Chuuk and Yap States,
FSM |
IS THE TANK
YOU ALREADY HAVE BIG ENOUGH?
The steps that you should follow if you
want to know if your OLD tank is BIG enough are exactly
the same as you used to determine the size of a NEW
tank except that you will also have to find out the
number of gallons of water that your tank will hold.
Here's the additional step:
STEP 7.
Find the SIZE of your tank (in gallons). See the sketch
below for a description of the terms used.
Multiply 5.87 times height times diameter
times diameter.
Tank Size = 5.87 x ________ x _________
x _________
Height Diameter Diameter
You will also have to use the charts
in the back of the booklet in a slightly different
way. This will be covered in example three which follows.
EXAMPLE THREE
Your roof is 42 feet long and 47 feet wide.
You have gutters around the entire roof but they leak
a lot. There are 8 people in your home. Your tank is
9.5 feet in diameter and 6 feet high. Is your tank BIG
enough for your family?
Step 1.
Length = ______feet
Width = ______feet
Step 2.
s_____ x ______ = ______
length width roof size
Your answer should be 1,974 square feet.
Step 3.
s_______ roof factor
Step 4.
________ gutter factor
Step 5.
______x________ x ________ =________
roof size roof factor gutter factor usable roof size
Your answer should be approximately 1184
square feet.
Step 6.
________people
Step 7.
5.87 x _______ x_______ x______ = _______ gallons
height diameter diameter tank size
Your answer should be approximately 3,179
gallons.
Step 8.
Now go to the chart for usable roof sizes between
1,000 and 1,200 square feet and look at the row for
8 people. Your tank is very close to the 3,100-gallon
tank. So, let's look at the green boxes. The chart
says that your tank is big enough for your family
if you stop using the water in it for bathing and
washing clothes when the level decreases below 1/2
full.
EXAMPLE FOUR
Now suppose that you have a usable roof
size of 500 square feet a 1,400-gallon tank and that
there are 12 people in your household. Is your tank
BIG enough?
Look at the chart for usable roof sizes
between 400 and 600 square feet and the row of the chart
corresponding to 12 people. Since red, the color corresponding
to a 1,400-gallon tank, does not appear on the chart,
your tank is too small. For your family, a 5,700-gallon
tank (blue box) is required and the tank water must
NEVER be used for bathing or washing clothes.
HAVING TROUBLE??
The author of this bulletin is hopeful
that the procedures, charts and examples will help you
in designing a new or evaluating an existing roof rainwater
catchment system. If you are having trouble using the
charts and examples or if your system does not seem
to fit the charts provided, please contact your local
sanitarian or contact Dr. Leroy Heitz at the address
and numbers listed on the last page of this bulletin
or e-mail directly [email protected].
TANK
SIZING TABLES
Click on Appropriate Table
For the usable
roof size of: |
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FOR
USABLE ROOF SIZE OF 100 TO 200 SQUARE FEET
Stop using
water for bathing and washing clothes when
water level is below |
PEOPLE |
FULL |
3/4
FULL |
1/2
FULL |
1/4
FULL |
5 |
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4 |
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3 |
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2 |
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1 |
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ROOF
TOO SMALL |
500
GALLONS |
1
BAR
1400 Gallons |
1
1/2 BAR
3100 Gallons |
2
BAR
5700 Gallons |
FOR
USABLE ROOF SIZE OF 200 TO 400 SQUARE FEET
Stop using
water for bathing and washing clothes when
water level is below |
PEOPLE |
FULL |
3/4
FULL |
1/2
FULL |
1/4
FULL |
10 |
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9 |
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8 |
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7 |
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2 |
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1 |
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ROOF
TOO SMALL |
500
GALLONS |
1
BAR
1400 Gallons |
1
1/2 BAR
3100 Gallons |
2
BAR
5700 Gallons |
FOR
USABLE ROOF SIZE OF 400 TO 600 SQUARE FEET
Stop using
water for bathing and washing clothes when
water level is below |
PEOPLE |
FULL |
3/4
FULL
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1/2
FULL
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1/4
FULL
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14 |
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13 |
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12 |
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11 |
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3 |
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2 |
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1 |
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ROOF TOO SMALL |
500
GALLONS |
1 BAR
1400 Gallons |
1 1/2 BAR
3100 Gallons |
2 BAR
5700 Gallons |
FOR
USABLE ROOF SIZE OF 600 TO 800 SQUARE FEET
Stop using
water for bathing and washing clothes when
water level is below |
PEOPLE |
FULL |
3/4
FULL
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1/2
FULL
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1/4
FULL
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15 |
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14 |
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13 |
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12 |
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11 |
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3 |
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2 |
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1 |
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ROOF
TOO SMALL |
500
GALLONS |
1
BAR
1400 Gallons |
1
1/2 BAR
3100 Gallons |
2
BAR
5700 Gallons |
FOR USABLE ROOF SIZE OF 800 TO
1000 SQUARE FEET
Stop using
water for bathing and washing clothes when
water level is below |
PEOPLE |
FULL |
3/4
FULL
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1/2
FULL
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1/4
FULL
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17 |
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16 |
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15 |
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14 |
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2 |
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1 |
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ROOF
TOO SMALL |
500
GALLONS |
1
BAR
1400 Gallons |
1
1/2 BAR
3100 Gallons |
2
BAR
5700 Gallons |
FOR
USABLE ROOF SIZE OF 1000 TO 1200 SQUARE FEET
Stop using
water for bathing and washing clothes when
water level is below |
PEOPLE |
FULL |
3/4
FULL |
1/2
FULL |
1/4
FULL |
18 |
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17 |
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16 |
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15 |
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14 |
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2 |
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1 |
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ROOF
TOO SMALL |
500
GALLONS |
1
BAR
1400 Gallons |
1
1/2 BAR
3100 Gallons |
2
BAR
5700 Gallons |
FOR
USABLE ROOF SIZE OF 1200 TO 1400 SQUARE FEET
Stop using
water for bathing and washing clothes when
water level is below |
PEOPLE |
FULL |
3/4
FULL |
1/2
FULL |
1/4
FULL |
20 |
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ROOF
TOO SMALL |
500
GALLONS |
1
BAR
1400 Gallons |
1
1/2 BAR
3100 Gallons |
2
BAR
5700 Gallons |
FOR USABLE ROOF SIZE
OF 1400 TO 1600 SQUARE FEET
Stop using
water for bathing and washing clothes when
water level is below |
PEOPLE |
FULL |
3/4
FULL |
1/2
FULL |
1/4
FULL |
21 |
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20 |
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1 |
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ROOF
TOO SMALL |
500
GALLONS |
1
BAR
1400 Gallons |
1
1/2 BAR
3100 Gallons |
2
BAR
5700 Gallons |
FOR
USABLE ROOF SIZE OF 1600 TO 1800 SQUARE FEET
Stop using
water for bathing and washing clothes when
water level is below |
PEOPLE |
FULL |
3/4
FULL |
1/2
FULL |
1/4
FULL |
23 |
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22 |
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21 |
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