1929-04-15-ATM-MIN - Laserfiche WebLink

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294 Ct cD the pool in a day , there should be 6 , 000 gal . of clean water supplied during this time and in order that the provision of clean water should be made when needed , it should be turned into the pool during the hours of use , presumably not over a 10-hr . period in the day . In other words , the rate of supply during 10 hr . might be about 14 , 400 gal . per Thg61 hr . With regard to the (_ivantity required for a wading pool there does riot appear to be any accepted standard . We assume that 1 , 000 gal . of clean water for each 40 users would be adequate , which would mean a minimum demand of 2 , 000 g . p . d . ( Gallons per day) during the hours of use , or a possible rate of 4 , 800 g . p . d . The total demand rate for both pools might , therefore , be about 19, 200 gal . or say 20 , 000 g . p . d . Avaiiable Water Supply . The obvious source for water supply is the so-called collecting well near the old pumping station off Lincoln Street which is fed by a pipe from a spring some distance away . Ihie collecting well is said to be tight and is approximately 48 ft . in diameter and probably 8 ft . or more in depth . Water overflows from it into the upturned end of a 4-in . cast iron pipe . The approximate rate of overflow as observed today is equivalent to about 51000 gal . in 24 hr . arid Mr . Garrity states that judging by appearances , the rate remains nearly constant at all seasons of the year . It appears , therefore , that a sufficient supply of water is available at the collecting well for the needs of the swimming and wading pools , even if the water were allowed to flow through the pools continuously at the normal rate of overflow from the collecting basin . A considerably larger available supply could probably be obtained by regulating a valve so as to shut off much of the flow during the night hours . It would be possible by drawing down the water in the collecting basin to utilize the entire ? 5 , 030 gal . in a period of 10 or 12 hr . , or at a rate approximating 50 , 000 g . p . d . Supply Pipe . There is now in the ground an old 8-in . cast iron pipe extending from x ell No . 1 in the rear of the pumping station to a point in the playground near the site of the proposed swimming pool , a distance of about 1300 ft . There is also a 4-in . pipe extending from the collecting basin to well No . 1 . It would be a simple matter to lay a short piece of pipe connecting these two pipes near well No . 1 , so that water could be drawn through them from the collecting basin without entering well No . 1 . The elevation of the overflow in the collecting basin is 216 . 8 . The elevation of the ground surface in the play- ground is about 214 and the elevation of the cater in the swimming pool would naturally be about 213 . There is , therefore , a difference in elevation of about 3 . 8 ft . to cause flow from the collecting basin to the swimming pool . For a rate of flow of 20 , 000 g . p . d . , the velocity in the 8- in . pipe would be about 0 . 1 ft . per second and the loss of head due to friction would be hardly measurable . It would , therefor , be necessary to throttle a valve on the pipe to maintain water in the collecting basin at its normal elevation , otherwise it would be drawn down to substantially the elevation of the water in the swimming pool and the overflow running to waste would be from the swimming pool rather than the collecting basin .