﻿778 
  NEW 
  YORK 
  STATE 
  MUSEUM 
  

  

  Since 
  the 
  principal 
  canal 
  to 
  be 
  constructed 
  in 
  connecting 
  the 
  

   Great 
  Lakes 
  with 
  the 
  Atlantic 
  tidewaters 
  passes 
  through 
  the 
  

   State 
  of 
  New 
  York, 
  the 
  following 
  outline 
  of 
  the 
  work 
  of 
  the 
  

   Board 
  of 
  Engineers 
  is 
  herewith 
  given 
  : 
  

  

  Dimensions 
  of 
  prism. 
  This 
  board 
  made 
  a 
  study 
  of 
  the 
  dimensions 
  

   of 
  St 
  Clair, 
  Suez, 
  Manchester, 
  Amsterdam 
  and 
  Kiel 
  canals, 
  to- 
  

   gether 
  with 
  the 
  speed 
  which 
  steamships 
  can 
  maintain 
  in 
  these 
  

   waterways, 
  arriving 
  at 
  the 
  conclusion 
  that 
  the 
  cross-section 
  of 
  

   the 
  canal 
  prism 
  should 
  be 
  made 
  such 
  as 
  to 
  permit 
  a 
  speed 
  of 
  

   8 
  miles 
  per 
  hour 
  on 
  tangents 
  without 
  danger 
  to 
  either 
  passing 
  

   ships 
  or 
  damage 
  to 
  the 
  banks. 
  On 
  this 
  basis 
  the 
  cross-section 
  

  

  o 
  Wre<3 
  7500 
  sg. 
  ft. 
  

   : 
  ^g=|- 
  1 
  Average 
  widIV 
  250 
  feet 
  ~Mz£^ 
  

  

  Fig. 
  59 
  Rock 
  cross-section 
  of 
  deep 
  waterways 
  for 
  30-foot 
  channel. 
  

  

  best 
  adapted 
  for 
  economic 
  transportation 
  of 
  the 
  lake 
  traffic 
  and 
  

   permitting 
  a 
  speed 
  of 
  8 
  miles 
  per 
  hour 
  is 
  about 
  5500 
  square 
  

   feet 
  for 
  a 
  21-foot 
  waterway 
  and 
  8000 
  square 
  feet 
  for 
  a 
  30-foot 
  

   waterway. 
  

  

  On 
  open 
  rivers 
  a 
  bottom 
  width 
  of 
  600 
  feet 
  was 
  adopted 
  as 
  

   necessary 
  for 
  safe 
  navigation. 
  On 
  the 
  Hudson 
  and 
  Mohawk 
  

   rivers 
  the 
  cross-section 
  of 
  the 
  waterway 
  was 
  designed 
  with 
  

   reference 
  to 
  carrying 
  flood 
  discharges 
  with 
  current 
  velocities 
  not 
  

   exceeding 
  4 
  linear 
  feet 
  per 
  second. 
  On 
  the 
  Mohawk 
  river 
  the 
  

   economic 
  cross-section 
  for 
  carrying 
  the 
  flood 
  discharge 
  at 
  not 
  

   exceeding 
  4 
  linear 
  feet 
  per 
  second 
  required 
  a 
  depth 
  of 
  consider- 
  

   ably 
  over 
  21 
  feet. 
  

  

  Dimensions 
  of 
  structures. 
  The 
  dimensions 
  of 
  lock 
  structures 
  

   were 
  designed 
  with 
  reference 
  to 
  the 
  type 
  carrier 
  likely 
  to 
  use 
  the 
  

   waterway 
  and 
  to 
  the 
  importance 
  of 
  the 
  amount 
  of 
  time 
  required 
  

   to 
  pass 
  a 
  ship 
  through 
  the 
  waterway 
  relative 
  to 
  the 
  number 
  of 
  

   ships 
  which 
  can 
  be 
  passed 
  through 
  a 
  lock 
  in 
  a 
  given 
  time, 
  and 
  in 
  

  

  