﻿690 
  NEW 
  YORK 
  STATE 
  MUSEUM 
  

  

  of 
  ground 
  water 
  in 
  about 
  fifteen 
  hundred 
  wells 
  included 
  in 
  1000 
  

   square 
  miles 
  of 
  territory. 
  

  

  At 
  a 
  test 
  of 
  the 
  old 
  driven- 
  well 
  plant 
  at 
  Spring 
  creek, 
  made 
  from 
  

   October 
  22 
  to 
  November 
  20, 
  1894, 
  water 
  was 
  pumped 
  at 
  an 
  average 
  

   rate 
  of 
  4,091,551 
  gallons 
  in 
  24 
  hours. 
  The 
  elevation 
  of 
  the 
  under- 
  

   side 
  of 
  the 
  discharge 
  valve 
  of 
  the 
  pump 
  was 
  12.3 
  feet 
  above 
  datum. 
  

   On 
  October 
  22, 
  at 
  the 
  beginning 
  of 
  the 
  tests, 
  the 
  average 
  elevation 
  

   of 
  the 
  water 
  in 
  the 
  wells 
  was 
  4 
  feet 
  below 
  datum. 
  The 
  quantity 
  

   pumped 
  in 
  24 
  hours, 
  on 
  October 
  22, 
  was 
  4,488,275 
  gallons. 
  On 
  

   November 
  20, 
  the 
  date 
  of 
  the 
  conclusion 
  of 
  the 
  test, 
  the 
  elevation 
  

   of 
  water 
  in 
  wells 
  was 
  7.7 
  feet 
  below 
  datum, 
  and 
  the 
  quantity 
  

   pumped 
  on 
  that 
  day 
  in 
  24 
  hours 
  was 
  4,112,663 
  gallons. 
  The 
  total 
  

   quantity 
  pumped 
  during 
  the 
  entire 
  period 
  from 
  October 
  22 
  to 
  

   November 
  20 
  was 
  122,746,525 
  gallons. 
  The 
  taking 
  of 
  this 
  quantity 
  

   of 
  water 
  from 
  the 
  wells 
  resulted, 
  therefore, 
  in 
  lowering 
  the 
  ground 
  

   water 
  a 
  total 
  of 
  3.7 
  feet. 
  

  

  A 
  new 
  driven- 
  well 
  plant 
  at 
  Watts 
  pond 
  was 
  subjected 
  to 
  a 
  test 
  

   of 
  capacity 
  extending 
  continuously 
  from 
  January 
  3 
  to 
  February 
  2, 
  

   inclusive. 
  In 
  1895 
  a 
  rather 
  extended 
  series 
  of 
  tests 
  were 
  made 
  

   of 
  a 
  number 
  of 
  the 
  wells 
  of 
  the 
  Brooklyn 
  water 
  supply 
  in 
  order 
  

   to 
  determine 
  the 
  yield 
  as 
  well 
  as 
  the 
  extent 
  of 
  the 
  underground 
  

   supply. 
  The 
  following 
  particulars 
  of 
  these 
  tests 
  have 
  been 
  derived 
  

   from 
  Mr 
  De 
  Varona's 
  report, 
  as 
  contained 
  in 
  the 
  annual 
  report 
  

   of 
  the 
  commissioner 
  of 
  city 
  works 
  for 
  the 
  year 
  1895. 
  

  

  The 
  flowing 
  wells 
  at 
  Jameco 
  were 
  tested 
  from 
  January 
  3 
  to 
  14, 
  

   inclusive. 
  During 
  this 
  period 
  the 
  wells 
  were 
  operated 
  singly 
  and 
  

   in 
  groups 
  of 
  2, 
  3, 
  and 
  4, 
  in 
  all 
  possible 
  combinations, 
  and 
  observa- 
  

   tions 
  were 
  taken 
  to 
  determine 
  the 
  elevation 
  of 
  the 
  ground 
  water. 
  

   Upon 
  completion 
  of 
  the 
  tests 
  a 
  series 
  of 
  observations 
  was 
  taken, 
  

   extending 
  to 
  January 
  30, 
  to 
  determine 
  the 
  normal 
  water 
  level. 
  

   It 
  was 
  shown 
  that 
  the 
  average 
  yield 
  from 
  one 
  well 
  alone 
  was 
  

   only 
  1,000,000 
  gallons 
  daily, 
  decreasing 
  pro 
  rata 
  up 
  to 
  a 
  total 
  

   yield 
  of 
  3,500,000 
  gallons 
  daily 
  when 
  four 
  wells 
  were 
  in 
  

   operation. 
  The 
  lowering 
  of 
  the 
  ground 
  water 
  was 
  approxi- 
  

   mately 
  5 
  feet 
  when 
  pumping 
  1,000,000 
  gallons, 
  increasing 
  up 
  to 
  

   approximately 
  10 
  feet 
  when 
  pumping 
  at 
  the 
  full 
  capacity 
  developed 
  

   of 
  3,500,000 
  gallons. 
  In 
  this 
  connection 
  it 
  is 
  stated 
  that 
  the 
  water 
  

   in 
  these 
  test 
  wells 
  is 
  found 
  to 
  rise 
  and 
  fall 
  directly 
  with 
  the 
  tide, 
  

   thus 
  rendering 
  it 
  difficult 
  to 
  state 
  with 
  accuracy 
  the 
  full 
  effect 
  of 
  

  

  