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A short class with Sarah and her students. The other ways are under More.
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Today, we are going to learn about water reservoirs. These are places where water is stored in various forms on our planet. Can anyone tell me what they think a water reservoir is?
I think it’s like a big tank that holds water, right?
That's a great start! A water reservoir can indeed be understood that way. However, it also includes natural sites like oceans, glaciers, and lakes. Can anyone guess where the majority of Earth’s water is stored?
Is it in the oceans?
Yes! Around 96.5% of Earth's water is in the oceans. Remember the acronym OGG-FISAR to help you recall where water is stored: Oceans, Glaciers, Groundwater, Freshwater lakes, Inland seas, Soil moisture, Atmosphere, Rivers, and Biosphere. This will help us remember the different reservoirs throughout our discussion.
What about groundwater? Is that a big reservoir too?
Absolutely! Groundwater is about 1.7% of the total water supply, which is significant for many communities. Let’s remember, most of our accessible freshwater comes from these smaller reservoirs, even if they represent a tiny fraction overall.
So, not all water is usable for people?
Correct! Less than 1% of Earth's water is freshwater that people can actually use. Understanding this is crucial for managing our precious water resources.
Let’s talk about the specific types of reservoirs and their volumes. Oceans are the largest. Can anyone detail some of the other reservoirs?
We have ice caps and glaciers next, right?
Exactly! Ice caps and glaciers comprise about 1.74% of the Earth’s water. How about lakes?
Yes! Freshwater lakes are around 0.007%.
Correct! And then we have reservoirs like soil moisture and the atmosphere. They hold much less water, only about 0.001%. To help you remember, think about how much water we each drink from lakes or rivers compared to the vast oceans.
What about rivers? How much water do they hold?
Rivers are quite minimal, holding just around 0.0002%. It shows just how vital efficient water management is in areas like irrigation and drinking sources.
So, even though the oceans are huge, we can still run out of fresh water?
Yes, and that’s a great connection! We need to be conscious of our freshwater usage, as our needs are not met by merely accessing larger reservoirs like oceans.
Oceans vast and deep, three-fourths they keep; Glaciers cool and grand, water's icy hand.
Imagine a giant ocean holding a treasure chest filled with water. Around it, smaller lakes and rivers represent the streams of this treasure flowing back to the land.
To remember major reservoirs, think OGG-FISAR: Oceans, Glaciers, Groundwater, Freshwater lakes, Inland seas, Soil moisture, Atmosphere, Rivers, and Biosphere.
WATER - Water Accessible To Every Resource (to recall limited freshwater resources).
Term
What percentage of Earth's water is ocean water?
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Term
What is the primary component of Earth’s freshwater?
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Term
Which reservoir has the least amount of water?
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Locations where water is stored in different forms on Earth, including oceans, glaciers, groundwater, lakes, rivers, and the atmosphere.
Water that is not significantly salty and is suitable for drinking and irrigation.
Water that resides in the underground aquifers, contributing to the overall water supply.
The continuous movement of water on, above, and below the surface of the Earth.
Water reservoirs are key components of the global water budget, representing the different forms and storage locations of water on Earth.
This section outlines the various water reservoirs on Earth, highlighting their respective volumes and significance. It emphasizes that while oceans hold the vast majority of Earth's water, freshwater resources available for human use are extremely limited.
The Earth's water reservoirs are crucial for understanding the global water budget, which quantifies the distribution and volume of water across the planet. The section provides an overview of different types of water reservoirs and their approximate volumes:
Despite the significant volume of water in oceans, less than 1% of this water is freshwater accessible for human needs. Understanding these reservoirs is fundamental for water management, engineering, and addressing global challenges like climate change.