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being sealed off with planks. The tops of the wells are above the level
of the ground, so surface water or surface washings are unlikely to find
their way into the wells.
(5) A shallow well at the City Cottages which has for years been
sealed off with stone slabs. No pollution is likely to occur, nor is it
probable that the well water communicates with the deeper underground
water.
(6) A shallow well in the forecourt of the Fountain Public House,
Church Road, Stanmore. This has not been used for years, and is now
surfaced over.
(7) There is a deep well at Messrs. Hivæ, Limited, Greenhill Crescent.
The well opening is concreted over.
(8) The deep well at the Greenhill Laundry is no longer in use, and is
sealed over with a stone slab.
The position, then, is that the use of the superficial wells has been
largely discontinued and no pollution is likely to occur of the deep wells.
Those not in use are adequately sealed, so that their pollution is unlikely.
On the other hand, there is little risk of pollution of these deep wells
which are in use.
DRAINAGE AND SEWAGE DISPOSAL.
The district is served by the separate system of drainage.
Early in 1936, the last of the five sewage disposal works, which had up
to this treated the sewage of the district, ceased to be used for this purpose.
Since then, virtually all the sewage from this area has been
treated under the West Middlesex Drainage Scheme at the disposal
works at Mogden, where it is treated by the activated sludge process.
The capacity of the trunk sewers and main outfall sewers is such that
it is estimated on a dry weather flow at 40 gallons per person per day,
they can serve an ultimate population of 330,000. At South Vale, Sudbury,
a pumping station lifts sewage some 80 feet from the South Vale
area to the high-level sewer in South Hill Avenue.
There are still a few houses on the northern fringe of the district
from which the sewage is treated mostly in small plants in the grounds of
the houses, the effluent finding its way to a water course.
Open water courses generally are under the jurisdiction of the County
Council or of the Thames Conservancy, but long lengths running through
developed land have been culverted and so have become the responsibility
of the district council. In some cases, the Council has acquired land
along the banks. There are five main water courses in the district.
The River Pinn (under the control of the Thames Conservancy) rises in
the Royston Park Estate; running in a southerly direction to High
Street, Pinner, during which part is open and part culverted, it then
turns in a westerly direction, passing out of the district between Cuckoo
Hill and Eastcote Road. The Yeading Brook rises in two sources, one
near the Pinner Road recreation ground, the other near Headstone
Manor. The two streams, which are culverted in part, join at Hooking
Green Bridge, and then run in a south-westerly direction through North
Harrow and Harrow Garden Village, leaving the district near Yeading
Avenue. The Wealdstone Brook, rising in Harrow Weald, runs in an