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  • Users: khu
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  1. khu

    Is there any requirement for a project alignment to be at the center of ROW?

    Yes it is. Also the road centerline does not even match the center of ROW and the edge of travel lane is not parallel to the centerline of the road, so everything is skewed to the center of ROW. This means if we run a typical section there will be areas that our bike lane buffer does not meet...
  2. khu

    Is there any requirement for a project alignment to be at the center of ROW?

    I have a project that is adding a bike lane, ditch, and sidewalk to an existing highway. We were directed by the client to maintain the existing lane and start our improvements at the edge of the lane (sawcutting inside and keeping lane line). One of the PMs in our office is adamant that the...
  3. khu

    24" Valve Anchoring?

    It's all butt-fused HDPE.
  4. khu

    24" Valve Anchoring?

    I figured this, but wasn't sure. I've never seen valves anchored, but the Contractor was asking for an anchoring detail for the valve to the slab.
  5. khu

    24" Valve Anchoring?

    I'm working on a site project with our state DOT. On the project, there is a pond supplying water to the fire suppression systems in the buildings. There is a 24" transfer line between a pump building and the fire pond. In that line there is a 24" gate valve. The DOT designer included the...
  6. khu

    Understanding the 2 ft/s minimum sanitary "self-cleaning" velocity

    This makes sense. Our local regulations list the 2fps as a guideline with a requirement for the system to have self-cleaning velocities when flushed. This all makes a bit more sense now. One thing that was confusing me is that some jurisdictions do not have the language for "when flowing full or...
  7. khu

    Understanding the 2 ft/s minimum sanitary "self-cleaning" velocity

    I need some help understanding the minimum 2 ft/s "self-cleaning" velocity referenced by the 10-state and many other standard documents. I've read the other posts on this subject, but my specific question was never quite answered that I could find. "All sewers shall be designed and constructed...
  8. khu

    Catch basins in gravel site

    The site is a maintenance yard with multiple buildings, but all the areas around the buildings are gravel (3/4" loose with some fines). The site experiences pretty bad drainage issues with many spots of localized ponding. There's not a way to grade the site to drain to one spot, so we will need...
  9. khu

    Fueling Station - Oil water separator for emergency spills

    I have an existing fueling facility (single 1,000gal tank) that was retrofitted a while back with a spill containment system that consists of a series of strip drains and catch basins to retain any spill during fueling. The issue is that the containment system has no outlet and is open to...
  10. khu

    Why is a fire flow analysis required here?

    I'll start off by saying that I don't do much SF residential work and most of my experience is on the public side, but I'm helping someone with a new 3-lot partition. The existing parcel is on a developed street. There are streets on either end of the block with mains and hydrants and there is...
  11. khu

    Max slope for 48" CSP culvert being installed on steep terrain?

    Yes I agree. I've got a request to the client to move towards a 36". The 48" was their original request, but I don't think they realized how small of an area is actually contributing to this.
  12. khu

    Max slope for 48" CSP culvert being installed on steep terrain?

    Below is a rough sketch of the layout. The culvert is proposed to be 48" CSP, but will be seeing flows well under its capacity since it's a relatively small basin. The culvert can definitely be smaller, but the owner requested for it to be upsized a bit. This allows me to bury it a decent...
  13. khu

    Max slope for 48" CSP culvert being installed on steep terrain?

    I'm being asked to design a culvert being installed at a pretty aggressive site. The channel in which the culvert will be placed is upwards of 20%. It looks like in the vicinity of the culvert, a ~17% slope in the culvert would work with the channel slope. I'm having a hard time finding...
  14. khu

    Pressure reported for hydrant test vs main pressure

    I'm trying to determine the pressure of a 10" main from hydrant test results. For some reason, I've always assumed those pressures were actual system pressures, but the water board is telling me the pressure in this line is actually ~170psi. Is there a way to convert these pressures to main...
  15. khu

    Controlling a really muddy construction site

    Finishing up plans for a new school and looking for some guidance on how to control a muddy job site. Currently, there is another school being constructed in the same city, and it's a mud pit. I've seen straw used on sites before, but is there any concern with the removal of straw before final...
  16. khu

    Modeling open-grate manhole as riser - Autodesk SSA

    I was planning on using a 44" grated manhole cover. How would I model that in SSA? Do I just assume it's a weir with length = to the circumference of the opening?
  17. khu

    Modeling open-grate manhole as riser - Autodesk SSA

    What diameter grate for the 18cfs assumption?
  18. khu

    Modeling open-grate manhole as riser - Autodesk SSA

    I'm trying to model the outlet control for a detention pond and wanted to use an open-grate manhole as a riser with an orifice sized for 2yr 24hr and a barrel sized for the design storm event. I'm a bit confused on how to model the water entering the riser. Would this be a weir with a length =...
  19. khu

    FDC and Hydrant Connection Proximity - Impact to Flows

    Basically, there are 2 6" tees at the 12" main. One feeds the fire suppression system, first entering the DCDA vault then heading to the building. The FDC ties in on the downstream line of the DCDA. The second 6" tee, roughly 10' away from the first, at the main feeds the hydrant assembly.
  20. khu

    FDC and Hydrant Connection Proximity - Impact to Flows

    Are there any restrictions with having an FDC connection located within ~ 10' of a hydrant connection on the same 12" line? I imagine there would be an impact to fire flow if the suppression system was running and they wanted to hook up to the hydrant, but I don't really do much modeling. The...

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