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  1. Kevin_Engineer

    Impervious areas - connected or not connected?

    Absolutely correct! All TR-55 related documentation applies here, and regulators will for sure check against it if that ever came into question. If you're submitting to an authority that will look at it through that lense for review, it is important to cross your t's and dot your i's using...
  2. Kevin_Engineer

    Stormwater Harvesting/Reuse for Irrigation

    cvg, the NRCS link is especially helpful. Thanks for lending your brain!
  3. Kevin_Engineer

    Stormwater Harvesting/Reuse for Irrigation

    I'm working in a few communities that are implementing stormwater harvesting systems for irrigation of yards/soccer fields, etc. We model the system based on STORAGE, IRRIGATED AREA, and DRAINAGE AREA to the system. Does anyone have good experience calculating irrigation demand? We've modeled...
  4. Kevin_Engineer

    Impervious areas - connected or not connected?

    TerryScan, I would recommend taking a 1,000-foot view of the drainage before considering curve numbers. For instance, what is the slope of the impervious surface draining to pervious areas? Does it fall to the ground, losing its energy and subjecting it to any level of infiltration? Does it...
  5. Kevin_Engineer

    Impervious areas - connected or not connected?

    Only impervious surface that is hydraulically connected directly should be considered a CN of 98 (assuming this is your impervious #). All other non-directly connected impervious areas should be considered a CN of whatever surface they join. If you think about it a different way, a roof that...
  6. Kevin_Engineer

    Are 1 FT thick retaining walls really needed in the construction of Bioretention Basins?

    I've worked in communities that implement them as a decorative separation when integrated in the urban section, but with standalone basins that take drainage from yards (aka surrounded by grass, not pavement), I've put them in with no liner or block. However, the soils I've installed then in...

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