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Conservation of Mass in Moving, Nondeforming Control Volume01:14

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Trapezoidal channels are widely used in irrigation systems due to their cost-effectiveness and efficiency in conveying water. Trapezoidal channels feature a flat bottom and sloping sides, making them stable and easier to construct compared to other shapes. The bottom width and side slope ratio are determined based on the required flow capacity and site conditions. The side slope is kept gentle for unlined channels to prevent soil erosion.Hydraulic parameters in channel design include the flow...
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Constructing a roadway embankment over uneven terrain requires precise leveling to ensure stability and proper drainage. Surveyors use a leveling instrument and staff to calculate ground elevations and determine the required fill material at each point along the embankment alignment.The process begins by positioning a leveling instrument near a benchmark with a known elevation. A backsight reading establishes the instrument height, which serves as a reference for subsequent measurements. A...
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The alignment of a road line using Geographic Information Systems (GIS) is a critical process in civil engineering, combining advanced technology with practical decision-making. This methodology begins with the collection of geospatial data, including information on land cover, geomorphology, drainage patterns, slope, and contour details. Such data is typically acquired through satellite imagery and GIS tools, offering a comprehensive understanding of the terrain.Once the data is gathered, it...
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Air Temperature Reductions at the Base of Tree Canopies.

Journal of sustainable water in the built environmentยท2021
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Updated: Jul 16, 2025

Vegetated Treatment Systems for Removing Contaminants Associated with Surface Water Toxicity in Agriculture and Urban Runoff
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Developing Multiple Lines of Evidence to Decrease Drainage-to-Surface Area Ratio for Effective Stormwater Control

Thomas P O'Connor1

  • 1Environmental Engineer, United States Environmental Protection Agency, Stormwater Management Branch, 2890 Woodbridge Ave. (MS-104), Edison, NJ 08817.

Journal of Sustainable Water in the Built Environment
|September 13, 2023
PubMed
Summary
This summary is machine-generated.

Smaller bioretention units promote healthier vegetation growth and better stormwater infiltration. Undersized controls are suitable for municipalities aiming for greener rights-of-way and improved environmental quality.

Keywords:
BioretentionConstruction material costDesignGreen infrastructure (GI)Stormwater

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Area of Science:

  • Environmental Engineering
  • Urban Hydrology
  • Horticultural Science

Background:

  • Bioretention units are crucial for managing stormwater runoff.
  • Sizing bioretention stormwater controls involves balancing multiple design objectives.
  • Previous research has not fully elucidated the impact of unit size on vegetation health and performance.

Purpose of the Study:

  • To evaluate the drainage-to-surface runoff ratio for sizing bioretention stormwater controls.
  • To assess the impact of bioretention unit size and aspect ratio on vegetation growth and soil conditions.
  • To determine optimal sizing for bioretention areas prioritizing vegetation health and stormwater infiltration.

Main Methods:

  • Constructed and instrumented hydraulically isolated bioretention units of varying sizes and aspect ratios.
  • Monitored soil moisture content using water content reflectometers (WCRs) and thermistors.
  • Conducted vegetation surveys and analyzed planting media for organic matter and phosphorus content.

Main Results:

  • Smaller bioretention units (higher watershed-to-surface area ratios) exhibited superior shrub growth due to more frequent root zone saturation.
  • Plants in larger units, especially away from the inlet, often relied solely on direct rainfall, indicating underutilization of the stormwater control volume.
  • Smaller units showed greater buildup of organic matter and phosphorus, suggesting enhanced pollutant retention.

Conclusions:

  • Undersized bioretention controls can be effective for promoting healthy vegetation and achieving stormwater infiltration.
  • Municipalities can utilize smaller rights-of-way for bioretention, contributing to stormwater management and other environmental benefits.
  • Distributed bioretention systems, capturing frequent rainfall events, should be integrated into municipal stormwater management plans.