. Special bulletin. e construction as shown prevents pollution by surfacedrainage and by infiltration. The contamination from thesources shown cannot pass to the well directly but mustfilter through a considerable layer of soil before passinginto the underground water supply. Filtration through aconsiderable layer of soil is a purifying process. However,an undue burden should not be placed on the filtering medi-um. Hence, excreta in the privy should not come in directcontact with the soil. The figure shows a fly proof recepta-cle privy. The type of privy shown can be classed as sani-tary. The
. Special bulletin. e construction as shown prevents pollution by surfacedrainage and by infiltration. The contamination from thesources shown cannot pass to the well directly but mustfilter through a considerable layer of soil before passinginto the underground water supply. Filtration through aconsiderable layer of soil is a purifying process. However,an undue burden should not be placed on the filtering medi-um. Hence, excreta in the privy should not come in directcontact with the soil. The figure shows a fly proof recepta-cle privy. The type of privy shown can be classed as sani-tary. The open pit privy cannot be recommended as a safemeans of disposal of excreta, and must be classed as insani-tary. The well is properly located on high ground above thebarnyard and privy. This prevents pollution of the well bysurface drainage. Figure 2 illustrates an improperly located and construct-ed dug well and a very insanitary privy. The well site is ona ground lower than the barnyard and privy. Surface drain- 11. O 12specialbulletin30mont
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Keywords: ., bookcentury1900, bookdecade1910, booksubjectpublich, bookyear1914
