## Estimated Use of Water in the United States in 1990 Conversion Factors

```                   Multiply            By              To Obtain
--------------------------------   -----------  ---------------------------------
Area
acre      43,560    square foot
4,047    square meter
0.001562    square mile
Flow
gallon per day (gal/d)       3.785    liter per day
million gallons per day (Mgal/d)       1.121    thousand acre-feet per year
0.001547    thousand cubic feet per second
0.6944    thousand gallons per minute
0.003785    million cubic meters per day
1.3815    million cubic meters per year
thousand acre-feet per year      0.8921    million gallons per day
0.001380    thousand cubic feet per second
0.6195    housand gallons per minute
0.003377    million cubic meters per day

Some water relations in inch-pounds units are listed below:
(Approximations)
1 gallon        =       8.34 pounds
1 million gallons        =       3.07 acre-feet
1 cubic foot        =       62.4 pounds
=       7.48 gallons
1 acre-foot (acre-ft)        =       325,851 gallons
=       43,560 cubic feet
1 inch of rain        =       17.4 million gallons per sqare mile
=       27,200 gallons per acre
=       100 tons per acre
```