﻿HYDROLOGY 
  OF 
  NEW 
  YORK 
  425 
  

  

  the 
  valleys 
  are 
  narrow, 
  with 
  steep 
  slopes, 
  accordingly 
  rendering 
  

   it 
  impossible 
  for 
  large 
  quantities 
  of 
  water 
  to 
  be 
  stored. 
  

  

  So 
  far 
  as 
  known, 
  aside 
  from 
  Black 
  river, 
  Kaquette 
  river 
  and 
  one 
  

   or 
  two 
  others 
  in 
  this 
  State, 
  there 
  are 
  no 
  rivers 
  anywhere 
  on 
  which 
  

   the 
  task 
  assigned 
  to 
  the 
  Koman 
  river 
  conservancy 
  commission 
  

   could 
  be 
  successfully 
  applied. 
  On 
  Black 
  river 
  it 
  is 
  not 
  difficult 
  to 
  

   construct 
  a 
  single 
  reservoir, 
  which 
  practically 
  controls 
  1889 
  

   square 
  miles 
  of 
  catchment 
  area. 
  The 
  Raquette 
  river 
  can 
  also 
  

   be 
  thus 
  controlled 
  by 
  a 
  single 
  dam 
  at 
  Tupper 
  lake. 
  If 
  it 
  were 
  

   not 
  for 
  the 
  location 
  of 
  towns 
  near 
  the 
  water 
  level, 
  the 
  Seneca 
  

   river 
  could 
  be 
  controlled 
  by 
  a 
  series 
  of 
  dams 
  at 
  the 
  foot 
  of 
  the 
  

   Finger 
  Lakes. 
  

  

  River 
  regulation 
  on 
  the 
  Seine. 
  The 
  Seine 
  is 
  the 
  most 
  important 
  

   river 
  of 
  France, 
  not 
  only 
  on 
  account 
  of 
  its 
  being 
  the 
  highway 
  for 
  

   a 
  flourishing 
  inland 
  trade, 
  but 
  in 
  consequence, 
  of 
  engineering 
  works 
  

   which 
  have 
  been 
  earned 
  out 
  for 
  its 
  improvement. 
  On 
  this 
  stream, 
  

   the 
  same 
  as 
  on 
  others, 
  the 
  occurrence 
  of 
  high 
  floods 
  is 
  due 
  to 
  the 
  

   concentration 
  of 
  the 
  rainfall 
  at 
  special 
  periods 
  of 
  the 
  year. 
  The 
  

   rainfall 
  is 
  considerably 
  greater 
  in 
  the 
  summer 
  than 
  in 
  the 
  winter 
  

   months, 
  but 
  owing 
  to 
  evaporation 
  the 
  rains 
  of 
  summer 
  have 
  com- 
  

   paratively 
  little 
  influence 
  upon 
  the 
  flow 
  of 
  the 
  river, 
  although 
  a 
  

   heavy 
  rain 
  during 
  the 
  winter 
  months 
  falling 
  upon 
  a 
  saturated 
  

   soil, 
  when 
  evaporation 
  is 
  inactive, 
  causes 
  a 
  flood 
  of 
  which 
  the 
  

   hight 
  depends 
  upon 
  the 
  amount 
  of 
  saturation 
  of 
  the 
  basin 
  by 
  

   previous 
  rains 
  and 
  the 
  duration 
  of 
  the 
  rainfall. 
  Daily 
  readings 
  

   of 
  the 
  hight 
  of 
  the 
  river 
  have 
  been 
  kept 
  at 
  Paris 
  since 
  1732. 
  

   During 
  this 
  time, 
  thirty-one 
  ordinary 
  floods, 
  twelve 
  extraordinary, 
  

   and 
  two 
  exceptional 
  floods, 
  in 
  December, 
  1740, 
  and 
  in 
  January, 
  

   1802, 
  have 
  occurred. 
  A 
  list 
  is 
  also 
  given 
  of 
  five 
  exceptional 
  floods 
  

   occurring 
  between 
  1649 
  and 
  1732. 
  In 
  1658 
  a 
  severe 
  flood 
  followed 
  

   the 
  breaking 
  up 
  of 
  the 
  ice 
  in 
  the 
  river 
  after 
  severe 
  cold 
  weather 
  

   lasting 
  five 
  weeks. 
  Of 
  the 
  forty-five 
  large 
  floods 
  recorded 
  since 
  

   the 
  commencement 
  of 
  the. 
  daily 
  observations 
  in 
  1732 
  only 
  three 
  

   occurred 
  in 
  the 
  warm 
  season, 
  two 
  of 
  them 
  appearing 
  in 
  the 
  month 
  

   of 
  May 
  and 
  one 
  in 
  the 
  month 
  of 
  September. 
  The. 
  foregoing 
  shows 
  

   that 
  regular 
  floods 
  of 
  the 
  Seine 
  at 
  Paris 
  are 
  almost 
  wholly 
  con- 
  

   fined 
  to 
  the 
  cold 
  season. 
  1 
  

  

  lTbe 
  River 
  Seine, 
  by 
  L. 
  F. 
  Yernon-Harcourt, 
  Proc. 
  Inst. 
  C. 
  E., 
  Vol. 
  

   LXXXIV, 
  p. 
  210. 
  

  

  