The Future Scientist Series : Letter 10

 Every Drop Has a Story : How Water Built Civilisations—and Why Protecting It Is Protecting Life Itself

My dear Ayan/Saad,

Assalamu Alaikum wa Rahmatullahi wa Barakatuh.

Before reading this letter, I want you to do something simple.

Go to the kitchen. Fill a glass with water. Hold it in your hand. Look at it carefully.

It looks ordinary, doesn't it?

Colourless.                Odourless.                Transparent.

Now let me tell you something extraordinary.

The water in your glass may once have been part of:

• a Himalayan glacier,
• a monsoon cloud over Kerala,
• the Ganga flowing past Varanasi,
• an elephant drinking from a forest pond,
• or even the ocean crossed by ancient sailors.

Water is the greatest traveller on Earth. It never truly disappears.   It simply changes its journey.

And today, I want you to follow that journey.

 

The First Great Teacher

Imagine two groups of people thousands of years ago.

One settles beside a river. The other settles in a dry desert. Which community is more likely to flourish?

History gives us the answer.

The world's earliest great civilisations—the Indus Valley, Egypt, Mesopotamia, and China—all grew beside rivers.

They understood something we still sometimes forget: Water is not merely a resource.

It is the foundation of civilisation.           Where water flows, life follows.

 

A Journey of One Drop

Close your eyes. Imagine one tiny drop of water. It begins deep in the Indian Ocean. The Sun warms the sea. The drop evaporates. It rises into the sky. Thousands of other drops join it. Clouds form. The monsoon winds carry them across India. Rain falls over the Himalayas. Part of the rain becomes snow. Part enters rivers. Part soaks into the soil. Some reaches underground aquifers.

Months later...a farmer pumps groundwater to irrigate wheat.

The wheat becomes flour. The flour becomes bread. You eat the bread. The same water now becomes part of your body.

Eventually it returns to the atmosphere.

One drop!      An endless journey!

Scientists call this the water cycle.

But I like to think of it as Allah's perfect recycling system.

 

What Is a Watershed?

Imagine placing your hands together to form a bowl. Now pour a little water into it. The water naturally flows towards the lowest point.

Nature does something similar.

Every hill, valley and mountain directs rainwater into streams and rivers.

The entire area from which rainwater drains into a particular river is called a watershed.

A watershed is like the river's home.

If we destroy forests on the hills...the rivers below suffer.

If we protect the watershed...the river remains healthier.

This is why environmental scientists say: "Protect the land above the river if you wish to protect the river itself."

 

Ancient India Already Understood This

Long before satellites and computers, people in India developed brilliant ways of conserving water.

Let me introduce you to few remarkable examples.

Ø  The Johad

In Rajasthan, where rainfall is scarce, villagers built small earthen embankments called Johads. During the rainy season, these structures captured rainwater. Instead of rushing away, the water slowly seeped into the ground.

Wells remained full for months afterwards.      Simple!  Inexpensive!  Brilliant!

Ø  Kunds

Also in Rajasthan, people built underground circular tanks called Kunds to collect rainwater.

Even in dry regions, families had clean water available throughout the year.

Ø  The Eri System

Travel to Tamil Nadu. There, villages developed interconnected irrigation tanks known as the Eri system.

One tank overflowed into another. Every drop was used carefully. The system supported agriculture for centuries. These examples remind us that innovation did not begin in modern laboratories.

Our ancestors were remarkable engineers too.

 

The Ramsar Convention

Now imagine a wetland. Perhaps you think it is simply a muddy area full of mosquitoes. Many people once thought the same.

Scientists discovered something different. Wetlands store floodwater. Recharge groundwater. Support birds, fish and countless other species. Filter pollutants naturally.

Because wetlands are so valuable, countries signed the Ramsar Convention, an international agreement to protect wetlands of global importance.

Sometimes the places we value least are the ones nature values most.

 

Can We Harvest Rain?

Suppose your family receives a salary once every month. Would it make sense to spend everything on the first day?

Of course not! You would save some for later.

Rain works the same way.

India receives enormous amounts of rainfall during the monsoon. Yet many places face water shortages only a few months later. The problem is not always lack of rain.

Often, it is poor storage.

Rainwater harvesting simply means collecting rainwater before it escapes.

Ø  Roof-Top Rainwater Harvesting

Imagine rain falling on your roof.            Usually it flows into drains and disappears. Instead, pipes can guide that water into storage tanks or underground recharge pits.

The water can later be used for:

• gardening,
• washing,
• groundwater recharge,
• and sometimes even drinking after proper treatment.

Every roof can become a small reservoir.

Ø  Small Dams or Big Dams?

This is one of the most interesting debates in environmental science.

Large dams provide:

• irrigation,
• hydroelectric power,
• drinking water,
• flood control.

But they may also:

• displace villages,
• submerge forests,
• affect fish migration,
• change river ecosystems.

Small dams, check dams and run-of-the-river projects often have fewer environmental impacts.

However, they cannot always replace very large reservoirs.

Environmental scientists therefore avoid simple answers. Instead they ask:

"Which solution is most suitable for this particular river and community?"

Good science considers context.

 

Water Can Be Used Again

Imagine washing vegetables. The water is no longer suitable for drinking.

But could it water plants?                                      Certainly!

Now imagine an entire city.

Can wastewater be treated and reused?             Yes.

Modern treatment plants clean waste-water so that it can be used again for industries, agriculture or groundwater recharge.

Every litre reused means one litre less taken from rivers and aquifers. The future belongs not to those who consume the most water—but to those who reuse it wisely.

 

Rethinking the Toilet

Here is a surprising idea. Most toilets use clean drinking water to carry away waste.

Scientists began asking:     "Is this the best use of our most precious resource?"

Alternative systems such as dry compost toilets separate waste from water.

Properly managed, human waste can be safely composted and used to improve soil fertility. The idea may sound unusual at first. But it reminds us that good science often begins by questioning familiar habits.

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Faith Meets Science

Allah says: "And We made from water every living thing. Will they not then believe?" (Surah Al-Anbiya 21:30)

This verse has always filled me with wonder.

Modern biology tells us that every living cell depends on water. The Qur'an expressed this profound truth more than fourteen centuries ago—not as a scientific textbook, but as a sign inviting reflection.

ü  Every river.

ü  Every cloud.

ü  Every raindrop.

ü  Every glass of water.

Each is a reminder that life itself is one of Allah's greatest gifts.

 

A Lesson from the Prophet ﷺ

One day, the Prophet Muhammad ﷺ performed wudu using only a small amount of water.

His companions learned that cleanliness does not require wastefulness.

Later, he advised: "Do not waste water, even if you are at a flowing river." (Reported by Ibn Majah)

Think about how remarkable this guidance is. A flowing river appears limitless.

Yet the Prophet ﷺ taught restraint.

Environmental science now calls this water conservation. Islam calls it gratitude and moderation.

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Think like a Water Engineer

The next time it rains, ask yourself:

• Where does this rainwater go?
• Could some of it be stored?
• Does it recharge groundwater?
• Is it causing erosion?
• Could my school harvest this rain?

Engineers begin by asking questions that others overlook.

 

ICSE Exam Corner

Key Concepts

✔ Watershed

✔ Watershed management

✔ Johad

✔ Kund

✔ Eri system

✔ Ramsar Convention

✔ Rainwater harvesting

✔ Small dams

✔ Large dams

✔ Water recycling

✔ Dry compost toilets

Possible Examination Questions

1. Define a watershed and explain its importance.
2. Describe two traditional Indian methods of water conservation.
3. Explain the advantages of rainwater harvesting.
4. Compare small dams and large dams.
5. State the objectives of the Ramsar Convention.
6. Explain why water recycling is important for sustainable development.

 

Your Mission This Week

Become a Water Auditor.

For one day, observe how water is used in your home.

Make a simple table:

Activity	Approximate Water Used	Could It Be Reduced?	Could It Be Reused?
Brushing
Bathing
Washing clothes
Cooking

Then answer these questions:

• Which activity uses the most water?
• Which activity wastes the most water?
• What are three practical changes our family could make to conserve water?

Remember, scientists improve what they first measure.

 

Before I Signoff...

Ayan/Saad, people often say,        "Water is life."

After today's letter, I hope you see that this is not merely a slogan.

Water is memory.    Water is history.      Water is civilisation.           Water is mercy.

Long before engineers designed dams, before governments built reservoirs, and before satellites monitored rivers, Allah had already placed within the water cycle a perfect system of renewal.

Our responsibility is not to improve upon His design.

It is to protect it from our carelessness.

The day you begin seeing every drop as a trust rather than a possession, you will have understood one of the greatest lessons in environmental science.

May Allah make you among those who never waste His blessings, who value every drop, and who leave behind rivers cleaner than they found them.

With all my love, my prayers, and my hope that you will always become a guardian of water,

Yours Abba