﻿190 
  NEW 
  YORK 
  STATE 
  MUSEUM 
  

  

  is 
  further 
  mostly 
  limited 
  to 
  streams 
  with 
  considerable 
  length 
  of 
  

   record. 
  

  

  Description 
  of 
  Muskingum, 
  Genesee, 
  Croton 
  and 
  Hudson 
  rivers. 
  

   Table 
  42 
  gives 
  the 
  rainfall, 
  runoff, 
  and 
  evaporation 
  of 
  the 
  storage, 
  

   growing 
  and 
  replenishing 
  periods, 
  as 
  well 
  as 
  the 
  total 
  of 
  these 
  

   three 
  items, 
  on 
  the 
  Muskingum 
  river, 
  for 
  the 
  years' 
  1888-1895, 
  

   inclusive. 
  The 
  minimum 
  year 
  was 
  1895, 
  the 
  total 
  runoff 
  being 
  

   4.90 
  inches. 
  The 
  maximum 
  occurred 
  in 
  1890, 
  with 
  a 
  total 
  runoff 
  

   of 
  26.84 
  inches. 
  The 
  mean 
  runoff 
  for 
  the 
  entire 
  period 
  is 
  13.1 
  

   inches. 
  

  

  Table 
  43 
  gives 
  the 
  same 
  facts 
  for 
  the 
  Genesee 
  river 
  for 
  the 
  years 
  

   1890-1898, 
  inclusive. 
  In 
  this 
  table, 
  for 
  the 
  years 
  1890-1892, 
  the 
  

   record 
  of 
  Oatka 
  creek 
  which 
  was 
  gaged 
  by 
  the 
  writer, 
  has 
  been 
  

   used. 
  For 
  a 
  portion 
  of 
  1893 
  the 
  results 
  are 
  computed. 
  The 
  dam 
  

   at 
  Mount 
  Morris, 
  at 
  which 
  gagings 
  were 
  taken, 
  was 
  carried 
  away 
  

   by 
  a 
  flood 
  early 
  in 
  1897, 
  and 
  for 
  the 
  years 
  1897 
  and 
  1898 
  the 
  

   gaging 
  record 
  has 
  been 
  deduced 
  by 
  comparison 
  of 
  the 
  rainfalls 
  

   with 
  those 
  at 
  Rochester, 
  where 
  gagings 
  are 
  kept 
  by 
  the 
  City 
  Engi- 
  

   neer. 
  The 
  results, 
  aside 
  from 
  those 
  for 
  the 
  years 
  1894-1896, 
  must 
  

   be 
  considered 
  somewhat 
  approximate, 
  although 
  probably 
  within 
  

   10 
  per 
  cent 
  of 
  the 
  truth. 
  The 
  mean 
  evaporation 
  for 
  the 
  years 
  

   1894-1896 
  was 
  27.21 
  inches. 
  

  

  Tables 
  66 
  and 
  67 
  exhibit 
  the 
  rainfall, 
  runoff, 
  and 
  evaporation 
  of 
  

   the 
  storage, 
  growing, 
  and 
  replenishing 
  periods 
  for 
  Croton 
  river, 
  

   from 
  1868-1899, 
  inclusive, 
  a 
  period 
  of 
  thirty-two 
  years. 
  This 
  record 
  

   has 
  been 
  revised 
  as 
  per 
  experiments 
  at 
  Cornell 
  University, 
  described 
  

   by 
  John 
  R. 
  Freeman, 
  member 
  American 
  Society 
  Civil 
  Engineers, 
  in. 
  

   his 
  report 
  to 
  the 
  Comptroller 
  in 
  1900. 
  As 
  shown 
  by 
  Mr 
  Freeman, 
  

   the 
  rainfall 
  record 
  from 
  1868-1876, 
  inclusive, 
  is 
  not 
  very 
  reliable, 
  

   and 
  accordingly 
  two 
  sets 
  of 
  means 
  are 
  given. 
  The 
  mean 
  rainfall 
  

   from 
  1868-1876, 
  inclusive, 
  was 
  45 
  inches, 
  the 
  mean 
  runoff 
  23.37 
  

   inches, 
  and 
  the 
  mean 
  evaporation 
  21.63 
  inches. 
  For 
  the 
  second 
  

   period 
  the 
  rainfall 
  from 
  1877-1899, 
  inclusive, 
  has 
  been 
  so 
  ration- 
  

   ally 
  treated 
  by 
  Mr 
  Freeman 
  as 
  to 
  leave 
  nothing 
  to 
  be 
  desired. 
  The 
  

   means 
  for 
  this 
  second 
  period 
  are: 
  rainfall, 
  49.33 
  inches; 
  runoff, 
  

   22.81 
  inches, 
  and 
  evaporation, 
  26.52 
  inches. 
  A 
  comparison 
  of 
  

   these 
  two 
  sets 
  of 
  means 
  shows 
  how 
  dangerous 
  it 
  is 
  to 
  draw 
  final 
  

  

  