The Bridgeport evening farmer., 1911-06-03

day They have no wish to change said sewer plans as they are fully Tn meeting all requirements. There are over one hundred and twenty miles of combination sewers in New Haven emptying into New Haven harbor. The following are the sizes of their trunk sewer. c Street trunk sewer outlet is 78 inches in diameter, grad ually reduced to 76 inches, "A inches and 72 inches and so on. The Bod- levard sewer is 78 inches at it's out let with similar reductions. The Meadow street sewer is "A inches at it's outlet with similar reductions. The smaller lateral sewers on shorter streets are 12 inches in diameter and on longer streets 5 inches, IS inches and above 8 inches built of brick inch, 63 inch, 72 inch, "A inch, 7G inch, 78 inch to the mouth of the main trunk sewers. Fair Haven with limited population has trunk sew CTS of 54 and 45 inches in diameter. The Boulevard sewer which is laid at the present time some four miles along the border of salt meadows on the westerly side of New Haven, will be eventually extended to Westville. Parts of the territory of Westville are not much above tide water, crea ting an almost even grade for this BOu-
 
 ovation of the larger part of the city of New Haven is from 10 to 30 feet above average low tide. As New Haven has a population of thirty five or more thousand than Bridgeport has, and using the same combination sew CT system that Bridgeport is using, with nowhere near the same cond1- tions of land elevation in their fa- vor, our present sewerage conditions are much to be preferred to theirs. As you will readily sec the New Ha- ven trunk sewers have a much lar ger capacity than our trunk sewers have. and yet the Herring system calls for a very material reduction of our present small sized trunk sewers.
 Hartford, Conn. R. A. Clarke, City Engineer. Hartford has always us- ed the combined sewer system. A few years since a large trunk sewer running through Hartford. Into this was built bordering the small river trunk sewer has been connected all the sewer outlets that formerly emp tied into this small river. This trunk sewer in connection with their other sewer system empties into the Connecticut River. They have no pumping stations or settling basins or purifying systems of any character. As the tide of Long Island Sound rises as far as Hartford in the river, it will be seen that the natural flow of the tide the same as the natural flow of the tide in our own harbors. carried this imme ense body of sewer age some forty miles down the river and empties 1t into Long Island Sound. Every one knows the size of the Connecticut River and can cas- fly compare the same with conditions existing in Bridgeport.
 Worcesters Plan.
 H. c. Gaskell, Engineer. Worces- ter commenced to change their plan of sewers ten or twelve years ago. used up to that date. Population at that time 10000. Worcester has 150,O00 population at the present time. Up to the year 1898, all sew craze was discharged into the Black stone River. This small river, not the northwest section of our city, re- ceived all the sewerage up to that time. This river flowed into the Providence River, through the City of Providence and no disease or epi- demics had developed up to that time. ed sewers used at the present time the same as were used formerly.
 H. B. Eddy. Chemist. Charles A. Allen and F. A. Mcclure. Engineers, formulated the new plan of a large trunk sewer being built to intercept
 
 system and carry the same to a sta ton about three miles distant to a pumping station and filtration beds. The filtration beds are divided into seventy-fiVe sections, allowing one acre to a bed.
 In the settling basins, part of the sewerage is treated with lime and then pumped into the river again.
 Only a few flushing tanks are used in their whole system of sewerage and these on very low levels. Man holes for cleaning main sewers are placed about 250 feet apart Hose is used principally for cleaning pur- poses. The size of main trunk sewer six feet, size of outlets connecting with same Is inch, 24 inch, 36 inch. Where new sewers are being laid, the double system has been adapted as per State law.
 Under the new system, surface wa ter sewers average in size from 10 inches to 40 inches and sanitary sew CTS at the extreme end eight inches for a short distance until connections from cross streets are added, then 10 inches, 12 inches, "A inches, 27 in ches, and 36 inches.
 Their pumping station costs $49,- 00O.00 to run annually. We wonder about these former conditions and also wonder how so much sewerage could be emptled into so small a stream or water as the Blackstone River, with out creating epidemics-but the won der is not so great when we also know by actual tests, that there IS only one gallon of sludge to 24,445 gallons of sewerage.
 In Boston.
 F. A. McInnis, Engineer The pop ulation of Boston was about 500,0O0 before any change was proposed in their com bination sewer system and now is about 680,0OO population. Some years ago commencing 1903, the State of Massa chusetts commenced to build trunk sewers miles inland along the sides of certain rivers. To fur nish connections for sewer outlets for different municipalities, any city pay ing ne-twentieth of the cost to the meeting their sewer outlets to this trunk sewer system. This system takes in a part of the Charles River section in Boston, where it is called the metropolitan district.
 A dam was built across the Charles River creating a large body of water into which the surface water sewer age is drained from this metropolitan district. The sewerage from the into the harbor. This metropolitan system takes in the low lying ground adjacent to the Charles River sec ton. It does not take in old Boston Old Boston is using the combined sewer system the same to-day as it always has done. This com bined sewerage is pumped to the top of hill bordering on the bay, then by gradual grade, carried to Moon Is- land, where it is stored until such time as it can be released and dis f,-ih tod iy,f@ IL