﻿322 
  NEW 
  YORK 
  STATE 
  MUSEUM 
  

  

  miles 
  in 
  the 
  province 
  of 
  Ontario. 
  The 
  standard 
  low-water 
  eleva- 
  

   tion 
  of 
  Lake 
  Ontario 
  is 
  taken 
  as 
  244.53 
  feet, 
  and 
  the 
  standard 
  

   high-water 
  elevation 
  as 
  249.04 
  feet 
  above 
  tide. 
  

  

  St 
  Lawrence 
  river 
  is 
  considered 
  as 
  beginning 
  at 
  Gallops 
  rapids. 
  

   The 
  following 
  tabulation 
  gives 
  the 
  elevation 
  of 
  water 
  surface 
  at 
  a 
  

   number 
  of 
  points. 
  1 
  

  

  Elevation 
  above 
  tide 
  op 
  low 
  t 
  -water 
  and 
  high-water 
  surface 
  

   op 
  St. 
  Lawrence 
  river 
  

  

  T^oi^r 
  Standard 
  low 
  Standard 
  high 
  

  

  locality 
  water. 
  water. 
  

  

  Feet 
  Feet 
  

  

  Ogdensburg 
  244.28 
  248.57 
  

  

  Lake 
  St 
  Francis, 
  at 
  Valleyfield 
  153 
  . 
  50 
  155 
  . 
  94 
  

  

  Lake 
  St 
  Louis, 
  at 
  Melicheville 
  70.0 
  77.50 
  

  

  Montreal 
  23.10 
  35.78 
  

  

  The 
  area 
  of 
  water 
  surface 
  of 
  the 
  St 
  Lawrence 
  from 
  Gallops 
  

   rapids 
  to 
  Montreal 
  is 
  220 
  square 
  miles, 
  and 
  the 
  total 
  area 
  of 
  

   catchment 
  not 
  included 
  in 
  the 
  surface 
  of 
  the 
  river 
  is 
  5710 
  square 
  

   miles, 
  of 
  which 
  3800 
  square 
  miles 
  lie 
  in 
  New 
  York, 
  620 
  in 
  Ontario, 
  

   and 
  1290 
  in 
  Quebec. 
  The 
  total 
  area 
  of 
  the 
  catchment, 
  including 
  

   water 
  surface 
  of 
  the 
  river, 
  is 
  5930 
  square 
  miles. 
  

  

  The 
  only 
  measurements 
  as 
  to 
  the 
  discharge 
  of 
  St 
  Lawrence 
  river 
  

   thus 
  far 
  made 
  are 
  those 
  of 
  the 
  Lake 
  Survey, 
  which 
  give 
  a 
  mean 
  

   discharge 
  of 
  300,000 
  cubic 
  feet 
  per 
  second. 
  The 
  recent 
  data 
  would 
  

   indicate 
  that 
  this 
  figure 
  is 
  somewhat 
  too 
  large, 
  as 
  in 
  the 
  Lake 
  

   Survey 
  discharge 
  of 
  Niagara 
  river. 
  The 
  streams 
  tributary 
  to 
  Lake 
  

   Ontario, 
  however, 
  issue 
  from 
  a 
  region 
  of 
  heavier 
  rainfall 
  than 
  

   those 
  tributary 
  to 
  the 
  Upper 
  Great 
  Lakes 
  and, 
  as 
  shown 
  by 
  the 
  

   runoff 
  tables 
  of 
  this 
  report, 
  are 
  generally 
  much 
  better 
  water 
  

   yielders. 
  Taking 
  everything 
  into 
  account, 
  it 
  is 
  probable 
  that 
  

   the 
  minimum 
  discharge 
  of 
  St. 
  Lawrence 
  river 
  will 
  not 
  be 
  less 
  

   than 
  about 
  8 
  to 
  10 
  inches 
  per 
  year 
  over 
  the 
  entire 
  catchment 
  area. 
  

   A 
  runoff 
  of 
  12 
  inches 
  per 
  year 
  would 
  give 
  a 
  mean 
  discharge 
  of 
  

   234,300 
  cubic 
  feet 
  per 
  second, 
  or 
  a 
  discharge 
  of 
  0.884 
  cubic 
  foot 
  

   per 
  second 
  per 
  square 
  mile. 
  A 
  mean 
  discharge 
  of 
  300,000 
  cubic 
  

  

  i 
  Report 
  of 
  U. 
  S. 
  Deep 
  Waterways 
  Commission, 
  1897, 
  p. 
  152. 
  

  

  