Find your horsepower in the row, then read across. Total head is the lift from the pumping water level to the discharge, plus the pressure you want at the tank (2.31 ft for every PSI), plus friction in the drop pipe.
Total head in feet · curves end at 89.5–90 GPM
| HP |
0 GPM (Shut-off) |
20 GPM |
50 GPM |
70 GPM |
80 GPM |
| 1 1/2 HP |
118 ft |
111 ft |
86 ft |
59 ft |
43 ft |
| 2 HP |
150 ft |
139 ft |
110 ft |
80 ft |
59 ft |
| 3 HP |
210 ft |
196 ft |
157 ft |
115 ft |
88 ft |
| 5 HP |
328 ft |
305 ft |
251 ft |
193 ft |
151 ft |
| 7 1/2 HP |
515 ft |
481 ft |
383 ft |
279 ft |
210 ft |
Read from the published curve in the Pumps by Baker catalog (Sept 2025, rev 3/26), p. 88, digitized and rounded down, at the flows nearest 20%, 50% and 75% of the curve’s 90.1 GPM end. 0 GPM is the printed shut-off. The last column is the last flow every curve reaches; the curve ends are named in the table title.
Output in GPM at 30 PSI (switch cut-in), by depth to water · 1 1/2–3 HP
| HP |
10 ft |
20 ft |
30 ft |
40 ft |
50 ft |
60 ft |
70 ft |
| 1 1/2 HP |
53 |
44 |
35 |
18 |
— |
— |
— |
| 2 HP |
— |
62 |
55 |
47.5 |
39 |
28 |
15 |
| 3 HP |
— |
— |
— |
— |
66 |
62 |
57 |
Output in GPM at 50 PSI (switch cut-out), by depth to water · 1 1/2–3 HP
| HP |
10 ft |
20 ft |
30 ft |
40 ft |
50 ft |
60 ft |
70 ft |
| 1 1/2 HP |
— |
— |
— |
— |
— |
— |
— |
| 2 HP |
37 |
22 |
— |
— |
— |
— |
— |
| 3 HP |
— |
— |
55 |
48 |
43 |
37 |
30 |
Output in GPM at 30 PSI (switch cut-in), by depth to water · 5–7 1/2 HP
| HP |
120 ft |
140 ft |
160 ft |
180 ft |
200 ft |
220 ft |
240 ft |
| 5 HP |
69 |
66 |
62.5 |
50 |
40 |
28 |
16 |
| 7 1/2 HP |
— |
— |
75 |
73 |
70.5 |
67.5 |
64 |
Output in GPM at 50 PSI (switch cut-out), by depth to water · 5–7 1/2 HP
| HP |
120 ft |
140 ft |
160 ft |
180 ft |
200 ft |
220 ft |
240 ft |
| 5 HP |
55 |
47 |
38 |
26 |
15 |
— |
— |
| 7 1/2 HP |
76 |
73 |
69 |
67 |
63 |
57 |
55 |
Output tables as printed in the Pumps by Baker catalog (Sept 2025, rev 3/26), pp. 87-88, at the 30 and 50 PSI rows. Riser-pipe friction is not included (manufacturer note): add it for long or small drop pipe. — marks a point A.Y. McDonald does not print for that horsepower.
Best operating range: the published curve shades the most efficient operating range for each model; the catalog prints no figures for it. The curve is in the image gallery.