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OWA-EPANET Toolkit
2.2
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OWA-EPANET Toolkit
2.2
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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 EN_open function is used to supply data to a project from an Input File then its flow units are set in the [OPTIONS] section of the file. If the 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.
| 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) | LPS (liters / sec) |
| GPM (gallons / min) | LPM (liters / min) | |
| MGD (million gal / day) | MLD (megaliters / day) | |
| IMGD (Imperial MGD) | CMH (cubic meters / hr) | |
| AFD (acre-feet / day) | 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) unitless otherwise | mm (Darcy-Weisbach) unitless otherwise |
| Source Mass Injection | mass/minute | mass/minute |
| Velocity | ft/sec | meters/sec |
| Volume | cubic feet | cubic meters |
| Water Age | hours | hours |