[Report 1956] / Medical Officer of Health, Torquay Borough.

  • Torquay (England). Borough Council.
Date:
1956
Catalogue details

Licence: Attribution 4.0 International (CC BY 4.0)

Credit: [Report 1956] / Medical Officer of Health, Torquay Borough. Source: Wellcome Collection.

    18/68 (page 16)
    Fortunately the rainfall on the catchments during July and August was in excess of average and this improved the supply position. As a result the application for an Order was withdrawn on the 13th August and on the 31st August the restrictions were removed. Nevertheless the drought gave the Corporation unmistakeable warning of the insufficiency of the existing sources of supply to meet the growing demands upon their Undertaking and steps are now being taken to seek an additional source of supply. (ii) Where there is a piped supply, whether bacteriological examina¬ tions were made of the raw water and, where treatment is installed, of the water going into supply; if so, how many and the results obtained; the results of any chemical analyses. Both chemical and bacteriological examinations have been made of the raw and treated water. The whole of the supply is treated, this comprising coagulation with Sulphate of Alumina and Soda Ash, filtration through pressure filters, addition of lime water to neutralise the acidity and increase the bicarbonate alkalinity, and finally sterilisation by the application of gaseous chlorine. The raw water is normally acid with a pH value varying from 6.0 to 6.7; after treatment the value is raised to about 9.0, which results in the consumers receiving a water on the alkaline side of neutrality. The chlorine dosage is normally about one part per million, but is adjusted so as to maintain a residuum in the water, passing into distribution from the service reservoirs. Several chemical and bacteriological analyses have been made of the raw and finally treated water as follows: RAW WATER A—Chemical and Bacteriological, Fernworthy Inlet at Trenchford Reservoir —Taken 20.9.56. B—Chemical and Bacteriological, Trenchford Reservoir Draw-off Valve Tower—Representing water conveyed to Pressure Filters—Taken 20.9.56. FILTERED WATER O—Chemical and Bacteriological'—Filtered Water Main from Pressure Filters—With coagulation but prior to alkalisation with lime and sterilisation with gaseous chlorine—Taken 20.9.56. FULLY TREATED WATER D—Chemical and Bacteriological—Gallowsgate Service Reservoir—Taken 29.11.56. E—Chemical and Bacteriological, Great Hill Service Reservoir—-Taken 20.9.56. F—Chemical and Bacteriological, Warberry Service Reservoir—Taken 29.11.56. G—Chemical and Bacteriological, Chapel Hill Service Reservoir—Taken 29.11.56.