The following flow chart illustrates the slow percolation test procedure:
1) | Fill the percolation hole with water to a maximum depth of 6 inches over the aggregate. | |||
2) | From a fixed reference point, measure the drop in the level of the water at 30-minute intervals, for a total of 4 hours. If the first 6 inches of water seeps away in less than 30 minutes, the interval between measurements must be reduced to 10 minutes and the length of the test must be reduced to 1 hour. | |||
3) | Fill the hole to a maximum depth of 6 inches over the aggregate as often as necessary to prevent the hole from becoming empty. | |||
4) | The amount of the drop in the level of the water during the last interval must be used to determine the percolation rate, except that if two successive measurements do not vary more than 1/16 inch, the test may be stopped and the percolation rate may be determined. | |||
Nev. Admin. Code § 444.7968
NRS 439.200, 444.650