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92
The earth above the pipes was "made ground" consisting of earth
and brick rubbish.
From manhole A to manhole B a Gin. iron pipe has been introduced
with a gradient of 1 in 28.44. A section is shown on drawing B which
gives the gradient of the 9in. drain. I tested the 9in. main stoneware
drain from manhole A, heading the water back, and the following table
shows the leakage at different heads showing that the pipe is in a very
faulty state.

The leakage would be considerably more than these figures show,
because while the tests were being made the sewage was not stopped
from entering the drain. The last five readings show that large volumes
of sewage entered the pipe at the time the readings were taken. The
water level could be seen rising and falling.
Tests applied to Block Nos. 1—20 made on November 17th.
I applied both smoke and water tests to this block with the following
results:—
The smoke test revealed the same state of affairs as existed in Block
Nos. 121—140. The w.c.'s, sinks and flushing tanks were in a similar
state to those in the other blocks.
I applied the water test to the drains and the leakage observed was
as follows :—
The 6in. pipes marked A and B on drawing A had a head of 3.5ft.,
equal to 1¾lbs. per square inch. The pipe A leaked at the rate of 270
gallons per hour, and the pipe B at the rate of 144 gallons per hour.