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•23
SANITARY CIRCUMSTANCES OF THE AREA.
Water.
See Annual Report, 1930.
Since April, 1932, the water supply, previously obtained from
the chalk wells in Ilford and in this locality, has been supplemented
by that obtained from the River Stour. This, after being abstracted
from the river at an intake near Langham Mill, is pumped by the
Langham Low Lift Pumping Station to a reservoir which allows
for 3 days sedimentation. It then flows by gravity to the Primary
Filters, where it is subjected to rapid filtration. Before entering
these filters, it may have automatically added to it aluminoferric
as a precipitant. By gravity it Hows then to one of six slow filter
beds and, after subsequent chlorination, passes into a reservoir.
From here it is pumped by the Langham High Lift Pumping
Station through a main about 14 miles to a closed reservoir at
Tiptree, from where the Tiptree pumping plant transfers it a
distance of some 10 miles to the Danbury Reservoir. The level
of this being about 358 O.D. the water Hows by gravity to the
Herongate Reservoir, some 13 miles distant, for local distribution.
This source of supplv at present provides some 9 million
gallons daily, an amount which will probably be increased. 1 he
water provided in this locality is now a mixture of the new Stour
water and that obtained from the older source. The allowance
is roughly 20 gallons per head per day for domestic use, plus some
8 gallons per head daily for other purposes including the supply
to institutions.
A small number of complaints have been received of tastes
in the water. These apparently were due to an amount of chlorine
with which the water was dosed, and since a reduction has been
made no further complaints have been received.
Drainage and Sewerage.
See reports of 1927 and 1928.
No new soil sewers have been laid during 1932. In Rainham
Road a new surface water drain, 12" and 15 diameter, has been
laid along the section of the road from Sterling Works to Dagenham
Railway Bridge. A surface water drain, 12 and 15 diameter,
has also been laid along Whalebone Lane from Eastern Avenue to
High Road, Chadwell Heath.