CEMP-E
TI 814-01
3 August 1998
Table 5-3. Well Diameter vs. Anticipated Yield.
_________________________________________________________________
Anticipated
Nominal Size of
Optimum Size
Smallest Size
Well Yield
Pump Bowls
Well Casing
Well Casing
(L/minute)
(mm)
(mm)
(mm)
<380
100
150 ID
125 ID
285-660
125
200 ID
150 ID
570-1515
150
250 ID
200 ID
1325-2460
200
300 ID
250 ID
2270-3400
250
350 OD
300 ID
3200-4900
300
400 OD
350 OD
4550-6800
350
500 OD
400 OD
6050-11400
400
600 OD
500 OD
<100
4
6 ID
5 ID
75-175
5
8 ID
6 ID
150-400
6
10 ID
8 ID
350-650
8
12 ID
10 ID
600-900
10
14 OD
12 ID
850-1300
12
16 OD
14 OD
1200-1800
14
20 OD
16 OD
1600-3000
16
24 OD
20 OD
3000-6000
20
30 OD
24 OD
Table 5-4. Change in Yield for Variation in Well Diameter.
Original Well
New Well Diameter
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Diameter
150 mm 300 mm 450 mm 600 mm 750 mm 900 mm 1200 mm
(6")
(12")
(18")
(24")
(30")
(36")
(48")
___________________________________________________________________________
150 mm (6")
100%
110%
117%
122%
127%
131%
137%
300 mm (12")
90
100
106
111
116
119
125
450 mm (18")
84
93
100
104
108
112
117
600 mm (24")
79
88
95
100
104
107
112
750 mm (30")
76
85
91
96
100
103
108
900 mm (36")
73
82
88
92
96
100
105
1200 mm (48")
69
77
82
87
91
94
100
Note: The above gives the theoretical increase or decrease in yield that results from changing the
original well diameter to the new well diameter. For example, if a 300 mm well is enlarged to a 900mm
5-13
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