Section 123-5-008 - Constructed Wetlands008.01 Primary treatment will be provided for constructed wetlands. Lagoons will not be used to provide primary treatment for vegetated submerged bed constructed wetlands unless a reliable means to remove algae is provided.008.02 Multiple constructed wetland cells will be provided if the design flow is 5000 gallons per day or greater. Bypass structures will be included to allow each ceil to be isolated.008.03 Constructed wetland systems will be designed to prevent storm water runoff from entering any part of the wastewater works, unless specifically designed to treat runoff.008.04 Constructed wetland cells that treat domestic strength wastewater will have seepage rates no greater than one-eighth inch per day. Liners for constructed wetlands cells that treat higher strength wastewater will meet the seepage rate specified by the Department for the specific waste.008.05 The bottom of the soil liner will be at least four feet above the seasonal high ground water level.008.06 Effluent structures will be equipped with water level control devices capable of controlling the water depth in the wetland cell anywhere from the maximum design level to the bottom of the cell.008.07 The gravel media installed in vegetated submerged bed constructed wetlands will be graded gravel, sized not less than three-eighths inch or larger than one-inch in diameter. Except that: 008.07A Up to six inches of washed pea gravel may be laid above the media to aid in plant rooting, and 008.07B One-inch to three-inch cobbles may be installed at the influent and effluent ends to assist in flow distribution and collection.123 Neb. Admin. Code, ch. 5, § 008
Amended effective 9/4/2019