Page 334 - Hydrogeology Principles and Practice

HYDD01 12/5/05 5:31 PM Page 317

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Appendix
Conversion factors

Quantity Unit SI equivalent Quantity Unit SI equivalent
−1
Length 1 yard (yd) 0.914 m Velocity 1 ft s −1 3.048 × 10 ms −1
−1
1 foot (ft) 0.305 m 1kmh −1 2.778 × 10 ms −1
−1
1 inch (in) 25.4 mm 1 mile h −1 4.470 × 10 ms −1
1 mile 1.609 km
−1 −1
Viscosity 1 lb.ft s 1.488 N s m −2
Area 1 yd 2 0.836 m 2 1 Poise 0.1 N s m −2
−2
1ft 2 9.290 × 10 m 2 Viscosity (kinematic) 1 stoke 10 m s
−4
2 −1
2
1in 2 6.452 × 10 mm 2
1 mile 2 2.590 km 2 Energy 1 kWh 3.6 MJ
3
1 acre 4.407 × 10 m 2 1 Btu 1.055 kJ
4
1 hectare (ha) 1 × 10 m 2 1 Therm 105.506 MJ
1 kcal 4.187 kJ
−2
Volume 1 ft 3 2.832 × 10 m 3 1 foot poundal 4.214 × 10 J
−2
−3
1 UK gallon 4.546 × 10 m 3
−1
−3
1 US gallon 3.784 × 10 m 3 Power 1 horse power 7.457 × 10 kW
1 Btu ft −2 11.357 kJ m −2
−1
Mass 1 pound (lb) 4.536 × 10 kg 1 cal cm −2 41.868 kJ m −2
3
1 UK ton 1.0165 × 10 kg
3 −1
3 −1
−2
2
1 US ton 9.072 × 10 kg Discharge ft s 2.832 × 10 m s
−5
3 −1
1 tonne (t) 1000 kg US gallon min −1 6.309 × 10 m s
−2
Density 1 lb ft −3 16.0185 kg m −3 Intrinsic permeability ft 2 9.290 × 10 m 2
darcy 9.870 × 10 −13 m 2
Force and weight 1 poundal (pdl) 0.138 N
−1
1 poundal-force (lb ) 4.448 N Hydraulic conductivity ft s −1 3.048 × 10 ms −1
f
−1
−7
US gallon day ft −2 4.720 × 10 ms −1
−2
Pressure 1 lb in (psi) 6.895 kPa
f
−2
2 −1
2 −1
−2
1lb ft −2 4.788 × 10 kPa Transmissivity ft s 9.290 × 10 m s
f
2 −1
−7
−1
1 mm Hg 133.322 Pa US gallon day ft −1 1.438 × 10 m s
1ftH O 2.989 kPa
2
1mH O 9.807 kPa
2
1kgcm −2 98.067 kPa
1 bar 100 kPa
1 atmosphere 101.325 kPa