﻿HYDROLOGY 
  OP 
  NEW 
  YORK 
  

  

  689 
  

  

  of 
  water 
  pura>ped 
  was 
  equivalent 
  to 
  a 
  depth 
  of 
  1.44 
  inches 
  on 
  the 
  

   catchment, 
  or 
  3.82 
  per 
  cent 
  of 
  the 
  total 
  rainfall. 
  In 
  1896 
  the 
  

   total 
  rainfall 
  was 
  38.82 
  inches. 
  The 
  amount 
  of 
  water 
  pumped 
  

   during 
  that 
  year 
  would 
  cover 
  the 
  catchment 
  to 
  a 
  depth 
  of 
  11 
  

   inches, 
  this 
  being 
  over 
  28 
  per 
  cent 
  of 
  the 
  total 
  rainfall. 
  The 
  

   average 
  yield 
  as 
  obtained 
  by 
  pumping 
  was 
  0.81 
  cubic 
  foot 
  per 
  

   second 
  per 
  square 
  mile 
  of 
  catchment. 
  

  

  Table 
  Xo. 
  SS 
  — 
  Total 
  annual 
  rainfall, 
  per 
  cent 
  utilized, 
  and 
  average 
  

  

  YIELD 
  PER 
  SQUARE 
  MILE 
  OF 
  CATCHMENT 
  OF 
  BROOKLYN 
  WATERWORKS 
  

  

  YEAR 
  

  

  Rainfall 
  

  

  in 
  

   inches 
  

  

  Cubic 
  

   p 
  ; 
  feet 
  per 
  

  

  cent 
  se 
  ™ 
  nd 
  

  

  utilized 
  : 
  sr^are 
  

   mile 
  

  

  YEAR 
  

  

  Rainfall 
  

  

  in 
  

   inches 
  

  

  ' 
  Cubic 
  

   p 
  ! 
  feet 
  per 
  

  

  cent 
  se 
  ™f 
  

   utilized 
  ! 
  gq 
  ^ 
  re 
  

  

  mile 
  

  

  (1) 
  

  

  (2) 
  

  

  (3) 
  

  

  (4) 
  

  

  (1) 
  

  

  1879 
  

  

  j 
  1880 
  

  

  i 
  1881 
  

  

  1 
  1882 
  

  

  1883 
  

  

  1884 
  

  

  1885 
  

  

  1886 
  

  

  1887 
  

  

  1888 
  

  

  1889 
  

  

  1890 
  

  

  ' 
  1891 
  

  

  1892 
  

  

  i 
  1893 
  

  

  ; 
  1894 
  

  

  ; 
  1895 
  

  

  1896 
  ...... 
  

  

  (2) 
  

  

  (3) 
  (4) 
  

  

  1860 
  

  

  1861 
  

  

  1862 
  

  

  1863 
  

  

  1864 
  

  

  1865 
  

  

  1866 
  

  

  1867 
  

  

  1868 
  

  

  1869 
  

  

  1870 
  

  

  1871 
  

  

  1872 
  

  

  1873 
  

  

  1874 
  

  

  1875 
  

  

  1876 
  

  

  1877 
  

  

  1878 
  

  

  . 
  . 
  37.65 
  

   . 
  . 
  45 
  . 
  65 
  

   .. 
  38.02 
  

   . 
  . 
  32 
  . 
  76 
  

   .. 
  32.00 
  

   . 
  . 
  46.14 
  

   . 
  . 
  51.68 
  

   .. 
  54.61 
  

   . 
  . 
  38.58 
  

   . 
  . 
  43.13 
  

   . 
  . 
  39 
  . 
  25 
  

   . 
  . 
  51.26 
  

   . 
  . 
  39 
  . 
  75 
  

   . 
  . 
  47 
  . 
  99 
  

   .. 
  45.83 
  

   . 
  . 
  40.90 
  

   . 
  . 
  41 
  . 
  77 
  

   . 
  . 
  40.18 
  

   . 
  . 
  48.66 
  

  

  3.82 
  

  

  3.92 
  

  

  5 
  . 
  73 
  

  

  8.39 
  

  

  10.53 
  

  

  8.39 
  

  

  8.88 
  

  

  9.39 
  

  

  17.29 
  

  

  17.20 
  

  

  19.82 
  

  

  15.78 
  

  

  23.47 
  

  

  20.88 
  

  

  21.49 
  

  

  26.89 
  

  

  27.08 
  

  

  30.29 
  

  

  25.15 
  

  

  0.11 
  

   0.13 
  

   0.16 
  

   0.20 
  

   0.25 
  

   0.28 
  

   0.34 
  

   0.38 
  

   0.49 
  

   0.55 
  

   0.57 
  

   0.60 
  

   0.67 
  

   0.74 
  

   0.73 
  

   0.81 
  

   0.83 
  

   0.90 
  

   0.90 
  

  

  39.61 
  

   40.76 
  

   39.53 
  

   39.83 
  

   37 
  . 
  22 
  

   45.89 
  

   36.85 
  

   51.38 
  

   45 
  . 
  66 
  

   48.45 
  

   56.54 
  

   52.15 
  

   39.18 
  

   37.75 
  

   39.62 
  

   36.88 
  

   35.64 
  

   3S.S2 
  

  

  33.40 
  

   30.23 
  

   29.42 
  

   30.73 
  

   33.05 
  

   27.89 
  

   37.94 
  

   28.32 
  

   32.59 
  

   33.19 
  

   29.54 
  

   33.90 
  

   44 
  82 
  

   24.53 
  

   26.27 
  

   26.33 
  

   28.98 
  

   28.31 
  

  

  0.97 
  

   0.90 
  

   0.86 
  

   0.90 
  

   0.91 
  

   0.93 
  

   1.03 
  

   1.07 
  

   1.10 
  

   1.18 
  

   1.23 
  

   1.30 
  

   1.29 
  

   0.68 
  

   0.77 
  

   0.72 
  

   0.76 
  

   0.81 
  

  

  

  Generally 
  the 
  Brooklyn 
  Water 
  Works 
  have 
  not 
  been 
  so 
  designed 
  

   as 
  to 
  furnish 
  records 
  of 
  the 
  quantity 
  drawn 
  from 
  these 
  several 
  

   different 
  sources. 
  There 
  are 
  also 
  no 
  records 
  of 
  the 
  bights 
  of 
  the 
  

   ground 
  water 
  at 
  different 
  points 
  in 
  the 
  catchment 
  area. 
  If 
  such 
  

   were 
  to 
  be 
  kept 
  for 
  a 
  series 
  of 
  years, 
  the 
  records 
  of 
  the 
  Brooklyn 
  

   Water 
  Works 
  would 
  possess 
  a 
  value 
  not 
  easily 
  estimated. 
  They 
  

   would 
  give 
  a 
  far 
  more 
  positive 
  indication 
  of 
  the 
  amount 
  of 
  water 
  

   that 
  can 
  be 
  drawn 
  from 
  such 
  sandy 
  areas 
  than 
  can 
  now 
  be 
  gained 
  

   from 
  them. 
  A 
  few 
  tests, 
  however, 
  of 
  some 
  of 
  the 
  driven-well 
  

   plants 
  have 
  been 
  made 
  in 
  the 
  last 
  few 
  years. 
  The 
  Greater 
  New 
  

   York 
  Water 
  Supply 
  Commission 
  of 
  1903 
  has 
  measured 
  the 
  hight 
  

  

  