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  1. Martin Finch Jr EIT

    Discrepancies in results compared to other software and hand calculations

    A few things to consider, in my opinion is 224 Acres at a weighted Cn of 88+ Those contributing numbers appear significantly high when comparing to average residential outputs etc. So for the 224 acres or 0.35 sq miles, your weighted Cn is over 88? When calculating the peak flow for the...
  2. Martin Finch Jr EIT

    Discrepancies in results compared to other software and hand calculations

    https://res.cloudinary.com/engineering-com/image/upload/v1725468174/tips/HydroCAD_HydroChart_emt4la.pdf
  3. Martin Finch Jr EIT

    Discrepancies in results compared to other software and hand calculations

    Good morning, Using the simple rational method of 0.35 sq miles (224 Acres), 100-yr rainfall intensity of 7.29 in and a weighted Cn of 88.2, with a TC input of 48 minutes ;calculates to 754.42 cfs @ 12.64 hrs using HydroCAD stormwater modeling software. Please see attached Hydrograph. Hope...
  4. Martin Finch Jr EIT

    Modeling an Outlet Structure using multiple rect. Orifice/Grate outlets instead of individual weir ?

    Thank you Peter! Understood
  5. Martin Finch Jr EIT

    Modeling an Outlet Structure using multiple rect. Orifice/Grate outlets instead of individual weir ?

    Peter, I thoroughly enjoy your discussions and posts. I took a certification class back in 2004 which was a two-day seminar. Best learning experience ever! On another note, I am modeling a compound weir for my outlet structure, with both discharging through the primary culvert barrel, Device 1...
  6. Martin Finch Jr EIT

    Another name for a Yard Inlet

    drop inlet
  7. Martin Finch Jr EIT

    Bioretention Design

    Bioretention ponds can be used for both quality and quantity control if they are designed correctly. A bioretention system allows 12" of ponding, not 6". Thus, a system of underdrain pipes must be used to control this ponding level. This will help, but in addition, spec a weir wall as the...
  8. Martin Finch Jr EIT

    Time of Concentration Question

    Peter Smart is correct, he is my hero. Anyways , if the sheet flow is less than 100-ft than it is considered sheet flow, any length over 100 feet would be considered shallow conc. flow. The remaining length of your flow path is most definitely channel flow. GL

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