science

Reed Odourless Earth Closet

Reed Odourless Earth Closet 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 Reed Odourless Earth Closet rather than just read about it. In short: The Reed odourless earth closet (ROEC) is a variation on the ventilated improved pit (VIP) toilet where the pit is fully off-set from the Outhouse and is connected to the squatting plate by a curved chute. The ROEC is fitted with a vent pipe to control odour and insect nuisance.

Key takeaways

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

Reference excerpt

The Reed odourless earth closet (ROEC) is a variation on the ventilated improved pit (VIP) toilet where the pit is fully off-set from the Outhouse and is connected to the squatting plate by a curved chute. The ROEC is fitted with a vent pipe to control odour and insect nuisance. It is claimed that the chute, in conjunction with the ventilation stack, encourages vigorous air circulation down the toilet, thereby removing odours and discouraging flies. This type of latrine is common in southern Africa.

Design consideration for ROEC

Design life Most likely 4 to 15 years but the design life should be as long as possible: at least 10 years is desirable. The longer the design life, the longer the interval between relocating or emptying the latrine.

Dimensions Usually the pit cross-sectional area should not be more than 2 m2 in order to avoid cover spans with large spans. In practice, a ROEC serving one household commonly has a diameter of 1–1.5 m or in case of square or rectangular pits, a width of 1–1.5 m.

Vent pipe Vent pipe of a wide variety of materials are used, for example polyvinyl chloride (PVC), unplasticized PVC, bricks, etc. Whatever material is used, durability (including corrosion resistance), availability, cost and ease of construction are important factors. The vent pipe is sufficiently long such that the roof does not interfere with the action of wind across the top of the vent pipe. For both flat and sloped roofs, the top of the vent pipe should be at least 500 mm higher than highest point of the roof. The internal diameter of the vent pipe depends on the required venting velocity necessary to achieve the recommended ventilation rate of at least 20 m3/h. This in turn depends on factors like internal surface roughness of the pipe, its length (which determines the friction losses), the head loss through the flyscreen and wind direction.

Flyscreen specification The purpose of the flyscreen is to prevent passage of flies and mosquitoes; therefore, the mesh is not larger than 1.2 mm × 1.5 mm. The flyscreen is made of corrosion-resistant material that is able to withstand intense rainfall, high temperature and strong sunlight. Stainless steel screens are preferred.

Advantages As the pit is offset from the squatting hole excreta will not be seen, thus convenient to the users.

References Ahmed, M.F. & Rahman, M.M. (2003). Water Supply & Sanitation: Rural and Low Income Urban Communities (2nd ed.). ITN-Bangladesh. ISBN 984-31-0936-8.{{cite book}}: CS1 maint: multiple names: authors list (link) Workshop on community management of waste water (treatment and disposal)

Worked examples

Example 1 — a first encounter with Reed Odourless Earth Closet

Start with the simplest possible case. Write down what Reed Odourless Earth Closet 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 Reed Odourless Earth Closet 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 Reed Odourless Earth Closet 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 Reed Odourless Earth Closet

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

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

Frequently asked questions

What is Reed Odourless Earth Closet in simple terms?

Why does Reed Odourless Earth Closet 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 Reed Odourless Earth Closet?

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 Reed Odourless Earth Closet.