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Home My WebLink About2768 Report, Louis E. Hawes to Water Committee, April 7, 1902 /bUIS E. HAWES, f AND HYDRAULIC ENGINEER. ,1EMONT BUILDING. BOSTON, MASS. ..................Bo.s.t.o.L.l'......Mas-s.....,.......................................................... /i Apr 7. 1 ..... s902. Chairman Water Committee, Lexington, Mass. .. Dear Sir:- I have the pleasure of reporting that the work of T. Stuart & Son Co. , under contract of October 14, 1901 was completed April 4th and is now ready for the inspection of the Committee. Collecting Basin. The Collecting Basin has been in use since the last day of March at which time it, was full and overflowing, wells 6 and 7 being necessarily full to cause it, as no other water had access to collect ing basin at that time o The Collecting Basin when full holds 17 �� U` 6 gallons. To demonstrate the compensating value of the collecting basin in connection with wells 6 and 7 the quantity of water pumped during two dd�,Ts was determined when no other water was admitted to the basin. From 8:15 A.M. April 1, to 8:15 A.M. April 2, the estimated quantity pumped was 130,000 gallons drawing the water in the basin down only 1.7 feet and leaving I J �,2'1'5, gallons of water in the basin. From 8:15 A.h.'I. April 2, to 10: 08 A.M. April3, the quantity pumped as determined by counter records was 233,725 gallons, drawing the water down 7.7 feet and leaving j 7,G?� gallons still in the basin. During this day a small quantl,ty, about, 4,300 gallons ran into the basin from the deep well by gravity, which owing to no pumping having been done from it for some time, acts like an artesian well, the water rising about five feet higher than high water in ,� well 1. Tis water constituted the town' s supply for the two daNTs. r 41 As the lift from the collecting basin is less than from well- 1 and the stored water will enable pumping snore regularly-) there should result a considerable saving of" .fuel in making steam. Before the collecting basin ,ras placed in cornmissior_ while plastering and concrete was hardenin7-, it remained empty- and such small. leaks as appeared were stopped until now the basin is practic- r al1VT tight. During this time the structure received as severe a test as ever possible. A rain storm filled the trench outside the basin walls, before the trench had been filled with earth, until eater stood even with the surface of the ground and from six to ten feet deep, creating a pressure of mangy. tons upon the sides and bottom of the basin, not-withstanding- which no rupt.,re occurred and the two small leaks which appeared were successfully stopped. I consider the operation of wells e and 7 and the additional together with the collecting basin supply- obtained from therms entirely- successful, requiring now only- proper handling to obtain satisfactory results. The connection be- tween the reservoir conduit line and well 1 was not plugged as in- tended� the eater being too high in the well to permit it. The Superintendent should arrange to do this however, as soon as possi= ble. Driven Well The two weeks pumping test on the driven well s-vstem began on March 24 and has continued day and night since with but slight in- terruptions. Up to Saturday- night April 5th, a period of 12 days i and 1-1/2 hours 1,�52.,193 gallons had been pumped, or at the rate of 121,679 gallons a day-. This water was pumped into well No. 2 dist- ant about 7 U o feet from the pipe wells. - 3 - The rate of flow is constant no appearance of diminishing ap- pearing as yet. An interesting fact in connection with this constant pumping is that not; until the lOth day did the large spring near the wells ap- pear to be affected. l Since that day the flow from the spring has gradually diminish- ed. As the pipe wel S take water from beneath a bed of clay this fact, indicates that the spring is supplied by a strata above the clay and the connection between the two is somewhat remote. In addition to connecting up the driven well system in a per- manent manner with the present suction pipe which passes �n� S would strongly urge the necessit-,, of cleaning of-It the old wells 1� 2� 3, and 4 and taking such measures as necessary to prevent the en- trance of highly colored water which now gets in, as otherwise the benefits to be derived from. the new collecting basin and wells will be nullified when it is necessary to draw from the old wells. Very re spe ct f illy., � � � Z4� i �. e ti. .�..� ,_ ., .;.� ` .. _.... ._... � _rf,_ _.. _ .. i .. 1