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Description: Stormwater runoff study helps determine sizing criteria of control measures
Stormwater runoff study helps determine sizing criteria of control measures
Research results from a 2 year project that monitored green infrastructure retrofit systems reveal significant runoff volume reduction in the field compared to modeled performance expectations. Authors from the Department of Civil and Environmental Engineering at the University of New Hampshire's Stormwater Center explain how the study was carried out as well as its implications for determining the size of stormwater control measures.
Author(s)
James Houle
SourceArticle from World Water: Stormwater Management Magazine Spring Issue
Project IDSWM70
SubjectSpring issue
Document typeMagazine article
PublisherWater Environment Federation
Print publication date Feb 2018
Volume / Issue6 / 1
Content sourceWorld Water: Stormwater Management
First / last page(s)20 - 21
Copyright2018
Word count1,615
Subject keywordsStormwater Runoff
Associated keywords:green infrastructure retrofitrunoff reductionstormwater control systemstree box filterbioretentionmonitoring

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Description: Stormwater runoff study helps determine sizing criteria of control measures
Monitored treatment systems
Stormwater runoff study helps determine sizing criteria of control measures
The tree box filter installation is a proprietary pre-manufactured system located at the northeast corner of the West Edge parking lot at the University of New Hampshire in Durham, New Hampshire, US. The tree box sub-catchment area is 0.193 hectare (ha) of primarily asphalt pavement and is large enough to generate substantial runoff, which is gravity fed to the treatment. The tree box filter was...
PublisherWater Environment Federation
Copyright2018
Word count153
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Description: Stormwater runoff study helps determine sizing criteria of control measures
Instrumentation
Stormwater runoff study helps determine sizing criteria of control measures
Similar instruments were used to monitor the performance of both stormwater control systems. These included Water Content Reflectometers (WCRs), piezometers, pressure transducers, and other real-time measurements such as temperature. A rain gage was also installed and duplicate precipitation data was recorded at a nearby gage at the University of New Hampshire.
PublisherWater Environment Federation
Copyright2018
Word count52
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Description: Stormwater runoff study helps determine sizing criteria of control measures
Data synthesis
Stormwater runoff study helps determine sizing criteria of control measures
A range of measurements was tabulated from data collected, including total storm rainfall, total rainfall volume, total storm influent and effluent volume, storm peak flow (influent and effluent), volumetric water content (VWC), or a numerical measure of soil moisture, as measured by the WCR. Tabulated data was then used to calculate precipitation and hours of storm time centroid, storm lag,...
PublisherWater Environment Federation
Copyright2018
Word count100
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Description: Stormwater runoff study helps determine sizing criteria of control measures
Results and discussion
Stormwater runoff study helps determine sizing criteria of control measures
Tree box filter: Overall, the median volume reduction for all tree box events was 79 percent, and the average volume reduction was 64 percent. The cumulative volume reduction was 77 percent.
PublisherWater Environment Federation
Copyright2018
Word count659
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Description: Stormwater runoff study helps determine sizing criteria of control measures
Conclusions
Stormwater runoff study helps determine sizing criteria of control measures
Runoff volume reductions are significant and exceed anticipated levels even in areas with low permeability soils. This outcome is remarkable for a tree box filter, given that it is not normally designed for infiltration/volume reduction. The volume reduction results for all tree box events (n=145) was 79 percent and 64 percent for median and average influent volumes, which is remarkable since the...
PublisherWater Environment Federation
Copyright2018
Word count304
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Description: Stormwater runoff study helps determine sizing criteria of control measures
Authors’ Note
Stormwater runoff study helps determine sizing criteria of control measures
Research Assistant Professor James Houle, Associate Professor of Civil Engineering Thomas Ballestero, and Research Engineer Timothy Puls at the Department of Civil and Environmental Engineering, University of New Hampshire in Durham, also work at the University of New Hampshire Stormwater Center. This article is based on a presentation given at...
PublisherWater Environment Federation
Copyright2018
Word count135
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Stormwater runoff study helps determine sizing criteria of control measures