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45
SECTION III.
SEWERAGE AND DRAINAGE.
The district is sewered on the separate system. The surface water is
conveyed into the Pymmes and Salmons Brooks. The sewage proper, together
with that of the neighbouring district of Southgate, passes to the Counoil's
sewage farm of 233 acres. Mr. Frank Rackham is the farm bailiff. A section
of the northern main sewer, by " Halliwick," has been relaid and made watertight.
THE SEWAGE FARM.
The only crops now grown on the farm are rye grass and mangolds, as
broad irrigation is gradually being displaced for filters of clinker. Only
about 170 out of 233 acres is being used for broad irrigation. Our farm is
in an interesting stage of passing by degrees from broad irrigation to a
system of bacterial filters. The first filter bed started working in the gravel
pit on the 9th June, 1913. In October, 1913, another bed, adjoining Deepham's
Farm, was commenced; its dimensions are 150 feet long by 100 feet
wide. This, in June, 1916, was reported in good Working order, and producing
excellent results; the effluent therefrom is now passed over the fields before
discharge into Salmon's Brook. The nature of the warm liquid sent down
from the gas works, out of their sulphate of ammonia plant, causes our
Engineer considerable trouble to deal with. The backing-up of the water
in Pymmes Brook at Tottenham Hale is another chronic source of trouble
from flooding.
Samples of the sewage effluent have been taken from time to time by the
Lea Conservancy Board and the County Inspectors, and we always have
received a good report on analysis. When available, carts have been engaged
carting house-refuse on to the site of the proposed No. 3 Filter, so as to
raise the foundation to the necessary height. The old carrier on the high
level, just east of the main effluent channel, has been cleaned out to a depth
of 2 feet and filled in with clinkers; at the same time it was considerably
narrowed; it ends in Plot 16, towards Angel Road.
Several new valves and pots have been constructed at the inlet to the
low-level bacteria bed (No.1) in the pit north of the Pegamoid Works,
enabling a further supply of the sewage to be given to it, as the bed had
not been working to its full capacity. The underground reservoirs of the
Montagu Road Pumping Station have been cleaned out and two new 20-inch
penstocks have been fitted.