Can you drink all the water in an Olympic size swimming pool? (Day 220)

Swimming poolIf you’re a fan of the Olympics, and swimming in particular, you’ll be familiar with the size of the pool (50 m x 25 m). But have you ever wondered how much water it holds and how long it might take for one person to drink it?

Depending on depth, the pool will hold between 1.25 million litres of water (1 m depth) to 2.5 million litres of water (2 m depth). And if you assume we all drink between 2-4 litres of water each day, that would take over 3,400 years for one person to consume.

In fact, many of us will consume all the water in the smaller size swimming pool in just one year. It’s all due to the amount of ‘hidden water’ we consume in our food.

These numbers may be hard to believe but here’s a few examples of how easy it is to build up your water footprint based on three main meals a day – even without dessert!

Breakfast – 1,260 litres

Meal
A breakfast of two eggs, two sausages, beans, two slices of toast and butter has a water footprint of 1260.5 litres. Data and image courtesy of Onedrop.org. Click image to visit website.

Continue reading Can you drink all the water in an Olympic size swimming pool? (Day 220)

What’s the water cost of your food? (Day 143)

Yesterday was World Food Day and I’ve taken the opportunity to explore one of the lesser known challenges involved in providing enough food to an expanding population.

The numbers illustratCEM just logoe the challenge – we ‘eat’ 3,496 litres of water everyday and it is one of the issues being explored in IChemE’s first green paper, published yesterday, as a part of our Chemical Engineering Matters technical policy.

Generally, a ‘green paper’ is a policy document designed to stimulate discussion with a wider audience and get the conversation started about what we should do next.

It’s a phrase and approach IChemE is borrowing to help lead the debate on key issues around energy, water, food and health.

Our first green paper – called Water Management in the Food and Drink Industry’ – discusses the importance of water management in the food and drink industry, and the role that chemical engineers play in this.

Continue reading What’s the water cost of your food? (Day 143)