Units of Measurement

Elad Salomons edited this page Sep 25, 2015 · 3 revisions

NOTE: US Customary units apply when CFS, GPM, MGD, IMGD, or AFD are chosen as flow units. SI Metric units apply when flow units are expressed using either liters or cubic meters. See [OPTIONS] for how to select flow units.

Parameter US Customary SI Metric
Concentration mg/L or ug/L mg/L or ug/L
Demand (see Flow units) (see Flow units)
Diameter (Pipes) inches millimeters
Diameter (Tanks) feet meters
Efficiency percent percent
Elevation feet meters
Emitter Coeff. flow units @ 1 psi drop flow units @ 1 meter drop
Energy kwatt - hours kwatt - hours
Flow CFS (cubic feet / sec) GPM (gallons / min)
MGD (million gal / day) IMGD (Imperial MGD)
AFD (acre-feet / day) LPS (liters / sec)
LPM (liters / min) MLD (megaliters / day)
CMH (cubic meters / hr) CMD (cubic meters / day)
Friction Factor unitless unitless
Head feet meters
Length feet meters
Minor Loss Coeff. unitless unitless
Power horsepower kwatts
Pressure psi meters
Reaction Coeff. (Bulk) 1/day (1st-order) 1/day (1st-order)
Reaction Coeff. (Wall) mass/sq-ft/day (0-order) mass/sq-m/day (0-order)
ft/day (1st-order) meters/day (1st-order)
Roughness Coeff. millifeet (Darcy-Weisbach) mm (Darcy-Weisbach)
unitless otherwise unitless otherwise
Source Mass Injection mass/minute mass/minute
Velocity ft/sec meters/sec
Volume cubic feet cubic meters
Water Age hours hours
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