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worked out satisfactorily, the watershed being sufficient to 

 raise the lake surface about three inches for each inch of rain- 

 fall. This will be somewhat increased when all the grading 

 is done and the surface basins all built. During long periods 

 of drought it may be necessary to supplement this supply 

 from the water mains, but not much additional water will be 

 required at any time. 



The dam in the Bronx River at the Lorillard mansion will 

 ultimately have to be lowered as indicated by the original 

 studies, in order to drain the northern end of the reservation 

 in a satisfactory way ; observation and experience during 

 four seasons clearly show this to be necessary. 



During the building of the driveways east of the Bronx 

 River in the spring, the land drains previously laid about the 

 stable and to the old nursery site were connected with a large 

 earthenware pipe, which was laid northwest from near the 

 stable to a point along the road north of the tool house, tem- 

 porarily discharging on the surface at the head of a small 

 valley ; this line will ultimately be continued to the Bronx 

 River. At the same time a sewer-pipe connection was made 

 with the stable and the pipe laid northwest to a point which 

 renders unnecessary the tearing up of the driveway in its 

 continuation to the main sewer already built ; this continuation 

 may be built when convenient. 



The roof water of the propagating houses is collected into 

 a pipe which for the time being discharges on the surface at 

 the east border of the park near the houses. 



Water Supply. 



Under the city contracts for construction the system of 

 water-pipes has been much extended, in accordance with the 

 general plans ; a six-inch line has been laid alongside the 

 park driveway built around the conservatories and connected 

 at both ends with pipes of the same size previously laid ; this 

 has been supplied with hose-taps every 200 feet. Another 

 six-inch line has been laid from a point on the Southern 

 Boulevard east of the power house along the driveways to 



