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CONVERSION FACTORS
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Length
Surface
Volume
Discharge/Flow
Velocity
Weight, Mass
Pressure
Angular Distance
Power
Work
Hydrologic Equivalents

Length
Multiply By To Obtain
Miles 1.60935 Kilometers
1,760 Yards
5,280 Feet
63,360 Inches
Meters 0.00062137 Miles
1.0936 Yards
3.28088 Feet
39.37 Inches
100 Centimeters
0.001 Kilometers
Yards 0.9144 Meters
0.00056818 Miles
3 Feet
36 Inches
Feet 0.3048 Meters
0.00018939 Miles
0.33333 Yards
12 Inches
Inches 0.08333 Feet
0.027778 Yards
0.000015783 Miles
2.54 Centimeters
Surface
Multiply By To Obtain
Square Miles 4,014,489,600 Square inches
27,878,400 Square feet
3,097,600 Square yards
640 Acres
259 Hectares
Acres 0.0015625 Square miles
43,560 Square feet
4,840 Square yards
4,047 Square meters
0.404687 Hectares
Square yards 0.0000003228 Square miles
9 Square feet
1,296 Square inches
0.83613 Square meters
0.0002066 Acres
Square feet 0.0000003587 Square miles
0.11111 Square yards
144 Square inches
0.092903 Square meters
Square inches 0.0000000002491 Square miles
0.0007716 Square yards
0.006944 Square feet
6.45163 Square centimeters
0.0000001594 Acres
Volume
Multiply By To Obtain
Acre-feet 325,851 US Gallons
43,560 Cubic feet
1,613.3 Cubic yards
1,233.49 Cubic meters
Cubic yards 46,656 Cubic inches
27 Cubic feet
0.00061983 Acre-feet
0.76456 Cubic meters
Cubic feet 1,728 Cubic inches
7.4805 US gallons
0.000022957 Acre-feet
0.037037 Cubic yards
28.317 Liters
US Gallons 231 Cubic inches
0.13368 Cubic feet
0.00000307 Acre-feet
3.78543 Liters
Cubic inches 16.3872 Cubic centimeters
0.0005787 Cubic feet
0.004329 US Gallons
Discharge/Flow
Multiply By To Obtain
Cubic feet per second 448.8 US gallons per minute
60 Cubic feet per minute
3,600 Cubic feet per hour
86,400 Cubic feet per day
723.97 Acre-feet per year
1.984 Acre-feet per day
0.9917 Acre-inches per hour
50 Miner's inch in ID, KN, NB, SD, ND, NM, UT, WA
40 Miner's inch in AZ, MT, OR, NV, CA
38.4 Miner's inch in CO
0.028317 Cubic meters per second
1.699 Cubic meters per minute
101.941 Cubic meters per hour
2,446.58 Cubic meters per day
Million gallons per day 1.547 Cubic feet per second
3.07 Acre-feet per day
2.629 Cubic meters per minute
US gallons per minute 0.06309 Liters per second
3.7854 Liters per minute
Velocity
Multiply By To Obtain
Feet per second 0.68 Miles per hour
1.097 Kilometers per hour
30.48 Centimeters per second
Inches per hour 2.54 Centimeters per hour
Feet per year 0.3048 Meters per year
Weight, Mass
Multiply By To Obtain
Pounds, avoirdupois 0.4536 Kilograms
16 Ounces
7,000 Grains
1.215 Pounds, troy
Kilograms 1000 Grams
15,432 Grains
2.2046 Pounds, avoirdupois
Tons (2,000 pounds) 907.185 Kilograms
Pressure
Multiply By To Obtain
Atmosphere, at sea level 76 Centimeters of mercury
29.92 Inches of mercury
33.90 Feet of water
14.70 Pounds per square inch
Feet of water column (at 20° C) 2.246 Centimeters of mercury column
0.03041 Kilograms per square centimeter
0.4333 Pounds per square inch
Angular Distance
Multiply By To Obtain
Degrees 60 Minutes
3,600 Seconds
0.07145 Radians
Power
Multiply By To Obtain
Horsepower 33,000 Foot-pounds per minute
550 Foot-pounds per second
745.7 Watts
0.7457 Kilowatts
1.014 Horsepower (metric)
Horsepower (metric) 75 Kilogram-meters per second
Work
Multiply By To Obtain
British thermal units 778 Foot-pounds
1,055 Joules
Hydrologic Equivalents
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 cubic feet per second flowing for 1 year will cover 1 square mile 1.131 feet, or 13.572 inches, deep
1 inch depth of water on 1 square mile = 2,323,200 cubic feet = 0.0737 cubic feet per second for 1 year
1 cu ft = 7.48 U.S. Gallons = 62.5 lbs.
1 cfs (cu. ft per sec) 450 GPM = 50 miners inches
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
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