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Hydrogen Sulfide Modeling In SewerGems

Dear All , 

Kindly i have a question , and i am a little bit confused about H2s Calculations in sewer gems.

First Of all i have seen this article and it understand it well :

Modeling septicity / hydrogen sulfide (H2S) .

 

In this article i understand that SewerGems uses Pomeroy Parkhurst Equation to predict H2S formation 

Pomeroy Parkhurst Equation

Then i want to verify if that formula is really used inside the Sewer-gems . what i did is make a simple model consist of 1 line only and compare the result from sewer-gems with result from excel sheet using Pomeroy Parkhurst Equation .

Result from model is shown below and data from model is shown below 

Data 2                              

Data 2    

The Sewergem model based on the above data give me a H2s result = 0.16487 mg/l 

using excel sheet and applying Pomeroy Parkhurst Equation on the above data that i get from sewer gems , then unforuntly i did not get the same result !!!?

is there is some thing wrong inside sewer-gems programming , is sewer gems does not use the same formula or did i make a mistake  ?

this is the result from the excel sheet i get H2S = 0.1114 mg/l

Sewergems model is here 

H2s Model.rar