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===Four Step Process===
Soil infiltration testing is a four-step process to obtain the necessary information for stormwater management planning and design. The four steps include:
Soil infiltration testing is a four-step process to obtain the necessary information for stormwater management planning and design. The four steps include:
The infiltration rate used to design an infiltration BMP must incorporate a safety correction factor that compensates for potential reductions in soil permeability due to compaction or smearing during construction, gradual accumulation of fine sediments over the lifespan of the BMP and uncertainty in measured values when less permeable soil horizons exist within 1.5 metres below the proposed bottom elevation of the BMP.
The infiltration rate used to design an infiltration BMP must incorporate a safety correction factor that compensates for potential reductions in soil permeability due to compaction or smearing during construction, gradual accumulation of fine sediments over the lifespan of the BMP and uncertainty in measured values when less permeable soil horizons exist within 1.5 metres below the proposed bottom elevation of the BMP.
{|class="wikitable"
|+ Safety correction factors for calculating design infiltration rates
|-
!style="background: darkcyan; color: white"|Ratio of Mean Measured Infiltration Rates
!style="background: darkcyan; color: white"|Safety Correction Factor
|-
|≤ 1
|2.5
|-
|1.1 to 4.0
|3.5
|-
|4.1 to 8.0
|4.5
|-
|8.1 to 16.0
|6.5
|-
|16.1 or greater
|8.5
|}
[[category:Infiltration]]
[[category:Infiltration]]