This historic diagram, which had been digitally enhanced and colorized, depicted a cross-sectional representation of a properly constructed 'flowing' well that was being used as a farm's potable water supply. The pipe was sunk far into the ground allowing for maximum natural filtration offered by the surrounding rocks, sand, and gravel. The end of the pipe was protected against damage, while any water overflow was directed through a drain away from the water source. The receptacle used for capturing the water never touched the sources, thereby, reducing the chances for contamination.
CDC/ Minnesota Department of Health, R.N. Barr Library; Librarians Melissa Rethlefsen and Marie Jones
November 20, 2012
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