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  1. snafuman

    stormwater interception - oil removal

    Thanks for the responses. Between being sick and busy I haven't really looked at them until now.
  2. snafuman

    stormwater interception - oil removal

    The site is a 1.5 acre parking lot draining into an existing natural detention basin (wetland). The regulatory authority would like to see a stormwater interceptor installed for separation of oils and sediments. The main problem is only 1.2 feet of available fall from pavement to wetland. The...
  3. snafuman

    under water elevations

    We've done a few base maps for bottoms of lakes and reservoirs using an EDM, shooting to a man in a float tube, holding a prism and a cloth tape with a weight on the end. The EDM and prism give the location, the tape and weight give the depth, which we subtract from the lake elevation to get...
  4. snafuman

    private driveway

    er' yes, as the politicians would say, I "mis-spoke", your loads "are not" that high. yeah, like I said in the first post, sometime you can dump a lot of rock into one of these mucky spots before it starts to firm up, and it can get expensive, especially if rock is not...
  5. snafuman

    private driveway

    In similar situations, we have dumped large rock (sometimes alot!) into the muck, then covered with geotextile fabric, then aggregate base; or we might place drain rock over the fabric, then more fabric then aggregate base. You may be able to us geotextile alone with a geotechnical...
  6. snafuman

    Positive Air Pressure

    See your doctor. There are prescription medications that some climbers us for altitude sickness. Maybe they could be of some help
  7. snafuman

    EPANET modeling

    Try modeling as a very tall, small diameter gravity tank. Top elevation to match your elevation + pressure head when full; bottom elevation to match elevation + pressure head when empty; volume to match your tank volume. I'm staying out of the rest of this discussion...
  8. snafuman

    Hot/Cold Water Freezing Time

    Interesting website. From what it says the closed containers can also exibit this effect. While I don't remember that happening in my very uncontrolled experiment, that makes the whole phenomenon even stranger.
  9. snafuman

    Hot/Cold Water Freezing Time

    This actually works. I read about it many years ago and had to try if for myself. Try it in your freezer, with a bowl of hot water versus a cup of cold water. The hot water will actually freeze first. However, there will be less ice in the hot water cup than the cold water bowl. As I...
  10. snafuman

    measuring open end pipe flow

    Thanks for all the responses. We found a well driller who can supply a meter and pressure gauge to test the well, for a few hundred dollars. I think this is the only way we would be able to generate a pump curve.
  11. snafuman

    What's the acceptable construction line / base line

    Offset stakes can be set from the radial stakeout points as described in the post. The offsets can be set by the surveyor or by the contractor (the contractor can then put them where they work best for him). Of course grades must go on the offset stakes, or be moved to them by the contractor...
  12. snafuman

    Garage Floor Overlay

    There are a number of fillers which can be added to epoxy, the cheapest being a commerical grade of wood sanding dust. Chopped and milled fibers can also be added for strength, fumed silica for work-ability. Fillers are a good idea as they can add alot of thickness to your epoxy coat for a lot...
  13. snafuman

    What's the acceptable construction line / base line

    Why use stationing at all? Stationing works great for roadways, but with modern EDMs, CAD drawings and coordinate based layout programs, stationing as a layout procedure is becoming obsolete. You can show the lengths of each run of sewer line on your plans. The contractor can base his price...
  14. snafuman

    measuring open end pipe flow

    We need to measure the flow and pressures at a pump discharge. The pump is an old turbine style irrigation well pump which pumps through a gate valve and approximately 50 foot in length of old rusty 10 inch steel line, which then empties into an irrigation ditch. The pump is a older Western...
  15. snafuman

    Chlorinated City Water Into a Septic Field?

    Probably will have little effect. The chlorine residual of treated city water should be less than 1 part per million, not high enough to seriously effect the "bugs" in your septic tank. 1000 gallons of treated water a week into a septic system is pretty minor. There are treatment...
  16. snafuman

    French Drain

    Let's see if we understand each other. If you are using a perforated drain pipe with a geotextile "sock" wrapped around the pipe, then placing rock and geotextile in the trench is not necessary. You can simply drop in the wrapped pipe and the geotextile should prevent the pipe from...
  17. snafuman

    Fill volume estimate accounts for compaction?

    Usually you would apply a correction to increase the quantity of fill to allow for shrinkage. So if you had a grading plan where the uncorrected cut and fill were equal, you would actually be short of dirt, because of the shrinkage once the fill is compacted. If you are buying borrow from a...
  18. snafuman

    Plumbing expertise?

    You could do it as you said, of course the water in the main would have to be shut down. You could also install a service saddle and hot tap the main, then reduce to you 3/4". The service saddle would be bronze or steel. You should not directly connect copper to steel as there will be a...
  19. snafuman

    Earthwork Computer Program

    ABW Think of a wedding cake as a very simple grading plan. The table is the existing grade. Each layer of cake represents one foot of fill. The area of each layer, times one foot, gives the volume of that layer. Add up the volume of each layer to get the total volume of fill. Now look at...
  20. snafuman

    Earthwork Computer Program

    Ment to add to the above post, by using polylines and creating areas as I mentioned, you could do the earthwork calcs just using AutoCAD, without an add on program. It would be less convienent, but it would work.

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