Change in LID parameter not reflecting in calculation summary results

Question

SewerGEMS select series 4 (8.11.04.54) 
 
 I am modelling Infiltration trench as a LID for 2 year Return period storm event in catchment. I want to achieve LID performed infiltrated depth of runoff as 40 mm.If you observed calculation summary file in attachment, under LID performance summary ,I am receiving 375.66 mm (14.79 inch ) rainfall as a Total precipitation. And Infiltration loss as 373.63 mm (14.71 inch ) . 
 But even after changing LID unit area and number of replicate units , there is no change in Infiltration loss as 373.63 mm (14.71 inch ) value. 
 1.Which parameter I need to change to see the difference ? 
 2.How would I came to know that my LID is overflowing or not ? (Parameter provided to Infiltration trench is in attachment for your ref.) 
 3.I want to set 'Occupies full catchment ?' as true but as soon as I run model it gives me error that 'LID are is exceeding sub catchment area ' , hence by default I have to go for False option .How to solve this issue?

Fullscreen 
 2.With LID calculation summary.txt 
 Download 
 
 
 EPA STORM WATER MANAGEMENT MODEL - VERSION 5.0 (Build 5.0.022) Bentley enhanced
 --------------------------------------------------------------

 
 *********************************************************
 NOTE: The summary statistics displayed in this report are
 based on results found at every computational time step, 
 not just on results from each reporting time step.
 *********************************************************
 
 ****************
 Analysis Options
 ****************
 Flow Units ............... CFS
 Process Models:
 Rainfall/Runoff ........ YES
 Snowmelt ............... NO
 Groundwater ............ NO
 Flow Routing ........... NO
 Water Quality .......... NO
 Infiltration Method ...... CURVE_NUMBER
 Starting Date ............ JAN-01-2021 00:00:00
 Ending Date .............. JAN-02-2021 00:00:00
 Antecedent Dry Days ...... 0.0
 Report Time Step ......... 00:01:00
 Wet Time Step ............ 00:15:00
 Dry Time Step ............ 01:00:00
 
 
 ************************** Volume Depth
 Runoff Quantity Continuity acre-feet inches
 ************************** --------- -------
 Total Precipitation ...... 343.456 14.787
 Evaporation Loss ......... 0.000 0.000
 Infiltration Loss ........ 52.914 2.278
 Surface Runoff ........... 229.470 9.879
 Final Surface Storage .... 62.189 2.677
 Continuity Error (%) ..... -0.325
 
 
 ************************** Volume Volume
 Flow Routing Continuity acre-feet 10^6 gal
 ************************** --------- ---------
 Dry Weather Inflow ....... 0.000 0.000
 Wet Weather Inflow ....... 226.416 73.781
 Groundwater Inflow ....... 0.000 0.000
 RDII Inflow .............. 0.000 0.000
 External Inflow .......... 18.589 6.058
 External Outflow ......... 245.006 79.839
 Internal Outflow ......... 0.000 0.000
 Storage Losses ........... 0.000 0.000
 Initial Stored Volume .... 0.000 0.000
 Final Stored Volume ...... 0.000 0.000
 Continuity Error (%) ..... 0.000
 
 
 ***************************
 Subcatchment Runoff Summary
 ***************************
 
 --------------------------------------------------------------------------------------------------------
 Total Total Total Total Total Total Peak Runoff
 Precip Runon Evap Infil Runoff Runoff Runoff Coeff
 Subcatchment in in in in in 10^6 gal CFS
 --------------------------------------------------------------------------------------------------------
 PC:19 14.79 0.00 0.00 4.18 9.40 4.60 26.24 0.635
 PC:17 14.79 0.00 0.00 10.81 3.85 0.35 2.82 0.260
 PC:18 14.79 0.00 0.00 10.79 3.87 0.36 2.84 0.262
 PC:8 14.79 0.00 0.00 2.43 10.92 4.79 27.10 0.738
 PC:4 14.79 0.00 0.00 1.38 10.79 8.97 44.28 0.730
 PC:9 14.79 0.00 0.00 7.95 6.58 0.83 6.21 0.445
 PC:10 14.79 0.00 0.00 1.74 10.98 6.97 36.44 0.743
 PC:3 14.79 0.00 0.00 3.77 10.17 2.78 17.44 0.688
 PC:7 14.79 0.00 0.00 0.21 13.22 3.64 21.70 0.894
 PC:12 14.79 0.00 0.00 13.38 1.32 0.10 0.79 0.089
 PC:11 14.79 0.00 0.00 5.94 8.40 1.43 9.98 0.568
 PC:5 14.79 0.00 0.00 0.21 14.32 0.36 2.84 0.969
 PC:13 14.79 0.00 0.00 0.21 14.20 0.62 4.81 0.960
 PC:15 14.79 0.00 0.00 3.92 10.06 2.64 16.69 0.680
 PC:14 14.79 0.00 0.00 14.12 0.59 0.04 0.33 0.040
 PC:6 14.79 0.00 0.00 0.21 9.75 17.07 72.17 0.659
 PC:16 14.79 0.00 0.00 1.21 10.60 10.29 49.16 0.717
 PC:1 14.79 0.00 0.00 3.40 9.60 3.00 13.88 0.649
 PC:2 14.79 0.00 0.00 1.82 9.31 5.94 21.91 0.630
 

 ***********************
 LID Performance Summary
 ***********************

 ------------------------------------------------------------------------------------------------------------------
 Total Evap Infil Surface Drain Init. Final Pcnt.
 Inflow Loss Loss Outflow Outflow Storage Storage Error
 Subcatchment LID Control in in in in in in in
 ------------------------------------------------------------------------------------------------------------------
 PC:19 Infiltration_Trench 14.79 0.00 14.71 0.00 0.00 0.00 0.08 -0.02
 PC:17 Infiltration_Trench 14.79 0.00 14.71 0.00 0.00 0.00 0.08 -0.02
 PC:18 Infiltration_Trench 14.79 0.00 14.71 0.00 0.00 0.00 0.08 -0.02
 PC:8 Infiltration_Trench 14.79 0.00 14.71 0.00 0.00 0.00 0.08 -0.02
 PC:4 Infiltration_Trench 14.79 0.00 14.71 0.00 0.00 0.00 0.08 -0.02
 PC:9 Infiltration_Trench 14.79 0.00 14.71 0.00 0.00 0.00 0.08 -0.02
 PC:10 Infiltration_Trench 14.79 0.00 14.71 0.00 0.00 0.00 0.08 -0.02
 PC:3 Infiltration_Trench 14.79 0.00 14.71 0.00 0.00 0.00 0.08 -0.02
 PC:12 Infiltration_Trench 14.79 0.00 14.71 0.00 0.00 0.00 0.08 -0.02
 PC:11 Infiltration_Trench 14.79 0.00 14.71 0.00 0.00 0.00 0.08 -0.02
 PC:15 Infiltration_Trench 14.79 0.00 14.71 0.00 0.00 0.00 0.08 -0.02
 PC:14 Infiltration_Trench 14.79 0.00 14.71 0.00 0.00 0.00 0.08 -0.02
 PC:16 Infiltration_Trench 14.79 0.00 14.71 0.00 0.00 0.00 0.08 -0.02
 PC:1 Infiltration_Trench 14.79 0.00 14.71 0.00 0.00 0.00 0.08 -0.02
 PC:2 Infiltration_Trench 14.79 0.00 14.71 0.00 0.00 0.00 0.08 -0.02

 Analysis begun on: Thu Apr 01 12:03:07 2021
 Analysis ended on: Thu Apr 01 12:03:08 2021
 Total elapsed time: 00:00:01

Yashodhan Joshi · Answer

Hello Kushagra, 
 First and foremost, the version you are currently using SewerGEMS SS4 (08.11.04.54) is not supported anymore. As per our support policy, we have discontinued support for V8i released products. See this link for the support policy: Bentley Desktop Applications Support Policy 
 Kindly upgrade to the latest CONNECT Edition series SewerGEMS to continue receiving support. See the below articles for upgrading and understanding what's new in the CONNECT Edition series of our products; 
 Get to know SewerGEMS, CivilStorm, SewerCAD and StormCAD CONNECT Edition 
 What's New in SewerGEMS, CivilStorm, StormCAD, SewerCAD, and SewerOPS CONNECT Edition Update 3 (version 10.03.03.44) 
 To upgrade see this article: Downloading OpenFlows | Hydraulics and Hydrology Software 
 
 For your primary issue, it seems that we may have to take a look at the model files to check what is happening. However, since the current version is quite far from what you are using, I am sure we will see some changes in results since we are using the latest SWMM engine 5.1.014. As far as overflowing the LID is concerned you can look into this article: Modeling overflow from a Low Impact Development (LID) control 
 Please upgrade to the latest version so that we can continue supporting.