﻿49S 
  NEW 
  YORK 
  STATE 
  MUSEUM 
  

  

  Minimum 
  flow 
  of 
  Hemlock 
  lake. 
  According 
  to 
  a 
  report 
  made 
  

   by 
  Henry 
  Tracy/ 
  the 
  minimum 
  flow 
  of 
  Hemlock 
  lake 
  is 
  5 
  cubic- 
  

   feet 
  per 
  second 
  (catchment, 
  43 
  square 
  miles), 
  or 
  0.116 
  cubic 
  foot 
  

   per 
  second 
  per 
  square 
  mile. 
  

  

  Table 
  No. 
  49 
  gives 
  the 
  quantity 
  of 
  water 
  passing 
  out 
  of 
  Hem- 
  

   lock 
  lake 
  for 
  the 
  period 
  covered 
  and 
  without 
  reference 
  to 
  the 
  

   natural 
  flow. 
  In 
  order 
  to 
  obtain 
  the 
  approximate 
  natural 
  flow 
  

   for 
  the 
  year 
  we 
  must 
  take 
  into 
  account 
  the 
  mean 
  elevations 
  of 
  lake 
  

   surface. 
  Thus, 
  for 
  the 
  water 
  year 
  1880 
  the 
  mean 
  elevation 
  of 
  

   the 
  first 
  month, 
  December, 
  was 
  — 
  1.67, 
  while 
  for 
  the 
  last 
  month, 
  

   November, 
  it 
  was 
  — 
  1.24. 
  The 
  difference 
  (0.43 
  foot) 
  represents 
  

   the 
  gain 
  in 
  depth 
  of 
  storage 
  for 
  the 
  year. 
  Computing 
  for 
  the 
  

   value 
  of 
  this 
  storage 
  in 
  inches 
  on 
  the 
  catchment 
  area, 
  we 
  have 
  

   0.28 
  inch, 
  which, 
  added 
  to 
  the 
  quantity 
  of 
  water 
  passing 
  out 
  of 
  

   the 
  lake 
  (3.07 
  inches), 
  gives 
  as 
  the 
  approximate 
  total 
  runoff 
  for 
  

   the 
  year 
  3.35 
  inches. 
  Since 
  1880 
  was 
  a 
  very 
  dry 
  year, 
  we 
  may 
  

   compute 
  the 
  flow 
  for 
  the 
  entire 
  water 
  year 
  to 
  be 
  10.3 
  cubic 
  feet 
  

   per 
  second, 
  which 
  again 
  amounts 
  to 
  0.24 
  cubic 
  foot 
  per 
  second 
  

   per 
  square 
  mile. 
  

  

  For 
  the 
  five-year 
  period 
  included 
  in 
  this 
  tabulation 
  the 
  total 
  

   rainfall 
  and 
  runoff 
  are 
  as 
  follows: 
  

  

  Rainfall, 
  Run-off, 
  

  

  inches 
  inches 
  

  

  1880 
  21.99 
  3.07 
  

  

  1881 
  24.27 
  8.38 
  

  

  1882 
  25.46 
  14.51 
  

  

  1883 
  32.24 
  9.29 
  

  

  1884 
  26.74 
  12.57 
  

  

  Add 
  for 
  rise 
  in 
  level 
  .40 
  

  

  Total 
  130.70 
  48.22 
  

  

  For 
  the 
  five-year 
  period 
  the 
  total 
  runoff 
  was 
  therefore 
  only 
  36.9 
  

   per 
  cent 
  of 
  the 
  rainfall. 
  In 
  1880 
  the 
  runoff 
  was 
  only 
  15.2 
  per 
  cent 
  

   of 
  the 
  rainfall. 
  The 
  corrections 
  for 
  rise 
  in 
  lake 
  level 
  are 
  included 
  

   in 
  these 
  statements. 
  

  

  Minimum 
  flow 
  of 
  Oswego 
  river. 
  Previous 
  to 
  1897 
  there 
  were 
  

   no 
  records 
  of 
  any 
  long-continued 
  measurements 
  of 
  the 
  flow 
  of 
  

  

  1 
  Report 
  on 
  the 
  Cost 
  and 
  Policy 
  of 
  Constructing 
  Reservoirs 
  on 
  Conesus, 
  

   Hemlock, 
  Honeoye 
  and 
  Canadice 
  lakes. 
  Senate 
  document, 
  No. 
  40, 
  1850. 
  

  

  