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Recent content by racv2

  1. racv2

    WTG Production losses & uncertainties

    Would any of you know though, how to calculate the Resulting Standard deviation of production for years 5, 10, and 20? (Jpeg attached) Thank you for your help and advice. http://files.engineering.com/getfile.aspx?folder=fd9e8452-4a3a-4285-9619-a434b4e09277&file=standarddev.JPG...
  2. racv2

    WTG Production losses & uncertainties

    Thank you guys. I was able to put together a spreadsheet (excel) to calculate the losses, uncertainty and come up with the standard deviation, of course, after doing some research in some of the recommended websites.
  3. racv2

    Wind Turbine Generator - Loss & Uncertainty

    Thank you metengr. Are you implying I am lazy? JK :-) I am actually trying to understand the math behind the calculations. I got the theory already from some of the links you posted in fact. Created the spreadsheet attached now trying to make sense of the numbers.
  4. racv2

    Wind Turbine Generator - Loss & Uncertainty

    Sorry for crossposting, I was just wondering if anybody could help me out with a good source of reference or literature on the subject of Production losses and uncertainty calculations for a Wind Turbine Generator (600 kW) Also, trying to find information on how to calculate P90 values...
  5. racv2

    WTG Production losses & uncertainties

    Does anybody have a spreadsheet (excel) to calculate the total loss and uncertainty for a wind turbine generator? I have been trying to figure out how to create my own using some online references but seem to be getting nowhere with it. Thanks guys!.
  6. racv2

    Importing Hydrocad v. 3.01 - Peak flows inconsistent

    Thanks for your help. In the original printed report (MS DOS based), they accounted for Exfiltration = 1 CFS. When I imported the old file into v8.5, the exfiltration was included as Base Flow: -1.00 in the Advanced Tab of the Edit Pond dialog box. I changed that to zero and Qin=1.6 for the...
  7. racv2

    Importing Hydrocad v. 3.01 - Peak flows inconsistent

    Hello, I imported a Hydrocad file from version 3.01 (1994) into my current Hydrocad version 8.5, and the peak inflows (Q) for a Proposed Pond, went from 1.6 cfs (original report) to 0.64 cfs. I have checked for any possible errors in the Subcatchment areas, CN's, Tc's, rainfall depth for the...
  8. racv2

    Road Profile - Vertical Curves

    Hi jeremyk55, Yes, I can choose the entrance and exit grades. Thanks for responding. Do you know where can get the spreadsheet with the vertical curve equations?
  9. racv2

    Road Profile - Vertical Curves

    Knowing the location (station) and elevation of my High and Low Points on the centerline of a road, how can I calculate the station and elevation of PVI. The desired curve length is 50'.
  10. racv2

    Detention Pond Outflow Pipes

    Hello all: I need some help with designing the outflow pipes of a detention pond. The situation is that the pond has two outflow pipes draining into two different wetland systems. I am used to designing just 1 outflow pipe and an emergency spillway, this pond has 2 pipes and 1 emergency...
  11. racv2

    Sewer force main horizontal clearance

    I am designing the pipe layout of a sewer force main that runs parallel to an existing gravity sewer. I found out that there has to be a 10' clearance between the force main and a water main but what about the horizontal clearance between the new force main pipe and the existing gravity sewer...
  12. racv2

    Detention Basin Discharge Pipe Size

    Is there any quick way to determine the size of a pipe that will be used as a discharge control (discharge pipe) for a detention basin? Pre-development qo = 36 cfs, Post-Development qi = 77 cfs The Storage Volume of the detention basin from TR-55 Vs = Vr (Vs/Vr) = 80,000 cu. ft. = 1.84 ac-ft...
  13. racv2

    Sizing and Grading a Detention Basin

    Thank you gbam and Maury for your help. Gbam: I am planning to detain to match existing conditions outflow.
  14. racv2

    Sizing and Grading a Detention Basin

    After calculating peak outflow discharges for existing and developed conditions using the TR-55 Tabular Method and figuring out the Storage Volume, I need to desing a basin that will hold 80,000 c.u.ft of runoff. I would like to know if there is any good literature (online or books) I can read...
  15. racv2

    Rational Method Q vs TR-55 Q Results

    cool! I am from the North Shore but have been to Springfield for work and know Waltham and Weston very well. I haven't been to Pittsfield yet. Where are you located now? I didn't use the Tabular method cuz I understood is more for subareas draining into a bigger area??? The whole story is...
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