PDFWAC 173-160-211

What are the recommended well diameters?

TABLE 3
Recommended Well Diameters
Anticipated
Well Yield
in gpm
Nominal Size
of Pump Bowls
in inches
Optimum Size
of Well Casing
in inches
Less than 100
 
4
 
6 ID
 
75 to 175
 
5
 
8 ID
 
150 to 350
 
6
 
10 ID
 
300 to 700
 
8
 
12 ID
 
500 to 1000
 
10
 
14 OD
 
800 to 1800
 
12
 
16 OD
 
1200 to 3000
 
14
 
20 OD
 
2000 to 3800
 
16
 
24 OD
 
3000 to 6000
 
20
 
30 OD
 
[Statutory Authority: Chapter 18.104 RCW and RCW 43.21A.080. WSR 98-08-032 (Order 97-08), § 173-160-211, filed 3/23/98, effective 4/23/98.]