10 



BULLETIN" 405, U. S. DEPARTMENT OF AGRICULTURE. 



as illustrated in figures 4 and 5: Several points spaced 10 to 50 feet 

 apart may be connected in series to one pump and in this way a con- 



siderable supply of 

 .water may be devel- 

 oped from small points. 

 Centrifugal pumps 

 should not be connected 

 to the casing of a driven well, but 

 if it be advisable to use such a 

 pump it should have a separate 

 suction pipe extending inside of 

 the casing, as shown in figure 4. 

 is impossible to sink a pit, some 

 If water is below suction lift and 

 it is impossible to sink a pit, some 

 type of deep- well pump must be 

 used. 



The farmer should gain as 

 much knowledge as possible as to 

 the capacity of his ground-water 

 supply before purchasing ma- 

 chinery. This can be done by 

 sinking a small test well to show 

 what depth and kind of water- 

 bearing materials are present. 

 The test well should be pumped as 

 near to exhaustion as is practi- 

 cable and from the amount of 

 water obtained the number and 

 kind of wells necessary can be 

 estimated. Two-inch and smaller wells within suction lift can be 

 tested with a common hand pump for short periods up to a flow of 10 

 gallons per minute, and two men with a double-acting force pump 





• * o° " ° "o '.«•• 

 Fir;. 4. — Typical installation of 

 horizontal pump in brick or con- 

 crete pit with sloped belt. 

 1, Engine; 2, engine foundation; 

 3, fuel pipe ; 4, belt ; 5, priming 

 hand pump ; 0, water-cooling 

 pipe for engine ; 7 discharge 

 pipe ; 8, pump ; 9, suction pipe ; 

 10, well casing; 11, well screen; 

 12, pump foundation ; 13, long- 

 turn elbow; 14, cbeck valve. 



