Units

Gusnet uses the same sets of units as Epanet, including both SI-based units and US customary units. The below table, Table 1, shows the units that will be used.

Table 1 EPANET INP File Unit Conventions

Parameter	US customary units	SI-based units
Concentration	mass /L where mass can be defined as mg or ug	mass /L where mass can be defined as mg or ug
Demand	Same as flow	Same as flow
Diameter (Pipes)	in	mm
Diameter (Tanks)	ft	m
Efficiency (Pumps)	percent	percent
Elevation	ft	m
Emitter coefficient	flow / sqrt(psi)	flow / sqrt(m)
Energy	kW-hours	kW-hours
Flow	CFS: ft 3 /s GPM: gal/min MGD: million gal/day IMGD: million imperial gal/day AFD: acre-feet/day	LPS: L/s LPM: L/min MLD: million L/day CMH: m 3 /hr CMD: m 3 /day
Friction factor	unitless	unitless
Hydraulic head	ft	m
Length	ft	m
Minor loss coefficient	unitless	unitless
Power	horsepower	kW
Pressure	psi	m
Reaction coefficient (Bulk)	1/day (1st-order)	1/day (1st-order)
Reaction coefficient (Wall)	mass /ft/day (0-order) ft/day (1st-order)	mass /m/day (0-order) m/day (1st-order)
Roughness coefficient	0.001 ft (Darcy-Weisbach) unitless (otherwise)	mm (Darcy-Weisbach) unitless (otherwise)
Source mass injection rate	mass /min	mass /min
Velocity	ft/s	m/s
Volume	ft 3	m 3
Water age	hours	hours