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SPAS 2009 uses SI or Imperial units, as shown in the following table:
SI unit system
Variable
|
Units
|
Symbol
|
Time
|
millisecond
|
ms
|
Depth
|
metres
|
m
|
Unit weight
|
kilonewtons per cubic metre
|
kN/m³
|
Acceleration of gravity
|
metres per square seconds
|
m/s²
|
Velocity
|
metres per second
|
m/s
|
Shear modulus
|
megapascals
|
MPa
|
Imperial unit system
Variable
|
Units
|
Symbol
|
Time
|
millisecond
|
ms
|
Depth
|
Feet
|
ft
|
Unit weight
|
pounds per cubic foot
|
pcf
|
Acceleration of gravity
|
feet per square seconds
|
ft/s²
|
Velocity
|
feet per second
|
ft/s
|
Shear modulus
|
tons per square foot
|
tsf
|
|