Part 107
We have as yet dealt only with the means of removing the liquid refuse from the houses of the metropolis. This, as was pointed out at the commencement of the present subject, consists principally of the 19,000,000,000 gallons of water that are annually supplied to the London residences by mechanical means. But there still remain the 5,000,000,000 gallons of surface or rain-water to be carried off from the 1760 miles of streets, and the roofs and yards of the 300,000 houses which now form the British metropolis. If this immense volume of liquid were not immediately removed from our thoroughfares as fast as it fell, many of our streets would not only be transformed into canals at certain periods of the year, but perhaps at all times (except during drought) they would be, if not impassable, at least unpleasant and unhealthy, from the puddles or small pools of stagnant water that would be continually rotting them. Were such the case, the roads and streets that we now pride ourselves so highly upon would have their foundations soddened. “If the surface of a road be not kept clean so as to admit of its becoming dry between showers of rain,” said Lord Congleton, the great road authority, “it will be rapidly worn away.” Indeed the immediate removal of rain-water, so as to prevent its percolating through the surface of the road, and thereby impairing the foundation, appears to be one of the main essentials of road-making.
The means of removing this surface water, especially from the streets of a city where the rain falls at least every other day throughout the year, and reaches an aggregate depth of 24 feet in the course of the twelvemonth, is a matter of considerable moment. In Paris, and indeed almost all of the French towns, a channel is formed in the middle of each thoroughfare, and down this the water from the streets and houses is continually coursing, to the imminent peril of all pedestrians, for the wheels of every vehicle distribute, as it goes, a muddy shower on either side of the way.
_We_, however, have not only removed the channels from the middle to the sides of our streets, but instituted a distinct system of drainage for the conveyance of the wet refuse of our houses to the sewers--so that there are no longer (excepting in a very small portion of the suburbs) open sewers, meandering through our highways; the consequence is, the surface-water being carried off from our thoroughfares almost as fast as it falls, our streets are generally dry and clean. That there are exceptions to this rule, which are a glaring disgrace to us, it must be candidly admitted; but we must at the same time allow, when we think of the vast extent of the roadways of the metropolis (1760 miles!--nearly one-half the radius of the earth itself), the deluge of water that annually descends upon every inch of the ground which we call London (38,000,000,000 gallons!--a quantity which is almost sufficient for the formation of an American lake), and the vast amount of traffic, over the greater part of the capital--the 13,000 vehicles that daily cross London Bridge, the 11,000 conveyances that traverse Cheapside in the course of twelve hours, the 7700 that go through Temple Bar, and the 6900 that ascend and descend Holborn Hill between nine in the morning and nine at night, the 1500 omnibuses and the 3000 cabriolets that are continually hurrying from one part of the town to another, and the 10,000 private carriage, job, and cart horses that incessantly _perviate_ the metropolis--when we reflect, I say, on this vast amount of traffic--this deluge of rain--and the wilderness of streets, it cannot but be allowed that the cleansing and draining of the London thoroughfares is most admirably conducted.
The mode of street drainage is by means of what is called a gully-hole and a gully-drain.
_The Gully-hole_[63] is the opening from the surface of the street (and is seen generally on each side of the way), into which all the fluid refuse of the public thoroughfares runs on its course to the sewer.
_The Gully-drain_ is a drain generally of earthenware piping, curving from the side of the street to an opening in the top or side of the sewer, and is the means of communication between the sewer and the gully-hole.
The gully-hole is indicated by an iron grate being fitted into the surface of the side of a footpath, where the road slopes gradually from its centre to the edge of the footpath, and down this grate the water runs into the channel contrived for it in the construction of the streets. These gully-grates, the observant pedestrian--if there be a man in this hive of London who, without professional attraction to the matter, regards for a few minutes the peculiarities of the street (apart from the houses) which he is traversing--an observant pedestrian, I say, would be struck at the constantly-recurring grates in a given space in some streets, and their paucity in others. In Drury-lane there is no gully-grate, as you walk down from Holborn to where Drury-lane becomes Wych-street; whilst in some streets, not a tenth of the length of Drury-lane, there may be three, four, five, or six grates. The reason is this:--There is no sewer running down Drury-lane; a contiguous sewer, however, runs down Great Wyld-street, draining, where there are drains, the hundred courts and nooks of the poor, between Drury-lane and Lincoln’s-inn-fields, as well as the more open places leading down towards the proximity of Temple Bar. This Great Wyld-street sewer, moreover, in its course to Fleet Bridge, is made available for the drainage (very grievously deficient, according to some of the reports of the Board of Health) of Clare-market. Grates would of course be required in such a place as Drury-lane, only the street is thought to be sufficiently on the descent to convey the surface-water to the grate in Wych-street.
The parts in which the gully-grates will be found the most numerous are where the main streets are most intersected by other main streets, or by smaller off-streets, and indeed wherever the streets, of whatever size, continually intersect each other, as they do off nearly all the great street-thoroughfares in the City. Although the sewers may not be according to the plan of the streets, the gully-grates must nevertheless be found at the street intersections, whether the nearest point to the sewer or not, or else the water would not be quickly carried off, and would form a nuisance.
I am informed, on good authority, both as regards the City and Metropolitan Commissions, that the average distance of the gully-grates is thirty yards one from another, including both sides of the way. Their number does not depend upon population, but simply on the local characteristics of the highways; for of course the rain falls into all the streets in proportion to their size, whether populous or half-empty localities. As, however, the more distant roads have not such an approximation of grates, and the law which requires their formation is by no means--and perhaps, without unnecessary interference, cannot be--very definite, I am informed that it may fairly be represented, that, of the 1760 miles of London public ways, more than two-thirds, “or” remarked one informant, “say 1200 miles, are grated on _each_ side of the street or road, at distances of sixty yards.” This would give 59 gully-holes in every one of the 1200 miles of street said to be so supplied. Hence the total number throughout the metropolis will be 70,800.
_The gully-drain_, which is the street-drain, always presents now a sloping curve, describing, more or less, part of a circle. This drain starts, so to speak, from the side of the street, while its course to the sewer, in order to economize space, is made by any most appropriate curve, to include the reception of as great a quantity of wet street-refuse as possible; for if the gully-drains were formed in a direct, or even a not-very-indirect line, from the street sides to the sewers, they would not only be more costly, more numerous, but would, in fact, as I was told, “choke the under-ground” of London, for now the subterranean capital is so complicated with gas, water, and drain-pipes, that such a system as will allow room for each is indispensable. The new system is, moreover, more economical. In the City the gully-drains are nearly all of nine-inch diameter in tubular pipeage. In the metropolitan jurisdiction they are the same, but not to the same extent, some being only six inches.
Fifty, or even thirty years ago, the old street channels for gully drainage were costly constructions, for they were made so as to suit sewers which were cleansed by the street being taken “up,” and the offensive deposit, thick and even indurated as it often was in those days, drawn to the surface. Some few were three and even four feet square; some two feet six inches wide, and three or four feet high; all of brick. I am assured that of the extent or cost of these old contrivances no accounts have been preserved, but that they were more than twice as costly as the present method.
In all the reports I have seen, metropolitan or city--the statements of the flushermen being to the same purport--there are complaints as to the uses to which the gully-holes are put in many parts, every kind of refuse admissible through the bars of the grate being stealthily emptied down them. The paviours, if they have an opportunity, sweep their surplus grout into the gullies, and so do the scavagers with their refuse occasionally, though this is generally done in the less-frequented parts, to get rid of the “slop,” which is valueless.
In a report, published in 1851, Mr. Haywood points out the prevalence of the practice of using the gully-gratings as dustbins! A sewer under Billingsgate accumulated in a few months many cart-loads, composed almost wholly of fish-shells; and 114 cart-loads of fish-shells, cinders, and rubbish were removed from the sewers in the vicinity of Middlesex-street (Petticoat-lane); these had accumulated in about twelve months. “Reconstructing the gullies,” he says, “so as to intercept improper substances (which has been recently done at Billingsgate), might prevent this material reaching the sewers, but it would still have to be removed from the gullies, and would thus still cause perpetual expense. Indeed, I feel convinced that nothing but making public example by convicting and punishing some offenders, under clause 69 of ‘The City of London Sewers’ Act,’ will stop the practice, so universal in the poorer localities, of using the gullies as dustbins.”
_The Gully-holes are now trapped_--with very few exceptions, one report states, while another report intimates that gully-trapping has no exception at all. The trap is resorted to so that the effluvium from a gully-drain may not infect the air of the public ways; but among engineers and medical sanitary inquirers, there is much difference of opinion as to whether the system of trapping is desirable or not. The general opinion seems to be, however, that all gullies should be trapped.
Of the City gully-traps, Mr. Haywood, in a report for the year 1851, says, as regards the period of their introduction:--
“About seventeen years ago your then surveyor (Mr. Kelsey) applied the first traps to sewer gullies, and from that date to the present the trapping of gullies has been adopted as a principle, and the city of London is still, I believe, the only metropolitan area in which the gullies are all trapped. The traps first constructed have since been (as all first inventions or adaptations ever have or will be) improved upon, and are rapidly being displaced by those of more improved construction.
“Now, of the incompatible conditions required of gully-traps, of the difficulty of obtaining such mechanical appliances so effective and perfect as can _theoretically_ be devised, but yet of the extreme desirability of obtaining them as perfect as modern science could produce, your honourable court has, at least, for as long as I have had the honour of holding office under you, been fully alive to; no prejudice has opposed impediment to the introduction of novelties; your court has been always open to inventors, and, at the present time, there are sixteen different traps or modes of trapping gullies under trial within your jurisdiction.
“Nor has the provision of the means of excluding effluvium from the atmosphere been your only care; but the cleanliness of the sewers, and the prevention of accumulation of decomposing refuse, both by regulated cleansings, and by constructing the sewage upon the most improved principles, have also been your aim and that of your officers; and I do not hesitate to assert, that the offensiveness of the escape from the gullies has been of late years much diminished by the care bestowed upon the condition of the sewers.
“374 gullies have been retrapped in the City upon improved principles during the last year.”
The gully-traps are on the principle of self-acting valves, but it is stated in several reports, that these valves often remain permanently open, partly from the street refuse (especially if mixed with the débris from new or removed buildings) not being sufficiently liquified to pass through them, and partly from the hinges getting rusted, and so becoming fixed.
OF THE LENGTH OF THE LONDON SEWERS AND DRAINS.
There is no official account precisely defining the length of the London sewerage; but the information acquired on the subject leaves no doubt as to the accuracy of the following facts.
About 900 miles of sewers of the metropolis may be said to have been surveyed; and it is known that from 100 to 150 miles more constitute a portion of the metropolitan sewerage; this, too, independently of that of the City, which is 50 miles. Altogether I am assured that the sewers of the urban part of London, included within the 58 square miles before mentioned, measure 1100 miles.
The classes of sewers comprised in this long extent are pretty equally apportioned, each a third, or 366 miles, of the first, second, and third classes respectively. Of this extent about 200 miles are still, in the year 1852, _open_ sewers!--to say nothing of the great open sewer, the Thames. The open sewers are found principally in the Surrey districts, in Brixton, Lewisham, Tooting, and places at the like distance from the more central parts of the Commissioners’ jurisdiction. These open sewers, however, are disappearing, and it is intended that in time no such places shall exist; as it is, some miles of them are inclosed yearly. The open sewers in what may be considered more of the heart of the metropolis are a portion of the Fleet-ditch in Clerkenwell, and places in Lambeth and Bermondsey, or about 20 miles in the interior to 180 miles in the exterior portion of the capital. These are national disgraces.
The 1100 miles above-mentioned, however, include only the sewers, comprising neither the house nor gully-drains. According to the present laws, all newly-built houses must be drained into the sewers; and in 1850 there were 5000 applications from the western districts alone to the Commissioners, for the promotion of the drainage of that number of old and new houses into the sewers, the old houses having been previously drained into cesspools.
I am assured, on good authority, that fully one-half of the houses in the metropolis are at the present time drained into the sewers. In one street, about a century old, containing in the portion surveyed for an official purpose, on the two sides of the way, 76 houses, the number was found to be equally divided--half the drainage being into sewers and half into cesspools. The number of houses in the metropolis proper, of 115 square miles area, is 307,722. The majority, as far as is officially known, are now drained into the public sewers, or into private or branch sewers communicating with the larger public receptacles, so that--allowing 200,000 houses to be included in the 58 square miles of the urban sewerage, and admitting that some wretched dwelling-places are not drained at all--it is reasonable to assume that at least 100,000 houses within this area are drained into the sewers.
The average length of the house-drains is, I learn from the best sources, 50 feet per house. The builder of a new house is now required by law to drain it, at the proprietor’s cost, 100 feet, if necessary, to a sewer. In some instances, in detached houses, where the owners object to the cesspool system, a house drain has been carried 230 feet to a sewer, and sometimes even farther; but in narrow or moderately wide streets, from 18 to 26 feet across, and in alleys and narrow places (in case there is sewerage) the house drains may be but from 12 to 20 feet. Both these lengths of drainage are exceptions, and there is no question that the average length may be put at 50 feet. In some squares, for example, the sewer runs along the centre, so that the house-drains here are in excess of the 50 feet average.
The length of the house-drainage of the more central part of London, assuming 100,000 houses to be drained into the sewers, and each of such drains to be on the average 50 feet long, is, then, 5,000,000 feet, or about 2840 miles.
But there are still the street or gully-drains for the surface-water to be estimated. In the Holborn and Finsbury division alone, the length of the “main covered sewers” is said to be 83 miles; the length of “smaller sewers” to carry off the surface-water from the streets 16 miles; the length of drains leading from houses to the main sewers, 264.
Now, if there be 16 miles of gully-drains to 83 miles of main covered sewers, and the same proportion hold good throughout the 58 square miles over which the sewers extend, it follows that there would be about 200 miles of gully-drains to the gross 1100 miles of sewers.
But this is only an approximate result. The length and character of the gully-drains I find to vary very considerably. If the streets where the gully-grates are found have no sewer in a line with the thoroughfare, still the water must be drained off and conveyed to the nearest sewer, of any class, large or small, and consequently at much greater length than if there were a sewer running down the street. Neither is the number of the gully-holes any sure criterion of the measurement of the gully-drains, for where the intersections are, and consequently the gully-holes frequent, a number, sometimes amounting to ten, are made to empty their contents into the same gully-drain. Neither do the returns of yearly expenditure, presented to Parliament by the Metropolitan Court of Sewers, supply information. But even if the exact length, and the exact price paid for the formation of that length, were given, it would supply but _the year’s_ outlay as regards the additions or repairs that had been made to the gully-drains, and certainly not furnish us with the original cost of the whole.
One experienced informant told me--but let me premise that I heard from all the gentlemen whom I consulted, a statement that they could only compute by analogy with other facts bearing upon the subject--was confident, that taking only 1200 miles of public way as gully-drained, that extent might be considered as the length of the gully-drains themselves. Even calculating such drains to run from each side of the public way, which is generally the case, I am told that, considering the economy of underground space which is now necessary, the length of 1200 miles is as fair an estimate for gully-drainage (apart from other drainage) as for the length of the streets so gullied.
Hence we have, for the gross extent of the whole sewers and drains of the metropolis, the following result,--
Miles. Main covered sewers 1100 House-drains 2840 Gully-drains for surface-water of streets 1200 ---- Total length of the sewers and drains of the metropolis 5140
The island of Great Britain, I may observe, is, at its extreme points, 550 miles from north to south, and 290 from east to west. It would, therefore, appear that the main sewers of the capital are just double the length of the whole island, from the English Channel to John-o’-Groats, and nearly three times longer than the greatest width of the country. But this is the extent of the sewerage alone. The drainage of London is about equal in length to the diameter of the earth itself!
OF THE COST OF CONSTRUCTING THE SEWERS AND DRAINS OF THE METROPOLIS.
The money actually expended in constructing the 1100 miles of sewers and 4000 miles of drains, even if we were only to date from Jan. 1, 1800, is not and never can be known. They have been built at intervals, as the metropolis, so to speak, _grew_. They were built also in many sizes and forms, and at many variations of price, according to the depth from the surface, the good or bad management, or the greater or lesser extent of jobbery or “patronage” in the several independent commissions. Accounts were either not presented in “the good old times,” or not preserved.
Had the 1100 miles of sewers to be constructed anew, they would be, according to the present prices paid by the Commissioners--not including digging or such extraneous labour, but the cost of the sewer only--as follows:--
366 miles of sewers of the first class, or 1,932,480 feet, at 15_s._ per foot £1,449,360 366 miles, or 1,932,480 feet of the second class, at 11_s._ per foot 1,062,864 Same length of third class, at 9_s._ per foot 869,616 ---------- Total cost of the sewers of the metropolis £3,381,840
As this is a lower charge than was paid for the construction of more than three-fourths of the sewers, we may fairly assume that their cost amounted to from three millions and a half to four millions of pounds sterling.
The majority of the house-drains running into the sewers are brick, and seldom less than 9 inches square; sometimes, in the old brick drains, they are some inches larger, and in the very old drains, and in some 100 years old, wooden planks were often used instead of a brick or stone construction, for the sake of reducing cost, and replaced when rotted. The wood, in many cases, soon decayed, and since 1847 no wooden sewers have been allowed to be formed, nor any old ones to be repaired with new wood; the work must be of stone or brick, if not pipeage. About two-thirds of the drains running from the houses to the sewers are brick; the remaining third tubular, or earthenware pipes. The cost, if now to be formed, would be somewhat as follows:--
1893-1/3 miles of brick drains, 5_s._ per foot, as average of sizes £2,499,200 945-2/3 feet of tubular drains, average of sizes 2_s._ 6_d._ 624,800 ----------- Total cost of the house-drains of London £3,124,000
The cost of the street or gully drains have still to be estimated.