(45 ) 
The buildings, roads, walks and bridges have been so lo- 
cated as to necessitate the least amount of work. Some little 
grading will have to be done at the site of the Museum Build- 
ing, but the materials from here will all be needed to bring 
the road in front of the building high enough to obliterate the 
embankment over the thirty-six-inch water main which runs 
through the property at this point. At the site of the First 
Horticultural House there will be hardly enough excavating 
to make the necessary filling. The approaches to the two 
proposed bridges will require considerable filling; but in 
one case portions of the earth excavated from the proposed 
lakes will be brought into play, in the other there will prob- 
ably be enough filling obtained from the grading of the roads 
located nearby. 
25. Surface Drainage. 
By a system of catch-basins and underground drains we 
propose to carry all the surface water from the roofs, roads, 
walks and other areas to the nearest water courses. 
The catch basins are located at intervals along the roads 
and at other points where necessary to prevent all washing 
and the forming of pools. 
The drain pipe should be not less than three feet under 
ground and not less than six inches in diameter. 
26. Subsoil Drainage. 
In connection with the surface drainage a system of sub- 
soil drains has been planned, the object being to reclaim all 
swamp lands, except those needed for the bog garden, and 
to keep the roads and walks through the meadows in a per- 
fectly dry state. 
The pipes used in this work should be porous tile with col- 
lars, what are known as subsoil drain tile; they should be 
placed from two to four feet under the present surface. 
It will readily be seen by studying the plans that to ac- 
complish the desired result it will be necessary to lower the 
water in the Bronx as heretofore referred to. In connection 
