﻿HYDROLOGY 
  OF 
  NEW 
  YORK 
  403 
  

  

  A 
  comparison 
  of 
  the 
  gagings 
  at 
  Warrensburg 
  with 
  those 
  of 
  the 
  

   Hudson 
  river 
  at 
  Mechanicville 
  indicates 
  that 
  the 
  runoff 
  of 
  Schroon 
  

   river 
  is 
  considerably 
  greater 
  than 
  that 
  of 
  the 
  Hudson, 
  the 
  differ- 
  

   ence 
  occurring 
  mostly 
  in 
  the 
  storage 
  period. 
  This 
  is 
  probably 
  

   true, 
  although 
  some 
  uncertainty 
  attaches 
  to 
  the 
  gagings 
  at 
  War- 
  

   rensburg, 
  owing 
  to 
  an 
  increase 
  in 
  the 
  leakage 
  from 
  year 
  to 
  year. 
  

   The 
  writer 
  visited 
  Warrensburg 
  in 
  October, 
  1895. 
  At 
  that 
  time 
  

   the 
  pulp 
  mill 
  was 
  not 
  running, 
  and 
  due 
  to 
  the 
  fact 
  that 
  Starbuck- 
  

   ville 
  dam 
  was 
  closed 
  tightly 
  very 
  little 
  water 
  was 
  running 
  in 
  

   Schroon 
  river. 
  The 
  water 
  in 
  the 
  Warrensburg 
  dam 
  stood 
  about 
  

   4 
  feet 
  below 
  the 
  crest. 
  The 
  bed 
  of 
  Schroon 
  river 
  below 
  the 
  dam 
  

   was 
  very 
  nearly 
  dry, 
  the 
  flow 
  not 
  exceeding 
  one 
  to 
  two 
  cubic 
  

   feet 
  per 
  second. 
  The 
  writer 
  has 
  not 
  seen 
  this 
  dam 
  in 
  several 
  

   years, 
  but 
  reports 
  indicate 
  that 
  the 
  leakage 
  may 
  be 
  anywhere 
  

   from 
  30 
  to 
  50 
  cubic 
  feet 
  per 
  second. 
  

  

  When 
  the 
  flashboards 
  are 
  on, 
  the 
  computations 
  have 
  been 
  cal- 
  

   culated 
  by 
  means 
  of 
  Francis' 
  formula 
  for 
  sharp-crested 
  weir. 
  

   Without 
  the 
  flashboards, 
  the 
  quantities 
  are 
  taken 
  from 
  a 
  diagram 
  

   deduced 
  from 
  the 
  Cornell 
  University 
  experiments. 
  In 
  1902 
  this 
  

   mill 
  was 
  rebuilt. 
  

  

  Geologically 
  the 
  headwaters 
  of 
  this 
  stream 
  lie 
  in 
  the 
  horizon 
  

   of 
  the 
  Plutonic 
  norites 
  and 
  flow 
  across 
  the 
  unclassified 
  granites 
  

   and 
  gneisses. 
  

  

  Discharge 
  measurements 
  of 
  Mohatvk 
  river 
  at 
  Dunsbach 
  Ferry. 
  

   Mohawk 
  river 
  has 
  been 
  an 
  important 
  avenue 
  of 
  commerce 
  ever 
  

   since 
  the 
  early 
  settlement 
  of 
  the 
  country. 
  Nevertheless 
  very 
  

   little 
  was 
  known 
  as 
  to 
  the 
  water 
  yield 
  until 
  the 
  investigations 
  of 
  

   the 
  Board 
  of 
  Engineers 
  on 
  Deep 
  Waterways 
  in 
  1898-9. 
  The 
  

   writer 
  established 
  for 
  this 
  Board 
  gaging 
  stations 
  at 
  Ridge 
  Mills, 
  

   Little 
  Falls 
  and 
  Rexford 
  Flats. 
  The 
  station 
  at 
  Dunsbach 
  Ferry 
  

   was 
  established 
  in 
  March, 
  1898, 
  by 
  D. 
  J. 
  Howell. 
  At 
  present 
  

   gagings 
  over 
  dams 
  are 
  kept 
  at 
  Dunsbach 
  Ferry 
  and 
  Little 
  Falls, 
  

   while 
  gagings 
  by 
  current 
  meter 
  are 
  made 
  at 
  Schenectady 
  and 
  

   Utica. 
  

  

  The 
  Dunsbach 
  Ferry 
  record 
  is 
  kept 
  at 
  the 
  dam 
  of 
  the 
  West 
  Troy 
  

   Water 
  Company, 
  just 
  above 
  Dunsbach 
  Ferry 
  bridge, 
  nine 
  miles 
  

   from 
  the 
  mouth 
  of 
  the 
  river. 
  This 
  dam 
  is 
  in 
  two 
  sections, 
  on 
  

  

  