﻿202 
  NEW 
  YORK 
  STATE 
  MUSEUM 
  

  

  taken. 
  But, 
  unfortunately, 
  owing 
  to 
  negative 
  evaporation 
  in 
  the 
  

   storage 
  period, 
  the 
  individual 
  months 
  of 
  that 
  period 
  were 
  too 
  dis- 
  

   cordant 
  for 
  publication. 
  The 
  writer, 
  therefore, 
  does 
  not 
  give 
  

   any 
  such 
  diagrams 
  in 
  this 
  connection. 
  His 
  present 
  view 
  is 
  that, 
  

   for 
  the 
  reason 
  stated, 
  they 
  can 
  not 
  be 
  safely 
  used. 
  

  

  One 
  or 
  two 
  general 
  conclusions 
  of 
  some 
  interest 
  may 
  be 
  drawn 
  

   from 
  figs. 
  11 
  to 
  13, 
  inclusive. 
  Taking 
  the 
  extreme 
  low 
  water 
  as 
  

   represented 
  by 
  the 
  year 
  1895, 
  on 
  Muskingum 
  river, 
  at 
  4.9 
  inches 
  

   for 
  the 
  whole 
  year, 
  with 
  a 
  rainfall 
  of 
  29.8 
  inches, 
  it 
  is 
  interesting 
  

   to 
  observe 
  that 
  in 
  the 
  preceding 
  year 
  of 
  1894, 
  there 
  was 
  a 
  total 
  

   runoff 
  of 
  8.7 
  inches, 
  with 
  a 
  total 
  rainfall 
  of 
  30.5 
  inches. 
  That 
  is 
  

   to 
  say, 
  the 
  rainfall 
  for 
  the 
  year 
  1894 
  was 
  0.7 
  inch 
  greater 
  than 
  

   in 
  1895, 
  but 
  the 
  runoff 
  was 
  3.8 
  inches 
  greater. 
  This 
  extreme 
  

   difference 
  may 
  be 
  ascribed 
  to 
  the 
  difference 
  in 
  the 
  night 
  of 
  ground 
  

   water. 
  In 
  1895 
  ground 
  water 
  stood 
  much 
  lower 
  than 
  in 
  1893, 
  

   with 
  the 
  result 
  of 
  a 
  lower 
  runoff. 
  

  

  On 
  fig. 
  11, 
  for 
  the 
  Genesee 
  river, 
  with 
  a 
  precipitation 
  of 
  30 
  

   inches, 
  the 
  runoff 
  is 
  found 
  to 
  be 
  6 
  inches, 
  while 
  on 
  fig. 
  8, 
  with 
  a 
  

   precipitation 
  of 
  30 
  inches, 
  runoff 
  ordinarily 
  may 
  be 
  expected 
  to 
  

   be 
  about 
  8 
  inches. 
  This 
  statement 
  is 
  made 
  on 
  the 
  assumption 
  

   that 
  the 
  curve 
  is 
  drawn 
  in 
  a 
  mean 
  position, 
  or 
  in 
  such 
  a 
  way 
  as 
  

   to 
  give 
  average 
  mean 
  results, 
  but 
  it 
  should 
  not 
  be 
  overlooked 
  that 
  

   Muskingum 
  river 
  observations 
  are 
  too 
  few 
  to 
  draw 
  absolute 
  con- 
  

   clusions. 
  The 
  diagram, 
  fig. 
  12, 
  shows 
  that 
  there 
  is 
  some 
  lack 
  of 
  

   accuracy 
  in 
  at 
  least 
  one-half 
  of 
  them. 
  

  

  Fig. 
  1.1 
  shows 
  that 
  on 
  Hudson 
  river, 
  if 
  during 
  any 
  year 
  the 
  total 
  

   rainfall 
  should 
  sink 
  to 
  30 
  inches, 
  the 
  runoff 
  may 
  be 
  expected 
  to 
  

   be 
  somewhat 
  less 
  than 
  10 
  inches, 
  though 
  the 
  modifying 
  effect 
  of 
  

   full 
  or 
  low 
  ground 
  water 
  may 
  be 
  taken 
  into 
  account 
  in 
  reaching 
  

   such 
  conclusion. 
  Probably 
  there 
  would 
  be, 
  due 
  to 
  elevation 
  of 
  

   ground 
  water, 
  a 
  variation 
  of 
  perhaps 
  2 
  inches. 
  

  

  On 
  the 
  diagram 
  of 
  Croton 
  river, 
  fig. 
  13, 
  it 
  is 
  also 
  seen 
  that 
  30 
  

   inches 
  precipitation 
  may 
  be 
  expected 
  to 
  produce 
  a 
  little 
  less 
  than 
  

   7 
  inches 
  of 
  runoff, 
  showing 
  also 
  that 
  this 
  stream 
  has 
  substantially 
  

   the 
  characteristics 
  of 
  Genesee 
  river. 
  

  

  