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Computing water usage costs - march
Here is how to compute the cost per hour of water usage
First determine the local pressure/flow. Turn the hose on and determine
time (in minutes or fraction thereof) it takes to fill a one gallon
pail. Divide that
number into 60.
This produces gallons per hour. This number then has to be
converted to cubic feet per hour. (100 cubic feet = 748 gallons)
one gallon = .134 cubic foot)
Multiply the number of gallons per hour times .134 to determine how many
cubic feet per hour used.
In the city of Newton (MA) the water rates are:
Water and Sewer Rates effective as of 07/01/2010
to 20 hcf
$5.14 $7.28 $12.42
to 70 hcf
$6.17 $8.74 $ 14.91
Using the $12.42 amount multiply cubic feet per hour times $.1242 to
dollar per hour cost of outside watering (the 12.42 is for a hundred
Example:If the usage is 300
gallons per hour 300 times .134 = 40.2 cubic feet/hr.
If the price of water/sewer is $12.42 per hundred cubic feet
that is $.124 per cubic foot.
40.2 cubic feet times .124 equals $4.98
hour cost of outside watering.