86 
BULLETIN 414, U. S. DEPARTMENT OF AGRICULTURE. 
Values of q and h, derived by the solution of this equation, should be 
reduced by about one-third to allow for friction, and values of Q and 
H should be increased in the same proportion. 
Example: As an example of the use of the foregoing equation, sup- 
pose it is desired to determine the requisite flow of a spring to supply 
the camp of 40 convicts, in which the daily consumption is 1,800 gal- 
lons, the proposed location of the ram being 14 feet below the spring 
and 200 feet below an elevated storage tank. 
Solution: As the ram operates throughout the entire 24 hours of 
the day the quantity of water in gallons per minute to be pumped, 
(which is q) is equal to 
1800 
= 1.25 gallons. The height of the 
24X60 
storage tank above the ram (or h) is 200 feet, and the fall from the 
spring to the ram is 14 feet. Substituting these values for the sym- 
bols in the equation, 
QX14 
1.25= : 
200 
or, 
~ 1.25X200 _,__- ,. 
Q= yi =17.86 gallons per minute. 
Increasing this value by one-third to allow for friction, it is found that 
under the conditions named a flow of 23.8 gallons per minute will be 
necessary at the spring to force 1J gallons per minute into the storage 
tank. 
Table 13 gives commercial estimates of the quantities of water 
delivered in 24 hours under various conditions: 
Table 13. — -Capacity of hydraulic rams. 
Power 
head 
in 
feet. 
Pumping head in feet. 
4 
10 
15 
20 
30 
40 
50 
60 
70 
80 
90 
100 
120 
140 
160 
ISO 
200 
2 
3 
4 
5 
6 
8 
9 
10 
12 
14 
16 
18 
20 
22 
24 
26 
28 
30 
540 
192 
301 
432 
540 
128 
192 
256 
345 
432 
505 
96 
144 
192 
240 
302 
378 
432 
485 
540 
64 
96 
128 
160 
192 
235 
270 
300 
360 
430 
505 
43 
72 
96 
120 
144 
168 
192 
216 
252 
301 
353 
432 
486 
540 
29 
58 
77 
96 
115 
134 
154 
173 
192 
230 
270 
323 
390 
430 
475 
520 
24 
43 
64 
80 
96 
112 
128 
144 
160 
192 
224 
257 
303 
336 
370 
405 
470 
505 
540 
37 
55 
69 
82 
96 
110 
]24 
137 
16-5 
192 
220 
247 
288 
303 
346 
375 
430 
465 
27 
43 
60 
72 
84 
96 
108 
120 
144 
168 
192 
216 
240 
264 
288 
328 
354 
405 
24 
38 
53 
64 
75 
86 
96 
107 
128 
150 
171 
192 
214 
235 
256 
278 
300 
336 
29 
43 
57 
67 
77 
86 
96 
115 
135 
154 
173 
192 
212 
230 
250 
269 
288 
24 
30 
43 
50 
64 
72 
80 
96 
112 
128 
144 
160 
176 
192 
208 
224 
240 
26 
31 
36 
55 
62 
68 
82 
96 
110 
124 
137 
151 
164 
178 
192 
206 
27 
31 
43 
54 
60 
72 
84 
96 
108 
120 
132 
144 
156 
168 
180 
24 
28 
38 
43 
53 
64 
75 
85 
96 
107 
118 
128 
139 
149 
160 
"25' 
29 
39 
?? 
86 
96 
105 
115 
125 
134 
144 
