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.]