﻿HYDROLOGY 
  OF 
  NEW 
  YORK 
  131 
  

  

  On 
  comparing 
  these 
  two 
  streams, 
  as 
  per 
  the 
  foregoing 
  tabula- 
  

   tion, 
  it 
  appears 
  that 
  the 
  water 
  yields 
  are 
  quite 
  different. 
  In 
  

   searching 
  for 
  a 
  reason 
  for 
  the 
  difference 
  which 
  appears, 
  the 
  

   writer 
  assigns 
  as 
  a 
  principal 
  cause 
  the 
  difference 
  in 
  forestation, 
  

   the 
  Hudson 
  area 
  being 
  still 
  largely 
  in 
  forest, 
  while 
  the 
  Genesee 
  

   is 
  almost 
  totally 
  deforested 
  and 
  under 
  cultivation, 
  either 
  for 
  grain 
  

   farming 
  or 
  grazing. 
  

  

  By 
  way 
  of 
  still 
  better 
  comparing 
  the 
  rainfall, 
  runoff 
  and 
  

   evaporation 
  of 
  these 
  two 
  catchment 
  areas 
  the 
  following 
  tabulation 
  

   has 
  been 
  prepared 
  : 
  

  

  Comparison 
  of 
  rainfalls, 
  hudson 
  and 
  genesee 
  rivers 
  

  

  Rainfall 
  Rainfall 
  

   of 
  Hudson 
  of 
  Genesee 
  

   Year 
  area 
  area 
  Difference 
  

  

  1890 
  50.35 
  47.54 
  +2.81 
  

  

  1891 
  42.96 
  38.12 
  +4.84 
  

  

  1892 
  53.87 
  41.69 
  +12.18 
  

  

  1893 
  42.18 
  39.30 
  +2.88 
  

  

  1894 
  41.37 
  47.79 
  —6.42 
  

  

  1895 
  36.67 
  31.00 
  +5.67 
  

  

  1896 
  45.21 
  40.68 
  +4.53 
  

  

  1897 
  46.51 
  34.39 
  +12.12 
  

  

  1898 
  48.30 
  42.50 
  +5.80 
  

  

  Mean 
  45.27 
  40.33 
  +4.94 
  

  

  Comparison 
  of 
  runoffs, 
  hudson 
  and 
  genesee 
  rivers 
  

  

  Runoff 
  Runoff 
  

   v 
  of 
  Hudson 
  of 
  Genesee 
  

  

  xear 
  area 
  area 
  Difference 
  

  

  !890 
  28.56 
  21.22 
  +7.34 
  

  

  !891 
  20.56 
  14.05 
  +6.51 
  

  

  !892 
  33.08 
  15.42 
  +17.66 
  

  

  1893 
  21.91 
  13.35 
  +8.56 
  

  

  !894 
  19.37 
  19.38 
  —0.01 
  

  

  18 
  95 
  17.46 
  6.67 
  +10.79 
  

  

  !896 
  23.63 
  12.80 
  +10.83 
  

  

  1897 
  26.19 
  9.38 
  +16.81 
  

  

  !898 
  27.65 
  15.13 
  +12.52 
  

  

  Mean 
  ,.. 
  24.27 
  14.16 
  +10.11 
  

  

  