 ## Drinkable water

The new data collection has started! After a preliminary phase, here is a new questionnaire you can take part in from the 25th of May to the 20th of July. Help us collect new data on the counters, answer the few simple questions of "HOW MUCH WATER DO YOU USE?!" to get more precise data on your domestic consumption!

### How to read the water meter

#### Types of water meters

The types of water meters mounted in homes can be of three types:

1. Hand counters;  3. Electronic. You may find only one or two: in the first case you have the autonomous boiler in the house and this means that the hot water you produce by yourself and therefore this single meter measures the consumption of incoming cold water; while if you have two meters it is because the hot water is produced by a condominium boiler so you will find a meter for hot water and one for cold water, both inlet.

#### If you have a HAND COUNTER:

1. Start with the 4 watches with the black hands representing the integers (they measure the thousands, hundreds, tens and units respectively). Proceeding clockwise to the left (from the dial with indicated × 1000) mark the numbers indicated by the arrow and multiply them.
• the first× 1000 m³
• the second × 100 m³
• the third × 10 m³
• the fourth × 1 m³
Next to each circle is indicated the value by which to multiply the number!
Attention: if the hand is between two numbers, mark the lowest number (already exceeded by the hand) not the one yet to be reached!
2. Switch to 3 watches with red hands-counter that show decimal numbers (measure hectoliters, decaliters and liters), sign the numbers and multiply
• the first × 0,1 m³
• the second × 0,01 m³
• the third × 0,001 m³
Thought the hand-counter is between two numbers, you have to sign the lowest number (already exceeded by the hand) not the one yet to be reached!
3. Add up everything you have signed and observed your m³ consumed!
es. 00240 + (9 × 0,1) + (9 × 0,01) + (4 × 0,001) + (5 × 0,0001)= 240,9945 m³
4. Convert to litres (1 m³ = 1000 l), so multiply the value obtained × 1000. es. 240,9945 m³ × 1000 = 240994,5 l

#### If you have a NUMBERING, DIAL or DIRECT READING COUNTER:

1. Start from the left and read the black numbers shown in the dial represent the whole numbers in m³ (ignore the zeros on the left of the first number!)
Attention: if the figure is not well aligned, you have to sign the lowest number!
2. Read the red numbers, (to the right of the dial) they represent the decimals in m³ often separated from the previous ones by a comma.
If you have 4 red hands representing decilitres, litres, decaliters and hectolitres, you have to multiply
• the leftmost number × 0,0001 m³
• the second × 0,001 m³
• the third × 0,01 m³
• the fourth × 0,1 m³
3. Convert all your numbers from m³ into liters (1m³ = 1000 l), so you have to multiply your result × 1000. es. 240,9945 m³ × 1000 = 240994,5 l
Sources:

### First detection results

From 9 to 24 May we made a first data collection, these are some of the results obtained (click to zoom). We found out that the per capita consumption of water decreases as the number of people per family unit increases.
The data of the graph:

• y = -31,008x + 292,96
• r = -0,436
• R2 = 0,190
• P = 0,000083

We found out that the observed per capita consumption is lower than the one estimated by studies previously.
The data of the graph:

• y = -0,7602x + 31,448
• r = 0,357
• R2 = 0,127
• P = 0,00155 