﻿PREFACE 
  

  

  This 
  report 
  is 
  a 
  revision 
  of 
  Water 
  Supply 
  and 
  Irrigation 
  Papers 
  

   of 
  the 
  United 
  States 
  Geological 
  Survey, 
  Nos. 
  24 
  and 
  25 
  — 
  Water 
  

   Resources 
  of 
  the 
  State 
  of 
  New 
  York, 
  published 
  in 
  1899. 
  In 
  regard 
  

   to 
  calling 
  the 
  revised 
  report 
  the 
  Hydrology 
  of 
  New 
  York 
  rather 
  

   than 
  continuing 
  the 
  title 
  previously 
  given, 
  it 
  may 
  be 
  stated 
  that 
  

   the 
  information 
  has 
  been 
  considerably 
  extended 
  and, 
  while 
  it 
  is 
  

   true 
  that 
  it 
  still 
  pertains 
  to 
  the 
  water 
  resources 
  of 
  the 
  State, 
  it 
  

   seems 
  to 
  the 
  writer 
  that, 
  on 
  the 
  whole, 
  hydrology 
  better 
  expresses 
  

   the 
  meaning 
  than 
  does 
  the 
  former 
  title. 
  

  

  Broadly, 
  hydrology 
  may 
  be 
  denned 
  as 
  that 
  branch 
  of 
  physical 
  

   geography 
  treating 
  of 
  water, 
  and 
  it 
  is 
  in 
  this 
  sense 
  that 
  the 
  term 
  

   is 
  used 
  herein. 
  Physical 
  geography 
  is 
  an 
  exceedingly 
  elastic 
  

   term, 
  and 
  it 
  is 
  quite 
  as 
  proper 
  to 
  treat 
  of 
  the 
  effect 
  of 
  restrictive 
  

   laws 
  upon 
  the 
  development 
  of 
  the 
  State 
  as 
  to 
  treat 
  of 
  purely 
  

   political 
  divisions 
  in 
  an 
  ordinary 
  textbook 
  on 
  geography. 
  Any- 
  

   one 
  writing 
  upon 
  geography, 
  physiography, 
  hypsography, 
  geol- 
  

   ogy 
  or 
  hydrology 
  knows 
  that 
  the 
  lines 
  separating 
  these 
  several 
  

   divisions 
  are 
  not 
  very 
  closely 
  drawn 
  and 
  that 
  one 
  runs 
  into 
  the 
  

   other. 
  Physiography 
  treats 
  in 
  a 
  general 
  way 
  of 
  the 
  present 
  con- 
  

   dition 
  of 
  the 
  waters 
  of 
  the 
  earth, 
  while 
  geology 
  treats 
  in 
  some 
  

   degree 
  of 
  their 
  former 
  condition, 
  or 
  at 
  any 
  rate 
  of 
  the 
  effects 
  

   produced 
  by 
  water 
  in 
  a 
  former 
  condition. 
  It 
  is 
  quite 
  as 
  appro- 
  

   priate, 
  therefore, 
  for 
  the 
  State 
  Museum 
  to 
  publish 
  a 
  paper 
  on 
  the 
  

   hydrology 
  of 
  the 
  State 
  as 
  to 
  publish 
  those 
  relating 
  more 
  specially 
  

   to 
  geology. 
  

  

  What 
  may 
  be 
  termed 
  the 
  geologic 
  phase 
  of 
  the 
  physiography 
  

   of 
  New 
  York 
  has 
  been 
  treated 
  by 
  Professor 
  Tarr, 
  but 
  his 
  work 
  

   is 
  incomplete 
  in 
  this 
  — 
  it 
  does 
  not 
  treat 
  of 
  the 
  flow 
  of 
  streams. 
  

   This 
  report 
  is 
  intended 
  to, 
  in 
  some 
  slight 
  degree, 
  supplement 
  

   Professor 
  Tarr's 
  work. 
  Moreover, 
  hypsography 
  is 
  not 
  extensively 
  

   treated, 
  nor 
  is 
  hydrography. 
  Tides 
  and 
  their 
  effects, 
  etc. 
  are, 
  

   aside 
  from 
  a 
  short 
  reference 
  to 
  Hudson 
  river, 
  entirely 
  omitted. 
  

   Only 
  enough 
  geology 
  is 
  given 
  to 
  illustrate 
  the 
  subject. 
  

  

  