science

Latrine

Latrine 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 Latrine rather than just read about it. In short: A latrine is a toilet or an even simpler facility that is used as a toilet within a sanitation system. For example, it can be a communal trench in the earth in a camp to be used as emergency sanitation, a hole in the ground (pit latrine), or more advanced designs, including pour-flush systems.

Key takeaways

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

Reference excerpt

A latrine is a toilet or an even simpler facility that is used as a toilet within a sanitation system. For example, it can be a communal trench in the earth in a camp to be used as emergency sanitation, a hole in the ground (pit latrine), or more advanced designs, including pour-flush systems. The term "latrine" is still commonly used in military parlance, and less so in civilian usage except in emergency sanitation situations. Nowadays, the word "toilet" is more commonly used than "latrine", except when referring to simple systems like "pit latrines" or "trench latrines". The use of latrines was a major advance in sanitation over more basic practices such as open defecation, and helped control the spread of many waterborne diseases. However, unsafe defecation in unimproved latrines still remained a widespread problem by the end of 2020, with more than 3 billion people affected (46 % of the global population). Eradication of this public health threat is one of the United Nations' 17 goals for sustainable development.

Terminology The word "latrine" is derived from the Latin lavatrina, meaning bath. Today it is commonly used in the term "pit latrine". It has the connotation of something being less advanced and less hygienic than a standard toilet. It is typically used to describe communal facilities, such as the shallow-trench latrines used in emergency sanitation situations, e.g. after earthquakes, floods or other natural disasters.

Types

Many forms of latrine technology have been used, from very simple to more complex. The more sophisticated the system, the more likely that the term "toilet" is used instead of "latrine".

Pit latrine

A pit latrine is a simple and inexpensive toilet, minimally defined as a hole (pit) in the ground. More sophisticated pit latrines may include a floor plate, or ventilation to reduce odor and fly and mosquito breeding (called ventilated improved pit latrine or "VIP latrine"). Many military units, if intended for extended use, place basic shelters and seating over the pits. A pit is typically sited well away from any water sources to minimize possible contamination. After prolonged use, a pit is typically buried. Other types of pit latrines may include the Reed Odourless Earth Closet, the arborloo or treebog (very simple types of composting toilet), or the twin pit pour-flush pit latrine, popularized by Sulabh International. The shelter that covers such a pit latrine is known in some varieties of English as an outhouse.

Trench latrine In a location without longer term sanitation infrastructure, such as for emergency sanitation, a trench latrine is a workable solution. It typically consists of a pit or a trench in the ground, 4 to 5 feet (1.2 to 1.5 m) deep and 4 to 20 feet (1.2 to 6.1 m) long.

Slit-trench latrine A slit-trench latrine consists of a relatively shallow trench which is narrow enough to stand with one leg on either side (see defecation postures). This type of latrine is used either by squatting, with the users' legs straddling the pit, or by various arrangements for sitting or leaning against a support structure. Such support may be simply a log, plank, branch or similar arrangement placed at right angles to the long axis of the pit. This type of latrine is not commonly found in developing countries, but can be used for emergency sanitation.

Shallow-trench latrine The shallow-trench latrine is similar to the slit-trench latrine but is wider (20–30 cm or 7.9–11.8 in wide) than the latter. It is also shallow, with a depth of about 15 cm (5.9 in). This type of latrine is often used in the initial phases of emergencies and is a simple improvement on open defecation fields. A rule of thumb in emergency sanitation provision is to allow 0.25 m2 (2.7 sq ft) of land per person per day. This means 2,500 m2 (27,000 sq ft) per 10,000 people per day, or nearly two hectares per week. Men's and women's areas should always be separated.

Aqua privy An aqua privy is essentially a small septic tank located directly below a dry toilet squatting pan or bowl which has a drop pipe extending below the liquid level in the tank to form a simple water seal to minimise odors.

Most basic Campers refer to a cathole – a one-use, shallow scrape. Bucket

Illustrations

Worked examples

Example 1 — a first encounter with Latrine

Start with the simplest possible case. Write down what Latrine 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 Latrine 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 Latrine 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 Latrine

In research: Latrine 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 Latrine 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: Latrine is common in secondary-school and first-year university syllabi. It links to neighbouring topics Appropriate technology, Sanitation, Toilets, so understanding it makes those chapters shorter.
In everyday life: Look for Latrine 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 Latrine in 20 minutes

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

Frequently asked questions

What is Latrine in simple terms?

Why does Latrine 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 Latrine?

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 Latrine.