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  1. WILDWINGS27

    Flow Velocity in RCP

    I typically assume a flowing full condition when setting the slopes of the sewer. In reality, it may be hard to ge a full 3 fps. This is usually the case in the upstream pipes that may have a small tributary area but are being installed to pick up a designed low spot. I never use less than a 12"...
  2. WILDWINGS27

    Wetland Pond Design

    I can only release 0.15 cfs/acre. I am already at that in my design.
  3. WILDWINGS27

    Wetland Pond Design

    I am designing a wetland style pond and need to keep the total water inundation time under 72 hours during a 100 year event in order to not kill the plants. The site is about 10 acres and the pond is only about 2-2.5' deep. Using TR-20 with a Huff rainfall distribution, my total time is over 80...
  4. WILDWINGS27

    Recycled Asphalt

    Thanks for all your responses
  5. WILDWINGS27

    Recycled Asphalt

    I am designing a parking lot and the contractor wants to use recycled asphalt. What are the negatives to using this? I assume that the parking lot may not last as long but are their any other concerns? If it matters, I live in the midwest with some pretty cold winters.
  6. WILDWINGS27

    Standard Utility Separation

    Same rules apply unless you are using a water main quality pipe
  7. WILDWINGS27

    Standard Utility Separation

    Sewer and Water are ussually 10' hor. and 1.5' vertically
  8. WILDWINGS27

    Commercial site grading plan

    I don't think any plan on the internet will answer all your questions. Every site is different.
  9. WILDWINGS27

    Civil PE - Construction Option

    The first time it will be offered is this April. No one will have taken it yet.
  10. WILDWINGS27

    Another Hydraflow Question

    I have read that the Time Interval needs to be less than 20% the time to peak. Is this correct? If so, I assume that means 20% of the time to peak of the Unit Hydrograph. Can anyone confirm my statement?
  11. WILDWINGS27

    Hydraflow hydrographs problem

    Well, I agree with the constraints that you mentioned. However, I feel that it is good in estimating the required volume that you will need. After that you can design your pond as necessary and import the design contours into the pond function to get the exact design. Otherwise you have to guess...
  12. WILDWINGS27

    Hydraflow hydrographs problem

    Use the pond wizard after you have the rainfall curve setup. It makes things pretty easy.
  13. WILDWINGS27

    Max driveway grade

    I would never go above 8%....25% is going to look terrible. Can you lower the foundation?
  14. WILDWINGS27

    Small Scale Storm Water Detention Effectiveness

    I do agree that sometimes we are better off to require a cash donation to improve or develop regional detention basins instead of having numerous small basins with unmaintainable restrictor sizes.
  15. WILDWINGS27

    Time of Concetration

    So your Tc for your pond would be about what the final Tc for the storm sewer system is?
  16. WILDWINGS27

    Time of Concetration

    I have always been a bit confused as to how to develop a proposed Time of Concetration in which to model detention. Most of the work my firm does are small (~5 acres commercial sites). Most time of concetration models assume all water is channeled directly to the pond. For instance, TR-55...
  17. WILDWINGS27

    Huff Rainfall Distribution

    THANKS, THAT MAKES SENCE
  18. WILDWINGS27

    Huff Rainfall Distribution

    Thank you for your help
  19. WILDWINGS27

    Huff Rainfall Distribution

    So, if I am required to find the maximum discharge from a 5 acre site using the Huff rainfall distribution, should I run numerous different time intervals in the 1-4 quatiles to find my maximum discharge? If I run the 1 hour-1st Quartile, the discharge seems high to me. I am just trying to...
  20. WILDWINGS27

    Huff Rainfall Distribution

    It does, but when I run the 3rd. qrt.-24 hrs, the peak runoff is significantly less that the scs 24 hour. I guess I am just confused about how to use the Huff curves.

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