New Britain herald., 1921-02-09
bELVIDERE SEWAGE
 SYSTEM DISCUSSED
City Engineer Reports to Public
 Works Board on Project

A board last evening on the proposed method of sowage disposal in tho Bel videre section Of the city. as follows:
 The present trunk limo sewers as laid out do not take care of tho DOT ton Of tho city lying north of JubIlco street extension. east Of Market rect. north Of Seymour avenue. east of tho railroad and north Of Allen street Two sections Of this area arc laid out as building lots. The first is known as tho Bronson Heights and seymour Park sections. and quite a nunbor of dwellings already exist fin this area. The sccond section Is tho Delvidsre section. lying between AL len street and the North End park The total area which eventually must ho severed is approximately 1900 acres.
 Method of conveying the sewage from these areas ID Gravity system. The sewage from tho Bclviderc sec ton can bo brought to n point on tho eastern side Of the railroad line. near the point where the Piper Brook crosses the city line. From this point it can bo conveyed through an invcrt- cd Riphon under Piper Brook and a 2.00O foot tunnel just inside the city limo to Seymour avenue. Thence by 9 24-inch scwer following tho pro posed streets along the $ewington limo to $owington avenue: thence by right ot way to tho end of the present 36-ineh concrete sewer. about 15O feet south of Jubilee street To avoid hcavy cuts this latter linc has been laid out about 600 feet east Of tho city limo. between Booth avenue and Sunrisc avenue a distance of about 1 .060 feet. This limo will take tho sowage from tho property located along tho street through which ii passes nnd also from tho balance of the area cast Of Market street by means of small sewers.
 The present flow from tho Rclvidore section wll not produce n Rclf-cleans- ing velocity ot l.5 feet per second through the inverted siphon and tunnel section. IL is estimated that a popula ton Of 15,O0O will he neces- rary to produce n minimum How Of this amount. This population may be expected in approximately s 10 10 years. To secure the minimum flow Of Is feet per second a dosing tank has been designed. consisting of two 10000 gallon compartments with automatic siphons. Tho sewage will then be collected In the dostng tank and discharged through the siphon and tunnel in quantities of 10000 gallons per discharCe. When the population in such as to give the minimum flow. tho tank with its automatic siphons may be discarded. and m additional pipe laid in the inverted Ephon.
 Pumping. Under this plant tho sewage from Belvidere and the DOT ton Of Seymour Park lying north of Seymour avenue is brought to collecting well at tho same site as tho proposed dosing tank on tho gravity system. and pumped up through a cast iron force main to the west portal ot the present tun- mel in Fairview cemetery.
 This would require the cnnst ruction Of n suitable pumping station. and tho installation of an electric operated centrifugal pump. increasing the ca pacity aE required. This would also require tho extending of tho present 36 inch concrete sewer from Jubilee ] street noTthcriy to the outlet end of tho present tunnel. IL would also re- | quire to serve the area Of Seymour ! Park and Bronson Heights, south of Seymour avenue. tho construction of ! n trunk line and small service sewers. i following approximately the line laid i out for 'thC proposed gravity system "Comparison Of estimated costs. { Gravity system: In this section tho 1 ?.000 foot tunnel will constitute the 1 largest item. Tho section conter- plated Is | feet wtde and feet in clear height. Owing to the flat grade n Is proposed 10 place q concrete in- vert, but no lining will beplaced. cx- copt where required 10 support tho rock roof. Tho present tunnel was built through tho same ridge and is | unlined
 Tho records do not show any dim culty from falling rock since con Etructed. Cost data is not available for recent small tunnels. SO $50 per foot has been taken as m outside figure. Inc portion of tho line act Ing as a street sewer has becn omit ted in tho comparison as these streets must bo severed eventually.
 "T recommend that authority hc secured to carry on preliminary work and engineering consultation and to prepare plans for tho construction Of
 Aovity system Of conveying the
 Of the north and cast sections
 oity to tho sewage disposal