﻿HYDROLOGY 
  OF 
  NEW 
  YORK 
  301 
  

  

  Milwaukee, 
  the 
  eastern 
  line 
  being 
  for 
  the 
  entire 
  distance 
  nearly 
  

   parallel 
  to 
  Lake 
  Michigan 
  and 
  in 
  places 
  only 
  2 
  or 
  3 
  miles 
  distant 
  

   therefrom. 
  The 
  area 
  drained 
  by 
  the 
  Desplaines 
  river 
  is 
  large 
  

   enough 
  to 
  give 
  a 
  fair 
  idea 
  of 
  the 
  average 
  yield 
  of 
  streams 
  tribu- 
  

   tary 
  to 
  Lake 
  Michigan 
  in 
  northern 
  Illinois 
  and 
  Indiana, 
  western 
  

   Michigan, 
  and 
  southern 
  and 
  central 
  Wisconsin. 
  In 
  1893, 
  with 
  a 
  

   mean 
  rainfall 
  on 
  the 
  catchment 
  area 
  of 
  39.96 
  inches, 
  the 
  total 
  

   runoff 
  was 
  10.14 
  inches, 
  of 
  which 
  8.61 
  inches 
  occurred 
  during 
  the 
  

   storage 
  period 
  from 
  December 
  to 
  May, 
  inclusive. 
  In 
  1894, 
  with 
  

   a 
  total 
  rainfall 
  of 
  27.94 
  inches, 
  the 
  total 
  runoff 
  was 
  7.70 
  inches, 
  

   of 
  which 
  7.54 
  inches 
  occurred 
  in 
  the 
  storage 
  period. 
  For 
  the 
  year 
  

   1895 
  the 
  total 
  rainfall 
  was 
  27.28 
  inches. 
  The 
  runoff 
  data 
  of 
  this 
  

   year 
  are 
  incomplete, 
  but 
  taking 
  into 
  account 
  the 
  sequence 
  of 
  the 
  

   rainfall 
  it 
  is 
  clear 
  that 
  the 
  total 
  runoff 
  for 
  that 
  year 
  did 
  not 
  

   exceed 
  about 
  2.0 
  to 
  2.5 
  inches. 
  The 
  effect 
  of 
  the 
  three 
  dry 
  years 
  

   1893, 
  1894, 
  and 
  1895 
  in 
  the 
  Desplaines 
  catchment 
  area 
  is 
  shown 
  

   by 
  the 
  record 
  of 
  1896, 
  where, 
  with 
  a 
  total 
  rainfall 
  of 
  39.58 
  inches, 
  

   the 
  total 
  runoff 
  was 
  only 
  6.69 
  inches, 
  of 
  which 
  5.39 
  inches 
  oc- 
  

   curred 
  in 
  the 
  storage 
  period. 
  These 
  figures 
  indicate 
  that 
  the 
  

   ground 
  water 
  of 
  the 
  Desplaines 
  area 
  must 
  have 
  been 
  so 
  low 
  at 
  

   the 
  end 
  of 
  1895 
  as 
  to 
  absorb 
  a 
  large 
  portion 
  of 
  the 
  heavier 
  rainfall 
  

   of 
  1896 
  before 
  any 
  great 
  amount 
  could 
  appear 
  as 
  runoff. 
  1 
  

  

  *For 
  details 
  of 
  the 
  measurements 
  of 
  the 
  Desplaines 
  river 
  see 
  Data 
  Per- 
  

   taining 
  to 
  Rainfall 
  and 
  Stream 
  Flow, 
  by 
  Thomas 
  T. 
  Johnston, 
  Journal 
  

   Western 
  Soc. 
  0. 
  E., 
  Vol. 
  I 
  (June, 
  1896). 
  

  

  