File:Pacific municipalities (1910) (14776236402).jpg

Identifier: pacificmunicipal232419101911leag (find matches)
Title: Pacific municipalities
Year: 1903 (1900s)
Authors: League of California Municipalities League of Pacific Northwest Municipalities
Subjects: Municipal government
Publisher: San Francisco : Pacific Municipalities
Contributing Library: San Francisco Public Library
Digitizing Sponsor: San Francisco Public Library

View Book Page: Book Viewer
About This Book: Catalog Entry
View All Images: All Images From Book
Click here to view book online to see this illustration in context in a browseable online version of this book.

Text Appearing Before Image:
ters, theEngineers made every effort to insurea design properly fitted to local needsand conditions. To this end, the plansand specifications for the tanks are beingpassed on, by Dr. Imhoff himself, andby Dr. Rudolph Hering, the ConsultingSanitary Engineer of New York City,who recommended and installed the Im-hoff tanks at Atlanta, Georgia. DETAILED DESCRIPTION OF IMHOFF TANKS AT WINTERS CAPACITY. The present population ofWinters is about 1500. The disposalworks were designed to accomodatetwice this number, to avoid the necess-ity of immediately enlarging. The es-timated daily sewage flow is 7.5 gallonsper capita or 225,000 gallons for 3,000people. This is an average hourly flowof about 10,000 gallons. The sedimen-tation chambers are designed to give astorage period of three hours and havea capacity of 4,000 cubic feet equivalentto 30,000 gallons. The sludge chambers are made largeenough to store sludge for a period ofsix months. There are two suchchambers, circular with a diameter of
Text Appearing After Image:
232 PACIFIC MUNICIPALITIES 20 feet, and an effective depth for stor-ing sludge of about 6>2 feet. Thesludge capacity amounts to 1950 cu. ft.for each tank or a total of 3900 cu. ft.Estimating the amount of sludge at.007 cu. ft. per capita per the amountfrom 3000 persons would be 21 cu. ft.per da>- or 37SO cu. ft. for 180 days. TANKS. Each unit consists of a circu-lar concrete pit with an upper channelfor the flow of the sewage, the floor ofthe upper chamber being shaped liketwo troughs. Eachof these communi-cates with the lower chamber through a10 inch slot. The bottoms slope towardthe slot at an angle of 4.S degrees whichis assumed to be steep enough for thesedimented solids to slide down and passinto the sludge chamber. Where the sewage enters the sedimen-tation chamber it will pass under twoscum-boards set a foot apart with theirlower edges 18 inches below the watersurface. This will keep out floatingmatter, if a scum forms back of or be-tween the boards, it can be readily re-

Note About Images