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  • Users: pjhealy
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  1. pjhealy

    Snow Storage in parking lots (new england)

    My site plan has been critiqued by a peer review engineer who stated that my snow storage areas are inadequate. I commonly provide 2-3% of the paved area or increase the minimum parking requirements to provide an area of the lot that can be used to pile snow. Some winters like the last see...
  2. pjhealy

    reporting invert of a culvert with reverse slope

    I would like you to confirm that this is an error in reporting and not in the calculations (HydroCAD 8.50). I entered a culvert outlet with a reverse slope from a pond to reflect the possibility that runoff could potentially back up a catch basin to manhole pipe, if the head were high enough...
  3. pjhealy

    RCN for crushed glass?

    We have a client who wants to use crushed glass as fill. Does anyone have a recommendation for the RCN to use for this surface during construction? or perhaps the porosity of crushed glass? Why it is not being recyled is beyond me, but he has a consistent supply available, and it is a clean...
  4. pjhealy

    subsurface detention

    I would like to model subsurface detention basin (crushed stone layer) under a parking lot that is sloped. There are a number of inlets through pervious pavement into the layer, so I thinnk they should be multiple Ponds. I added low (6" high) dams below each inlet, so that the infiltration will...
  5. pjhealy

    Calculate Separate Pervious/Impervious setting

    I am modelling a subcatchment where there is a parking lot and roadway adjacent to the collection point (catch basin), but a large wooded area, Hydrologic Group A soils, contributing flow to the same point. Using the default calculation setting, this option on the advanced tab being un-checked...
  6. pjhealy

    Modeling Athletic Field / Synthetic Surface - Subdrain

    How to model an athletic (football/soccer) field with sub-drains, pre- and post-development conditions? The existing field is 8" loam/sand mix over 8" gravel base over 4" perforated PVC pipe sub-drains spaced 25' apart (slope=0.025) within gravel, running to 6" solid PVC collector pipes...
  7. pjhealy

    What rainfall method to use with NRCC rainfall?

    A local town is proposing regulations that will require stornwater management facilities to be designed to handle the "extreme precipitation" shown in the "Atlas of Extreme Precipitation in the Northeastern United States" published by the Northeast Regional Climate Center (at Cornell). Since I...
  8. pjhealy

    Truck Dock - Dolly Pad Placement

    Can any of you folks tell me what the proper size and spacing of the truck dolly pad should be from the truck dock. I am working on a warehouse site plan in the northeast where trailers will be parked for periods of time, and the client wants concrete pads rather than asphalt. Thanks, PJ

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