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  • Users: swm25
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  1. swm25

    Wattles vs. drainage blanket

    I have a site with a newly constructed 50 foot long 3:1 slope. Rills are forming from overland flows from a 5 acre mildly graded area above it that is overtopping the crest that is about 600 feet long. Wattles seem like they be an option, but I'm not sure if the application is appropriate to...
  2. swm25

    Inlet riprap aprons at culverts

    What is the value of the riprap apron at a culvert inlet in a native wash, and what are guidelines on how far out to extend the inlet apron upstream? Just had a plan reviewer that wanted me to include riprap apron in front of culvert inlets, and am trying to decide how big the apron should be...
  3. swm25

    Arch shaped culverts

    The new ADOT Hydraulics manual has a bullet that states that the use of arch or oval shapes is only allowed if required by hydraulic limitations, site characteristics, structural criteria or regulatory requirements. Does anybody know why this is the case? I've seen quotes from contractors with...
  4. swm25

    4" Interlocking Block Wall with Pilasters

    Mesa, AZ has a guide for Residential Fence Walls and Retaining walls with the attached 4" interlocking block wall W/ Pilasters detail in it. I sometimes get asked to design a wall that is similar to this wall i.e. a little retaining, or a little bit higher, but I am unable to get this wall to...
  5. swm25

    2" Gas Vent Valve

    I am trying to locate a 2" gas vent valve that is normally open, the ASCO Series 8214 valve specified will take 12 weeks to get, what other valve manufacturers are there for a 2" gas vent valve that I could look into.
  6. swm25

    ASCE 7-05 Section 15.7.6

    For Design of a ground supported storage tank holding a fluid, the ASCE 7-05 Code references seismic base shear from impulsive weight, and sloshing mass weight. I'm not sure I fully understand exactly what these are, but from their descriptions I'm assuming that the impulsive weight is the...
  7. swm25

    2x6 staggered studs in 8" stud wall design

    I have a wood stud wall design in which the wall will be 8" thick, but it will be built with 2x6 studs that are staggered between the interior face and the exterior face of the wall, the idea is that more insulation can be installed in the wall, and that there will be a thermal break. The...

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