LAYING OUT DRAINS IN THE FIELD. 73 



stake. As for example, between stations 5 and 6 curve 

 stakes are set 20 feet apart. They would be marked 

 5.20, 5.40, 5.60, etc., and indicate 5^^^ stations, or 

 520 feet, etc. 



Another thing to be noted at the time of staking the 

 main is where the sub-mains and branches enter. If 

 it is desired that a branch line should join the main 

 between stations, a stake should be set as an interme- 

 diate with the character o upon it and also the name of 

 the drain that enters. 



The same plan of staking out lines of all kinds should 

 be followed. Begin at the junction stake, and set and 

 number the stakes from the o or junction point upward 

 until the upper end is reached. The stake at the upper 

 end of each drain should have its respective name upon 

 it in addition to the station number, so that in looking 

 over the system the drains can be followed from either 

 end by schedule or map. 



Designating Drains, 



Some system of designating drains is needed where 

 there are many of them in a system, in order that the 

 notes may be kept without confusion and also corre- 

 spond with the schedule and plat which should be 

 made after the work is laid out. 



Mains may be designated as main Ay main B, etc., 

 in the order of their size or importance. Branches of 

 each main may be numbered in order, from the outlet 

 of the main up, as No. i, No. 2, -etc. If one of these 

 branches is a sub-main, that is, one receiving laterals, 

 the laterals may be designated as a^ b^ c, of that sub- 



