Environmental Science

Environmental Science
Estimating Water Usage:

In the table below, provide the required information and enter the information about your household’s annual water usage from the water use calculator. To calculate
the percentage for each category, simply divide the value in each category by the Total Household Use and multiply by 100 (to convert proportion to percentage).

Per Capita Daily Use (gallons) Percentage of Total
Bathroom
Toilets
Faucets
Laundry
Dishwasher
Hand Washing Dishes
Lawn Watering
Other Outdoor Uses
Total Household Use
Which category comprised the greatest percentage of your household’s water use? Was this surprising to you? Why or why not?
Many people in rural areas in developing countries must still carry water from its source to their homes. If you were to carry the amount of water used per person in
your household on an average day, and a gallon of water weighs approximately 8.3 lbs, how many pounds of water would you need to carry each day?

Water Use Analysis:

Enter the “Total Per Capita Gallons of Water Used in the House” values from the calculator in the table below.

Per Day Per Month Per Year
Your Household
Tampa Average

How did your household’s water usage compare to the Tampa, Florida average?

As water use varies geographically in the United States, the national average annual water use per person in 1995 was estimated to be 65,335 gallons, considerably
higher than the Tampa average (United States Geological Survey, http://water.usgs.gov/watuse/pdf1995/html/). How did your water use compare to this figure? Please
explain what the differences may be attributed to.

Analyzing Changes:

Examine how small changes in lifestyle would affect your household’s total water usage. Return to the water calculator and make a reasonable change that would reduce
your overall water usage – describe the change in the table below. Press “Calculate” after making the change, calculate the number of gallons saved per year, and
enter it in the table. Reset the calculator to its original values, and repeat the procedure for two additional changes.

Change Reduction in Annual
Water Use (gal)

Seeing the reductions in water use that occur as a result of these changes, would you be willing to immediately implement any of them? Explain why or why not.
Losses from Drips and Leaks:

Open the WaterWiser Drip Calculator, enter the values in the table below in the “# of drips per minute” box, hit the “Now Calculate” button, and enter the results in
the table. Let’s assume that your home has leaks like those listed. For each of the drip rates, add the Daily Waste from leaks to your Total Per Capita Daily Use
from the Tampa Water Calculator. This would be your new Total Daily Water Use. Then calculate the percentage of the total water used that is due to the leak. As you
did previously, simply divide the Daily Waste value by the Total Household Use and multiply by 100 (to convert proportion to percentage).
Total Per Capita Daily Use from Tampa Water Calculator: ____________________ gallons

Drips per Minute Daily Waste (gal) New Total Daily Water Use (gal) Percentage of
Total Due to Leak
5
10
15
30
60
Compare the percentages of water use due to the leak to the percentages for the other categories (Bathroom, Toilets, Faucets, etc.) from your initial run of the water
calculator. For each drip rate, list the category with the closest percentage. To do this, take a look at the percentage you calculated in the previous table for
each drip rate. Now look at the very first table. For example, if you had .95% for 5 drip rate, you would choose Dishwasher from the first table b/c .95% is the
closest to 1.66%. You would then put “.95%” in the first row, second column and “Dishwasher” in the first row, third column.
Drips per Minute Percentage of Total Due to Leak (gal) Category with Closest Percentage from Initial Run of Water Calculator
5
10
15
30
60
Does seeing the potential losses in leaks cause you to check your home for leaking pipes and toilets? Explain why or why not
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