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  1. Ryanemma

    IDF Curves

    The municipality usually has in the stormwater ordinance which storm to use for design purposes. I always design for a 25 year storm. Once you know the storm, the time of concentration will dictate the correct duration and thereby rainfall to use. If there is no guidance on the storm frequency...
  2. Ryanemma

    Wood Utility Pole Installation

    I use 50ft poles (class 2 or 3) for litter fence at a landfill. We have dug holes and poured concrete around them. Other times we drill out slightly larger holes and backfill with clean dry sand. Once the sand is in the poles don't move, provided the ground is solid and has a good bearing...
  3. Ryanemma

    Vertical Bends in Sewer Force Main

    I'd go with a pair of 45s on each end. A couple questions first. What is the diameter, flow rate, and pressure if known. Is it steady or intermittent flow. The steadier, faster, and higher the pressure, the better. Chances of a clog are remote if the solids content is low. Consider putting clean...
  4. Ryanemma

    CMU Shear Wall Base Connection

    I've specified to the steel manufacturer that I want an h/240 max deflection in the columns. This yields a 2.18" deflection at the top of a 45' wall. Upland on stiffening the columns with fully grouted reinforced pilasters. Having said that I anticipate a much lower deflection at the top...
  5. Ryanemma

    CMU Shear Wall Base Connection

    The shear I referred to was out of plane. Shear from wind force pushing on the wall perpendicular to wall. That would be the shear the dowels would have to resist.
  6. Ryanemma

    CMU Shear Wall Base Connection

    @ JAE http://www.ce.udel.edu/courses/CIEG407/Class_12/TEK%2005-05A.pdf This PDF talks about allowing a plastic hinge to develop with two details shown. If you could, check it out. I'm trying to reconcile in my mind what the advantage / disadvantage would be. Allowing the wall to hinge seems to...
  7. Ryanemma

    CMU Shear Wall Base Connection

    @ JAE What would be a direct connection? 4" of rebar sticking out of the foundation wall into the first course bond beam. Anything longer would induce a moment at the bottom which may or may not be a bad thing. I just don't want cracking in the wall. Has anybody read TR149A?
  8. Ryanemma

    Sewer metering & RDII rainfall

    It doesn't make sense what they are asking. Could they be thinking that your flow data does not show an infiltration event during the 2 year storm and they think you are 'estimating the infiltration' during rain events for the larger events. Maybe they don't realize that you have flow data that...
  9. Ryanemma

    Time of Concentration

    Every time I did a tc calc to the outlet of a basin, the reviewer would tell me to stop it at the edge of the basin. I agree with terry
  10. Ryanemma

    Connecting Forced Main to Gravity Main

    When houses connect to laterals via gravity, manholes are not required. They just tap into the line with a tee. I wouldn't think you would need a manhole at the connection. Most grinder lift stations can accommodate a check valve at the pump. I would put the check valve as close to the pump...
  11. Ryanemma

    CMU Shear Wall Base Connection

    I am designing a 45ft high 8" partially grouted cmu block wall (#4 @ 48"). I will have spandrels every 10ft to transfer wind load from CMU wall to steel columns. I specified a max deflection of the columns at h/240 and a max deflection of the spandrels at l/600. The steel columns are moment...

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