Dispersed Urban-Stormwater Control Improved Stream Water Quality in a Catchment-Scale Experiment

Published: Jan. 24, 2022

Traditional urban drainage degrades receiving waters. Alternative approaches have potential to protect downstream waters, but widespread adoption requires robust demonstration of their feasibility and effectiveness. We conducted a catchment-scale experiment over 19 years assess the effect dispersed stormwater control measures (SCMs), measured as reduction in effective imperviousness (EI) on stream water quality 6 sites 2 streams. compared changes those 7 EI decreased, 12 preceding years, 3 reference SCMs reduced phosphorus concentrations summer temperature levels dry weather where was sufficiently reduced, effects were smaller with increased antecedent rain. also nitrogen which influenced by septic tank seepage all sites. had no suspended solids concentrations, lower than electrical conductivity: along this is evidence contribution groundwater baseflows. This strengthens inference that increases contaminant streams, demonstrates such impacts are reversible likely preventable. Variation degree improvement among experimental suggests achieving would require large retention capacity intercepting runoff from nearly impervious surfaces, thus requiring more downslope space demand. useful metric for predicting responses SCMs, allowing better catchment prioritization SCM design standards protection.

Language: Английский

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Uso do solo e regimes de precipitação como determinantes para a qualidade da água

Published: Dec. 6, 2023

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Effects of Slope Green Infrastructure on Water Quantity-Quality Processes at the Watershed Scale: A Review

Research Square (Research Square), Journal Year: 2022, Volume and Issue: unknown

Published: Aug. 3, 2022

Abstract Vegetation protection and restoration, protective forest grass construction, as the typical Slope Green Infrastructures (SGI), significantly effect water hydrological environmental process on slope. The change of production confluence impact river discharge, which could determine condition waters. This review investigated relevant literature over past 20 years via bibliometric tool, analyzed hotspots SGI quantity-quality (WQQ). Findings confirm that urban, runoff, land use, stormwater, climate had been paid attention. Then potential response cycle to construction were explored, including precipitation, evaporation, dissolved oxygen, nitrate, etc. WQQ joint simulation methods also listed. At last, we proposed development trend future research WQQ. word this paper provide technique support for problem treatment natural resource management at watershed scale.

Language: Английский

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Dispersed urban-stormwater control improved stream water quality in a catchment-scale experiment

Published: Dec. 16, 2021

Traditional approaches to urban drainage degrade receiving waters. Alternative have potential protect downstream waters and provide other benefits cities, including greater water security. Their widespread adoption requires robust demonstration of their feasibility effectiveness. We conducted a catchment-scale, before-after-control-reference-impact experiment assess the effect dispersed stormwater control on stream ecosystems. used variant effective imperviousness (EI), integrating catchment-scale runoff impact stormwater-control-measure (SCM) performance, as measure experimental effect. assessed response quality variables in 6 sites 2 streams, following SCM implementation catchments. compared changes those streams over 7 years, increased, 12 preceding 19 years 3 reference streams. SCMs reduced phosphorus nitrogen concentrations temperature, increased electrical conductivity; with size negatively correlated antecedent rain. SCM-induced reductions temperature were similar magnitude increases from development, when function change EI. Nitrogen observed, even though among not EI, being more influenced by septic tank seepage. had no suspended solids concentrations, which lower than This strengthens inference that contaminant demonstrates such impacts are reversible likely preventable. reduce reducing frequency uncontrolled flows augmenting baseflows. Increased EC result contribution groundwater The achieved did fully return or levels, but responses indicate an outcome is possible dominant conditions (up ~20 mm 24-h rain). would require nearly all impervious surfaces draining large retention capacity, thus requiring downslope space demand. EI predicts SCMs, allowing better catchment prioritization design standards for protection.

Language: Английский

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Influência do gradiente de intensidade de uso do solo sobre a integridade ecológica de riachos neotropicais

Published: Dec. 13, 2021

Influence of land use intensity gradient on the ecological integrity neotropical streamsHeadwater streams have a strong connection with terrestrial environment, so degree conservation riparian vegetation and in their area contribution exert direct indirect effects streams.Direct impacts include changes hydrological processes, channel morphology, size quantity wood supplied, canopy cover water parameters; while are related to aquatic community.The dependence relationship between ecosystems influences quality physical habitat, as consequence, promotes community processes.Thus, we intend answer following questions this study: (i) is there catchment chemical characteristics headwater streams?(ii) how does affect macroinvertebrate structure?The study was carried out 18 region São Miguel Arcanjo (SP), representing intensity: conserved native vegetation; Eucalyptus spp plantations 4 7 years old; young aged up 3 agriculture high presence low coverage.The parameters obtained situ analyzed laboratory were: dissolved oxygen concentration, temperature, electrical conductivity, pH, nutrients, ions, organic carbon, inorganic carbon total suspended solids.To characterize habitat (e.g.channel substrate, volume etc) streams, protocol developed by North American Environmental Protection Agency (US-EPA) applied.To evaluate community, macroinvertebrates were collected 10 sub-sections stream surber, an extension 100 150 m.Overall, results showed that regions not gradual continuous across all variable categories (channel hydraulics, pieces wood, vegetation, influence human resources quality).Streams forest areas best conditions, is, allowed greater heterogeneity different micro-habitats essential for survival biota.On other hand, abundance Chironomidae group increased towards more intensive uses.This work confirms less uses impact community.Thus, most must apply good soil management practices, among measures, will reflect protection streams.

Language: Английский

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