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Recent content by DE Yakr

  1. DE Yakr

    Tailwater Questions

    As per the HydroCAD Owner's Manual, "In order for tailwater effects to be automatically accommodated, two conditions must exist: 1) The upper node must use a routing procedure that is "tailwater aware"." and "2) The lower node must use a routing procedure that defines-(this word is in italics) a...
  2. DE Yakr

    Pond Routing

    As per the HydroCAD Owner's Manual, pond routing assumes basically a "zero-velocity level pool" and "If the velocity approaching the outlet device(s) is significant, pond routing may underestimate the discharge and overestimate the peak elevation and storage of the pond.". Questions: 1. What...
  3. DE Yakr

    Reach Routing Choice

    Storage-Indication (SI) v Muskingum-Cunge (MC) Is there a particular scenario or case where MC would definitely be the better option than SI? Other than a governing body's requirement or request.... Also, is there a major difference between the two other than the celerity aspects?
  4. DE Yakr

    Multiple Node Comparison

    I have subareas I would like to combine and then compare that "total" to another watershed area that is coming in from further upstream. What is the best way to combine those subareas?
  5. DE Yakr

    Emergency Spillway Routing

    Situation: Wet pond with a catch basin outlet structure that flows to a swale via a pipe (primary). Pretty standard outfall. The emergency spillway (ES) is designed such that it would flow directly to the swale if needed for an extreme event of if the catch basin / pipe failed for some reason...
  6. DE Yakr

    HydroCAD v HEC-RAS (for water surface elevation evaluation)

    I'm trying to write out a statement for our in-house designers why HEC-RAS should be used for a water surface evaluation difference between a pre and post condition in a streambed. A few years ago, Peter wrote, "a reach is intended only for modeling normal flow with a constant cross section"...
  7. DE Yakr

    Infiltration Trench Modeling On a Slope

    Hopefully this works....
  8. DE Yakr

    Infiltration Trench Modeling On a Slope

    If I extended the box higher, how would I separate out the 2 different void %'s? If I did the custom storage option with a combined storage number, you would definitely not use a surface area component with void %, correct? Basically, "hand" calculate a volumetric number to put in the custom...
  9. DE Yakr

    Infiltration Trench Modeling On a Slope

    Great suggestion for the box, which would be the easiest solution I believe. And HydroCAD would not "look" at the top of the box as being a solid slab per say or maybe that doesn't matter since the water level would surround that top layer anyway? Or am I just way over-thinking it? :-) BUT...
  10. DE Yakr

    Infiltration Trench Modeling On a Slope

    What is the best way to model the storage component of an infiltration trench that is on a slope, i.e. running inside a swale? At a particular elevation there would start to be two different void percentages, 40% for the stone and 100% for the open swale. And the higher the elevation, the 100%...
  11. DE Yakr

    Bioretention Area - Modeling Outflow Through Underdrain

    Played around with the outlets and removed the exfiltration limits (between EL 14 and 17) and just left it as exfiltration above EL 14 and it appears to be giving better results. Also, just routed the exfiltration straight to the primary and the results are holding. From a very technicality...
  12. DE Yakr

    Bioretention Area - Modeling Outflow Through Underdrain

    My real life setup (as it were) is a catch basin outlet with a pipe outfall (EL 14). Going to that pipe is an underdrain at EL 14, biosoil mix from EL 14 - 17, and the top of the catch basin (overflow) is at EL 18. I set the model's pipe outlet as the primary and then tried modeling the...
  13. DE Yakr

    Pipe Resizing

    Does HydroCAD tell you what the velocity is in a pipe? As per the resizing tool, I'm guessing it's sizing the pipe to handle the given flow, but what about maintaining a minimum cleanout velocity?
  14. DE Yakr

    Pipe Resizing

    For the pipe resizing "tool" (which is an awesome feature by the way), I was trying to go back to my existing drainage area and run that procedure, but the 'Resizing' tab doesn't show up under the calculation settings. I do have another diagram with a post-developed drainage area going to a BMP...
  15. DE Yakr

    Bioretention Area - Modeling Outflow Through Underdrain

    Also, under "Modeling Rain-Gardens", "Modeling Under-drains", the following statement is shown: "B) If the growth media restricts the flow of water from the pond, then it becomes the effective outlet control, and the storage definition should include only the (open water) volume above this...
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