Changes

Settling velocity is influenced by particle size, shape, specific gravity, and water temperature. Coarser particles settle faster, whereas fine silts and organic matter take longer. Temperature affects viscosity, meaning lower temperatures reduce settling efficiency. Understanding particle size distributions at a site is critical for designing effective sedimentation systems.

Settling velocity is influenced by particle size, shape, specific gravity, and water temperature. Coarser particles settle faster, whereas fine silts and organic matter take longer. Temperature affects viscosity, meaning lower temperatures reduce settling efficiency. Understanding particle size distributions at a site is critical for designing effective sedimentation systems.

Research has shown wide variations in particle sizes in urban runoff, influenced by factors such as native soil texture, tree canopy cover, traffic levels, and road maintenance practices. While laboratory analyses help determine particle size, field studies provide more practical insights into sedimentation system performance. The studies cited in the table below show a range of values found in literature.

Research has shown wide variations in particle sizes in urban runoff, influenced by factors such as native soil texture, tree canopy cover, traffic levels, and road maintenance practices. While laboratory analyses help determine particle size, field studies provide more practical insights into sedimentation system performance. The studies cited in the table below show a range of values found in literature. D10 is the diameter at which 10% of the particle size distribution falls below, D50 is the diameter at

which 50% of the particle size distribution falls below, and D90 is the diameter at which 90% of the particle size distribution falls below.

{| class="wikitable"  

{| class="wikitable"  

! Sampling<br />method

! Sampling<br />method

! Analytical<br />method

! Analytical<br />method

! d₁₀<br />/µm

! D₁₀<br />/µm

! d₅₀<br />/µm

! D₅₀<br />/µm

! d₉₀<br />/µm

! D₉₀<br />/µm

! Source

! Source

|-

|-