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