engineering

Mount Crosby Weir

Mount Crosby Weir 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 Mount Crosby Weir rather than just read about it. In short: The Mount Crosby Weir is a heritage-listed weir on the Brisbane River at Mount Crosby and Chuwar, both in City of Brisbane, Queensland, Australia. The project was instigated by John Petrie at the end of the 19th century.

Key takeaways

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

Reference excerpt

The Mount Crosby Weir is a heritage-listed weir on the Brisbane River at Mount Crosby and Chuwar, both in City of Brisbane, Queensland, Australia. The project was instigated by John Petrie at the end of the 19th century. The town of Brisbane was expanding and seeking more reliable sources of drinking water than Enoggera Dam and Gold Creek Dam could provide. In conjunction with the Mount Crosby Pumping Station, it was listed on the Queensland Heritage Register on 25 October 2019.

Location and features The location was selected because it was just above the upstream tidal flow of seawater at Colleges Crossing. The concrete structure was completed in April 1892. The dam wall rises 4.57 metres (15.0 ft) and is 81.4 metres (267 ft) in length. The weir has a capacity of 3,430 megalitres (750×10^6 imp gal; 910×10^6 US gal), making it one of the largest weirs in the region. Above the weir is a one-lane road which is open to the public. The nearby Mount Crosby Pumping Station is used to transport drinking water that is sourced from both the weir and the nearby Lake Manchester Dam, which was built shortly after the Mount Crosby Weir. Without an ongoing eradication program, water hyacinth weed can choke the waters behind the weir, all the way upstream to Fernvale. In 2009, the weir was flushed to remove algae and organic matter that had built up.

Heritage listing

Worked examples

Example 1 — a first encounter with Mount Crosby Weir

Start with the simplest possible case. Write down what Mount Crosby Weir 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 Mount Crosby Weir 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 Mount Crosby Weir 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 Mount Crosby Weir

In research: Mount Crosby Weir 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 Mount Crosby Weir 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: Mount Crosby Weir is common in secondary-school and first-year university syllabi. It links to neighbouring topics 1892 establishments in Australia, Australian dam stubs, Brisbane River, so understanding it makes those chapters shorter.
In everyday life: Look for Mount Crosby Weir 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 Mount Crosby Weir in 20 minutes

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

Frequently asked questions

What is Mount Crosby Weir in simple terms?

Why does Mount Crosby Weir 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 Mount Crosby Weir?

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 Mount Crosby Weir.