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Question : Quality surface buildup - report

Posted by Amélie Thériault on January 6, 2012 at 2:31pm in Water Quality

Hi!

I want to clarify something. I am running a long term simulation to know the charge of fecal coliform in the summer.

This is the report:

  **************************     CF
  Runoff Quality Continuity                LogN
  **************************    ----------
  Initial Buildup ..........             0.000
  Surface Buildup ..........          14.254
  Wet Deposition ...........         0.000
  Sweeping Removal .........         0.000
  Infiltration Loss ........         0.000
  BMP Removal ..............         0.000
  Surface Runoff ...........        14.254
  Remaining Buildup ........         0.000
  Continuity Error (%) .....         0.000

I want to clarify the meaning of "surface buildup". To calculate the total load, have I to multiply "surface buildup" with "Surface Runoff" with "the total area" ????

thanks for your reply

Amélie

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Tags: buildup, surface, report, quality
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Replies

  • Robert Dickinson January 9, 2012 at 11:13am

    Sorry, for my poor interpretation of your question but yes you answer is right - the exp will give you the total number of fecal coli forms.

  • Amélie Thériault January 9, 2012 at 10:41am

    Hi Mrs Dickinson,

    Thanks for the reply.

    For the question above : There is no remaining buildup because I use the EMC with 100% efficiency.

    On more time, just to be sure (english is not my fisrt language) : I can measure the total load of fecal coliform like this : exp(14.254) = 1.6x10^6 #of fecal coliform. Is that right?

    Thanks,

    amélie

  • Robert Dickinson January 6, 2012 at 3:05pm

      Initial Buildup ..........             0.000       this is the initial user defined buildup
      Surface Buildup ..........          14.254     this is the buildup during the simulation
      Wet Deposition ...........         0.000       this is the precipitation load
      Sweeping Removal .........       0.000       this is the sweeping load removal
      Infiltration Loss ........         0.000          loss out of ponds and lakes
      BMP Removal ..............         0.000       loss out of BMP'S
      Surface Runoff ...........        14.254       here is your Washoff - C * Flow
      Remaining Buildup ........         0.000       is there anything left to washoff?
      Continuity Error (%) .....         0.000      perfect - you have a zero CE model

  • Robert Dickinson January 6, 2012 at 3:02pm

    The names in SWMM 4 were more meaningful but in SWMM 5 the Surface Runoff corresponds to the Washoff.  You had a buildup of 14 logN and a Washoff of the same.  The Washoff or Surface Runoff in the Water Quality table already is concentration * flow internally in SWMM 5.

    I hope this helps.

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