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fermer ce livreA Guide to the Development of on-site Sanitation (WHO; 1992; 246 pages)
Afficher le documentPreface
ouvrir ce répertoire et afficher son contenuPart I. Foundations of sanitary practice
fermer ce répertoirePart II. Detailed design, construction, operation and maintenance
ouvrir ce répertoire et afficher son contenuChapter 5. Technical factors affecting excreta disposal
fermer ce répertoireChapter 6. Operation and maintenance of on-site sanitation
Afficher le documentPit latrines
Afficher le documentSimple pit latrines
Afficher le documentVentilated pit latrines
Afficher le documentVentilated double-pit latrines
Afficher le documentPour-flush latrines
Afficher le documentOffset pour-flush latrines
Afficher le documentDouble-pit offset pour-flush latrines
Afficher le documentRaised pit latrines
Afficher le documentBorehole latrines
Afficher le documentSeptic tanks
Afficher le documentAqua-privies
Afficher le documentDisposal of effluent from septic tanks and aqua-privies
Afficher le documentComposting latrines
Afficher le documentMultiple latrines
Afficher le documentOther latrines
ouvrir ce répertoire et afficher son contenuChapter 7. Components and construction of latrines
ouvrir ce répertoire et afficher son contenuChapter. 8 Design examples
ouvrir ce répertoire et afficher son contenuPart III. Planning and development of on-site sanitation projects
Afficher le documentReferences
Afficher le documentSelected further reading
Afficher le documentGlossary of terms used in this book
Afficher le documentAnnex 1. Reuse of excreta
Afficher le documentAnnex 2. Sullage
Afficher le documentAnnex 3. Reviewers
Afficher le documentSelected WHO publications of related interest
Afficher le documentBack Cover

Borehole latrines

Borehole latrines have an augered hole instead of a dug pit and may be sunk to a depth of 10 m or more, although a depth of 4-6 m is usual. Augered holes, 300-500 mm in diameter, may be dug quickly by hand or machine in areas where the soil is firm, stable and free from rocks or large stones. While a small diameter is easier to bore, the life of the pit is very short. For example a 300-mm hole 5 m deep will serve a family of five people for about two years.

The small diameter of the hole increases the likelihood of blockage, and the depth of the augered hole increases the danger of groundwater contamination. Even if the hole does not become blocked, the sides of the hole become soiled near the top, making fly infestation probable. However, borehole latrines are convenient for emergency or short-term use, because they can be prepared rapidly in great numbers, and light portable slabs may be used.

The holes should be lined for at least the top half-metre or so with an impervious material such as concrete or baked clay. Because of the small diameter and short life, the full depth is not usually lined.

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