24 



Park Commissioners, City op Brooklyn. } 

 Engineer's Office, January 1st, 1867. j 



Jos. P. Davis, Esq., 



Engineer in Cliarge : 



Sir— 

 The following is a statement of the progress and amount of work done 

 upon the Park, from the beginning of operations in June, 1866, up to 

 January 1, 1867 : 



THE TOPOGRAPHICAL SURVEY. 



A careful topographical survey of the Park grounds being commenced, 

 several base lines were measured at suitable intervals, and from these a rec- 

 tangular system has been established, extending over the whole area. With 

 this as a base, levels have been taken, and from the data thus obtained, 

 topographical maps constructed, exhibiting accurately the variations of sur- 

 face by means of contour lines, drawn at intervals, to show each foot of 

 elevation. This work is complete for a large portion of the Park. The 

 area, the topography of which has been finished, is shown upon the accom- 

 panying map, where contour lines are drawn, representing variations of ten 

 feet in elevation. 



The rectangular division of the surface of the Park is also used as the 

 basis for the survey and location of the drives, bridle roads, walks and 

 drainage systems, and is of great assistance to the engineers in giving work- 

 ing grades for shaping ground and in making up estimates of work proposed 

 or finished. 



GRADING OF DRIVES, BRIDLE ROADS, WALKS AND MEADOWS. 



The construction force has been mainly engaged in making the necessary 

 excavation and filling for grading the Plaza exterior to the main entrance, 

 at junction of Flatbush and Ninth avenues, the drives, bridle roads and 

 walks running from the entrance into the Park and the meadow surfaces at 

 the northern portion of the grounds. 



The whole area, which has been worked over, is about sixty-one acres. 

 Of this, about twenty-eight acres have been brought to sub-grade, requiring 

 only the addition of soil to bring that portion to the proposed final surface. 

 The location and extent of the area worked over, are shown upon the 

 progress map by line shading. 



Seven thousand eight hundred lineal feet, or about one and a half miles 

 of drives, have been laid out and worked, of which five thousand seven 



