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72
will deliver 12,960 cubic feet per hour; and with a rainfall of half an
inch per hour over the area to be drained it will only be called upon
to deliver 7,500 cubic feet, but it is capable of taking 0.86 inch of
rainfall over the area to be drained. If an 18 in. pipe had been substituted
for the 12in. one with its present fall, there would have been
a velocity of 330 feet per minute, and it would have delivered 15,540
cubic feet per hour—a gain of 2,580 cubic feet over the 12in. pipe.
Under the above circumstance the 12in. pipe was much the better, for
it will stand less chance of silting up and become an elongated cesspool
in dry weather, when the flow through the sewer is only the
aggregate flushing from the two-gallons w.c. tanks and slops from the
110 houses in the street; and it will be remembered that a cubic foot
contains 6.23 gallons.
The cesspools on the Cottage Street estate have been abolished
and the houses draining into the same have been pulled down. The
drains of the houses discharging into the sewer (combined drain) on
the east side of Ferry Street, have been made good, aud at the time
of writing this report, the re-draining of Dock Cottages (70 houses)
is almost complete, and a scheme for the re-drainage of the houses
on the east side of Plimsoll Street is under consideration.
During the year plans were submitted for the drainage and re.
drainage of 362 premises in Poplar and Bromley, and the Inspector's
reports will give the number of houses which were re-drained on the
old lines without the necessity of plans being presented. Numerous
complaints in the hot weather reached the offices respecting the smell
emanating from the street gullies, doubtless due to their traps becoming
unsealed through the water evaporating. It was found that
upon testing some house drains the smoke came up through the
gullies. I reported this to the Committee, and two additional water
carts were obtained.
The wood pavement in the road outside the Poplar Hospital was
kept watered with a solution of disinfectant during the hot weather.