﻿128 
  

  

  NEW 
  YORK 
  STATE 
  MUSEUM 
  

  

  column 
  (1) 
  in 
  the 
  following 
  tabulation. 
  Since 
  the 
  water 
  surface 
  

   area 
  is 
  20 
  square 
  miles, 
  it 
  becomes 
  20/5828 
  of 
  the 
  whole, 
  or 
  1/292. 
  

   Hence 
  water 
  surface 
  evaporation 
  is 
  1/292 
  or 
  10 
  inches, 
  and 
  mak- 
  

   ing 
  the 
  computation 
  for 
  each 
  month, 
  we 
  have 
  the 
  quantities 
  as 
  

   per 
  column 
  (2) 
  : 
  

  

  Total 
  evaporation 
  and 
  evaporation 
  per 
  square 
  mile 
  or 
  water 
  surface 
  in 
  

  

  Muskingum 
  basin 
  

  

  Month 
  

  

  January 
  .. 
  

   February 
  . 
  

   March 
  . 
  . 
  . 
  

   April 
  .... 
  

  

  May 
  

  

  June 
  

  

  July 
  

  

  August 
  . 
  . 
  

   September 
  

   October 
  . 
  . 
  

   November 
  

   December 
  

  

  

  Evapora- 
  

   tion 
  

  

  Total 
  

   evapora- 
  

   tion 
  

  

  per 
  square 
  

  

  mile 
  of 
  

   water 
  sur- 
  

   face 
  

  

  1.00 
  

  

  0.0034 
  

  

  1.10 
  

  

  .0037 
  

  

  1.70 
  

  

  .0058 
  

  

  3.00 
  

  

  .01029 
  

  

  4.60 
  

  

  .01578 
  

  

  5.65 
  

  

  .01938 
  

  

  6.10 
  

  

  .02092 
  

  

  5.60 
  

  

  .01921 
  

  

  4.15 
  

  

  .01423 
  

  

  3.35 
  

  

  .01149 
  

  

  2.25 
  

  

  .00772 
  

  

  1.50 
  

  

  .00514 
  

  

  40.00 
  

  

  With 
  some 
  allowance 
  for 
  percolation, 
  leakage, 
  etc. 
  the 
  total 
  is 
  

   taken 
  at 
  0.40 
  of 
  an 
  inch 
  per 
  year. 
  Analyzing 
  the 
  first 
  period, 
  we 
  

   find 
  that 
  for 
  24 
  months 
  there 
  was 
  an 
  average 
  flow 
  of 
  0.76 
  inch 
  

   per 
  month, 
  for 
  12 
  months 
  an 
  average 
  flow 
  of 
  0.67 
  inch, 
  and 
  for 
  

   9 
  months 
  an 
  average 
  flow 
  of 
  0.43 
  inch. 
  

  

  The 
  second 
  low-water 
  period 
  was 
  from 
  May, 
  1891, 
  to 
  January, 
  

   1893, 
  inclusive, 
  a 
  period 
  of 
  21 
  months, 
  during 
  which 
  time 
  the 
  net 
  

   runoff 
  was 
  17.2 
  inches, 
  yielding 
  for 
  the 
  whole 
  21 
  months 
  an 
  aver- 
  

   age 
  of 
  0.82 
  inch 
  and 
  for 
  7 
  months 
  an 
  average 
  of 
  0.36 
  inch. 
  

  

  The 
  most 
  extreme 
  low-water 
  period 
  was 
  from 
  April, 
  1894, 
  to 
  

   November, 
  1895, 
  inclusive, 
  a 
  period 
  of 
  20 
  months, 
  during 
  which 
  

  

  