Solution
Referring to Fig. 13.15 and to equation (ii), the pump test results give
R 0 215 m or R 0 /Q7.15. (iii)
Q(l s^1 ) 2030405060
R 0 (m) (from equation (iii)) 143 215 286 357 427
zw(m) (from equation (ii)) 1.88 3.0 4.15 5.35 6.57
System losses (m) 1.38 3.14 5.54 8.56 12.21
Static head (m) (202) 22.00 22.00 22.00 22.00 22.00
Total system head (m) 25.26 28.14 31.69 35.91 40.78
572 PUMPING STATIONS
Fig. 13.15 Borehole pumping arrangement
For pump operation in series,
Q(l s^1 ) 0010203040
Head (m) 32.0 31.1 29.1 26.4 23.0
Pump–pipeline characteristic curves (Fig. 13.16) show that the combined
pumps deliver a discharge of 27.5 l s^1 , working against a total head of 26 m.
