METHODS OF DISCHARGE 



47 



or off to one side of the path or drive in grass gutters, which 

 will be discussed under the heading of Grading. The dis- 

 tance apart is a function of the amount of water to be 

 carried. Past experience has clearly demonstrated that 

 catch-basins and inlets are frequently placed too far apart 

 and almost never too close together. A spacing often used 

 is 125 feet. 



If a sewer carries water from a row of catch-basins along 

 a drive, the sewer should not be placed under the drive, but 

 rather under grass or shrubbery, where it can easily be 

 reached in case of trouble. 



-Grass 



Gutter 



Concrete 

 Inlet 



r-2 r 



Qravel < 



Cement Sidewalk 

 Cinder Foundation 



6 uitrijjed pipe 



Method of Collecting Surface 

 Water from Grass Gutters. 



FIG. 15. 



Sewer 



Methods of Discharge. If storm-water sewers discharge 

 into other park sewers, it is not necessary to construct a 

 manhole, as is done in city practice, providing that due 

 care is observed in making the connection. 



If a storm-water sewer discharges into an open body of 

 water, the discharge may take place below the surface 

 of the water. This means that the outlet must be of special 

 design. Cast-iron pipe held in place at the end by slope 

 paving is sometimes used. Or in other cases the sewer may 

 pass out through a shore wall which holds it in position. 



The turbidity of the first wash is often a source of 

 trouble by reason of the fact that the pond or lake is rendered 

 turbid. The first washings may be side-tracked into an 



