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|Middle Atlantic States||Pennsylvania||Philadelphia||1798 Proposal|
Printed by Order of the Corporation of Philadelphia.
"Agreeably to your request, I now submit to you my ideas upon the objects which you have communicated to me for consideration:
I. To supply the city of Philadelphia with a sufficiency of wholesome water for culinary purposes;
II. To introduce an additional supply of water for the purpose of washing the streets and, if possible, of cooling the air of the city.
The season and the weather are at present both unfavorable to an investigation of all the circumstances, which may affect a measure of so much importance; and indeed the time allotted to me has been so short, that it cannot be expected that my opinion should extend far into the minutiae of estimate and execution; I have however, endeavored to establish general principles, which cannot be affected by any variations of details, and to which every attempt will be made to accomplish your object must be made to bend.
The indispensible requisites, of every work which may be executed, appear to me to be the following. Indeed so indispensable do I consider them, that every proposal in which they do not meet, ought, I think, to be at once rejected. Their importance is in the order in which I have arranged them.
I. The works must be in full operation before the end of July 1799.
II. They must be certain in their effects, and permanent in their construction.
III. They must not be liable to interruption from ice or freshes, but be equally useful in the severest winter and in the wettest summer.
Having maturely considered all the schemes, which I have seen published, or have heard mention in conversation, I shall proceed to state to you, what appear to me to be the only means of concentring all these requisites in one work; and, having laid before you what I propose to accomplish, with the means, and the probable expence of effecting it, I will then give you my reasons for rejecting every other proposal.
The nearest waters to the center of the City of Philadelphia are those the Delaware and Schuylkill. I conceive them both to be wholesome, reasons which I will mention in a postscript, in order that I may not interrupt the consideration of the principal object.
It is evident that the exertions of only seven months cannot bring water from a greater distance.
In choosing between the waters of Delaware and Schuylkill, the following considerations occur:
I. In favour of the Delaware: it is true that works erected upon the margin of the river would supply water the city immediately, from the river upwards, and save all the expence, which must, in the other case, be incurred between the Schuylkill and center square.
II. Against the Delaware will operate the impurity of its water, which is subject to a strong running flood tide, which must be supposed to be contaminated by the decayed vegetables marshes over which it passes, independently of the filth thrown from the numerous vessels lying along the wharves or running into it from the public sewers.
III. In favour of the Schuylkill: the principal circumstance is the uncommon purity of its water; its bed is every where narrow and rocky, its sources lie entirely in the lime-stone country, and the tide opposite the center of the town does little more than raise the water by accumulation.
IV. On the other side: the extraordinary expence of works from the banks to center square may be alleged.
I believe, however, that you agree with me in thinking that, as difference of expence on the largest estimate cannot exceed thirty thousand dollars, there ought not to be a moment's hesitation in preferring Schuylkill. I shall therefore confine my remarks to that river.
Neither the waters of the Delaware, nor of the Schuylkill can become useful unless they be raised to an elevated level, commanding every part of city. To do this, in sufficient quantity, very powerful machinery will be required; and I am very certain that human ingenuity has not hitherto invented anything capable of producing the proposed effect with constancy, certainty and adequate force, excepting the Steam-engine.
Taking therefore all the proceeding principles for granted, I submit to you the two following proposals, which are in effect the same; and the choice between them must depend on the practicability of the first.
N.B. The distribution of the water over the city being the same under every scheme that may be adopted, I shall postpone its consideration to the last.
The objects which I propose to accomplish are:
I. To raise a reservoir in center square. It is not sufficient that this elevated so high that it will discharge its water into the distributing pipes: I think it should be forty feet above the level of the pavement, in order that the pressure of the water, in so elevated a head, may not only propel it to every part of the city, but throw it up in fountains in every street, wherever it may be required.
II. To bring to the reservoir the waters of the Schuylkill.
III. To raise them into the reservoir.
A culvert, or tunnel, six feet diameter, carried under ground, the bottom of which should be level with the bed of the Schuylkill, would bring the water into a reservoir in center square, at the depth of about forty feet. I am not perfectly informed of the levels, but ten feet more or less, would affect the expence very inconsiderably. Over or near this reservoir, which ought to be a cylindrical well of at least twenty-five feet diameter, the Engine-house should be erected. It may, at the same expence that would render it useful, be made an ornamental building. Upon the top of the Engine-house should be the reservoir. With the reservoir all the distributing pipes are to be connected. The engine will keep it perpetually full, being of a power sufficient to supply every possible demand of city.
There is, however, a
circumstance which may render the scheme impracticable, or at all events
unadvisable. It is this. The gravel stratum, to which all the
wells of this city are sunk, seems to be nearly on a level with the waters
of the adjoining rivers, and to be supplied by them with that
inexhaustible quantity of water for which it is remarkable.* Should it so
happen, as it believe it will, that the tunnel lay near, or in, this
stratum, it will be difficult, if not impossible to keep the work
sufficiency dry; and I doubt, whether at any rate workmen could be induced
to labor in this subterraneous situation, which will always be wet, and
the safety of which may depend on the certainty of working the pumps
above. I shall therefore make another proposal, which is liable to
no inconvenience in the execution, but which, though not more expensive at
first, will, as it requires two engines, be liable to more annual
*The perfect permeability the stratum is evident from the connection of the wells with each other, and with the sinks and privies, from whence arises the extreme unpleasantness of the water in the crowded parts of the city. It is worth considering whether the pumps do not act as chimnies to bring up volumes of noxious gas from the putrifying water, which may predispose the inhabitants to receive the yellow fever.
II. A reservoir being
made made on the banks of the Schuylkill, an engine will throw up a
sufficient quantity of water into a tunnel, carried from thence to a
reservoir in Center Square. This tunnel should be sunk so low that three
feet of earth may cover it in its whole length. The reservoir in Center
Square would be sufficiently elevated to supply all the streets from Water
Street to Fourth or Fifth Street with water for culinary uses. To supply
the rest and to raise fountains for the purpose of washing the streets, a
smaller engine would still be necessary.
It is very evident that, in either of these proposals, the three requisites meet: the supply of water would be inexhaustible; the work might be accomplished in a few months; the ice would never obstruct the operations of the works, as the tunnel would be inaccessible to frost; and the power employed is that of which the amount and the effect depend not on the variable seasons, or on the natural advantages of situation, but solely on the option of man. In every species of machinery in which mechanical powers alone operate, the bulk, the friction and the unwieldiness of the works encrease nearly in proportion to the effect required; in the chemical operation of a Steam-engine, power is encreased in a ratio far outstripping the bulk and the price of the engine, and when the first expence is incurred, the two men that are necessary to attend the smallest, can manage the most gigantic mechanism. The expence would be 75,000 dollars.
Having accomplished this much of the proposed object, enough to substitute pure, for putrifying water, and effectually to provide for cleansing and cooling the streets, a very important part of it still remains unfinished, but which may be a work of more leisure. This is to bring to Philadelphia the spring which turns the mill, called Spring-mill, for the sole purpose supplying the city with water for cullinary use.
It has been generally supposed, and perhaps with great truth, that limestone water has a medicinal effect in bilious cases. The mill-springs form rivulet gushing from a limestone bason, and, as nearly as I could ascertain under all the disadvantages of the season and the want of instruments, would run through and fill a trunk from four to five feet in section, not calculating upon a head.
This quantity would give a perpetual supply to 2,880 pipes, the of which should be equal to one-fourth of an inch square, and supposing water were permitted to run only twelve hours each day, it would supply 5,760 houses with a quantity more than ten times their possible consumption. As the aqueduct, before it reached Philadelphia, would gain a very considerable head, the same supply would be received, but in less time. A more detailed calculation is at present un- necessary; this is enough to show the spring produces water in sufficient quantity.
The spring has never been known to increase in wet or to diminish in dry seasons. Its temperature is, as I am well informed, lower that that of most other springs, being only forty-two or forty-three degrees of Farenheit, and the water issues in such quantities that it maintains a warmth above the freezing point, in a course of three miles down the Schuylkill, keeping the river open for canoes in the severest winters. Even the winter of 1796 did not affect it. To the information which I received of this fact, from several most respectable men in the neighborhood, I can add that it was open as far as I could see it, on the twenty-seventh of this month, when ever other part of the river was frozen over.
The practicability of bringing this spring to the city is ascertained by the practicability of the canal, near the proposed bank on which it lies. Its level is four feet higher than that of the canal, it would go over better ground, the distance would be shorter, and it is to the south and eastward of all the rocky knolls. I have good reason to think that the distance would not exceed twelves miles.
In executing this work, only two objects of indispensible consideration occur.
I. To prevent the quantity of water from being diminished by evaporation or absorption.
II. To preserve its temperatures, both in summer and winter.
Both these ends would be attained, by conducting the water in a close tunnel (say an eliptical culvert of three feet by six feet) three feet a least under the surface of all the natural ground, provided with the necessary air-holes and air-traps, and carrying in it light aqueducts of segment arches across the vallies, affording every attempt at a forced canal of earth.
The expence of bringing the water as far as the city would not exceed 275,000 dollars.
It is evident, that in this work the water would never freeze, nor yet acquire any perceptible degree of heat. Only while passing along the aqueducts, it would lose, in winter, and gain heat, in summer.
But supposing even that the aqueducts amount to a mile in length, and that the course of the water be only two miles an hour, it would never be exposed to an atmosphere hotter or colder than itself, for more than thirty minutes. We have seen that it will retain a temperature above the freezing point for near three miles, though it has passed a mill, and it mixed with the colder waters of the Schuylkill. As the aqueduct would be in short lengths, the water would re-acquire in the tunnels, the temperature it might lose in the open air.
Should the mill-spring at any time be found insufficient, the aqueduct, once constructed, might receive, in its course, supplies from all the neighboring springs, which rise in levels sufficiently elevated; and perhaps convey water to the city, sufficient in quantity to render the Steam-engine on the Schuylkill unnecessary.
Even when the first supply arrives, the engines may be dormant, from the month of November to the beginning of August.
I have now to consider the works necessary in the city itself.
In the first instance, they will consist of wooden pipes of four inches bore, leading from center square in the following arrangement;
I. Four pipes down Market-street, supplying at their extremities, ranges of cross pipes of three inches bore, running north and south, in Water-street, Front-street, second and Third-street. These pipes will lie under or near the gutters. From them will branch laterally the leaden pipes which supply each house. The details of cocks, public spouts, fountains and fire plugs, would be particularly attended to. These four mains will be served from the bason in center-square, and they must be so connected, as at option to be served also from the reservoir upon the Engine-house.
II. Four pipes down Chesnut, and four down Arch-street, to supply the cross streets upon the same principle, as high as Eleventh-street. If no more could be accomplished in the first year, it would be sufficient, as the pumps above Eleventh-street furnish as yet very good water.
If time permits, before, and certainly after, these pipes are in operation, the east and west pipes must be doubled up so as to serve separately, one the north, the other the south streets. In the course of time, they ought to be replaced with cast iron pipes of nine inches bore.
This may be done gradually, beginning with the longest.
In all the pipes, plugs or cocks will be fixed which, when drawn, will throw up fountains playing to a hight proportionate to the elevation of the reservoir, the lower cock being previously closed. A main of four inches bore, for instance, will, when closed at the lower extremity, throw up, in different parts of the same street, twelve fountains of an inch diameter each, and thus the whole city may be alternately cleanded and cooled.
In case of fire, these fountains will fill the engines without manual labor, by the proper application of a hose. This is of itself an object worthy of the whole expense of distribution.
The pipes ought to lie at least two feet below the pavement. Wooden pipes require much attention and repair. I cannot in the short time allow me, furnish any probable calculation of the annual expense of these repairs. THe experience of the London new river company shows, that notwithstanding their frequency, the water can be supplied and all the works kept up at a small annual water-rent, reserving a very large income to the company.
Neither can the original expense of laying down the pipes be very exactly calculated, without better information that I have been able to procure. My enquiries however lead me to believe, that the pavement may be opened, the pipe manufactured and laid down, and covered again, for half a dollar a foot, allowing for plugs, cocks and hoops.
On this supposition, and allowing 10,000 feet of pipe (or nearly two miles) to Front-street, 8,000 feet to the three next, 5,000 each as high as Eleventh-street, and 35,000 in the east and west mains, the whole amount will be 104,000 feet, making 52,000 dollars.
This expence would distribute water through all the crouded parts of the city, and render the pumps wholly unnecessary. The expence, of laying the water by small leaden pipes from the main to the private houses, should be borne by the individuals. It would amount of fifty cents, per foot, and in no case exceed twenty-five or thirty dollars, an expence which I think every family would cheerfully incur to avoid the inconveniences arising from the necessity, at present, of sending their servants to the pumps. For these pipes, a rent would be paid. The poorer inhabitants would supply themselves from the public plugs, without any charge. I think half the expence of laying down the main pipes, i.e. twenty-five cents per foot, if assessed upon the city, would not be objected to. The rich would pay in proportion to their fronts, the poor would be slightly affected; the expence in fact would fall upon the landlord. Corner houses should pay only for one front. This assessment would pay the whole expence, one half being levied on each side of the street. If a tax is to be levied on the city for the work, a lighter and a juster could not perhaps be devised. It would be in fact the purchase money of health and convenience, and occur only once. Every new house, would pay its share, as it was built, and thereby contribute to future repair.
But I ought to apologize for these suggestions I have made them only to show, that the effort, which is proposed to make, is much within the powers of this wealthy city.
|Recapitulation of expence: |
|Erecting the Engines and bringing water from Schuylkill to Center-square,||75,000|
|Bringing the Mill-spring to the city,||275,000|
|Distributing the water throughout the city,- first expence,||52,000|
A further expence will be
necessary to extend the distribution to every distant part of the
town. This may be executed in Aş.1800. The expence cannot
easily be ascertained.
I will furnish you, at any time you please, with the detail of my estimates, which I believe will not be found short of the reality.
In order the ascertain the probable proceeds of the works, I will suppose, that of six thousand houses, four thousand families will supply themselves with water from the main. The water-rent which I paid while residing in London, in a house of twenty-four feet front, was thirty-six shillings, sterling, or eight dollars. Fixing ten dollars as the first average rent, which as the funds become prosperous, may be annually lowered, this alone would produce an annual rent of 40,000 dollars, independently of extra supplies to brewers, distillers, or very large families.
40,000 dollars rent, at 6 per cent. per annum, is equivalent to a capital of 666,666 Dollars 66 Cts.
I will now add a few
remarks upon the following proposals, which have been supposed to be
worthy of consideration, and which indeed, are the only schemes that have
come to my knowledge, are the schemes that have come to my knowledge, that
I. To complete the canal immediately.
II. To conduct Wissahikon-creek to the city.
III. To erect water-works to be driven by one of the two rivers.
IV. To collect water from any practicable source, and bring it over hill and dale in wooden, and perhaps, in iron pipes, to Philadelphia.
If, and I presume it will not easily be disputed, the three requisites of (1st.) immediate utility, (2d.) permanence, and (3d.) security against frost, be indispensible, I will dismiss these proposals in a few words.
I. The first is deficient in the first, and I fear in the last.
II. The second, (if at any time the water were sufficient) in the first and last.
III. The third in the second and third.
IV. The fourth in permanence, and I think, in efficiency.
I. As to the canal, I am convinced that the very eminent and acknowledged abilities of the Engineer Mr. Weston, could overcome any obstacles which art dare combat; and that a work, in which he has already done himself so much honor, would not want completion if it upon upon his genius or his industry. If, therefore, the work could be accomplished in time, it certainly would render great part of the expense, which I have proposed, unnecessary. But, from what I have heard, doubt may be entertained of the possibility of the necessary expedition. But I confess myself very imperfectly informed. I fear the ice would embarrass the winter-supply for culinary use, but to every other purpose its water would be amply adequate.
II. Wissahikon-creek has, I believe, not a sufficient quantity of water. Besides, to get the water upon a proper elevation, it would be necessary to purchase two mills, and then to bring the water to town over very unfavorable ground. The creek has, even this winter, almost frozen to the bottom, and yielded very little water.
III. The examples of London, (London bridge works,) Versailles, (Marly,) and Bremen, would forever deter me from attempting works to be driven by a river subject to ice and freshes. The expense of keeping up the timber-work is enormous, and equal to rebuilding once in seven years. To give such works power, they must be unwieldy. Cranks, which are their necessary appendage, are the very worst things in mechanism. In the Delaware or Schuylkill, the works might stand still six hours in twenty-four: perhaps during the raging of a fire. I once saw several houses in London burn down, while the works were waiting for the ride. This happens not unfrequently. In winter they would be wholly useless.
IV. To bring water, in pipes, of any description, a yard further than necessity requires, is very bad economy. All water has more or less sediment, and pipes cannot be cleansed without taking them up. It is difficult often to find where the fault lies. Metal pipes are very liable to injury from the frost, and in a long extent every part could not be equally secured. Wooden pipes, like everything else that is wooden, are a perpetual source of Expence, repair, and interruption. The inconvenience attending them in distributing water must be borne, because it cannot be avoided, but where it can be avoided, it ought not to borne.
By the length of this
letter, you will see that I have endeavored to comply fully with your
request, by the want of detail, you will observe that I have been
straightened in time.
I am, Sir, With great esteem, your's faithfully, B. Henry Latrobe.
To John Miller, Esquire, Chairman of the Committe of the Select Council of the City of Philadelphia.
I am induced to add still the following remarks, as connected with the subject of my letter.
Although most men prefer spring, to river water, it may be doubted, whether the latter may not be more wholesome. It is generally supposed by Physicians to be more generally free from noxious ingredients. The Indians, I am informed, from motives of health now grown into habit, never drink water from a spring, when they can procure it from a stream. London is entirely supplied with river water. It is taken from the Thames in different places, from the New River, and from the river Lee; and has nothing to boast of the cleanliness of its aqueducts. The water is received in each house in wooden, or leaden cisterns, which is deposits a black impalpable mud. When boiled the new New River water crusts the vessel with a calcareous precipitate, so as in time to choak the spouts of the tea kettles. I believe that the country, in which the river rises, has a basis of chalk. The water must, therefore, be similar to that of the Schuylkill in quality, though very inferior in purity. The houses in London are supplied only once in two days. The water then runs about three hours. Yet during some years residence in London I thought it very pleasant, and I am certain it is very wholesome. It is preferred to the water of any spring in the two cities and suburbs, and those that have any fame, (such as St. Paul's or Aldgate,) owe it to their coldness, not their superior salubrity. I must remark, that I never knew a deficiency of water in my family, notwithstanding the distant intervals between the supplies. The cisterns always ran over during the last hour of the water's coming in. This shows how sufficient our own resources are.
In this hot climate, however, cool water is more valuable than in London, and perhaps, absolutely necessary. The Mill-spring seems to possess every desirable quality, in a degree which our most sanguine wishes could scarce have expected.
The engine proposed for Center-square, may be considered as a necessary and unavailable expence, by whatever means the water be brought to town. It may be rendered an ornament to the city. Its use is to supply water to the higher levels of the town, and fountains in all the streets. The air produced by the agitation of water is of the purest kind, and the sudden evaporation of water, scattered through the air, absorbs astonishing quantities of heat, or to to use common phrase, creates a great degree of cold. Coal mines, which are troubled with foul air, are supplied with pure air by the simple means of pouring a small stream of water through a trunk, down the shaft into a cask. The air extricated in the trunk and cask, is conveyed by means of pipes to distance parts of the works. When the shaft is deep it will blow out so strongly that a man cannot stand against it. The water blast, used in Switzerland in the furnaces, which is produced by the same simple means, is that strongest that can be devised, and on account of the purity of the air, partakes of the superiority of the chemical oxygen furnace.
As to the mechanism of the fountains, it consists merely of a short wooden pipe, set perpendicularly into the main, and stopped by a cock, which is turned, when the fountain is not in use. The name produces an idea of great expence, but they may be realized at a very small one.
III. Public Baths.
I have often wondered, that while in many despotic countries, all ranks of men have ben provided with the convenience, and the wholesome pleasantness of public baths, fountains, and porticoes, the American people do not indulge themselves, in the smallest gratification, as salubrious, as it is innocent of this kind. Our abstinence is commendable, as it arises from industry, andour attention to more serious pursuits, but highly blameable as it injuries our health. We retain indeed both in our habits, our diet, and our modes of life, the habits of our Northern ancestors, and have no yet learned how to live healthy in a hot climate. In the city of Philadelphia, I think baths almost an absolutely necessary means of health. When the engine in center square is at work it will with great ease supply a requisite number of baths. I mention this only as a hint. It might be worth while to look forward to some such thing in the arrangement that may be thought of, provided the proeparation may be made without expence. I think it may. Such baths would be a source of a large revenue and perhaps it might not be bad policy in the citizens of this primary metropolis of North America, to counterbalance the fashionable inducements, which point to the Potowmac, by conveniences, and advantages which cannot for many years be thought of in a city, which is at present almost destitute of dwellings.
IV. Steam Engines.
For want to the necessary information of what can be executed in this city, which I have not had time to procure, some uncertainty in the estimates, in which the Steam Engines are concerned, must be expected. I have said nothing of their power, because it is perfectly at your option from the supply of five hundred to any higher number of gallons per minutes. I have no doubt but that this city can produce Smiths capable of constructing very efficient Engines, under proper direction.
The annual expence of each Engine, and repairs, will not exceed three thousand dollars.
Philadelphia, December 18, 1811.
From View of the Practicability and Means of Supplying the City of Philadelphia with wholesome water, in a letter to John Miller, Esquire., from B. Henry Latrobe, Engineer, December 29, 1798
Reprinted in Report of the Committee appointed by the Common Council to enquire into the state of the Water Works. December 5, 1801
İ 2018 Morris A. Pierce