Page 5 - Fair, Geyer, and Okun's Water and wastewater engineering : water supply and wastewater removal

JWCL344_ifc.qxd 8/26/10 8:31 PM Page 3

0.7375 lb-ft kWh 10 4 2.778 kJ kilojoule 23.73 poundal-ft 44.25 ft-lb/min 1 J/s 1 watt W watt Power 1.341 hp kW kilowatt 3.412 Btu/h J/s joule per second 15,850 gpm 2,119 cfm or ft 3 /min 15.85 gpm Application of Units Customary Customary Equivalents* Comments Symbol Unit Description Equivalents* 0.06242 lb/ft 3 The density of water kg/m 3 kilogram per Density under standard cubic meter conditions is 1,000 or 1,000 g/L kg/m 3 or 1 g/mL. 1 ppm or mg/L mg/L milligram per Concentration liter (water) 0.06242 lb/ft 3 /d kg

The meter is mea- sured perpendicular to the line of action of the force N. Not a joule. Comments For meteorological purposes, it may be convenient to mea- sure precipitation in terms of mass/unit area (kg/m 2 ). 1 mm of rain 1 kg/m 2 86.4 m 3 /d 1 L/s

N.m m 3 /s L/s Application of Units Symbol mm m 3 /s L/s m 3 /d m 3 /year Lpcd *Miles are U.S. statute, qt and gal are U.S. liquid, and oz and lb are avoirdupois.

newton meter meter cubic per second liter per second Unit millimeter cubic meter per second liter per second meter cubic day per cubic meter per year liter per capita per day

Moment of torque Flow (volumetric) Description Percipitation, run-off, evaporation Flow Discharges or abstractions, yields Usage of water