Deep percolation tests - minimum drop as a function of hole diameter with four feet of water in the hole.*
| DIAMETER INCHES |
DROP IN 30 MINUTES |
MINUTES PER INCH DROP |
| 8 |
8.0 |
3.6 |
| 10 |
6.0 |
5.0 |
| 12 |
5.0 |
6.0 |
| 14 |
4.5 |
6.6 |
| 16 |
4.0 |
7.5 |
| 18 |
3.5 |
8.5 |
| 20 |
3.0 |
10.0 |
| 22 |
3.0 |
10.0 |
| 24 |
2.5 |
12.0 |
| *Equivalent to State standard test. .2077 gallons/square foot in 30 minutes. |
For test holes with more than four feet of water, the minimum drop shall be determined by the following formula:
| Minimum Drop = 16H / D |
| H = Height of water column (feet) |
| D = Diameter of hole (inches) |