engineering

The Plunge

The Plunge 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 The Plunge rather than just read about it. In short: The Richmond Municipal Natatorium, commonly known as The Plunge or The Richmond Plunge, is a historic swim center in the Point Richmond neighborhood of Richmond, California. It was closed in August 2001 for seismic retrofitting and reopened in August 2010.

Key takeaways

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

Reference excerpt

The Richmond Municipal Natatorium, commonly known as The Plunge or The Richmond Plunge, is a historic swim center in the Point Richmond neighborhood of Richmond, California. It was closed in August 2001 for seismic retrofitting and reopened in August 2010. It now is back to a regular schedule.

History Promoted by the citizens of Richmond, The Plunge was created through a bond issue in 1926. At that time, it was a "state of the art" two-story building with an indoor warm water swimming pool double the size of an Olympic pool, a fountain, observation balconies, and an open truss ceiling reminiscent of the Sutro Baths in San Francisco. Richmond's population was about 20,000 then, grew to over 200,000 during the "war years" and is now about 110,000.

Over the years, the masonry building deteriorated, the hollow-clay-tile walls cracking after 76 years of deferred maintenance. Richmond Friends of Recreation (RFR) was organized in 1979 as a non-profit organization with the purpose of supporting community recreation programs, spearheaded a major rehabilitation of the pool equipment and repainting of the structure. The Plunge was further damaged in the 1989 Loma Prieta earthquake. City voters rejected a bond measure to reinforce it in 1997. In November 1997, the City Council realized they did not have the funds to retrofit the building and determined they had no option but to close the Plunge permanently. However, even though it was unsafe, people were allowed to swim in it until August 2001, although they had to pass "Swim at your own risk" signs.

When the Plunge was slated for demolition, residents protested and RFR stepped in to work with the City in a unique Public/Private Partnership to raise the necessary funds to retrofit, upgrade and reopen the Plunge. The renovation planning process was complicated by the fact that the Plunge is located in the Point Richmond Historic District, which is on the National Register of Historic Places. This meant that officials had to ensure the renovation would not damage the site's historic value.

Restoration Richmond Friends of Recreation established a "Save the Richmond Plunge Trust" under its tax-exempt status and raised over $154,000 in cash and in excess of $40,000 in-kind donations from local business owners. It committed to an ambitious campaign of appeals to corporations, foundations, and individuals and a calendar of community events to recruit workers and raise funds.

Architect Todd Jersey of Todd Jersey Architecture in Berkeley donated hundreds of hours to the Plunge restoration project, with the hopes of making the Plunge the most environmentally friendly public pool in the country. Jersey raised a portion of the roof to add windows, improving ventilation and light. Overall, the building has more than 170 windows, 132 of which will be able to open and close. The first phase of reconstruction began in August 2008. The Plunge is accessible from Interstate 580 and AC Transit line 72M Macdonald.

Restoration images (August 15, 2009)

References

Illustrations

Worked examples

Example 1 — a first encounter with The Plunge

Start with the simplest possible case. Write down what The Plunge 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 The Plunge 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 The Plunge 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 The Plunge

In research: The Plunge 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 The Plunge 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: The Plunge is common in secondary-school and first-year university syllabi. It links to neighbouring topics 1926 establishments in California, Buildings and structures completed in 1926, Buildings and structures in Richmond, California, so understanding it makes those chapters shorter.
In everyday life: Look for The Plunge 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 The Plunge in 20 minutes

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

Frequently asked questions

What is The Plunge in simple terms?

Why does The Plunge 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 The Plunge?

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 The Plunge.