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93
The leakage from the 6in. pipes marked 5 and 6 (which had the same
head as A and B) was 84 gallons per hour for the former and 120 gallons
per hour for the latter. A leaking joint was found at the point marked
T, the water running out on to the pavement.
I applied the water test to the 4in. pipes marked 7 and 8 and found
them both leaking badly.
I have read a report of the evidence that was given before the
Magistrate when the case was heard, and can say that the water test
affords the only way of ascertaining whether a house drain is sound or
not. This applies equally to old as to new drains. The age of a drain
has nothing to do with the matter as the joints of a stoneware drain do
not become affected by time. The view that "it is unfair" to apply the
water test to old drains is an extraordinary one, and is at variance with
everyday practice. It is usual to apply a water test of from 3 to 5ft.
head (about 1½ to 2½lbs. per square inch) according to the levels of the
drain, as the pressure represents what the drain would have to stand in
the event of its becoming blocked.
Figures 6 and 7 show two joints taken out by the Company's
men. Figure 5 is an example showing how a well laid pipe should be
jointed.
In conclusion, I may say that all the pipes subjected to the water test
failed entirely, even those recently relaid or repaired by the Company's
men. The closets now being put in are defective owing to their not being
provided with anti-syphonage pipes. The arrangement of fresh air inlets
and ventilation to the drains is bad. The inspection chambers are
extremely faulty.
The result of my investigation leads me to express an opinion that
Ponsonby Buildings are not in a sanitary condition.
I am, Gentlemen,
Yours faithfully,
HENRY ROBINSON, M.Inst.C.E."
"Emeritus,'' Professor of Civil Engineering,
King's College, London.