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  1. drewnje

    Acceptable Belly/Sag in Wastewater Force Main

    I am looking for a design reference for the acceptable belly/sag in a wastewater force main. The wastewater is little more than water, but due to existing infrastructure may have to temporarily cross below and obstruction. Flow is less than 100 gpm and the pipe size is 3 inches. Any...
  2. drewnje

    Thrust Restraint at Underground Valve Discharge?

    A client is running a new 4" water service line onto their property. The pipe is going to be ductile iron and terminate at a 4" gate valve in a concrete valve box to which they will attach a hose to be utilized as needed for filling water trucks and such. The water line will supply...
  3. drewnje

    Asphalt pavement over former concrete building slab

    I have a client that is looking to demolish an old industrial building. They want to leave the building slab in place, fill in some low lying portions of the slab that have settled over time and where some sumps were located with aggregate and then pave the entire area with a 2" asphalt surface...
  4. drewnje

    Concrete/Asphalt Transition

    Usually I strictly handle water resource projects, but working on a paved industrial project where we will have concrete pads in the middle of asphalt pavement. Is there anything that needs to be taken into account at the junction of these two surfaces, or does the asphalt simply get placed to...
  5. drewnje

    Alternatives to Anti-seep collars

    The reason for my original question is that my state's sediment and erosion control manual specifies the use of anti-seep collars in sediment basin construction, so they are quite common here. I have always been aware of the difficulty in compacting the soil around the collars, but only...
  6. drewnje

    Alternatives to Anti-seep collars

    I have a general question in regard to anti-seep collars. We typically spec in our sediment basins; however, recently I have heard people say that they are not very effective and are prone to failure, especially as it is hard to compact the soil between the collars during berm/impoundment...
  7. drewnje

    Repair asphalt with concrete patch

    Hokie, what do you recommend for sealing the edges?
  8. drewnje

    Repair asphalt with concrete patch

    I should have been more clear on the size. The smallest area is a rectangular area that is 5' wide by 20' long.
  9. drewnje

    Repair asphalt with concrete patch

    Ron, in one area the client requested the concrete. It's an area approximately 50' wide by 30' long approaching two truck scales. There is some severe shoving in the asphalt as trucks brake before entering the scales. How would concrete here be any different than a concrete dumpster pad in an...
  10. drewnje

    Repair asphalt with concrete patch

    I don't work with asphalt pavement often; however, we have a client in need of some repairs to the asphalt pavement around their facility. The combination of heavy trucks, vehicle braking, and repetitive turning (and possibly improper drainage) has created some cracking, rutting, and shoving in...
  11. drewnje

    Pump/piping question

    Thanks, that was it, just had to redraw the pipe in the direction of flow, thanks again for all the help!
  12. drewnje

    Pump/piping question

    77JQX, Thanks for all the help! May I ask what modeling program you use? One last question thought, the model ran and it shows my combined flow entering the tank; however, it is showing a negative flow downgradient of one of my pumps. It doesn't make sense because I said it is going into...
  13. drewnje

    Pump/piping question

    77JQX, Thank you, I was had downloaded EPANet, but was not sure how to model it. I still have a few questions, where can I input the design point of the curves? I think I am overlooking something. When I right click and select the properties of my pumps, that is not an input.
  14. drewnje

    Pump/piping question

    The pumps were not sized taking into account another pump, they would only operate individually. Now the potentially exists that they will kick on at the same time.
  15. drewnje

    Pump/piping question

    It is a 2" diameter HDPE pipe, the exact O.D. is not 2 inches, but 2.375". We are not worried about the flow into the sump, the pumps apparently were spec'ed to meed the inflow requirements. Ultimately, the water will need to be pushed up hill to the tank 70' higher in elevation approximately...
  16. drewnje

    Pump/piping question

    I have two pumps operating in separate sumps and joining at tee and entering a tank through a single line. All lines are 2" O.D. HDPE SDR 11 pipe, shortly after the connection, the line enters a manhole and exits as a 4" SDR 11 HDPE Pipe. I have very little info on the pumps other than one was...
  17. drewnje

    Pump/piping question

    I have two pumps operating in separate sumps and joining at tee and entering a tank through a single line. All lines are 2" O.D. HDPE SDR 11 pipe, shortly after the connection, the line enters a manhole and exits as a 4" SDR 11 HDPE Pipe. I have very little info on the pumps other than one was...
  18. drewnje

    Anchor drain pipe along toe of stream bank

    Yes, we have obtained an ARAP for this. This project makes very little sense, but must be completed as part of a legal settlement. Basically it is what happens when lawyers take a turn playing engineer.
  19. drewnje

    Anchor drain pipe along toe of stream bank

    I am working on a design to collect some low flow groundwater seeps entering a stream. My issue is that to drain to single location I will have to follow the grade of the stream and my pipe is going to have to run at the toe of the stream bank within the stream channel. It is not a large stream...
  20. drewnje

    Anchor drain pipe along toe of stream bank

    I am working on a design to collect some low flow groundwater seeps entering a stream. My issue is that to drain to single location I will have to follow the grade of the stream and my pipe is going to have to run at the toe of the stream bank within the stream channel. It is not a large...

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