Measurement Units

SI Metric Units

Measurement

 

Unit

Area (Subcatchment)

Hectares

Area (Storage Unit)

Square metres

Area (Ponding)

Square meters

Capillary Suction

Millimetres

Concentration

mg/L

 ug/L

Counts/L

Decay Constant (Infiltration)

1/hours

Decay Constant (Pollutants)

1/days

Depression Storage

Millimetres

Depth

Metres

Diameter

Metres

Discharge Coefficient - Orifice

Dimensionless

Discharge Coefficient - Weir

CMS/metre

Elevation

Metres

Evaporation

mm/day

Flow

CMS

 LPS

 MLD

Head

Metres

Hydraulic Conductivity

mm/hour

Infiltration Rate

mm/hour

Length

Metres

Manning's n

sec/metre

Pollutant Buildup

mass/ha

 mass/length

Rainfall Intensity

mm/hour

Rainfall Volume

Millimetres

Slope (Subcatchments)

Percent

Slope (Cross Section)

Rise/Run

Street Cleaning Interval

Days

Volume

Cubic Metres

Width

Metres

US Standard Units

Measurement

 

Unit

Area (Subcatchment)

Acres

Area (Storage Unit)

Square Feet

Area (Ponding)

Square Feet

Capillary Suction

Inches

Concentration

mg/L

 ug/L

 Counts/L

Decay Constant (Infiltration)

1/hours

Decay Constant (Pollutants)

1/days

Depression Storage

Inches

Depth

Feet

Diameter

Feet

Discharge Coefficient - Orifice

Dimensionless

Discharge Coefficient - Weir

CFS/ft

Elevation

Feet

Evaporation

Inches/Day

Flow

CFS

 GPM

 MGD

Head

Feet

Hydraulic Conductivity

Inches/Hour

Infiltration Rate

Inches/Hour

Length

Feet

Manning's n

Sec/Metre

Pollutant Buildup

Mass/Acre

 Mass/Length

Rainfall Intensity

Inches/Hour

Rainfall Volume

Inches

Slope (Subcatchments)

Percent

Slope (Cross Section)

Rise/Run

Street Cleaning Interval

Days

Volume

Cubic Feet

Width

Feet