﻿1 
  10 
  REPORT 
  OF 
  COMMISSIONER 
  OF 
  FISH 
  AND 
  FISHERIES. 
  

  

  utilize 
  the 
  same 
  supply 
  by 
  placing 
  one 
  after 
  another, 
  the 
  upper 
  end 
  of 
  

   the 
  lower 
  trough 
  being 
  from 
  8 
  to 
  12 
  inches 
  lower 
  than 
  the 
  overflow 
  of 
  

   the 
  upper 
  trough 
  ; 
  this 
  gives 
  a 
  good 
  aeration 
  and 
  will 
  be 
  found 
  to 
  answer 
  

  

  Lf 
  L 
  K2- 
  

  

  -c 
  Fig.3. 
  

  

  Clark-Williamson 
  Trough. 
  

  

  nearly 
  as 
  well 
  as 
  though 
  fresh 
  water 
  was 
  conducted 
  to 
  the 
  tank. 
  

   Should 
  the 
  supply 
  be 
  taken 
  from 
  a 
  creek, 
  lake, 
  or 
  other 
  reservoir 
  ex- 
  

   posed 
  to 
  cliauges 
  of 
  weather 
  and 
  drainage 
  from 
  the 
  surrounding 
  land, 
  

  

  