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32
SANITARY CIRCUMSTANCES OF THE AREA
WATER SUPPLY
Apart from a small area in the extreme south-west part of the district
which is supplied by the Rickmansworth and Uxbridge Valley Water
Company, the Borough is supplied by the Colne Valley Water Company.
Nearly all the water supplied by them is obtained from a series of wells
that are fed by gathering grounds in the Chilterns.
The supply has been satisfactory in quantity and quality and no
adverse sample reports were received. The following is a copy of the
result of the chemical analysis of a sample submitted for examination
in April—
Chemical results in parts per million
Appearance: Metals-Iron, Zinc, Copper and Lead:
Bright with a few mineral particles —Absent
Colour Nil Turbidity less than 3
PH 7.3 Odour Nil
Electric Conductivity 750 Free Carbon Dioxide 19
Chlorine present as Chloride 68 Dissolved Solids dried at 180°C 520
Hardness: Total 270 Alkalinity as Calcium Carbonate 215
Nitrate Nitrogen 6.4 Non-carbonate 55
Ammoniacal Nitrogen 0.000 Nitrite Nitrogen Absent
Albuminoid Nitrogen 0.023 Oxygen Absorbed 0.45
Residual Chlorine Absent
"This sample is practically clear and bright in appearance, neutral in
reaction and free from iron and other metals. The water is hard in
character but not to an excessive degree, contains no excess of mineral
constituents and it is of very satisfactory organic quality.
From the aspect of the chemical analysis these results are indicative
of a pure and wholesome water suitable for drinking and domestic
purposes."
DRAINAGE AND SEWAGE DISPOSAL
The soil sewage from the Borough flows to the West Middlesex
Drainage Works at Mogden as it has done since 1936 when the last of the
five disposal works in the area went out of use.
There are still, however, a few properties in the northern part of the
district from which the sewage is treated in small disposal plants, otherwise
all the properties within the Borough are connected to the main drainage
system.
Surface water is disposed of by way of separate sewers that discharge
into local water courses. There are five of these; the River Pinn; the
Yeading Brook; the Kenton Brook; the Wealdstone Brook and the
Edgware Brook.
The rate of flow in these water courses varies with the amount of
rain fall and during sudden storms they may have to carry very large
volumes of water, while during drought the flow may be reduced to a
mere trickle.