﻿NIAGARA 
  FALLS 
  AND 
  VICINITY 
  

  

  23 
  

  

  .64 
  feet 
  

  

  104.51 
  

  

  2.18 
  

  

  

  i( 
  

  

  1080 
  

  

  

  (( 
  

  

  1060 
  

  

  

  (< 
  

  

  2260 
  

  

  

  it 
  

  

  3010 
  

  

  

  Cl 
  

  

  32,900 
  

  

  sq. 
  

  

  ft 
  

  

  •755 
  

  

  acres 
  

  

  75,400 
  

  

  sq. 
  

  

  ft 
  

  

  6.Z2 
  

  

  acres 
  

  

  Mean 
  annual 
  recession 
  of 
  American 
  falls 
  between 
  

  

  1842 
  and 
  1890 
  

   Mean 
  total 
  recession 
  of 
  Horseshoe 
  falls 
  between 
  

  

  1842 
  and 
  1890 
  

   Mean 
  annual 
  recession 
  of 
  Horseshoe 
  falls 
  between 
  

  

  1842 
  and 
  1890 
  

   Length 
  of 
  crest 
  line 
  of 
  American 
  falls 
  in 
  1842 
  

  

  in 
  1890 
  

   " 
  Horseshoe 
  falls 
  

  

  in 
  1842 
  

   in 
  1890 
  

   Total 
  area 
  of 
  rock 
  surface 
  which 
  has 
  disappeared 
  

  

  at 
  the 
  American 
  falls 
  between 
  1842 
  and 
  1890 
  

   or 
  

   Total 
  area 
  of 
  rock 
  surface 
  which 
  has 
  disappeared 
  

  

  at 
  Horseshoe 
  falls 
  between 
  1842 
  and 
  1890 
  

   or 
  

  

  These 
  changes 
  are 
  graphically 
  shown 
  in 
  the 
  successive 
  crest 
  lines 
  

   of 
  the 
  Horseshoe 
  falls, 
  given 
  in 
  fig. 
  19, 
  p. 
  81. 
  

   Volume 
  of 
  vvater 
  passing 
  over 
  the 
  falls 
  each 
  

  

  minute^ 
  22,440,000 
  cu. 
  ft 
  

  

  or 
  1,402,500,000 
  pounds 
  

  

  or 
  more 
  than 
  7,000,000 
  tons 
  

  

  Depth 
  of 
  water 
  in 
  the 
  channel 
  of 
  Niagara 
  river 
  below 
  the 
  falls^i 
  

   {see 
  fig. 
  18) 
  

  

  At 
  foot 
  of 
  Horseshoe 
  falls 
  (center) 
  150 
  to 
  200 
  feet 
  

  

  Upper 
  Great 
  gorge, 
  from 
  the 
  falls 
  to 
  the 
  beginning 
  

  

  of 
  the 
  Whirlpool 
  rapids 
  (from 
  soundings) 
  160 
  to 
  190 
  " 
  

  

  Whirlpool 
  rapids 
  35 
  

  

  Whirlpool 
  150 
  " 
  

  

  Outlet 
  of 
  whirlpool 
  50 
  " 
  

  

  Opposite 
  Wintergreen 
  flat 
  35 
  

  

  Below 
  Foster's 
  flats 
  70 
  " 
  

  

  ^Blackwell, 
  Am. 
  jour. 
  sci. 
  1844, 
  46 
  : 
  6y. 
  

  

  ^Estimated 
  by 
  Gilbert. 
  Am. 
  geol. 
  1896, 
  18 
  : 
  232-33 
  and 
  elsewhere. 
  

  

  