Flow field and sediment removal in a stormwater sump utilizing internal structures

Area of Science:

• Environmental Engineering
• Fluid Dynamics
• Water Resource Management

Background:

• Stormwater sumps are crucial for sediment retention in urban runoff.
• Optimizing sump hydraulics is essential for effective particle removal.
• Existing methods for evaluating sump efficiency require refinement.

Purpose of the Study:

• To investigate the hydraulic characteristics of stormwater sumps.
• To optimize sump design for enhanced sediment retention using physical experiments.
• To develop a more accurate metric for evaluating sediment removal efficiency.

Main Methods:

• Physical experiments were conducted to simulate stormwater flow.
• Particle image velocimetry (PIV) was employed to analyze flow fields within the sumps.
• The impact of internal structures on solids retention was assessed.

Main Results:

• Internal structures significantly improved sediment removal efficiency for 125 μm suspended solids by 20-30%.
• A modified Péclet number was proposed for a more accurate assessment of sump performance.
• The study identified key design parameters for optimizing particle removal.

Conclusions:

• Internal structures are effective in enhancing the sediment removal capabilities of stormwater sumps.
• The proposed modified Péclet number offers a valuable tool for sump design and evaluation.
• Findings have implications for improving particle removal systems in various industrial and environmental contexts.