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  • Users: cvg
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  1. cvg

    Catch basin under surcharge condition

    submerged grates tend to clog. reduce the area using a clogging factor. for areas with a lot of vegetation or trash, up to 50% clogged
  2. cvg

    Major Highway Embankment Failure June 8, 2024

    i have been on that road circa 1980. Driggs to Jackson and on to Rock springs after ski trip in a bug. what a fun drive that was...
  3. cvg

    Specification Writing

    check out the UFGS which are free. very comprehensive and can be edited to your liking Unified Facilities Guide Specifications (UFGS) https://wbdg.org/ffc/dod/unified-facilities-guide-specifications-ufgs
  4. cvg

    Cofferdam in Flowing River

    grouted rock berm will be expensive and will leak like a sieve. it would require a lot of pumping might be easier to construct a forebay with intake structure in the dry. than just connect with a channel to the river. no cofferdam needed. would also eliminate the problems with sediment and...
  5. cvg

    Mulch Fire

    50 feet is way too high and it should have been expected.
  6. cvg

    Q: Pressue in dead cavity?

    if you have a bad seal than it is connected and eventually will become fully pressurized. doesnt matter how much resistance it has to flow. I'm just surprised that half your colleagues got it wrong...
  7. cvg

    Bridge "Los Grillos" collapse on Colombia. Progressive cantilever bridge...

    the I-10 / I-215 interchange is directly on top of the San Jacinto Fault. My office used to be about a block away. my house was located approximately 2 miles from the San Andreas. I had enough fun with earthquakes and moved...
  8. cvg

    Connection of Reno Mattress to Outfall Headwall

    in the past - i hammered in regular steel fence posts and then tied the mattress to those posts. i believe it was a grid at 1 meter spacing we were unable to drive some of the posts all the way, so they had to be cut off flush with the top of gabions
  9. cvg

    Overturning checks, buoyant force load factors

    agree with la belle vie. USACE has a good guideline on the FS based on normal vs unusual vs extreme loadings. EM 1110-2-2100 Stability Analysis of Concrete Structures...
  10. cvg

    Connection of Reno Mattress to Outfall Headwall

    instead of (or in addition to) connecting to the structure, anchor using either metal posts or using a gabion anchor trench / cutoff wall.
  11. cvg

    Minimum AASHTO 57 sample for sieve analysis

    https://www.astm.org/standards/d75 Standard Practice for Sampling Aggregates
  12. cvg

    Importance of moulding moisture content for compacted sand fill

    you are obtaining the required density. MC just needs to be adequate to obtain the desired results. i think you should be ok. we usually aim for 70% relative density (per min/max tests) which should correspond to about 100% of Standard Proctor.
  13. cvg

    Importance of moulding moisture content for compacted sand fill

    what is the OMC? what is your relative density? in my experience optimum is 8 - 11% or higher. lower than that it is tough to get the density. Moisture is usually added to the stockpile and again on grade just prior to compaction. this needs to be tested immediately or the moisture drains...
  14. cvg

    Water Lines under Heavily Loaded Footing

    you can certainly redesign the footings, however eventually the pipes will leak. what then? in my mind, relocation is the only rational option
  15. cvg

    Rain Damage at Top of Augured CIP Pile.

    i would start with testing the surface "sounding" using a hammer is a typical field method to test if concrete is hard/durable/delaminated/cracked/soft listen for a ringing sound, not a thud i would not worry about rain penetrating the soil along the sides. that would be unlikely to cause any...
  16. cvg

    Pervious Driveway Infiltration Rate

    is it really infiltration rate that you need to prove? or is it the retention volume? pretty much all gravel or crushed will have relatively high infiltration rates. your chart above does not apply to washed or crushed rock, it applies to unwashed mixtures of gravel and sands which probably...
  17. cvg

    Hi everyone, I am designing a st

    you might consider prefab stoplogs/frames
  18. cvg

    Providing interception for roof

    something like this?
  19. cvg

    Geofoam backfill

    geofoam and cellular fill both require specialty contractors and therefore, are expensive or difficult to find a qualified contractor. easier and perhaps cheaper method than foam or lightweight fill would be CLSM. 1 sack or even 1/2 sack mix, placed in lifts will greatly reduce your lateral load...
  20. cvg

    Stream Channel Stabilization

    gabions are good for banks, not as good for channel bottom plain riprap, grouted riprap and boulders soil cement / roller compacted concrete piles concrete cutoff walls https://udfcd.org/wp-content/uploads/uploads/vol2%20criteria%20manual/09_Hydraulic%20Structures.pdf

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