...deep. If shallow dug wells arenecftsary, they should be constructed with water-tight walls ext ending as far as practicable into the well and also a short distance above groundThe floor or curbing should be water-tight, and pumps should be u?t : in preference to buckets...

...they should be constructed with water-tight casings extending down into the well as far as practicable and also a short distance above ground. The floor,...feet scrapings and similar dirt from getting into the water by way of the top of the well. Underground water is not only less likely to become contaminated...

...they should be constructed with watertight casings extending down into the well as far as practicable and also a short distance above ground. The floor,...feet scrapings and similar dirt from getting into the water by way of the top of the well. Underground water is not only less likely to become contaminated...

...If shallow dug wells are necessary they should be constructed with watertight casings extending down as far as practicable into the well and also a short...feet scrapings and similar dirt from getting into the water by way of the top of the well. Underground water is not only less likely to become contaminated...

...open dug wells and the pits constructed as reservoirs around the tops of many casings are frequently exposed to fecal contamination from above or through...water is not only less likely to become contaminated if protected from surface washings, air, and light, but it keeps better and is less likely to develop...

...shallow dug wells are necessary they should be constructed with water-tight casings extending down as far as practicable into the well and also a short...feet scrapings and similar dirt from getting into the water by way of the top of the well. Underground water is not only less likely to become contaminated...

...so as to allow pollution to enter. As a matter of ordinary precaution the ground should be kept dean and water should not be allowed to become foul or...scrapings and similar dirt from getting into the well. Ground water is not only less likely to become contaminated when protected from surface washings, air,...

...matter how deep. If shallow dug wells are necessary, they should be constructed with water-tight casings extending as far as practicable into the well and...scrapings a'nd similar dirt from getting into the water by way of the top of the well. Underground water is not only less likely to become contaminated...

...matter how deep. If shallow dug wells are necessaiy. they should be constructed with water-tight casings extending as far as practicable into the well and...feet scrapings and similar dirt from getting into the water by way of the top of the well. Underground water is not only less likely to become contaminated...