72 



to pump the water down to a depth of about three and a half feet, and 

 this will allow the water to take the regular slope of about seven feet 

 per mile. The water in the well is twelve feet deep and can readily be 

 pumped down seven feet, and this will draw water from nearly a mile 

 in every direction. There is therefore an abundant supply of water 

 within reach of the well, and the only remaining question was, could 

 the requisite amount be pumped out without bringing in with it the 

 sand in the bottom and around the well and thus fill it up. This last 

 question was set at rest by actual observation during a trial of the 

 pump. It was found that when the water in the well was drawn down 

 four and a half feet water came in at the rate of 850,000 gallons per day, 

 without in the least disturbing the sand in the bottom. This was on 

 the third day the pump was run ; and the rate of flow of the water to- 

 wards the well will increase as pumping is continued, for the subterra- 

 neous channels will arrange themselves in directions towards the well. 

 No doubt the bottom could be brought in and the well ruined by sud- 

 denly pumping the water down eight or ten feet — but if it were drawn 

 down even to that depth gradually no damage would occur. The icater 

 must not be drawn down more than four and a half feet suddenly, as 

 it cannot be done safely. 



FORT GREENE. 



The work on Fort Greene has been steadily pressed during the sea- 

 son, and a large proportion of it is completed. The walks laid last 

 year are in good order, and a large amount in addition have been laid 

 this season. Mr. T. P. Kinsley remained in charge of the work as 

 Engineer until it was suspended in November. Mr. F. Mollard per- 

 formed the duties of General Foreman during the continuance of the 

 work. 



On Prospect Park, the organization of the Engineer Department 

 remained essentially as at the last report, during the season, until the 

 suspension of work in November, when the Engineer corps was reduced 

 to correspond with the reduction of the labor force. For the Park 

 Statistics you ai*e respectfully referred to the reports of the Assistant 

 Engineers-in-charge, herewith presented. 



The Assistant Engineers-in-charge, Mr. John Bogart and Mr. John 

 Y. Culyer, have performed the duties of their respective departments 

 with skill and fidelity. 



Respectfully submitted, 



C. C. MARTIN, 



Engineer-in- Charge. 



