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!colspan = "2" style="background: darkcyan; color: white; align = center"|Surface
!colspan = "2" style="background: darkcyan; color: white; align = center"|Surface
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|width = 210px|Berm height (mm)||This is the height of the curb which constrains the overland sheet flow of water. Where curb cuts or other outlet exists at the lowest point of the pavement, the suggested value is 0.
|width = 210px|[[Berm]] height (mm)||This is the height of the curb which constrains the overland sheet flow of water. Where [[curb cuts]] or other outlet exists at the lowest point of the pavement, the suggested value is 0.
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|Surface roughness (Manning’s n)||Lower numbers indicate less surface obstruction and result in faster flow.
|Surface roughness (Manning’s n)||Lower numbers indicate less surface obstruction and result in faster flow.
Suggested range for pavement 0.01 – 0.02 <ref name = SWMM> Oregon State Univ., Corvallis. Dept. of Civil, Construction and Environmental Engineering.; Environmental Protection Agency, Cincinnati ONRMRL. Storm Water Management Model Reference Manual Volume I Hydrology (Revised). 2016:233. https://nepis.epa.gov/Exe/ZyPURL.cgi?Dockey=P100NYRA.txt Accessed August 23, 2017.</ref>
Suggested range for pavement 0.01 – 0.02 <ref name = SWMM> Oregon State Univ., Corvallis. Dept. of Civil, Construction and Environmental Engineering.; Environmental Protection Agency, Cincinnati ONRMRL. Storm Water Management Model Reference Manual Volume I Hydrology (Revised). 2016:233. https://nepis.epa.gov/Exe/ZyPURL.cgi?Dockey=P100NYRA.txt Accessed August 23, 2017.</ref>
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|Surface slope (%)||Typically between 1 – 4% (>2% recommended [[Salt management|Effective grading]])
|Surface [[slope]] (%)||Typically between 1 – 4% (>2% recommended [[Salt management|Effective grading]])
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!colspan = "2" style="background: darkcyan; color: white; align = center"|Pavement
!colspan = "2" style="background: darkcyan; color: white; align = center"|Pavement
|Thickness (mm)||This is the thickness of just the pre-cast blocks (or depth of asphalt/concrete poured in place).
|Thickness (mm)||This is the thickness of just the pre-cast blocks (or depth of asphalt/concrete poured in place).
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|Void ratio||This most commonly refers to the jointing material used between precast blocks. Suggest range 0.35 – 0.4 unless otherwise tested. Where a pervious product is poured in place, an appropriate figure should be obtained from the manufacturer.
|Void ratio||This most commonly refers to the jointing material used between precast blocks. Suggest 0.35 unless otherwise tested. Where a pervious product is poured in place, an appropriate figure should be obtained from the manufacturer.
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|Impervious surface fraction||This is the proportion of the total pavement taken up with the pre-cast blocks and will vary between products; an example value may be 0.85.
|Impervious surface fraction||This is the proportion of the total pavement taken up with the pre-cast blocks and will vary between products; an example value may be 0.85.
|Permeability (mm/hr)||This is the permeability of the joint material in block systems. Where the permeability of the bulk surface is measured and known instead, the impervious fraction can be adjusted to model a block surface as continuously permeable instead.
|Permeability (mm/hr)||This is the permeability of the joint material in block systems. Where the permeability of the bulk surface is measured and known instead, the impervious fraction can be adjusted to model a block surface as continuously permeable instead.
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|[[Clogging]] factor||0.5 for matured system?
|[[Clogging]] factor||0.5 to model a matured system?
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!colspan = "2" style="background: darkcyan; color: white; align = center"|Soil (Bedding layer?)
!colspan = "2" style="background: darkcyan; color: white; align = center"|Soil (Bedding layer?)
|Seepage rate (mm/hr)||Infiltration rate of native soil
|Seepage rate (mm/hr)||Infiltration rate of native soil
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|Clogging factor||?
|Clogging factor||0.5 to model a matured system?
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|Design drawdown time (hrs)||See [[Drainage time]]
|Design drawdown time (hrs)||See [[Drainage time]]