61 



Also, along the centre line of the walks and generally in the same 

 trench with the tile, were laid glazed vitrified pipe which form a pari 

 of the general drainage system of the Park. 



At proper intervals under the walk gutters, silt-basins were located 

 to receive the surface drainage and conduct it through branch pipes 

 into the general drainage system. 



POOLS. 



Two pools have been completed each with a depth of three feet of 



water. 



The Play-ground pool is situated in a natural depression, and is 

 approached by winding walks with rustic steps. 



The Battle Pass pool lies at the foot of a steep declivity and is shaded 

 by natural forest trees. 



The soil has been removed from the greater part of the site of the 

 proposed lake and reserved for future use, and several thousand yards 

 of excavation have been made. 



The northern part of the lake has been nearly completed and about 

 five acres prepared temporarily for a skating pond. 



The supply of water for the pools and lake is at present obtained 

 from the Park drainage, and the Nassau Water Department. 



AGRICULTURAL DRAINAGE. 



For all clayey or retentive soils a thorough system of tile drainage 

 has been adopted, and as far as the grounds have been finished, has 

 been carried out. 



The sizes of tile have been carefully adapted to the work required of 

 them. 



The quantity of water that will reach these drains, has been com- 

 puted with an assumed maximum rainfall of two inches in an hour, and 

 under the supposition that one half of that amount will reach the drains 

 within twenty-four hours. 



Steps have been taken to inaugurate a series of observations upon the 

 rainfall in connection with this system of tile drainage, from which it is 

 expected that valuable information Avill be obtained in regard to the 

 proportion of rainfall which reaches the tile in a given time. 



Xone but round pipe tile have been laid, and closely fitting collars 

 have been used throughout for the smaller diameter, and even upon the 

 three inch mains whenever they could be obtained. 



