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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
ouvrir ce répertoire et afficher son contenuChapter 6. Operation and maintenance of on-site sanitation
fermer ce répertoireChapter 7. Components and construction of latrines
Afficher le documentPits
Afficher le documentLatrine floors
Afficher le documentSlabs
Afficher le documentFootrests and squat holes
Afficher le documentSeats for latrines
Afficher le documentWater seals and pans
Afficher le documentVent pipes
Afficher le documentSuperstructure
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
 

Footrests and squat holes

Footrests are required to lift the users' feet off the slab in case it is already fouled and also to position the users so that they are less likely to dirty the slab or the edge of the squat hole. The positions and sizes of footrests must be determined to suit the needs of the people in each area. Fig. 7.24 indicates a typical layout. Different people in different societies with different-sized bodies and varying flexibility of tendons may excrete between their feet or behind their ankles. Their feet may be parallel or angled. It is therefore advisable to check with young and old, and with male and female in a community before assuming a particular layout. McClelland & Ward (1976) reported that in one sample of 140 people, the distance from heel to anus in a squatting adult varied from 0 to 0.25 m with a mean of 0.13 m for men and 0.10 m for women.


Fig. 7.24. Possible footrest positions

 

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Excreta enter a pit either by falling through a squat hole or by passing through a water seal. Details of seals are given later. Squat holes have to be large enough to limit fouling of the edges but not so large that children are frightened of using the latrine. The hole can either be rectangular, elliptical, pear-shaped or circular with a straight extension as in a keyhole (Fig. 7.25). The maximum width should be 180 mm and the length at least 350 mm. In a concrete slab, the edge of the former used to make the hole should be angled to ease its withdrawal after casting.


Fig. 7.25. Squat hole shapes and former (Different shapes for squat holes)

 

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Fig. 7.25. Squat hole shapes and former (Plan)

 

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Fig. 7.25. Squat hole shapes and former (Elevation)

 

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