engineering

Purmer

Purmer is a engineering 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 Purmer rather than just read about it. In short: Purmer is a polder and reclaimed lake in the Netherlands province of North Holland, located between the towns of Purmerend and Edam-Volendam. It is also a village located in the municipalities of Waterland and Edam-Volendam.

Key takeaways

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

Reference excerpt

Purmer is a polder and reclaimed lake in the Netherlands province of North Holland, located between the towns of Purmerend and Edam-Volendam. It is also a village located in the municipalities of Waterland and Edam-Volendam.

Purmer polder Windmill reclamation activity began in 1618. Hydraulic engineer Jan Adriaanszoon Leeghwater also had stakes in the reclamation, although he was not directly involved in the project itself. In 1622 all 26.8 km2 (10.3 sq mi) were clear of water. The original lake of Purmer formed part of a small number of landlocked minor seas located in North Holland. Other examples of such minor seas are the lakes of Beemster and Schermer. All these lakes were directly connected to open sea, so salt water could flow in and tidal movements occurred. Purmer lake was connected to both the Zuyderzee inlet and to Beemster lake. The Purmer's being directly connected to open sea resulted in large-scale shoreline erosion due to wave dynamics and water currents. The high rate of erosion and the need for arable land gave rise to plans for reclamation. Once reclaimed, Purmer was given to farming, but the polder is now highly urbanised. Most of this urban sprawl is due to the town of Purmerend, which has derived its name from Purmer (the "end of Purmer"). During the 1980s and '90s Purmerend had two residential areas built in Purmer, Purmer-Noord and Purmer-Zuid. In contrast to Beemster and Schermer, Purmer is not a municipality in its own right, being divided among the municipalities of Purmerend, Edam-Volendam, and Waterland.

Gallery

References This article is based on the Dutch language article.

Illustrations

Worked examples

Example 1 — a first encounter with Purmer

Start with the simplest possible case. Write down what Purmer claims or describes in one sentence, then invent the smallest concrete situation in which that sentence is true. In engineering, 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 Purmer 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 Purmer 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 Purmer

In research: Purmer appears in engineering 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 Purmer 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: Purmer is common in secondary-school and first-year university syllabi. It links to neighbouring topics Geography of Edam-Volendam, Geography of Purmerend, Hydraulic engineering, so understanding it makes those chapters shorter.
In everyday life: Look for Purmer 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 Purmer in 20 minutes

Read the reference excerpt below once, without taking notes.
Close the page and write down what Purmer 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 Purmer out loud to somebody else — or to Teacher Smith in the lgStudy chat.

Frequently asked questions

What is Purmer in simple terms?

Why does Purmer matter?

Because it connects several engineering 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 Purmer?

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 Purmer.