# Mathematically speaking, what is the value of every drop of water?

“Every drop counts.” We often hear this tagline when we talk about water conservation. But how much (really) does each drop counts? I came across a Water Droplet Calculator that shed some light. Let’s do some mathematics.

There are 30,000 drops of water in a 1.5 litre water bottle. Each year, about 15,000 men enlist into the Singapore Armed Forces. If each recruit saves 2 drops of water each, we will have enough water to fill up a 1.5 litre bottle.

There are 2.5 million litres of water in a swimming pool. That is equivalent to 50 billion (50,000,000,000) drops of water. Singapore’s population is more than 5 million. If each Singaporean saves 10 drops of water for 100 days, we will be able to fill an Olympic-size swimming pool.

The famous Bellagio Water Fountain shoots a maximum of 17,000 gallons of water in the air at any time. That is equivalent to 1.2 billion drops of water. The population of China is more than 1.3 billion. Each person in China only needs to save one drop of water for us to form another Bellagio fountain.

A 70kg man is made up of 42 litres of water. That amounts to 840,000 droplets. As the average life expectancy of a Singaporean is 84 years, each individual only needs to save 10,000 drops of water a year or one drop of water every 52 minutes to save a ‘human-worth’ of water.

Lastly and most importantly, studies calculated that a person should drink 3 litres of water a day. That is 60,000 drops of water. If you save two drops of water each day, you will save 730 drops of water a year and 61,320 droplets in your lifetime. That actually can help someone live another day.

Therefore, mathematically saying, every drop does count.

By Walter Wallace