LAYING OUT A DRAIN OR SYSTEM 



127 



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FIG. 49. Diagram drawn on common note paper, but for the same 

 purpose as that illustrated in Fig. 48. The space between lines rep- 

 resents one foot perpendicular. \ of an inch on the original repre- 

 sented 50 feet. The purpose of this figure is to show the value of 

 such a diagram in forming a rather accurate estimate of the depth 

 of the ditch at any point for any proposed initial depth and fall. 

 The position of the lines on the note paper is indicated by the 

 figures 1 to 16. 



