126 GARDEN DESIGN 



It is of the utmost importance that water should 

 be made to pass quickly away from walks of 

 porous material. Water tends to rot the path, and 

 moss and weeds will spring abundantly and con- 

 tinue the process of decay. An under system of 

 drainage may need to be provided. The ground 

 below the hard core may be cut out in either of the 

 two ways shown in Diagrams 44, 45, and land 



DIAGRAM 44. DIAGRAM 45. 



drains laid. The first method is most economi- 

 cal and in every way better for paths up to 

 6 ft. in width. After that the second may be ad- 

 visable, particularly if the soil is heavy, in order 

 that the water may escape rapidly. 



When the path is of impervious material, 

 only surface water has to be considered. At in- 

 tervals along the walk gullies must be made down 

 which surface water can run. They can be built 

 of brick with a cast-iron grating on top, or better 

 still be glazed ware " yard gullies." Brick gullies 

 are about 24 in. deep, and 8 in. from the bottom 

 a pipe is inserted to carry off the water to the 

 nearest drain, or " soak away." The object of not 

 having the overflow pipe at the bottom is to 

 allow dirt to settle before the water passes on. 

 Yard gullies have the chamber and outflow pipe 



