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Water Discharge Table
This table is intended for general reference and general applicability only, and should not be relied upon as the sole or precise
source of information available with respect to the subject covered. The user should also refer to and follow manufacturer’s
specific instructions and recommendations with regard to such information, where they exist.
Flow of water through 100 foot lengths of hose, Straight - Smooth Bore - US gallons per minute
Figures are to be used as a guide since the hose inside diameter tolerance, the type of fittings used, and orifice
restriction all influence the actual discharge. Thus, variations plus or minus from the table may be obtained in actual service.
1 gallon water = 231 cubic inches = 8.333 pounds
1 pound of water = 27.7 cubic inches
1 cubic foot water = 7.5 gallons = 62.5 pounds (salt water
weighs approximately 64.3 pounds per cubic foot)
Pounds per square inch at bottom of a column of water =
height of column in feet x .434
1 miner's inch = 9 to 12 gallons per minute
Horsepower to raise water
If pumping liquid other than water, multiply the gallons per
minute below by the liquids specific gravity
Gallons per minute through a pipe
GPM = .0408 x pipe diameter inches
2
x feet/minute water
velocity
Weight of water in a pipe
Pounds water = pipe length feet x pipe diameter inches
2
x .34
Horsepower =
gallons per minute x total head in feet
3960
L
Distance
(inches)
Gallons per Minute Discharge for a Given
Nominal Pipe Diameter D (inches)
5
6
8
10
12
5
163
---
---
---
---
6
195
285
---
---
---
7
228
334
580
---
---
8
260
380
665 1060
---
9
293
430
750 1190 1660
10
326
476
830 1330 1850
11
360
525
915 1460 2020
12
390
570 1000 1600 2220
13
425
620 1080 1730 2400
14
456
670 1160 1860 2590
15
490
710 1250 2000 2780
16
520
760 1330 2120 2960
17
550
810 1410 2260 3140
18
590
860 1500 2390 3330
19
620
910 1580 2520 3500
20
650
950 1660 2660 3700
21
685 1000 1750 2800 3890
22
720 1050 1830 2920 4060
23
750 1100 1910 3060 4250
24
---
1140 2000 3200 4440
PSI at
Hose Inlet
Nominal Hose ID Diameters - Inches
1"
1¼"
1½"
2"
2½"
3"
4"
6"
20
26
47
76
161
290
468
997
2895
30
32
58
94
200
360
582
1240
3603
40
38
68
110
234
421
680
1449
4209
50
43
77
124
264
475
767
1635
4748
60
47
85
137
291
524
846
1804
5239
75
53
95
154
329
591
955
2035
5910
100
62
112
180
384
690
1115
2377
6904
125
70
126
203
433
779
1258
2681
7788
150
77
139
224
478
859
1388
2958
8593
200
90
162
262
558
1004
1621
3455
10038
Water
Water Constants and Formulas