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Oklahoma Administrative Code (Last Updated: March 11, 2021) |
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TITLE 252. Department of Environmental Quality |
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Chapter 641. Individual and Small Public On-Site Sewage Treatment Systems |
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Subchapter 12. Dispersal Fields |
SECTION 252:641-12-6. Drip irrigation fields
Latest version.
- (1) preceded by an aerobic treatment unit;(2) preceded by a filter capable of filtering particles larger than one hundred (100) microns; and(3) located in the identified dispersal site.(b) Components. All components used in the drip irrigation field shall be designed and manufactured specifically for use in wastewater treatment systems.(c) Pump. The pump shall:(1) be set to distribute no more than one fourth (1/4) of the designed daily flow to the drip irrigation pipe during each pumping interval over a twenty-four hour (24) period;(2) when in operation, maintain a minimum pressure of ten (10) psi and a maximum pressure of forty-five (45) psi throughout the drip irrigation pipe; and(3) have a high-water alarm set to activate and alert the owner/operator if the pump tank becomes more than one-half (1/2) full.(d) Minimum linear length. All drip irrigation fields shall meet the minimum length requirements set forth in Appendix H, Figure 12.(e) Drip irrigation pipe. The pipe used in drip irrigation fields shall be designed and manufactured for the purpose of distributing wastewater and comply with the minimum specifications in Appendix C.(f) Installation of pipe. The pipe used in drip irrigation fields shall be:(1) installed eight to ten inches (8-10") deep;(2) installed at least two feet (2') apart, center to center;(3) installed according to the manufacturer's specifications; and(4) equipped with emitters spaced:(A) one foot (1') apart in soil groups 1, 4, and 5; and(B) two feet (2') apart in soil groups 2, 2a, 3, and 3a.(g) Emitters. The emitters shall be pressure compensating to deliver uniform distribution regardless of the pressure entering the drip line.(h) Prevent backflow. To prevent backflow, at least one (1) vacuum relief valve, located in a valve box lined with gravel, shall be located at the highest point on both the supply manifold and the return manifold.(i) Back flush. There shall be a method to flush the drip irrigation pipe. The flush water shall be returned to the trash tank, aerobic treatment unit or pump tank.