[Report 1906] / Medical Officer of Health, Leek U.D.C.

  • Leek (England). Urban District Council.
Date:
1906
Catalogue details

Licence: Attribution 4.0 International (CC BY 4.0)

Credit: [Report 1906] / Medical Officer of Health, Leek U.D.C. Source: Wellcome Collection.

    11/52 (page 11)
    Government Board in relation to sewage disposal are that they consider that whatever system is adopted as a means of dealing with the sewage it is necessary that provision should be made (i) for treating fully as ordinary sewage a volume of mixed sewage and storm water equal to three times the dry-weather flow of sewage, and (2) for dealing with the excess of storm water up to six times the dry-weather flow by passing it through a special and separate storm-water filter of sufficient extent, or by dealing with it on a special and separate area of prepared land, other than that in use for the treatment of the effluent from the ordinary tanks or filters. Having thus ascertained the dry-weather flow it was easy to find out that the works, as they were, and as proposed, had to deal with 1,200,000 gallons per day, boo,000 gallons to be treated as sewage and 600,000 gallons as storm w'ater. It has been generally found in dealing with the effluent from septic tanks that a day’s rest in the tanks is sufficient to liquefy the sewage and prepare it for the treatment on filters, although it has been found impos¬ sible to lay dowm hard-and-fast rules equally applicable to all cases ; but having regard to the distance the sewage has to travel in the outfall sewers before it reaches the site of the disposal works, and the gradient at which the outfall sewer is laid, causing the sew'age to reach the works in a comparatively fresh condition, the tanks wrere designed with these figures of dry-wreather flow as a basis. Tanks.—The tanks thus provided are two in number, running parallel to each other, and each 100 ft. long by 25 ft. w'ide, with an average depth of 6 ft. 6 in.— 8 ft. 6 in. at the inlet ends and 5 ft. at the outlet sill level. They are built of Staffordshire blue bricks, coped