% 
10 BULLETIN 495, 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- 

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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 
oor ae suction pipe extending inside of 
SS | || SS the casing, as shown in figure 4. 

WM. 

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prerevires Saehnnies = is impossible to sink a pit, some 7 
Gare s Soap ipe oeteen oo, If water is below suction lift and 
°° J0 5-000 5 Maclaca . e ° ° e . ee «| 
10 BOD sp eee tse it is impossible to sink a pit, some 
oe. 6: = ay.) Oo: a: 4 
Water: ae type of deep-well pump must be © 
=— a c = 7 
“208.5 9. used. : 
Ce CS ee ee a 
028.9. 0.08 0-0 .%6.%° The farmer should gain as © 
0-6 % a19 <> me SLES Ce A 5 | 
eeaere a Giora much knowledge as possible as to 
pio 2s 2s = the capacity of his ground-water 
OS « ©. a ee Vis: v : 
Oe 2.9 5: Sisieie supply before purchasing ma- — 
oO ROG Oo. : 2 Ome ° ° S| 
<td eee Tetgnees chinery. This can be done by ~ 
Fic. 4.—Typical installation of sinking a small test well to show - 
Horizontal punip diy belek yory ere what depth and kind of water- Z| 
crete pit with sloped belt. : : i 
1, Engine; 2, engine foundation; bearing materials are present. : i 
5, Buel Pipe 5 4, belt; 5, priming _'The test: well should be pumped agiam 
hand pump; 6, water-cooling a E - 
pipe for engine; 7 discharge near to exhaustion as 1S practi- | 
DIDE = 25, BEDI; 492) SUCHONE DING 5 cable and from the amount of — 
10, well casing ; 11, well screen ; ‘ as 
12, pump foundation; 13, long- water obtained the number and > 
turn elbow; 14, check valve. 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 
