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Recent content by nzo

  1. nzo

    Storm Duration

    thanks for the feedback everyone. RWF7437, MIDUSS stands for Micro Interactive Design of Urban Stormwater Systems. what i'm doing is modelling a 100 year storm over a 90 acre watershed because the client wants only subsurface conveyance of the runoff, no surface, therefore all the runoff has...
  2. nzo

    Erosion Control on Beach Outlet

    hi, i was wondering if anyone had some advice on erosion control on a beach where a newly constructed ditch/swale will be constructed through sand. the situation is this: a drain pipe will be installed down a bluff with an approx. 30% grade. the top of the bluff is about 14 metres (45') higher...
  3. nzo

    Storm Duration

    i'm doing some modelling using the MIDUSS program and am not sure what to use for storm duration. i'm fairly new to the concepts of SWM design and modelling so i'm not exactly sure what is a reasonable and acceptable value for storm duration. i've seen reports using 180 or 360 minutes typically...
  4. nzo

    Orifice Cd

    Hi there, can anyone tell me what you use for Cd when calculating the flow through a pipe with some head on it? I know 0.6 is used typically for a sharp edged orifice restriction and 0.86 or so for a thick plate but if you don't have an orifice restriction at the end of the pipe and just want to...

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