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  1. LDutch

    Principal Spillway Hydrograph (PSH) in HydroCAD

    I'm trying to model a dam in HydroCAD, and have a few questions about using the "Spillway 1-day 10-day" rainfall storm type. If I use that storm type, I should input my 10-day rainfall as my "Depth". Is that correct? Also, in my Subbasin, should I be using an adjusted curve number to account for...
  2. LDutch

    Engery consumption of 15HP motor - 1PH vs. 3 PH

    Hello everyone, I'm a civil engineer who needs a little help. This may be a very dumb question, but here goes. If my client has his choice between a 1PH or 3PH motor, both 15HP which would run the exact same piece of equipment, is there a "better" choice as far as which motor would cost more...
  3. LDutch

    Concrete Sealant for Secondary Containment

    Very true Jed....I'll probably throw in a water-stop. Thanks for your input!
  4. LDutch

    Concrete Sealant for Secondary Containment

    Sorry, I think I previously misspoke (mistyped). 40 CFR Part 265 deals with "Hazardous Wastes".....while CFR Part 112 deals with "Oil Prevention Pollution". After looking at these, I believe that Part 112 is not nearly as stringent as Part 265. Part 112 requires some type of secondary...
  5. LDutch

    Concrete Sealant for Secondary Containment

    Jed....I believe Part 265 of 40 CFR deals with solid hazardous wastes....in my case I would just have to be in accordance with Part 112 with deals with Oil Pollution Prevention. I am doing this containment structure as part of an Spill Prevention, Control, and Countermeasure plan at a site in...
  6. LDutch

    Concrete Sealant for Secondary Containment

    Hello, I need help in finding a concrete joint sealant for a secondary containment structure. The sealant will be used on horizontal slabs and on vertical walls, so a self-leveling sealant will not work. The structure will serve as secondary containment for fuel tanks, so it must be fuel...

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