Rural Hygiene Part 9

It is common for small slaughter-houses to be built on the side of a stream, so that the offal, carrion, and refuse of the place may be carried off without effort on the part of the owner, and there are a number of such places where brooks, used as places of deposit for slaughter-house refuse, discharge directly into the reservoirs of water works.

But this sort of animal refuse is not the most serious pollution. The leachings and washings from privies and cesspools, carrying, as they do, germs of contagious diseases, are most to be dreaded, and when a privy (with no vault underneath) is built on the side of a steep ravine and is so located that the natural drainage of the sidehill on which it is built cannot help but run around and through the building, then the pollution of the stream in the gulley is not only direct and inevitable, but of a deadly sort (see Fig. 36). Fortunately, the germs thus carried into the stream suffer the vicissitudes of all life exposed to the attacks of hostile forces.

At the time of freshets the streams carry mud in abundance, which mud is continually settling out of the water as opportunity offers, and with this settlement of mud there occurs also the settlement of the germs.

Also the pathogenic or disease-producing germs are usually weaker and more susceptible than the putrefactive and other organisms which are found in the water in great abundance after any rain storm, and which tend to inhibit or destroy the pathogenic germs. But some will survive, and, with favoring conditions, may pa.s.s through the water-pipe to the house, causing sickness, if not death.

[Ill.u.s.tration: FIG. 36.--Stream draining a privy.]

Any inspection of the watershed, therefore, should look to the elimination of the dangers above described, and to the location of barns and barnyards, pig-pens and poultry yards, privies and cesspools, so that no direct drainage into the stream shall be possible.

It is out of the question for any surface water-supply to be pure, since the mere fact of the pa.s.sage of water over the soil inevitably results in the collection of organic matter; and it is no exaggeration to say that the time will inevitably come in this country, as it has already in Germany, when no surface supply will be considered satisfactory unless the water is filtered. The only alternative is water gathered from areas that are owned by the individual and on which, therefore, all dwellings may be prohibited, all cultivated land avoided, and where the primeval forest may be restored, making the watershed equal to that from which forest streams emerge.

But usually, in the case of a single house, it will not be possible entirely to eliminate the dangers of surface pollution, although an inspection will show the dangers, and possibly some of them may be avoided. Certainly any direct drainage into the streams should be cut out, as well as the drainage from barnyards in the immediate vicinity of the point where the water is taken out. Just what percentage of pollution may be eliminated in this way it is impossible to determine, but it is not too much to say that no brook or pond should be used for a water-supply of a house unless _every known pollution_ of an organic nature has been removed. Under the most favorable circ.u.mstances there will be enough accidental contamination to make the water at times dangerous, and no added risks ought to be a.s.sumed.

In looking over a watershed the possibility of sewage entering the stream is, of all pollutions, the most to be avoided. To adequately investigate the quality of a stream, the inspector must satisfy himself as to the point of discharge of the sewer of every house on the watershed, and this must be done personally, without apparently reflecting on the statements of the owner of the house. If any such points of discharge are found, the sewage should be either diverted into some other watershed, or spread out over the ground away from the stream, or purified by some artificial treatment before discharge, or else the creek water cannot be used.

The next point to be noted in the source of the water-supply is the presence and location of privies. These nuisances should be as far back from the banks of the streams as possible to eliminate all danger since the surface of the ground always slopes toward some stream, and pollution may be carried for considerable distances over or through the soil. Water-tight boxes can be provided so that no possible pollution of the surface-wash can occur, and if periodically the contents of these boxes be hauled away and buried, the privy loses its dangerous character. The city of Syracuse has installed on the watershed of Skaneateles Lake a most admirable system of collection of privy wastes, and the lake water is thoroughly protected, although there are several hundred privies on the watershed.

Cesspools, in general, are not dangerous if they are located fifty feet or more from the stream and if no overflow occurs.

Barnyards ought not to drain directly into streams, but when, as in so many cases, the stream flows through the barnyard, the only remedy is to move either the stream or the barnyard, and it is difficult to persuade even a well-disposed neighbor to do either. It is sometimes possible to appeal to his sense of right; but, too often, the neighbor feels that it is his land, his barn, his drain, even his brook, and he will do whatever he pleases with them, whether the water further down stream is to be used for drinking purposes or not. The question resolves itself into an inspection of the watershed and a determination of the existing conditions. If those are tolerable, the water may be used. If evident contamination is present, the water must usually be given up, and some other source of supply sought.

_Well water._

The pollution of wells, if it exists at all, is usually very p.r.o.nounced, and it is probably safe to say that, except where buildings, drains, or cesspools have been crowded too close to wells, or where some manifest and gross cause of pollution exists, a well water is safe to drink.

To protect properly a well from gross pollution, two precautions should be observed. The wall of the well should be built up in water-tight masonry, so that surface wash cannot enter the well except at a depth of at least six feet, and second, this water-tight masonry should be carried above the surface of the ground at least six inches and the well then covered with a water-tight floor so that no foreign matter can drop through the floor into the well or can be washed in by the waste water from the pump (see Figs. 28, 29, 30). If these precautions are taken, it is safe to say that nine tenths of the pollution occurring in isolated wells would be stopped.

Besides the above, a well may be polluted by a stream of underground water washing the contaminating matter through the soil. Experiments have been made to show this very plainly. A large number of bacteria were placed six feet below the surface just in the top of the underground stream of water. Within a week they were found in considerable numbers in the water of the soil one hundred feet distant, but when the same number of bacteria were placed in the soil four feet below the surface above the level of the ground water, none of them found their way into the water of the soil. This experiment shows the folly of building a cesspool in the vicinity of a well when they both go down to the same water level, since the contents of the cesspool will be carried into the well if the underground stream flows in the proper direction. A shallow cesspool, however, would not be open to the same objection.

It is always difficult to detect the direction or flow of underground water, and various technical and delicate methods have been selected to make this determination. A very simple test, however, is to dig a hole at the point where pollution is suspected, carrying the hole down to where ground water is reached, and then to throw a gallon of kerosene oil into the hole, and if the ground-water flow is toward the well, the presence of kerosene in the well water will make the fact known. This would not, however, prove that the actual contamination would produce disease, since a liquid like kerosene can find its way through the pores of the soil to much greater distances than bacteria can be carried. But, to be on the safe side, water from such a well should not be used.

To make sure of the quality of the water proposed for a water-supply, it is wise to have such water examined by a chemist. The chemist will make certain determinations of ammonia and other chemical combinations, and will report his findings with an interpretation or explanation of the result. What he finds is not the presence or absence of disease or disease germs, but substances that suggest or involve the presence of organic pollution. A test is made for the number of bacteria, and a well of spring water which contains more than about fifty in a cubic centimeter is a suspicious water. Surface water, on the other hand, may contain two or three hundred without being necessarily bad, the types of bacteria being harmless. Generally, a chemist will also determine the presence of the colon bacillus which is found in the intestinal tract of man or warm-blooded animals. Wherever this is found, in even such a small quant.i.ty as one cubic centimeter of water or less, there is strong presumption that the water has been polluted by human wastes and is therefore not fit to drink.

_Dangers of polluted water._

Since no evidence of the danger of drinking polluted water can be so graphically expressed as by a direct reference to epidemics caused by the unwise use of such water, it will not be out of place to refer briefly to some of the instances in which a direct connection has been traced between a specific pollution of a certain water and disease or death resulting from it.

Although, as has already been explained, an infected water causes various kinds of intestinal disorders, particularly among children, the most characteristic evidence of pollution occurs when the noxious material comes directly from a typhoid fever patient, so that this same disease can be recognized as transmitted to another individual or family. This transmission of typhoid fever, while in some cases very plainly due to other agencies than water, as, for example, milk, oysters, and flies, yet, by far the largest proportion of the transmitted cases comes through the agency of polluted drinking water, and there are many examples both of contaminated wells and streams which emphasize this possibility beyond all question.

Two historic investigations of epidemics which have thoroughly convinced sanitarians that typhoid fever is a communicable disease and that water is the vehicle for its transmission may be briefly cited.

In 1879 Dr. Thorne reported an epidemic in the town of Caterham, England, which he had investigated, and disclosed the following facts: The population of the village was 5800. The first case of fever appeared on January 19. Others followed in rapid succession, until the number reached 352, of whom in due time 21 died.

The possibility of infection was carefully looked into. The influence of sewer air was ruled out because there were no sewers. The milk supply was proved un.o.bjectionable. No theory of personal or secondary infection could account for the widespread prevalence, particularly as only one isolated case had occurred during the preceding year, and this had been imported.

Of the first 47 persons attacked, 45 lived in houses supplied with the public water-supply, and the other two were during the day in houses supplied with public water. Further, in the Caterham Asylum, with nearly 2000 patients, not a single case appeared, their water coming from driven wells. Investigation of the water-supply showed the undoubted cause of the epidemic. The public water-supply was derived from three deep wells, connected by tunnels in the chalk. In one of these tunnels, from January 5 to the end of the month, a laborer worked, who, though unattended by a physician, was evidently suffering from mild typhoid fever, the symptoms of the disease being carefully detailed by Dr.

Thorne. The laborer at the time of his going to work had a severe diarrhoea, and while in the tunnel was obliged to make use of the bucket, in which the excavated chalk was hauled to the top. He admitted that at times the bucket, in being hauled up, would oscillate in such a way as to spill part of its contents and thereby pollute the water of the well below. Two weeks from this accidental pollution the epidemic began, and there can be little doubt of the relation of this mild case of typhoid to the epidemic which followed.

A second ill.u.s.tration may be cited at Butler, Pennsylvania, which occurred in 1903. The water-supply of Butler, a borough of 16,000 people, comes from a reservoir on the creek which flows through the phase. On account of the gross pollution of the water at the pumping-station, a long supply pipe has been laid from the reservoir directly to the pumps. The water also was filtered through a filter of the mechanical type. Through some accident the filter was thrown out of service for eleven days, between October 20 and 31, 1903, and unfortunately, on account of the failure of the reservoir dam, the water was at that time being taken directly from the creek at the pump well, and had been since August 27. Only ten days after the filter was shut down, the epidemic broke out in all parts of the town. Between November 10 and December 19 there were 1270 cases and 56 deaths. In the subsequent investigation it developed that not only was the stream generally polluted by the sewage at various points above the intake, but that there had been several cases of typhoid fever on the watershed, some on a brook that enters the creek within one hundred feet of the filter plant. As at Caterham, the inference is patent that the introduction of some specific infection into the drinking water was the direct cause of the general epidemic.

The occasional outbreaks of typhoid fever which occur in single families are not so easy to explain, particularly since the small number of persons affected does not usually call for a widespread interest on the part of those experienced in such epidemics. In the Twenty-seventh Annual Report of the New York State Department of Health, the following description of an outbreak in a small hamlet, where the cause seems to have been the use of a pond for a wash tub by some Italian laborers, thereby transmitting the disease germs from their clothes to the water afterwards used in a creamery, is given. The diagram, Fig. 37, shows that the creamery secured its water for the purpose of washing cans from a small pond by means of a gravity pipe line. The foreman of the creamery, who boarded at the residence marked _A_, first contracted typhoid fever. A week later an employee at the creamery also contracted the fever, the residence of the latter being marked _B_ on the diagram.

About six weeks later the railroad station agent, living at the point marked _C_, contracted the fever, and two weeks later his wife was attacked with the same disease. The residences at _B_ and _C_ are only about three hundred feet apart, both families taking their water-supplies from a spring between the two, but nearer _B_. During the summer previous to this outbreak a gang of Italian laborers, engaged in double-tracking the Central New England Railroad, were housed in box cars standing on one track of the railroad. One of the members of the gang was reported to have been taken ill with a fever and was at once removed, it was supposed, to a hospital in New York. It was the practice of the Italian laborers to bathe and wash their clothes in the upper of the two ponds from which water is supplied to the creamery by the pipe line. All the persons who contracted the fever were supplied with milk from the creamery. The foreman, who was the first to contract the fever, used water from the creamery and from the well at the house where he boarded. The other families, as already mentioned, used water from the spring. The conclusions, therefore, are that the creamery in some way became infected with typhoid fever, probably through the water-supply from the pond, and that the first two cases were due directly to this cause; that the station agent and his wife contracted the fever because of the infection of the spring, either from some small stream which is the outlet of the ponds or from some infection due to the illness of the owner of the house _B_ near by. The report concludes as follows: "The use of water for creamery purposes from a pond exposed to such unwarranted and unchecked pollution as is shown here, or the permitted abuse of a water-supply for a creamery, appears little less than criminal negligence on the part of those responsible for the management of the creamery."

[Ill.u.s.tration: FIG. 37.--Contamination of a creamery from the water-supply.]

Another report in this volume of the New York State Department of Health ill.u.s.trates very well how a spring or well may be contaminated, and is taken from a report on an outbreak at Kerhonkson, Ulster County. The report reads as follows: "The village of Kerhonkson is built mainly on the side of a mountain of solid rock covered by a thin top soil of variable depth. Owing to its rocky nature, only one or two wells exist throughout the whole place; such a thing as a drilled well has never been seriously considered.

"The inhabitants obtain their drinking water from a well on the property adjacent to and above the present school building, and known as the "Brown" well, and from a clear spring at the bottom of the hill in the rear of the village store and known all over the region as the Loundsbury spring.

"The school building is an old-fashioned two-story ramshackle affair with overhanging eaves, especially designed to obstruct light and darken the upper schoolroom. The building is in the center of a pine grove 250 150 feet in size, which also obstructs the light and tends to dampen the building. At the extreme ends of this school lot are two privies for the boys and girls, built on loose stone foundations, innocent of mortar or cement, which allows the water in heavy storms to wash out the fecal contents of from nearly a hundred pupils down upon the habitations below. Were the wells existing in the village as carelessly constructed as the Brown well and the various privy vaults which I have inspected, the loss of life from typhoid fever would be terrible indeed.

"Obtaining the names of all the patients who had suffered from this disease, I found that all but three were Kerhonkson public school pupils, and all had drunk the water of the before-mentioned well on the Brown property. Two out of these three cases were mothers of pupils who had been stricken with the fever and who had nursed the children through their long and exhausting illnesses and afterward had been attacked by the disease themselves, while the third and remaining case was a puzzler. This boy had never been a pupil of the school in question, nor had he partaken of any of the water of the suspected well. He was a pupil of another school entirely and lived in an adjoining village a considerable distance away. A special visit to him, however, developed the fact that some time before his illness he had come to the village store in Kerhonkson to purchase goods and had drunk water from the Loundsbury spring.

"Two years ago two cases died of typhoid fever on the property on which the Brown well is situated. Their stools were treated with lime and buried on the hill behind the house. Three cases of the same fever have occurred in the same house this season. The well in question is laid up with stone and cement and was supposed to be tight and impervious to surface water contamination. Investigation, however, proved that there were openings in the stone work in the side toward the privy. On examining the privy it was found that the foundation was composed of loose stones without cement or mortar that would readily allow the fecal contents to be washed down toward the well, the privy being about three feet higher than the well, the natural descent of the land being about one foot in twenty-five, the distance between privy and well being only about eighty feet. Another factor favoring the well contamination from this privy is that any filth washed downward from the privy toward the well would be stopped by the wall of the house proper and carried directly toward the well which lies close to the southeast corner of the house. Thus all of the conditions point to privy contamination of this well which should be at once cemented up on the inside, thoroughly cleansed and purified, before its use should be permitted, while all the privies in question should be provided with vaults of brick eight inches thick with eight-inch brick floors all laid with cement, and their inside surfaces lined with cement at least one inch thick, to prevent any further possible contamination."

In view of the imminent danger always possible wherever human wastes are directly discharged into streams, whether from privies or sewers, it is obvious that water so contaminated should never on any account be used as drinking water. It does not follow, because a stream so contaminated has been used for months or years without producing any evidence of disease, that the water is safe. Unless an excessive amount of organic matter is so transmitted, no evidence will be found that such pollution has existed through any outbreak of disease. But if once the discharges become affected through a person having typhoid fever, then the result of the infection is apparent immediately. If, therefore, an inspection of the stream above the point where it is proposed to take the water-supply shows the existence of privies, as shown by Fig. 36, the water should not be used for domestic supply, although a number of individuals may have been using the water for years without bad effects.

It is a case in which prevention is much wiser than cure, and while economy and convenience may indicate such a polluted stream to be a desirable source of supply, a proper regard for health conditions will rule it out absolutely.

CHAPTER VIII

_WATER-WORKS CONSTRUCTION_

Construction methods and practices which lend themselves to the development of the water-supply for an individual house may be divided into three parts, namely:--

(1) Construction at the point of collection, whether this point be a well, spring, brook, or reservoir;

(2) The pipe line leading from the collection point to the buildings;

(3) Constructions involved in the house, other than the plumbing fixtures.

Taking up these different points in order, we may note at the outset that it is possible to employ either very simple or very complicated construction.

_Methods of collection of water._

The common method is to lay a galvanized iron pipe in a ditch as far as a spring and there to protect the end of the pipe with a sieve or a grating and to leave it exposed in the water with no efforts expended on the spring itself. In a brook with waterfalls or with good slope, it is not uncommon to project a large pipe or a wooden trough into the stream at the top of a waterfall and so carry a certain amount of the water into a tub or basins from which the small pipe leads to the house. On the sh.o.r.es of a lake or pond the galvanized iron pipe is laid out on the bottom of the lake with the end protected by a strainer.

In all these cases the simplest method is the best, provided the supply of water is not needed in the winter; but such simple methods as just described fail when frost locks up the surface flow of the stream. Then the pipe throughout its entire length must be in a trench below the frost line at the entrance to the spring as elsewhere. To permit this, the spring must also be deep, or else so inclosed that the pipe leading into the spring can be covered by earth banked up against it. Not long ago the writer saw a pipe taking water from a small lake recently improved by a stone wall. Instead of conveying the water-pipe down under the wall the unwise stone mason had built the wall around the pipe and the pipe line was frozen up through the entire winter following.

Such simple methods also fail when the supply of water is not adequate, since, in order to secure a large quant.i.ty from a stream whose flow is periodic and irregular, some storage must be provided, and storage usually requires more or less elaborate construction work at the reservoir. Another reason for more elaborate construction at a spring is to prevent surface contamination, and it is always desirable to roof over a spring in order to protect it from surface flows. The writer has seen, as an example of objectionable construction, a spring in the bottom of a ravine or gully down which, in time of rain, torrents of water pa.s.sed, although in a dry season the spring was the only sign of water in the vicinity. It could not but happen that this torrent of water, which carried all kinds of pollution from the road above, practically washed through the spring, destroying its good quality. In such a case, another channel for the gulley water ought to have been made, or else the spring dug out and roofed over, so that the torrential water could pa.s.s above it.

In other cases, the spring is found at the lowest point in a general depression, so that, while no stream pa.s.ses through the spring, the spring is a catch-all for the surface drainage in the vicinity. In such cases the water should be protected by a bank of earth around the spring, behind which the drainage should be led off through a special pipe line if necessary.

_Spring reservoirs._