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  1. AHickman

    OSS Add-On Question and Software Suggestions?

    This post is a little old, but I'll answer it anyways. I design large commercial septic systems for a living, so I don't think I can help much for the first paragraph (autocad and excel though). As for the second part, never remove tanks, crack and fill them. Is this a conventional system, or...
  2. AHickman

    Volume of Lift Station?

    They will be plumbed directly to this. So, I guess my question is what should I be sizing the tank for and the pump for. The smallest grinder pump is going to dwarf any flow requirements, so I'm not too concerned with that. Mostly just a volume question.
  3. AHickman

    Volume of Lift Station?

    I am needing to design a lift station for an RV park we are working on. It will be lifting sewage into our main treatment trains that we've designed for the park. Also, keep in mind, this is a lift station for < 1500 GPD, and there are no design standards, as it's out in the county our the...
  4. AHickman

    Calculating flowrate out of orifice

    Do you have any recommendations as to what type of pump I should be looking into? What I'm seeing is similar to this, which is probably not the right thing.
  5. AHickman

    Calculating flowrate out of orifice

    Tired of editing the previous post, I made a rookie mistake and screwed up the math. Turns out I need 32 psi, or 73' of head at the orifice. That is quite a lot. There's no way I could produce that, so I'd need to increase my orifice size. Increasing it to 1/2" makes a HUGE difference. Updated...
  6. AHickman

    Calculating flowrate out of orifice

    LittleInch - I'm trying to get 5 GPM per tank. I have 2 tanks, so 10 GPM overall. I will have a tee at the tom of the pump, with a ball valve and a return directly back to the tank, that way the contractor can increase/decrease the flow back into the tank to alter the pressure in the line...
  7. AHickman

    Calculating flowrate out of orifice

    LittleInch, Thanks for the response! I'll be honest though, a lot of this is going over my head, so I hope it's okay if I ask a couple question: 1 - What does ROT mean? I'm sure is an acronym for something obvious, but it's my first time reading that 2 - And by header, this would be the length...
  8. AHickman

    Calculating flowrate out of orifice

    Hi all. I design large septic systems, and we have an application where I am trying to "dose" several tanks an equal rate, or as close to equal as possible. There will be one tank with a pump, a ~1" sch 40 pvc pipe exiting that pump and out of the tank that leads to a ball valve, and after the...
  9. AHickman

    Grading a flat site?

    I'd love to be able to even think about designing something like that, but we're a very small Eng Firm (mainly just me and my father), and this isn't something he's ever had experience doing before. I wouldn't even know where to start to be honest, but I'll try googling around and see if I can...
  10. AHickman

    Grading a flat site?

    The site is all clay, going down several feet deep, so infiltration (I don't believe) will be an option. Granted, I'm not sure how far down it is, so that is definitely something I will look into. We do not need to treat the stormwater, but we will most likely be required to detain is, as we...
  11. AHickman

    Grading a flat site?

    Surface water drainage, or lack thereof. If we left the site like it is, we'd have standing water and flooding everywhere. It's an 11.26 acre site that drains north-west to south-east at a 0.15% slope, currently used as farmland. We will likely need to provide detention on the corner of the site...
  12. AHickman

    Grading a flat site?

    I have 2 sites I'm working on at the moment (Dallas) that are FLAT. One is around 0.1% and the other is 0.15%. The only solutions I've been able to come up with is putting in a series of canals to catch the water and convey it at a virtually ~0% slope and to use the cuts from the canals to raise...

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