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/**
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@page Units Measurement Units
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The toolkit can use data expressed in either US Customary of SI Metric units. A project's unit system depends on the unit system used for its choice of flow units. If the @ref EN_open function is used to supply data to a project from an Input File then its flow units are set in the @ref OptionsPage section of the file. If the @ref EN_init function is used to initialize a project then the choice of flow units is the fourth argument to the function. The following table lists the units used to express the various parameters in an EPANET model.
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| Parameter | US Customary | SI Metric |
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|----------------|-------------------------|---------------------------|
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|Concentration | mg/L or ug/L | mg/L or ug/L |
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|Demand | (see Flow units) | (see Flow units) |
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|Diameter (Pipes)| inches | millimeters |
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|Diameter (Tanks)| feet | meters |
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|Efficiency | percent | percent |
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|Elevation | feet | meters |
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|Emitter Coeff. | flow units @ 1 psi drop | flow units @ 1 meter drop |
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|Energy | kwatt - hours | kwatt - hours |
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|Flow | CFS (cubic feet / sec) | LPS (liters / sec) |
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| | GPM (gallons / min) | LPM (liters / min) |
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| | MGD (million gal / day) | MLD (megaliters / day) |
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| | IMGD (Imperial MGD) | CMH (cubic meters / hr) |
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| | AFD (acre-feet / day) | CMD (cubic meters / day) |
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|Friction Factor | unitless | unitless |
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|Head | feet | meters |
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|Length | feet | meters |
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|Minor Loss Coeff. | unitless | unitless |
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|Power | horsepower | kwatts |
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|Pressure | psi | meters |
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|Reaction Coeff. (Bulk) | 1/day (1st-order)| 1/day (1st-order) |
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|Reaction Coeff. (Wall) | mass/sq-ft/day (0-order) | mass/sq-m/day (0-order) |
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| | ft/day (1st-order) | meters/day (1st-order) |
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|Roughness Coeff. | millifeet (Darcy-Weisbach) unitless otherwise| mm (Darcy-Weisbach) unitless otherwise |
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|Source Mass Injection | mass/minute | mass/minute |
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|Velocity | ft/sec | meters/sec |
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|Volume | cubic feet | cubic meters |
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|Water Age | hours | hours |
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*/
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