434 THE HANDBOOK FOR PEACTICAL FAEMERS 



If the source of supply and the tank are a considerable dis- 

 tance apart so that pipes one hundred feet long or more have to 

 be laid between, the friction in the pipe will act the same as 

 though there were a small increase in the height the water has 

 to be pumped. In such cases this friction should be considered 

 in measuring the head. 



If an elevated tank is a considerable distance from the cocks 

 where the water is to be used, it should be placed a little higher 

 than would otherwise be necessary to 

 make up for the loss of pressure in the 

 long pipe lines. A good plan is to have 

 the bottom of the tank ten feet above the 

 highest cock; then ample pressure will 

 be insured at all cocks. 



2. Amount of water required. — After 

 determining the source of supply, the 

 first thing to be done before the proper 

 pump can be selected is to figure the 

 amount of water required per day. This 

 can be estimated pretty closely by using 

 the following table. This information 

 is necessary to determine the size and 



Fig. 216. — Gravity system with ram. Tank located in the attic. 



capacity of the pump to be used and, in the case of tank systems, 

 to determine also what capacity the tanks should have. 



Each , member of the family for all purposes, including 



kitchen, bath, water closet, laundry, etc will require 25 gallons 



Each horse ,. will require 10 gallons 



Each cow will require 10 gallons 



Each hog will require 2 gallons 



Each sheep will require 1 gallon 



If water is to be used in the house only, and there is a family 

 of six, the tank should have a capacity of 6X25 = 150 gallons 

 for a one-day supply. 



If water is to be used in the house and barn, and there is a 

 family of six, with eight horses, twelve cows, twenty hogs, and 

 ten sheep to be provided for, the tank should have a capacity of 



