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Calculating Volume
Cube:

L x W x H x 7.48 

= Total Gallons

Cylinder:

3.14 x r2 x h x 7.48

= Total Gallons

Sphere:

4.19 x r3 x 7.48

= Total Gallons

All measurements are in feet

Conversions
1 US Gallon
   = 0.833 UUK gallons
   = 3.75 liters
   = 3785.4 ml/cc
   = 128 fl oz
   = 4 Quarts
   = 16 cups
   = 231 cubic in
   = 8.3453 lbs (H2O)
1 UK Gallon
   = 1.201 US gallons
   = 4.546 liters
   = 4536 ml/cc
   = 153.7 fl oz
   = 4.8 Quarts
   = 19.2 cups
   = 277.4 cubic in
   = 10.0 lbs (H2O)
1 Quart
   = 0.946 liters
   = 946.3 ml/cc
   = 32 fl oz
   = 4 cups
   = 2.09 lbs (H2O)
1 Liter
   = 0.264 US gallons
   = 0.220 UK gallons
   = 33.814 fl oz
   = 2.47 lbs (H2O)
1 Pint
   = 0.473 liters
   = 473.17 ml/cc ml/cc
   = 16 fl oz
   = 2 cup
1 Cup
   = 0.236 liters
   = 236.6 ml/cc
   = 8 fl oz
   = 0.5 pt
   = 5216 drops
1 Tablespoon
   = 14.79 ml/cc
   = 3 tsp
   = 0.5 fl oz
   = 326 drops
1 Pound
   = 16 ounces
   = 453.6 grams
   = 7000 grains
1 Ounce (weight)
   = 28.35 grams
1 Grams
   = 1 ml/cc liquid
   = 0.035 oz
1 Ounces (liquid)
   = 29.5735 ml/cc
   = 1/8 cup
   = 2 Tbsp
   = 6 tsp
   = 651 drops
1 Cu Foot
   = 7.48 gallon H2O

Formulas
Centigrade to FahrenheitF = (C * 9/5) + 32
Fahrenheit to CentigradeC = (F -32) * 5/9
PSI to Head feetHF= PSI * 2.307

Gravity flow rates for schedule 40 PVC
1.5 in 350gph
2.0 in 750gph
3.0 in 1500gph
4.0 in 3000gph
6.0 in 6000gph