Design of pressure line orifices for equal distribution
Design of pressure line orifices for equal distribution
I am designing a septic drainfield to recieve pumped effluent. The drainfield will contain six dead end leaders, each 50-ft long. The estimated flow rate is 40 gpm, or 6.7 gpm per leader. Orifices spaced along the leader will allow the effluent to exit onto the drainfield surface. The regulatory agency requires that the flow from the least effective hole be at least 75% of the flow from the most effective hole. The leaders are 1' diameter and are installed level. I initially estimated that 1/4' diameter holes at 12' on center would provide a nice even flow. However the contractor advises that he is accustomed to providing fewer holes and smaller holes. He is concerned that the openings closest to the pump will have significantly more flow coming out of them than those near the dead end. My thoughts are that the pressure at one end of the 1' leader will be almost the same as the pressure at the other end, since a flow rate of 6.7 gpm in 1' pipe would result in 1 psi drop in the 50-ft length (if the flow rate was constant along the full 50-ft length, which it is not). Please help if you have any experience with this type of situation. I have a feeling that the design may rely more on experience than on calculated values.
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