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10
SANITARY CIRCUMSTANCES.
Water Supply.
The water supply for the district is from the mains of the
Metropolitan Water Board; the quality of water has throughout
this year been good, and the service is a constant one.
42 houses in Heston Parish are supplied from the main of
the South-West Suburban Water Co.
There were, as far as is known, at the end of the year 39
private wells from which the water was used for domestic purposes.
Ill three other cases there are wells but an alternative
supply from the main exists for domestic purposes.
In 104 instances draw-taps were placed on the main to the
house, in compliance with notice from the Health Department, in
lieu of a supply drawn from an inaccessible and uncovered cistern.
Drainage and Sewerage.
The sewerage of almost the whole district is arranged on the
" separate " system. The sewage is mainly of domestic character,
but trade waste from soap works, laundries,dye works, pharmaceutical
works and a brewery is also a constituent.
The dry weather flow is about 2,000,000 gallons, of which
two-thirds reaohes the works by gravitation, the remainder having
to be lifted by Shone's Ejectors situated in different parts of the
district lying below the level of the works.
At the works the crude sewage, after being screened and
having grosser materials removed in passage through a detritus
tank, is treated in covered septic tanks, the total capacity of which
is 1,800,000 gallons.
After passing through the septic tanks the sewage is conveyed
by covered channels to "contact beds," of which there are 15
occupying close upon 4 acres. Filling of the beds is.effected from
below, upwards.
Finally the effluent from the contact beds is conveyed by an
outlet pipe, 1^ miles long, direct to the Thames.