Seasonal size distributions of suspended solids in a stormwater management pond

1999 ◽  
Vol 39 (2) ◽  
Keyword(s):  
Stormwater Management ◽  
Suspended Solids ◽  
Size Distributions

Seasonal size distributions of suspended solids in a stormwater management pond

1999 ◽  
Vol 39 (2) ◽  
pp. 127-134 ◽  
Author(s):  
B. G. Krishnappan ◽  
J. Marsalek ◽  
W. E. Watt ◽  
B. C. Anderson
Keyword(s):  
Particle Size ◽  
Water Samples ◽  
Stormwater Management ◽  
Suspended Solids ◽  
Size Range ◽  
Empirical Relationship ◽  
Size Distributions ◽  
Fall Velocity ◽  
Floc Size ◽  
Primary Particles

Three seasonal surveys of suspended solids were carried out in an on-stream stormwater management pond, by means of a submersible laser particle size analyser. Size distributions were measured at up to 17 points in the pond, and water samples collected at the same locations were analysed for primary particles aggregated in flocs. Observed suspended solids were mostly composed of flocs, with maximum sizes ranging from 30 to 212 μm for winter and summer surveys, respectively. Using a relationship defining the floc density as a function of floc size and Stokes' equation for settling, an empirical relationship expressing the floc fall velocity as a function of floc size was produced. This relationship indicates that naturally formed flocs in the size range from 5 to 15 μm would settle faster than both smaller primary particles of higher density, and somewhat larger flocs of lower density, which are however susceptible to break up by turbulence.

scholarly journals Assessment on the Effectiveness of Urban Stormwater Management

2020 ◽  
Author(s):  
Yixin Zhang ◽  
Weihan Zhao ◽  
Xue Chen ◽  
Changhyun Jun ◽  
Jianli Hao ◽  
...  
Keyword(s):  
Green Infrastructure ◽  
Urban Areas ◽  
Stormwater Management ◽  
Suspended Solids ◽  
Low Impact Development ◽  
Stormwater Runoff ◽  
Reduction Rate ◽  
Urban Resilience ◽  
Sponge City ◽  
Global Issues

Stormwater management is a key urban issue in the world, in line with the global issues of urban sprawl and climate change. It is urgent to investigate the effectiveness in managing stormwater with different strategies for maintain urban resilience. A method based on a storm water management model (SWMM) was developed for assessing the control of stormwater runoff volume and the percentage removal of suspended solids by implementing a Sponge City strategy. An interdisciplinary approach was adopted incorporating Low Impact Development (LID) with urban Green Infrastructure and Gray Infrastructure paradigms in a typical old residential community in Suzhou, China. Four types of sponge facilities for reducing stormwater runoff were bio-retention cells, permeable pavements, grassed pitches, and stormwater gardens. The simulation results indicate that the stormwater pipe system can meet the management standard for storms with a five-year recurrence interval. The volume capture ratio of annual runoff is 91% and the reduction rate of suspended solids is 56%. This study demonstrates that Sponge City strategy is an effective approach for managing stormwater, particularly in old and densely populated urban areas. Implementing spongy facilities with a LID strategy for stormwater management can significantly enhance urban water resilience and increase ecosystem services.

scholarly journals Development of a bio-retention system for urban storm water management

2021 ◽  
Vol 889 (1) ◽  
pp. 012075
Author(s):  
Polimerra Venkata Koti Reddy ◽  
Pramod Kumar ◽  
Siby John
Keyword(s):  
Stormwater Management ◽  
Blast Furnace Slag ◽  
Suspended Solids ◽  
Total Suspended Solids ◽  
Ph Variation ◽  
Retention System ◽  
Water Courses ◽  
Flow Through ◽  
Furnace Slag ◽  
Urban Storm

Abstract Urban stormwater that flows through all the manmade structures contains high levels of BOD TSS, orthophosphate, surfactants etc. It raises concerns of water quality in the receiving natural water courses. Bio-retention is one of the prominent methods of stormwater management for the removal of contaminants from stormwater. In this esxperimental study, a column containing mulch, blast furnace slag, sand, silt etc. was used to assess the removal of suspended solids and nutrients (nitrate and phosphate) from stormwater. The tests were conducted with a flow through period of 3, 7 and 15 days. Removal efficiency of 80% total suspended solids for 15 day, 60% nitrate for 7 days and 70% phosphorous for 3 and 7 days was observed through the column. pH variation was found to be insignificant in the range of 6-7.5.

scholarly journals Assessment on the Effectiveness of Urban Stormwater Management

Water ◽  
2020 ◽  
Vol 13 (1) ◽  
pp. 4
Author(s):  
Yixin Zhang ◽  
Weihan Zhao ◽  
Xue Chen ◽  
Changhyun Jun ◽  
Jianli Hao ◽  
...  
Keyword(s):  
Green Infrastructure ◽  
Stormwater Management ◽  
Suspended Solids ◽  
Low Impact Development ◽  
Stormwater Runoff ◽  
Reduction Rate ◽  
Interdisciplinary Approach ◽  
Residential Areas ◽  
Urban Resilience ◽  
Pipe System

Stormwater management is a key issue in line with global problems of urbanization and climate change. Assessing the effectiveness in managing stormwater is crucial to maintain urban resilience to flooding risk. A method based on a stormwater management model (SWMM) was developed for assessing the control of stormwater runoff volume and the percentage removal of suspended solids by implementing a Sponge City strategy. An interdisciplinary approach was adopted incorporating Low Impact Development (LID) with urban green infrastructure and grey infrastructure paradigms in a typical old residential community in Suzhou, China. Sponge facilities for reducing stormwater runoff included bio-retention cells, permeable pavements, grassed pitches, and stormwater gardens. The simulation results of SWMM show that the stormwater pipe system can meet the management standard for storms with a five-year recurrence interval. The volume capture ratio of annual runoff was 91%, which is higher than control target of 80%. The suspended solids reduction rate was 56%, which meets the requirement of planning indicators. Thus, the proposed method of spongy facilities can be used for renovation planning in old residential areas in China. Implementing spongy facilities with a LID strategy for stormwater management can significantly enhance urban water resilience and improve ecosystem services.

Operational Monitoring of Urban Stormwater Management Facilities and Receiving Subwatersheds in Richmond Hill, Ontario

2004 ◽  
Vol 39 (4) ◽  
pp. 392-405 ◽  
Author(s):  
Daniel D. Olding ◽  
Tracey S. Steele ◽  
John C. Nemeth
Keyword(s):  
Best Management Practices ◽  
Stormwater Management ◽  
Suspended Solids ◽  
Management Practices ◽  
Storm Event ◽  
Limited Information ◽  
Construction Sites ◽  
Operational Monitoring ◽  
Best Management ◽  
Urban Impacts

Abstract Untreated stormwater discharge has been found to have major impacts on urban watercourses. Despite the acknowledgement of the importance of adopting broader-scale approaches to managing stormwater, there is limited information describing the subwatershed benefits of implementing numerous best management practices (BMPs). Operational monitoring of stormwater management facilities (SWMFs) and streams in three subwatersheds undergoing urbanization was undertaken over a five-year period to measure potential changes in suspended solids concentrations, hydrology and temperature. SWMFs at construction sites had elevated total suspended solids (TSS) discharges relative to facilities in stable catchments, but reduced TSS discharges in comparison to uncontrolled construction sites. The discharge from single facilities was found to have the potential to increase downstream watercourse TSS concentrations in headwater areas, but increases were often not detectable further downstream. TSS discharges from SWMFs in stable catchments were similar to published ranges, and were a useful tool to identify facilities that were not functioning as designed. Based upon the current subwatershed imperviousness levels, water quality impacts from cumulative SWMF discharges appear to be less likely to be significant than some other factors, such as the changes in the subwatershed hydrological response. No increase in peakflow or duration of midbankfull flow for the 25-mm and 2-year storm event and no trend in baseflow or water temperature were detectable over the study period, despite the increase in imperviousness due to watershed urbanization. The findings from this operational monitoring study suggest that implementation of BMPs may help to mitigate urban impacts at the subwatershed level.

Continuous simulations of urban stormwater runoff and total suspended solids loads: influence of varying climatic inputs and catchment imperviousness

2014 ◽  
Vol 5 (4) ◽  
pp. 593-609 ◽  
Author(s):  
Matthias Borris ◽  
Anna-Maria Gustafsson ◽  
Jiri Marsalek ◽  
Maria Viklander
Keyword(s):  
Climate Change ◽  
Stormwater Management ◽  
Suspended Solids ◽  
Total Suspended Solids ◽  
Cold Climate ◽  
Climate Change Scenarios ◽  
Road Maintenance ◽  
Urban Catchments ◽  
Urban Stormwater Runoff ◽  
Rainfall Regimes

Potential implications of climate change for future stormwater management were addressed by undertaking continuous simulations of runoff and total suspended solids (TSS) loads for three urban catchments, with imperviousness varying from 23 to 63%, which were exposed to five rainfall regimes during the snow-free part of the year: the current climate and four climate change scenarios projecting higher rainfalls. Simulated runoff volumes increased in all the future scenarios, particularly in the sub-arctic climate and the fixed uplift scenario (plus20) indicating appreciable rainfall increases. Simulated runoff volumes increased depending on the projected increases in rainfall and increasing runoff contributions from pervious areas when more intense future rainfalls exceeded hydrologic abstractions. The increased runoff volumes then contributed higher TSS loads, which were highly variable for the rainfall regimes tested. In cold climate regions, residues of solids from winter road maintenance may contribute to high initial accumulations of TSS on the catchment surface and high washed off loads. In general, the study suggests that intermediate design-life stormwater management facilities require flexible design allowing for future step-wise adaptation by gradually increasing design capacities and modifying treatment trains.

scholarly journals Water Quality Improvement and Pollutant Removal by Two Regional Detention Facilities with Constructed Wetlands in South Texas

2020 ◽  
Vol 12 (7) ◽  
pp. 2844 ◽  
Author(s):  
Javier Guerrero ◽  
Ahmed Mahmoud ◽  
Taufiqul Alam ◽  
Muhammed A. Chowdhury ◽  
Adeniyi Adetayo ◽  
...  
Keyword(s):  
Water Quality ◽  
Stormwater Management ◽  
Suspended Solids ◽  
Pollutant Removal ◽  
South Texas ◽  
Management Systems ◽  
Load Reduction ◽  
Storm Events ◽  
Nitrogen And Phosphorus ◽  
Detention Facilities

Stormwater runoff introduces several pollutants to the receiving water bodies that may cause degradation of the water quality. Stormwater management systems such as detention facilities and wetland can improve the water quality by removing various pollutants associated with the runoff. The objective of this research project is to determine the performance and efficiency of two major regional detention facilities (RDFs) with different designs and structures in reducing pollutants based on various storm events in McAllen, Texas. The two sites are the McAuliffe RDF and the Morris RDF; each site was incorporated with a constructed wetland with a different design and structure to enhance the pollutant removal process. The McAuliffe RDF reduced the concentration and load of many stormwater constituents in comparison to the Morris RDF. The observed concentrations and pollutant loads of suspended solids were much lower in the runoff of the inlet compared to the outlet for both sites. The McAuliffe RDF showed better concentration and load reduction for nutrients, such as nitrogen and phosphorus, of different species. However, both sites did not show a significant improvement of organic material. In addition, the indicator bacteria concentration represented a fluctuation between the inlet and outlet at each site.

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