science

Subsurface dyke

Subsurface dyke is a science topic covered in the lgStudy science library. This page brings together a partial reference excerpt, illustrations, worked examples, real-world applications and a short study plan, so you can understand Subsurface dyke rather than just read about it. In short: A subsurface dyke is a structure that is built in an aquifer with the intention of obstructing the natural flow of ground water, thereby raising the ground water level and increasing the amount of water stored in the aquifer. Acting as an underground barrier impermeable to water, it controls the groundwater flow in an aquifer and raises the water table.

Key takeaways

Subsurface dyke belongs to science; place it in that map before memorising details.
Learn the definition first, then one example that makes the definition concrete.
Connect Subsurface dyke to a quantity you can measure, compute or draw — that is where exam questions come from.
Reproduce the core statement of Subsurface dyke from memory before moving on to harder problems.

Reference excerpt

A subsurface dyke is a structure that is built in an aquifer with the intention of obstructing the natural flow of ground water, thereby raising the ground water level and increasing the amount of water stored in the aquifer. Acting as an underground barrier impermeable to water, it controls the groundwater flow in an aquifer and raises the water table.

Introduction Although the total amount of water on Earth is generally assumed to have remained virtually constant, the rapid growth in population, together with the extension of irrigated agriculture and industrial development, are putting stress on the quality and quantity aspects of natural system. Several institutions have experimented with the use of subsurface dykes to conserve water in water-scarce areas. The ideal location for a dyke is a well defined, wide, greatly sloping valley with a narrow outlet having limited thickness of loose soil or porous rock on the top with massive or impervious rock below. A subsurface dyke has many advantages. It does not require additional surface reservoir, there is no loss of agricultural land, there is minimum evaporation loss since the storage is subsurface, there is no siltation and loss of reservoir capacity, the cost of maintenance is negligible, and it is relatively environment-friendly. One such example was a recent sub-surface dyke constructed in India. For more information about this project, see Krishi Vigyan Kendra Kannur.

Other water harvesting technologies Other rainwater harvesting technologies include stone pitched contour bunds, dry rubble check dams, protection of seasonal spring by afforestation, moisture conservation pits, sprinkler and drip irrigation and roof water harvesting system.

References

External links Krishi Vigyan Kendra Kannur Kerala Agricultural University

Worked examples

Example 1 — a first encounter with Subsurface dyke

Start with the simplest possible case. Write down what Subsurface dyke claims or describes in one sentence, then invent the smallest concrete situation in which that sentence is true. In science, the smallest case is usually a single object, a single equation or a single measurement. Check that every symbol or term in your sentence has a meaning in that case.

Example 2 — changing one variable

Take the situation from Example 1 and change exactly one quantity: double it, halve it, or set it to zero. Predict what should happen to Subsurface dyke before you calculate. Comparing your prediction with the result is the fastest way to find out whether you understand the idea or only the words.

Example 3 — an exam-style question

Typical questions about Subsurface dyke ask you to (a) state it precisely, (b) apply it to given data, and (c) explain a limitation. Practise writing all three answers in under five minutes; the third part is what separates a full-mark answer from an average one.

Applications of Subsurface dyke

In research: Subsurface dyke appears in science research whenever the underlying quantities have to be modelled precisely. Papers usually cite it as a starting assumption and then explore where it breaks down.
In technology and industry: Engineering practice reuses Subsurface dyke in design rules, simulations and safety margins. Knowing the idea lets you read a specification sheet and understand why the numbers look the way they do.
In the classroom: Subsurface dyke is common in secondary-school and first-year university syllabi. It links to neighbouring topics Aquifers, Hydrology, Water conservation, so understanding it makes those chapters shorter.
In everyday life: Look for Subsurface dyke outside the textbook — in sport, cooking, traffic, electronics or the sky above you. An example you found yourself is remembered far longer than one you were given.

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How to study Subsurface dyke in 20 minutes

Read the reference excerpt below once, without taking notes.
Close the page and write down what Subsurface dyke means in your own words.
Compare your version with the excerpt and mark what you missed.
Work through the three examples above with pen and paper.
Explain Subsurface dyke out loud to somebody else — or to Teacher Smith in the lgStudy chat.

Frequently asked questions

What is Subsurface dyke in simple terms?

Why does Subsurface dyke matter?

Because it connects several science ideas at once: it gives you a definition you can apply, a quantity you can calculate, and a way to check whether a result is plausible.

How should I study Subsurface dyke?

Read the excerpt, restate it from memory, then work through the examples and applications listed on this page. The five-step study plan above takes about twenty minutes.

What does this page cover?

It gives you a compact reference excerpt plus original lgStudy explanations, examples, applications and study material on Subsurface dyke.