﻿NEW 
  YORK 
  STATE 
  MUSEUM 
  

  

  given 
  for 
  evaporation 
  on 
  the 
  Sudbury, 
  Croton 
  and 
  Passaic 
  rivers. 
  

   The 
  following 
  is 
  his 
  general 
  formula 
  for 
  all 
  streams 
  : 
  

  

  E 
  =(15.50 
  + 
  0.16 
  R) 
  (0.05 
  T 
  — 
  1.48) 
  (19) 
  

  

  This, 
  however, 
  he 
  states 
  is 
  merely 
  a 
  suggestion. 
  His 
  purpose 
  

   is 
  to 
  deduce 
  laws 
  which 
  hold 
  for 
  the 
  State 
  of 
  New 
  Jersey 
  alone. 
  

   In 
  these 
  formulas 
  the 
  evaporation 
  is 
  taken 
  to 
  include 
  all 
  the 
  

   various 
  losses 
  of 
  water 
  to 
  which 
  a 
  catchment 
  area 
  is 
  subject, 
  

   including 
  direct 
  evaporation 
  as 
  well 
  as 
  water 
  absorbed 
  and 
  

   transpired 
  by 
  plant 
  growth, 
  etc. 
  Hence, 
  

  

  F 
  (runoff 
  )=R 
  — 
  E. 
  (20) 
  

  

  Mr 
  Vermeule 
  gives 
  the 
  following 
  formulas 
  for 
  the 
  Sudbury, 
  

   Croton 
  and 
  Passaic 
  rivers 
  : 
  

  

  December-May, 
  E=4.20+0.12 
  R; 
  (21> 
  

  

  June-November, 
  E=11.30+0.20 
  R. 
  (22) 
  

  

  These 
  formulas 
  take 
  into 
  account 
  the 
  fact 
  that 
  evaporation 
  is 
  

   low 
  in 
  the 
  winter 
  months 
  and 
  high 
  during 
  the 
  summer. 
  

  

  Mr 
  Vermeule 
  also 
  gives 
  the 
  following 
  formula 
  for 
  computing 
  

   monthly 
  evaporation 
  from 
  the 
  monthly 
  rainfall 
  for 
  Sudbury 
  r 
  

   Croton 
  and 
  Passaic 
  catchment 
  areas: 
  

  

  [e 
  = 
  monthly 
  evaporation; 
  r 
  = 
  monthly 
  rainfall.] 
  

  

  December 
  e= 
  0.42+0.10 
  r 
  j 
  

  

  January 
  e= 
  0.27+0.10 
  r 
  | 
  

  

  February 
  e= 
  0.30+0.10 
  r 
  j 
  

  

  March 
  \.. 
  e= 
  0.48+0.10 
  r 
  j 
  

  

  April 
  -. 
  e= 
  0.87+0.10 
  r 
  j 
  

  

  May 
  e= 
  1.87+0.20 
  r 
  j 
  

  

  June 
  . 
  . 
  . 
  e= 
  2.50+0.25 
  r 
  

  

  July 
  e= 
  3.00+0.30 
  r 
  | 
  

  

  August 
  e=^ 
  2.62+0.25 
  r 
  

  

  September 
  e= 
  1.63+0.20 
  r 
  

  

  October 
  e= 
  0.88+0.12 
  r 
  

  

  November 
  e= 
  0.66+0.10 
  r 
  

  

  1(23) 
  

  

  Year 
  e=15.50+0.16 
  r 
  

  

  To 
  obtain 
  the 
  monthly 
  evaporation 
  for 
  other 
  streams 
  the 
  

   results 
  obtained 
  are 
  multiplied 
  by 
  the 
  following: 
  

  

  (0.05 
  T— 
  1.48) 
  

   In 
  which 
  T=:mean 
  annual 
  temperature. 
  

  

  