﻿

  

  HYDROLOGY. 
  OF 
  NEW 
  YORK 
  691 
  

  

  the 
  pumping 
  on 
  the 
  lowering 
  of 
  the 
  water. 
  To 
  determine 
  this 
  

   point 
  fully, 
  Mr 
  De 
  Varona 
  states, 
  would 
  require 
  a 
  more 
  prolonged 
  

   series 
  of 
  observations 
  than 
  it 
  was 
  possible 
  to 
  make 
  in 
  1895. 
  

  

  Another 
  test 
  was 
  made 
  at 
  Jameco 
  from 
  December 
  9 
  to 
  20, 
  1895, 
  

   inclusive. 
  Between 
  this 
  date 
  and 
  the 
  end 
  of 
  the 
  previous 
  tests 
  an 
  

   additional 
  well 
  had 
  been 
  sunk 
  at 
  Jameco 
  to 
  the 
  depth 
  of 
  160 
  feet. 
  

   The 
  average 
  daily 
  yield 
  shown 
  during 
  the 
  second 
  test 
  was, 
  approxi- 
  

   mately, 
  1,000.000 
  gallons 
  for 
  a 
  single 
  well, 
  with 
  a 
  proportionate 
  

   increase 
  for 
  each 
  well 
  connected, 
  the 
  yield 
  for 
  five 
  wells 
  being, 
  

   approximately, 
  5,000,000 
  gallons 
  in 
  24 
  hours. 
  The 
  lowering 
  or 
  

   the 
  water 
  during 
  those 
  tests 
  amounted 
  to 
  slightly 
  over 
  14 
  feet 
  at 
  

   Jameco 
  while 
  pumping 
  the 
  5,000,000 
  gallons 
  daily 
  from 
  the 
  five 
  

   wells. 
  The 
  total 
  amount 
  of 
  water 
  pumped 
  during 
  the 
  test 
  was 
  

   61,239,555 
  gallons. 
  The 
  greatest 
  lowering 
  of 
  the 
  underground 
  

   water 
  level 
  occurred 
  at 
  test 
  well 
  No. 
  8, 
  where 
  it 
  amounted 
  to 
  

   15.23 
  feet. 
  At 
  that 
  time, 
  when 
  the 
  water 
  at 
  Jameco 
  was 
  at 
  its 
  

   lowest 
  level, 
  the 
  fall 
  between 
  test 
  well 
  No. 
  8 
  and 
  test 
  well 
  No. 
  11 
  

   w 
  T 
  as 
  9.9 
  feet. 
  The 
  normal 
  water 
  level 
  was 
  not 
  restored 
  until 
  

   twelve 
  days 
  after 
  the 
  tests 
  had 
  ceased. 
  

  

  The 
  results 
  obtained 
  early 
  in 
  1895 
  from 
  the 
  test 
  made 
  at 
  Jameco 
  

   of 
  supplies 
  from 
  deep 
  wells 
  seemed 
  to 
  warrant 
  further 
  investiga- 
  

   tions 
  as 
  to 
  the 
  possibility 
  of 
  water 
  from 
  deep 
  wells, 
  and 
  the 
  report 
  

   states 
  that 
  they 
  have 
  been 
  carried 
  on 
  during 
  the 
  year. 
  A 
  series 
  

   of 
  test 
  wells 
  were 
  driven, 
  extending 
  from 
  the 
  foot 
  of 
  the 
  hill 
  at 
  

   Ridgewood 
  reservoir 
  to 
  Forest 
  stream 
  pumping 
  station, 
  each 
  well 
  

   being 
  carried 
  to 
  a 
  depth 
  sufficient 
  to 
  determine 
  the 
  possibility 
  of 
  

   obtaining 
  a 
  deep 
  supply 
  from 
  that 
  point. 
  The 
  number 
  of 
  those 
  

   wells 
  sunk 
  during 
  that 
  year 
  was 
  twelve, 
  and 
  the 
  records 
  of 
  the 
  

   strata 
  passed 
  through 
  are 
  given 
  in 
  Bulletin 
  No. 
  138, 
  referred 
  to 
  

   in 
  the 
  footnote. 
  1 
  

  

  Returning 
  to 
  table 
  No. 
  88, 
  it 
  may 
  be 
  stated 
  that 
  the 
  tributary 
  

   catchment 
  area 
  in 
  1875 
  was 
  52.3 
  square 
  miles. 
  The 
  catchment 
  

   area 
  remained 
  at 
  this 
  figure 
  until 
  January, 
  1881, 
  in 
  which 
  month, 
  

   by 
  the 
  bringing 
  of 
  the 
  Springfield 
  pumping 
  station 
  into 
  use, 
  it 
  was 
  

   increased 
  to 
  59 
  . 
  4 
  square 
  miles. 
  In 
  the 
  water 
  year 
  of 
  1875, 
  with 
  

   a 
  total 
  rainfall 
  of 
  41.6 
  inches, 
  the 
  water 
  utilized 
  amounted 
  to 
  

  

  "For 
  the 
  particulars 
  of 
  the 
  geology 
  of 
  several 
  of 
  the 
  Brooklyn 
  Water 
  

   Works 
  wells, 
  of 
  which 
  tests 
  were 
  made 
  in 
  1895, 
  see 
  Artesian- 
  Well 
  Prospects 
  

   in 
  the 
  Atlantic 
  Coastal 
  Plain 
  Region, 
  by 
  N. 
  H. 
  Darton 
  : 
  Bull. 
  U. 
  S. 
  Geol. 
  

   Survey 
  No. 
  138, 
  1896, 
  p. 
  23-37 
  

  

  