8 FISH CULTURE 



by pipe or sluice, arranged as is recommended 

 hereafter. 



The first work to be done is to make such 

 arrangements as will insure the easy flowing of 

 water from the sources to any part of the 

 grounds. If the fall in the land is sufficient, a 

 pipe of adequate size may be laid in the creek 

 at the upper end of the grounds, or above them, 

 so that the water can be carried to the pond by 

 gravity. When such piping is not feasible, a 

 dam must be built at the upper end of the prop- 

 erty high enough to carry the water where de- 

 sired. What may be called the reservoir, or 

 supply-dam, should not be solid from shore to 

 shore, but have a wide sluiceway at the chan- 

 nel-point, closed by splash-boards or gates, 

 which may be removed or opened during 

 freshets to carry away the surplus water and 

 maintain the reservoir at as nearly a normal 

 height as possible. 



Where it can be done, an ideal plan is to 

 establish a regular reservoir at the upper end 

 of the establishment, where the water can rest 

 awhile, subside and breed plankton, and from 

 which the supply for^the hatchery can be drawn. 



