Experiments of Mr. Edward Gotto in respect to tubular back drainage, at Dover : printed February, 1849.

  • London (England). Metropolitan Commission of Sewers.
Date:
[1849]
Catalogue details

Licence: Public Domain Mark

Credit: Experiments of Mr. Edward Gotto in respect to tubular back drainage, at Dover : printed February, 1849. Source: Wellcome Collection.

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    jHttttipIttan Hclucrs. Experiments of Mr. Edward Gotfo in respect to Tubular Back Drainings, at Dover. February, 1849. My first experiment with stoneware egg-shaped pipes was, in substituting a small sewer of that description, one foot three inches high and nine inches wide, instead of an eighteen-inch barrel drain, which had two years previously been constructed; and in that short time, the joints had been so entirely destroyed by the chemical action of the decomposed deposit as to allow the sewage to penetrate into the basements adjoining. Finding, however, that the depth occupied by the greatest amount of sewage was only two inches: in my next operation, I deemed it sufficient to lay down pipes nine inches by six inches to a fall of If inches in ten feet to drain twice as many houses, a plan of which is annexed. This sewer was laid in a lane at the back of the houses in Limekiln Street at my recommendation, and by order of the Lover Pavement Board. The house-drains were laid with 6-inch pipes. A short time since I conducted, during a very heavy fall of rain, the surface drainage from ten chains in length ol street averaging thirty feet wide, with the roof water making an area together of 8066 yards superficial, through this sewer (six inches by nine inches); and found the depth occupied by the volume of water to he If inches, and the mean velocity twenty-eight inches in a second, increasing gradually as it approached the outfall. This experience will lead me for the future in a similar case to prefer a 6-inch pipe ; and from what I have observed with regard to their action, I am of opinion that house-drains may he reduced to four inches for the main branch out of the sewer to the water-closet, and to two inches for minor branches to the sink and yard grating. The two detailed estimates subjoined shew the cost of house- drainage, water supply, &c. for two houses respectively rented at £25