Essential Constants for Water Operators
| Conversion Unit | Exact Equivalent | Exam Rule of Thumb |
|---|---|---|
| 1 MGD | 694.44 GPM | Multiply by 1,000,000 ÷ 1440 min/day |
| 1 CFS | 448.8 GPM (or 0.646 MGD) | 1 cu ft/sec = 448.8 gal/min |
| 1 Cubic Foot (ft³) | 7.48 Gallons | 62.4 lbs of water |
| 1 Gallon of Water | 8.34 Pounds | Standard water density at 39.2°F |
| 1 PSI | 2.31 Feet of Head | Height of column = PSI × 2.31 |
| 1 Foot of Head | 0.433 PSI | Pressure = Feet × 0.433 |