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  1. hydroponder

    When modeling storm sewers and catch basins, does the model count storage in pipe?

    I am modeling a storm sewer system that will connect to an underground array of pipe (storage) before outletting to existing storm sewer. I originally setup the model to model the array of pipes as a pond and just used one catchment for the inflow of the storm sewer to the storage pipes. For...
  2. hydroponder

    Foundation Design for Picnic Shelter on organic silt?

    I am charged with designing the foundation for a 320 square foot picnic shelter with 4 to 6 structural columns on a slab-on-grade floor. Unfortunately, we completed two soil borings on site last week and the borings show organic silt the entire depth of the borings, to 35 feet. Blow counts...
  3. hydroponder

    Timber retaining wall tie-backs...what to use?

    I am building a 6x6 timber retaining wall that will be about 5 feet high and 20 feet long. I need to figure out a way to tie the retaining wall back into the slope. Typically, I would use deadmen to do this, however I have two trees that about 4 feet behind the proposed retaining wall so I...
  4. hydroponder

    Draintile for concrete block wall...where to place?

    I am rebuilding my garage and am wondering what is the ideal depth to place the draintile. The existing garage is completely demolished and I am getting concrete today. I have an alley garage and I walk about about 6 feet to my back yard to the east. The north wall will also be buried...
  5. hydroponder

    Output precision...round off to nearest whole number?

    Is it possible to change the HydroCAD output precision to round off to the nearest whole number or one decimal place? I spoke with the watershed reviewing engineer for a project of mine and she has stated that I can round off to the nearest cfs for reporting my rates. So, I would like the...
  6. hydroponder

    Dimensions not plan readable..

    I am dimensioning my site plan in model space and I have paper space set up with a rotated view so as to fit the site on my title block. The problem is that when I rotate the view (command: DV -> TWist) the dimensions are not plan readable. Instead, the dimensions stay readable to the North...
  7. hydroponder

    10 day snow-melt peak seems low...

    I am modeling an industrial lot that will have three infiltration basins to manage stormwater. Per the watershed district, I have to analyze rates for the 100-year 5.9" rainfall and the 10-day snow melt (7.2") event. It seems to me that the peak runoffs should be a little closer than the rates...
  8. hydroponder

    Oscillations causing trouble in HydroCAD

    I'm having a bit of trouble getting my HydroCAD model to run without warning messages. I am modeling three infiltration basins that have underground rock storage with a 6" draintile outlet as well as an overflow catch basin outlet. The model is basically blowing up and I can't get rid of the...
  9. hydroponder

    Importing TIN data

    I received a .tin file from an aerial topography company and am trying to create my own surface using this file. Can this be done? It seems to me that it should be a fairly simple procedure, but the solution is eluding me at the moment. I am running AutoCAD C3D LDC 2009...basically land desktop.
  10. hydroponder

    Dimensions not plan readable?

    I am creating a site plan that has north to the left. In model space, north is up (standard), but in paper space, I am using a viewport to rotate the plan view so that north is to the left so the whole site fits on my plan sheet. When I do this, my dimensions are not plan readable. Is there a...
  11. hydroponder

    How do YOU design storm sewer?

    I am wondering how some of the users here design storm sewer. I have always used a spreadsheet I put together that uses the rational method along with Manning's formula to design storm sewer. I have heard of some folks using HydroCAD to design storm sewer, and I have used it on some smaller...
  12. hydroponder

    Sanitary sewer and storm sewer crossing clearance?

    How close would you cross a sanitary sewer with a storm sewer. The sanitary sewer is an 8" PVC and the storm sewer is a 12" RCP. Normally, I try to keep 18" between the crossings, but I cannot make this happen. Basically, the way it is designed right now, the sanitary is sitting right on top...
  13. hydroponder

    Stretching a drawing in one direction..

    I am creating a cross-section that will depict a street and parking lot with a few cars on it. I have blocks of the cars, however, I have an exaggerated vertical scale, so I need to stretch to cars vertically, but not horizontally. Can this be done? If so, how?
  14. hydroponder

    What tests to run on a shelby tube

    I am working on a site that has approximately 10 feet of fill that is loose to medium dense sand (N ~ 3-10) on top of approximately 10 feet of loose clay (N ~ 1-5) on top of some stiff clay till (N > 10). From historic photos, it appears that the site was originally a wetland that was filled in...
  15. hydroponder

    Upgrading to Civil 3D...general question

    For those of you who have made the transition from LDD to C3D, did you attend courses to learn the new operating system? My reseller offers a fundamentals course and a styles and standards course that I am thinking of attending. However, due to the relatively slow economy right now, I have...
  16. hydroponder

    Gravel mining operation

    I am doing a geological assessment for a client and have to provide a value for the proposed mining. We have collected the soil boring information and ran the pertinent tests. We have found that there are lenses of gravel that contain approximately 30% gravel, with the remaining 70% meeting...
  17. hydroponder

    Time of Concentration - Lag/CN Method

    Anybody have any good ways of determining the average slope of a catchment area for determining the time of concentration? How about other good methods for determining time of concentration?
  18. hydroponder

    Filtration basin modeling

    I am trying to model a filtration basin where I have 24" of planting medium (50% sand, 25% topsoil, 25% compost) and a 4" draintile at the bottom. I am wondering if anybody has an estimate on the void ratio of the aforementioned planting medium? How does 30% sound? Also, has anybody had any...
  19. hydroponder

    HydroCAD: Modeling a catchbasin as an outlet..

    What is the best way to model a catchbasin as an outlet for an infiltration system. I usually just use a horizontal orifice, but it doesn't take into accout the grate. I suppose I should use an array of orifices, but was hoping there was an accurate, more simple way..

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