52 



DESIGN 



gutters cannot be used. In such cases it will be necessary 

 to pave the gutter so that it may carry the run-off from the 

 slope and drive or path. 



Method of collecting surface water 

 from paved gutters which are neces- 

 sitated by reason of steep side slopes. 

 Inlets not satisfactory on accountQf 

 large amounts of grit, 



FIG. 17. 



Figure 13, on page 41, furnished by Mr. Cabot Ward, 

 Park Commissioner of the Boroughs of Manhattan and 

 Richmond, New York, illustrates the proper treatment for 

 drives when the side slopes are steep. Paved gutters here 

 carry the surface water. 



Absolutely level fields cannot be drained. Slight 

 depressions or slopes should be provided so that surface 

 water may be promptly removed. If the work is carefully 

 staked out, these slopes and depressions need be but slight. 



Lakes and ponds should not drop off abruptly at the 

 shore line. It is safe and proper to provide a shelf at the 

 shore line extending out 8 to 10 feet with a drop of 1J 

 feet. Lakes and ponds should be at least 8 feet deep if 

 possible. If shallower, there are apt to be objectionable 

 growths of water plants. (See Fig. 18, on page 55.) 



