258 



IRRIGATION FARMING. 



The supply must be from four to twelve feet higher 

 than the location of the ram, and from twelve to one 

 hundred and fifty feet distant from it. In locating a 

 ram, not only the fall and distance must be taken into 

 consideration, but some means of draining the waste 

 water from the ram must be provided. If the ram must 

 be located in a pit to get the desired fall, a drain must 

 be provided, starting from the bottom of the pit. If it 

 is not practicable to locate the ram the desired distance 

 from the supply, a number of coils may be made in the 

 pipe. In this manner a ram may be located directly un- 



IP* 



FIG. 79. HYDKAUL1C ENGINE IN OPKKATloX. 



der the supply, and will work equally well. The supply 

 must determine the size of the pipe to be used. Never 

 use a ram that is too large for the supply. If the supply 

 pipe is not kept full the ram will not work to advantage, 

 and will eventually stop and give trouble. Figure 70 

 illustrates a ram operating under very favorable 

 circumstances. 



The water can be discharged to an elevation several 

 times the fall of the water from the reservoir to the rani, 

 the greatest fall causing the discharge of the greatest 

 amount of water at a given hight, or a given amount of 

 water to a greater hight. Or, in other words, about 



