﻿790 
  NEW 
  YORK 
  STATE 
  MUSEUM 
  

  

  thereto 
  at 
  this 
  time. 
  So 
  far 
  as 
  the 
  United 
  States 
  is 
  concerned, 
  

   experience 
  on 
  the 
  Erie 
  canal 
  in 
  New 
  York 
  State 
  is 
  the 
  most 
  ex- 
  

   tensive 
  of 
  any. 
  1 
  

  

  From 
  the 
  foregoing 
  data 
  of 
  annual 
  traffic 
  and 
  tonnage 
  per 
  lock- 
  

   age 
  we 
  have 
  a 
  total 
  lockage 
  per 
  year 
  of 
  8333, 
  and 
  adding 
  the 
  usual 
  

   50 
  per 
  cent 
  for 
  two 
  ends 
  of 
  summit 
  level, 
  4167, 
  we 
  have 
  a 
  total 
  

   number 
  of 
  lockfuls 
  of 
  water 
  of 
  12,500. 
  

  

  Assuming 
  222 
  days 
  of 
  navigation, 
  we 
  have 
  the 
  following: 
  

   Volume 
  of 
  one 
  lockful 
  =(740 
  x 
  80 
  x 
  20)= 
  1,184,000 
  cubic 
  feet. 
  

   For 
  mean 
  water 
  supply 
  per 
  second, 
  we 
  have 
  : 
  

  

  12,500 
  x 
  1,184,000 
  

  

  222 
  x 
  24 
  x 
  3,600 
  

  

  = 
  772 
  cubic 
  feet, 
  

  

  or, 
  for 
  even 
  figures, 
  we 
  may 
  place 
  the 
  lockage 
  requirement 
  at 
  

   800 
  cubic 
  feet 
  per 
  second. 
  The 
  foregoing 
  quantity 
  of 
  800 
  cubic 
  

   feet 
  per 
  second 
  expenditure 
  of 
  water 
  for 
  lockage 
  is 
  based 
  upon 
  

   absolutely 
  uniform 
  distribution 
  of 
  vessels, 
  both 
  as 
  to 
  direction 
  

   and 
  season. 
  As 
  a 
  modifying 
  factor 
  we 
  should 
  take 
  into 
  account 
  

   these 
  elements 
  : 
  

  

  1) 
  Since 
  the 
  feeder 
  has 
  no 
  storage 
  in 
  the 
  vicinity 
  of 
  the 
  main 
  

   canal 
  a 
  draft 
  in 
  excess 
  of 
  the 
  mean 
  quantity 
  must 
  be 
  drawn 
  from 
  

   the 
  main 
  channel 
  itself. 
  

  

  2) 
  There 
  will 
  be 
  a 
  tendency 
  to 
  more 
  lockage 
  in 
  daylight 
  than 
  

   at 
  night. 
  

  

  3) 
  In 
  the 
  spring 
  of 
  the 
  year, 
  on 
  account 
  of 
  the 
  preponderance 
  

   of 
  the 
  grain 
  trade, 
  the 
  larger 
  proportion 
  of 
  movement 
  will 
  prob- 
  

   ably 
  be, 
  for 
  a 
  time, 
  from 
  west 
  to 
  east. 
  At 
  other 
  seasons 
  there 
  

   are 
  likely 
  to 
  be 
  times 
  when 
  the 
  traffic 
  will 
  be 
  in 
  excess 
  in 
  one 
  

   direction. 
  The 
  estimate 
  of 
  one 
  and 
  one 
  half 
  lockfuls 
  of 
  water 
  

   for 
  each 
  vessel 
  passing 
  the 
  summit 
  is 
  based 
  on 
  uniform 
  distri- 
  

   bution 
  of 
  the 
  traffic, 
  otherwise 
  two 
  lockfuls 
  per 
  vessel 
  passing 
  

   is 
  required. 
  The 
  proper 
  addition 
  to 
  the 
  lockage 
  requirement 
  on 
  

   account 
  of 
  such 
  irregularity 
  can 
  not 
  be 
  definitely 
  determined 
  

   until 
  one 
  has 
  statistics 
  of 
  the 
  actual 
  movement 
  covering 
  a 
  series 
  

   of 
  years. 
  In 
  the 
  absence 
  of 
  such 
  the 
  foregoing 
  may 
  be 
  pointed 
  

   out 
  as 
  a 
  reason 
  why 
  the 
  lockage 
  requirement 
  should 
  be 
  properly 
  

   placed 
  somewhat 
  larger 
  than 
  the 
  theoretical 
  figure. 
  

  

  *For 
  these 
  data 
  reference 
  may 
  be 
  made 
  to 
  the 
  section 
  on 
  Loss 
  of 
  Water 
  

   from 
  Artificial 
  Channels 
  in 
  this 
  report. 
  There 
  are 
  a 
  number 
  of 
  other 
  refer- 
  

   ences, 
  as 
  Water 
  Supply 
  of 
  Western 
  Division 
  of 
  Erie 
  Canal, 
  etc. 
  The 
  Barge 
  

   Canal 
  Report 
  contains 
  a 
  resume 
  of 
  the 
  preceding, 
  together 
  with 
  the 
  Euro- 
  

   pean 
  data, 
  etc. 
  

  

  