Common Conversions for Water Resources

 

For Your Use:

The Following Excel File represents

a Collection of conversion formulas:    Conversion Chart


COMMON ABBREVIATIONS


AF = acre-feet per year
AF/YR = acre-feet per year
CFS = cubic feet per second
GPM = gallons per minute
GPCD = gallons per capita (person) per day
MGD = million gallons per day
MG/L = milligrams per liter (parts per million, ppm)


1 cubic foot = 7.48 gallons = 62.4 pounds

100 cubic feet = 1 ccf (std. bill unit) = 748 gallons

1 acre-foot* = 43,560 cubic feet = 325,900 gallons

1 cubic foot per second (cfs) = 450 gallons per minute                     

1 cfs = 646,320 gallons per day                     

1 cfs for 24 hours = 1.983 acre-feet               

1 cfs for 30 days = 59.5 acre-feet                  

1 cfs for one year = 724 acre-feet                  

1 million gallons = 3.07 acre feet                  

1 million gallons per day (mgd) = 1,120 acre feet per year               

1000 gallons per minute = 2.23 cfs                

1000 gallons per minute = 4.42 acre-feet per day

 

Metric equivalents                                         

15 million gallons per day (mgd) = 56.775 megaliters pr day (ML/day)                   

1 acre = 0.004 square kilometers (km)                       

78,000 acres = 312 square kilometers (km)               

120 square miles = 193.08 square kilometers            

1 acre foot = 1.233 million liters = 1.233 megaliters 

1 ccf (one hundred cubic feet) or 748 gallons = 2832 liters = 2.832 cubic meters

250 miles = 402.25 kilometers                       

450 miles = 724.05 kilometers

 

1 gallon per minute (gpm) = 3.78 liters per minute                

1 pound per square inch (psi) = 0.07031 kg/sq. cm               

1 cubic feet per second falling 8.81 feet         =          1 horsepower            

1 cubic feet per second falling 10.0 feet = 1.135 horsepower            

1 cubic feet per second falling 11.0 feet = 1 horsepower at 80-percent efficiency               

1 inch depth of water on 1 square mile =        2,323,200 cubic feet = 0.0737 cubic feet per second for 1 year

1 acre foot = 325,900 Gallons            

1 Acre foot = 43,560 Cu. ft                

1 cu ft = 7.48 gals = 62.5 lbs.

1 cfs (cu. ft per sec) 450 GPM = 50 miners inches for 1 hour = 1 acre inch

for 1 hour = 1 acre inch

for 24 hrs = 1.983 acre feet

for 30 days = 59.5 acre feet

for 1 year = 724 acre feet

1 cfs = 646,317 gals. per day

200 cfs = 90,000 gal per minute

1,000,000 gals = 3.07 acre feet

1,000,000 gals. per day = 694.4 GPM = 1.55 cfs

1,000 GPM = 2.23 cfs + 4.42 Acre feet per day

10 cents per 1000 gals. = $32.59 per acre-foot.

1 acre foot supplies family of 5 for 1 year

1 cubic foot = 7.48 gallons = 62.4 pounds of water

1 acre-foot = 43,560 cubic feet = 325,851 gallons

1 cubic foot per second (cfs) = 449 gallons per minute (gpm)

1 cfs for 24 hours = 1.9835 acre-feet

1 cfs for 30 days = 59.5 acre-feet

1 cfs for 1 year = 724 acre-feet

1 million gallons = 3.07 acre-feet

1 million gallons per day (mgd) = 1,120 acre-feet per year = 1.55 cubic feet per second

1,000 gallons per minute = 4.42 acre-feet per day

 *An acre-foot of water is enough to cover one acre of land one foot deep. 

**At a rate of 64 cents per ccf, $1 will buy 1168.75 gallons of water = 4423 liters or 4.424 cubic meters of water for $1 US                   

Copyright © 2011 W.Richard Laton, Ph.D.


Associate Professor of Hydrogeology


California State University, Fullerton


Department of Geological Sciences


(657) 278-7514