CONSTRUCTION DETAILS— DRIVES AND WALKS 



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Fig. 39.— Cross section of a watcrbound macadam driveway to show its construction. 

 Note the rubble stone gutter and the cut stone curb used in this particular drive 



Drainage. If a road is quite long and built on a grade it should 

 be provided with a gutter as shown in Fig. 40. If such a road has a 

 crushed stone or gravel surface it should have considerable camber to 

 throw off the rainwater before it can wash away any surface material. 

 A few catch basins (Figs. 41 and 42) will take care of most of the sur- 

 face water. If a sod gutter is used where the soil is more or less 

 impervious, a tile drain should be laid six inches below the bottom 

 of the gutter. 



Rubble stone gutters. On large areas where the drives are 

 wide and long, a rubble gutter is much used. Fig. 39 shows details 

 of the construction of such a gutter, the average width being about 

 sixteen to eighteen inches. To prevent grass from growing up between 

 the stones they should be pointed with cement mortar made of one 

 part cement to three parts sand. 



Catch basins. Unless there is a considerable area to be drained, 

 or unless the drains are not connected with a sewerage disposal system, 

 a catch basin is not always necessary. If the catch basin is constructed 

 of concrete the mixture should consist of one part cement, three parts 



Fig. 40— Sections through two types of concrete gutter suitable for use in connection 

 with ordinary driveways (A), or with especially wide ones, or roads in which a distinct 

 curbing is necessary (B). The latter type is also preferable for roads or drives on a slope 



