The daily morning journal and courier., 1901-11-09

| VII consider Hrst the loss by eVapora- | ton.
 l The calculated annual evaporation | TOT New Haven district, as given by 1 the government authorities is as fol- l lows:
 | For January February March, April l and May, g 9-10 inches.
 For June, July, August and Septem-
 Der, IA 7-10 inches.
 l For October, November and Decem-
 Der, z 2-1O inches. Total for the year, 31 S-10 inches. We will assume that the lake would
 lose by evaporation from the first of June to the first of October (say 12O days) fifteen inches of it's surface. | This, over an area of 30 acres, would be 2O,4lS,750 gallons, allowing 1-2 gallons to the cubic foot.
 F'irst-The rainfall for the four months in question. The records of the weather bureau at New Haven show the annual rainfall in New Haven since 1872 to have varied from 60 26-100 inches down to 34 S3-100 inches, the lat ter being the amount during the ex- cessively dry year of 1900. The average rain fall during the summer months of June, July, August and September has varied in about the same proportion The average for the past ten years was
 l3 3S-100 inches In the whole period of
 2S years there have been but three in
 which the rainfall for those months
 was less than 12 inches; the least of all
 being in 1900, when it was only
 07-100 inches. In order to make our
 inquiry as rigid as possible, we will
 confine it to year in which the rain
 fall would be inches from June 1st to
 October 1st. It must be remembered
 that this means the rainfall over the
 area of the lake only, whereas that
 available for the water supply includes
 a water shed at least five times as
 great. Of course all surface water fall
 ing on this district would not flow into
 the lake, but a considerable part of it
 would, especially as two overflow sew
 CTS above Willow street will discharge
 into it the rainwater from the gutters
 of large district. It is probable, how
 ever that in a very dry season the
 evaporation would be greater than the
 average therefore we will not take into
 account the supply of surface water
 from the surrounding watershed, but
 let it offset the increased evaporation
 in very dry season, which is certainly
 a very liberal allowance.
 With an evapora ton therefore of 15
 inches and rainfall of seven inches
 during the dry summer months, if there were no other water supply, the lake would gradually subside through ,Lr,tl al,i. eight inches at the end of the season. Such a fall in level in a lake five feet deep would not be serious matter, especially as 1t would occur very rarely, and there is not the least danger that so large and deep body of water would become stagnant in four months. But there are other sources of supply besides the rainfall and it remains to inquire whether these sources can be relied on to supply the eight inches of evaporation in excess of the rainfall or, in other words, the 900 gallons which will be required to keep the lake at it's proper level. These additional sources have been carefully examined and their respective amounts estimat- ed by Gustav x. Amrhyn. general su- of parks, whose report is hereto attached, and are as follows:
 A second source of supply will be found in the leakage of the Whitney dam. As these leakages have existed ] for more than forty years and all ef- l forts of the water company to stop | them have proved unsuccessful, they | are not likely to be materially dimin- | ished hereafter. The quantity of water | flowing through them was determined | by MT. Amrhyn with especial care and | Is reported by him to be at least 270 | gallons per minute or 3.S2S,0O0 gallons | In "A hours. This in 120 days would | amount to 46,656,0O0 gallons, or much more than three times the 12,S90000 l gallons net loss by evaporation. Even If we make liberal discount from MT. Amrhyn's estimate, it is evident that the supply from these leakages alone must largely oyerbalance any possible oss by evaporation in any possible drought The supply moreover would oe, like the evaporation, continuous, so that there is no reason to believe that he loss by evaporation would be dis at any time. On the contrary he lake ought to show even through he worst drought an overflow at its outlet; and in ordinary seasons this overflow would be considerable, espec- ally when we take into account the ad- litional sources of supply, which re- main to be noticed.
 Third, The third source of supply to he lake will be found, not in surplus water which would go over the dam, because in such a dry season as we are low assuming very little, if any, water would thus go to waste, but in that which goes through it to run the water wheels of the New Haven Water com ,any and the Winchester Arms compa- ly. The use of these wheels is affected ,y droughts, but even during the sum- ner of 1900, they were both run to some xtent That of the New Haven Wa CT company was run twelve days be- ween June i and October 1. and that f the Winchester Arms company twenty-five days during June, July and August. The quantity of water used y the Water company wheel is over hree and oIle-half million of gallons er day, and that of the Winchester ompany about the same Hence if ither of these wheels was run for only ne day during each month between lay and October, this alone would 1ore than suffice to keep the lake even ull without any other supply whatev- r. There is little doubt that even in ! he dryest season, one or both of these