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  • Users: Dunz
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  1. Dunz

    Emergency Storage of Sanitary Sewage?

    We have been asked by a client to start gathering information on methods of storing sanitary sewage on-site in case of an emergency. They have asked for the ability to store up to 7 days worth of sewage. As an initial estimate we have gathered water usages records for 2 years and their...
  2. Dunz

    How to delineate flood plain line

    I would also be interested to hear how others solve this problem. In the past I have used contour/elevation maps. Example: If the flood elevation is 90.2' then the delineated flood line would follow the 90.2' contour.
  3. Dunz

    storm pipe minimum slope???

    Normally I will determine the min. slope which will produce a velocity of 2.5 fps (min) when the pipe is flowing full and the hydraulic gradient is equal to the slope of the pipe. This is will help carry sediment through the pipe system. And when not possible to achieve this velocity try to at...
  4. Dunz

    Tt for Open Channel

    Basins are small 2-4 acres, using the rational method to estimate the peak flow rates. Using the procedure described in Chapter 3 of the TR-55 literature to calculate Tt & Tc only. Just curious how others solve for travel time (Tt) in open channels seems to be a few choices: 1. Assume the...
  5. Dunz

    Tt for Open Channel

    TR-55 states that "Average flow velocity is usually determined for bank full elevation." Would this be considered the most conservative approach to calculate a sub-basin's Tc when using the rational method & IDF curves to determine a peak flow rate from a basin for a culvert design? Or would...

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