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  1. ALBUD1962

    Modeling Precipitation data with out a gage

    I am using a local rainfall distribution and estimating the peak inflow from the maximum depth of rainfall for any given interval. Rainfall is given in 15 minute increments. Since I am looking at the worse case scenario I am estimating that none of the rainfall is abstracted. I am not really...
  2. ALBUD1962

    Modeling Precipitation data with out a gage

    I am doing a small drainage study for an area less than an acre. The purpose of the study is to recommend solutions to correct basement flooding for a series of homes. Homeowners being as they are, really can't give me alot of information on the flow rate entering their basements or the depth of...
  3. ALBUD1962

    Erosion around inlet.

    If your outlet ditch is greater than 1% and you have significant flows into the pond, I would consider several ways to dissipate the energy. A simple one may be to extend the pipe add a manhole and have a significant step up from the manhole invert to the inflow pipe. Lay the pipe leaving the...
  4. ALBUD1962

    Setting up a dummy Win TR-20 Reach

    This is a state submission for Maryland and they require a TR-20 Model. I was able to model the hydrology in Hec HMS with similar results so I am going to request permission for using HEC HMS. Al Budinsky Skelly and Loy Harrisburg, Pa
  5. ALBUD1962

    Setting up a dummy Win TR-20 Reach

    Anyone able to provide any help? Al Budinsky Skelly and Loy Harrisburg, Pa
  6. ALBUD1962

    Setting up a dummy Win TR-20 Reach

    I am trying to model some hydrology which includes a seep at a fixed base flow (50 GPM) and a diversion of flow from a channel to a small pipe (appox. 1000 gpm or 2.2 cfs) What is the best way to model this in Win TR-20? I don't have any cross sectional information for a reach. Is there way to...
  7. ALBUD1962

    Differences in Hydro Models

    I noticed at least a 20% difference in flows computed using HEC HMS to TR 55 and TR 20 using the SCS method. Has anyone else had this problem and if so were you able to get the models calibrated more closely? Thanks Al
  8. ALBUD1962

    Height of outside concrete stairs

    I have been recently told that the height of stairs should be 7" and the tread 11" Traditonally, I have always used an 8" riser and 12" tread. Is it still valid to use an 8" riser?
  9. ALBUD1962

    Carlson Civil Package

    I have over ten years experience using Survcadd for various civil applications. While I believe you still need other packages there are features of the Hyrdology modules worth noting. The pond capacity and design are pretty decent. I was able to balance the earthwork for my pond construction...
  10. ALBUD1962

    TR-55 Storm Sewer Program w/ Hydraulic Calc

    The use of TR55 for peak storm sewer design is sort of cumbersome. TR 55 and TR 20 are more tools to check the response of a watershed to changes in the watershed. There is a chart which relates CN's to C-Factors. I usually compute the peaks using Win TR 55 and then place them into a storm sewer...
  11. ALBUD1962

    TR20 VS HEC HMS

    I noticed at least a 20% difference in flows computed using HEC HMS to TR 55 and TR 20 using the SCS method. Has anyone else had this problem and if so were you able to get the models calibrated more closely? Thanks Al
  12. ALBUD1962

    Poll - Pond Routing Software

    I use several, mainly win Tr-20 ,Hec1, and Hec-HMS since these can be check readily by reviewing agencies.
  13. ALBUD1962

    Routing through bridge

    I would develop a stage discharge relationship for the bridge.Depending on the size, this can be modeled as some sort of culvert or obtained from Hec-Ras. I am assuming you can calculate the storage behind the structure. I am not sure how you are modeling the flows(ie, scs, rational, etc.) You...
  14. ALBUD1962

    Hec HMS Woes

    I am trying to model a user generated hydrograph in hec hms with out much luck. I get these errors: ERROR: Hyetograph gage not specified for Subbasin-1 ERROR: Precipitation data not defined for subbasin Subbasin-1 I simply want to route some hydrograph values through the model. I don't have...
  15. ALBUD1962

    Stipping Topsoil and placing Topsoil loss factor

    Not sure why you would be compacting topsoil as this wouldnot be very beneficial for turf establishment. Usually a respread of 4 to 6 inches is sufficient. I have had problems with topsoil respreads of 12" especially on steep slopes.
  16. ALBUD1962

    NPDES Post Const. water quality

    You really have to watch with infiltration practices. Alot of emphasis is being placed on groundwater recharge, but if the soils and geology are not right you are causing a problem somewhere else downstream from your site. Your best bet with any infiltration practice is to include an underdrain...
  17. ALBUD1962

    max. Driveway Slope

    I know this might be a little late, but driveways steeper than 12% should be avoided. 15% is the absolute maximum.
  18. ALBUD1962

    VTPSUHM - SCS 24 hour storm with Rational Method? (tough one!)

    I know this post is dated but I would contact http://surveying.wb.psu.edu/psu-surv/tombio.htm Tom Seybert. He is very helpful.
  19. ALBUD1962

    First flush volume to flow conversion

    Erik. are you using the rational method or SCS? I would look at using CN's , since most of the infiltration practices are tied to TR-55 and the SCS method.
  20. ALBUD1962

    developing runoff hydrograph

    You need to use an interval similar to your TC, .1 hr or 6 minutes is common. I would download one of the widely used models,(they are free). Hec-HMS will let you model a complex system, but doing such its complicated to use. I have been using win tr55 and win tr20 to model simple watersheds...

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