check original source before taking any actions

* Please keep in mind that all text is summarized by machine, we do not bear any responsibility, and you should always check original source before taking any actions