Unlocking Advanced Data Analysis for SWMM5 with ChatGPT's Beta Version of GPT-4: A Possible Game-Changer for Students and Beginners

What is GPT4 with Advanced Data Analysis and when was it added? On August 28, 2023, OpenAI introduced improvements to version 4 of GPT (chatGPT Plus) incorporating advanced data analysis. This exploratory project uses SWMM5 and the beta version of GPT-4 to determine if the model can understand the formats of both the INP and RPT files, and combine them together without requiring extensive manual assistance. We will investigate various prompts in this LinkedIn article,

Prompt 1/ What Files Can you Upload to Chat GPT?

It can read and process the following file formats:

Text Files (.txt): Plain text files.

CSV Files (.csv): Comma-separated values.

JSON Files (.json): JavaScript Object Notation format.

Excel Files (.xls, .xlsx): Microsoft Excel spreadsheets.

XML Files (.xml): Extensible Markup Language files.

YAML Files (.yml, .yaml): YAML Ain't Markup Language files.

HTML Files (.html): HyperText Markup Language files for web content (for table extraction).

Markdown Files (.md): Text-based markup language files.

SQL Files (.sql): SQL query files.

You upload the files by clicking on the plus and choosing a file from your PC or elsewhere.

Prompt 2/ Does it understand the File I uploaded?

My Prompt - Can you summarize the sections in the inp file?

Success! Here's a summary of the sections in the INP file along with the number of lines in each section:

• TITLE: 2 lines
• OPTIONS: 15 lines
• EVAPORATION: 1 line
• RAINGAGES: 1 line
• SUBCATCHMENTS: 176 lines
• SUBAREAS: 176 lines
• INFILTRATION: 176 lines
• JUNCTIONS: 213 lines
• OUTFALLS: 2 lines
• STORAGE: 4 lines
• CONDUITS: 175 lines
• XSECTIONS: 175 lines
• LOSSES: 175 lines
• POLLUTANTS: 1 line
• LOADINGS: 176 lines
• REPORT: 4 lines
• MAP: 1 line
• COORDINATES: 215 lines
• VERTICES: 82 lines
• Polygons: 5508 line
• SYMBOLS: 3 lines
• BACKDROP: 1 line

Prompt 3/ Does it understand How to Fix data problems?

Yes, it can fix various text or CSV files on the fly. Which eliminates you having to conform to the data formatting needs.

It appears that the INP file contains non-UTF-8 encoded characters, which is causing the UnicodeDecodeError when attempting to read the file.

To address this, I'll attempt to read the file using a different encoding, such as ISO-8859-1 (also known as Latin-1), which is a common encoding for many files and can handle a wider range of characters.

Let's try reading the file again using the ISO-8859-1 encoding.        

Prompt 4/ Does it understand more that me?

Yes, I had two versions of the Greenville model: USA and SI Units. When i saw meters for length I asked it why the mistake. Turns out it was my mistake and I was politely told why it was meters in the inp file I uploaded.

The flow units specified in the [OPTIONS] section of your INP file are LPS (Liters Per Second), which is part of the metric unit system. In this case, the lengths for links, such as conduits, are likely to be in meters.        

Prompt 5/ Does it understand the column headings in the SWMM5 inp files?

Yes, it does for both nodes and links.

Certainly! Here are the typical variables (or headers) for links and nodes in a SWMM5 INP file:

For Links (Conduits):
Name: Identifier for the conduit
FromNode: Start node for the conduit
ToNode: End node for the conduit
Length: Length of the conduit
Roughness: Manning's roughness coefficient
InOffset: Offset height at the inlet
OutOffset: Offset height at the outlet
InitFlow: Initial flow rate in the conduit
MaxFlow: Maximum flow rate in the conduit

For Nodes (Junctions):
Name: Identifier for the junction
Elevation: Elevation of the junction
MaxDepth: Maximum depth for water at the junction
InitDepth: Initial depth of water at the junction
SurDepth: Surface depth at the junction
Aponded: Ponded area for the junction        

Prompt 6/ It understands the column headers but can it make some meaningful statistics and graphs so I can understand better?

My Prompt - show me histograms of the node invert elevation and node max depth. This is a common student ot beginning SWMM5 user issue. Not understanding the need for inverts or forgetting to import the inverts. The inverts then are zero.

Yes, it can make histograms and statistical tables that find data errors.

Here are the histograms showing the distributions of node invert elevations and node max depths in your SWMM5 INP file: Left Histogram: Shows the distribution of node invert elevations. The units are in meters. Right Histogram: Shows the distribution of node max depths. The units are also in meters. Both histograms are divided into 10 intervals for a clearer view of the data distribution. If you have any more questions or need further details, feel free to ask!

Prompt 7/ Can it supply information not read from the SWMM5 inp file but derived from the inp data?

My Prompt - Now make a mean, min and max CFL value where CFL is length / (velocity + (9.8*Depth)^1/2) assuming a velocity of 1, 3 and 5 m/sec

The Courant-Friedrichs-Lewy (CFL) time step plays a pivotal role in the SWMM5 (Storm Water Management Model 5) simulation process. It serves as the foundation for the variable time step employed during the simulation, exerting a significant influence on two crucial aspects: the speed of the simulation and its continuity error. In essence, the CFL time step is a balancing act that optimizes both the computational efficiency and the accuracy of the simulation results.

Additionally, the CFL time step governs the time intervals used to generate summary tables. It's worth noting that if the CFL time step is set to a very small value, the number of time steps between the reported graphical intervals may be exceedingly large, which could impact the granularity and readability of the summary tables.

Yes, it can make estimates of the CFL time steps based on the velocity assumption and the pipe length and maximum diameter. The CFL values have been successfully calculated for velocities of 1 m/s, 3 m/s, and 5 m/s. Here are the mean, max, and min values for each set:

For a velocity of 1 m/s:

• Mean CFL: 37.25
• Max CFL: 174.89
• Min CFL: 0.47

For a velocity of 3 m/s:

• Mean CFL: 29.33
• Max CFL: 109.68
• Min CFL: 0.38

For a velocity of 5 m/s:

• Mean CFL: 24.35
• Max CFL: 90.19
• Min CFL: 0.32

Prompt 8/ Fantastic, but how does that compare to the values actually used by SWMM5 during the Simulation?

Very well, the CFL estimate is based on the full depth and the CFL during the simulation is based on the current velocity and time step depth. Chat GPT has given us a good starting point for the routing time step.

Prompt 9/ Can we also read the text report file of SWMM5?

My Prompt - Show me all of the output tables in the file I just uploaded that are bracketed by asterisk lines.

Yes, it both reads the data and finds the tables. Note this includes the input file echo summary.

Here are the output tables in the report file that are bracketed by asterisk lines:

Element Count
Pollutant Summary
Landuse Summary
Raingage Summary
Subcatchment Summary
LID Control Summary
Node Summary
Link Summary
Cross Section Summary
Shape Summary
Transect Summary
Analysis Options
Rainfall Dependent I/I
Runoff Quantity Continuity
Runoff Quality Continuity
Groundwater Continuity
Flow Routing Continuity
Quality Routing Continuity
Highest Continuity Errors
Time-Step Critical Elements
Highest Flow Instability Indexes
Most Frequent Nonconverging Nodes
Routing Time Step Summary
Subcatchment Runoff Summary
LID Performance Summary
Groundwater Summary
Subcatchment Washoff Summary
Node Depth Summary
Node Inflow Summary
Node Surcharge Summary
Node Flooding Summary
Storage Volume Summary
Outfall Loading Summary
Link Flow Summary
Flow Classification Summary
Conduit Surcharge Summary
Pumping Summary
Link Pollutant Load Summary        

Prompt 10/ We can read the output file but can we make something new that is not in the SWMM5 output or input?

My Prompt - Now find the full flow from the cross section summary and the maximum flow from the link flow summary and make a new output called qOverQfull which is maximum flow divided by full flow and then show me a ten bar histogram with the mean, max and min of the new output

Problem, ChatGPT cannot find the right columns so i have to add "in the link flow summary table - the maximum flow is the third column with a header that starts with maximum. In the cross section table the Full flow is the last column and has the word full" Suggestion, CSV files may be better. My internal solution is a new prompt - Okay, can you save what I uploaded to you as a csv file?

Finally, I can extract the data (Q full is large due to the fact there are rivers. " I've successfully captured the "Full Flow" values from the eighth column in lines 728 to 950 of the rpt file. Here are the calculated statistics:

• Mean Full Flow: 864,334.29864,334.29 (cubic feet per second)
• Median Full Flow: 11,878.1311,878.13 (cubic feet per second)
• Max Full Flow: 38,284,487.3938,284,487.39 (cubic feet per second)
• Min Full Flow: 0.00.0 (cubic feet per second)

Prompt 11/ It looks like I have to to specify the start, stop and number of columns for each section.

"The data appears to have a complex header spanning multiple lines, which likely caused the issue when creating the Pandas DataFrame. The actual data starts from the eighth line, with the header information on lines 6 and 7."

End Result - my means of Maximum flow, q/Q and d/D

Column 3 (Maximum Flow_LPS)

• Mean: 5.48?
• Median: 0.49?
• Max: 72.2?
• Min: 0.0?
• ?n: 235

Column 6 (Max_Veloc_m_per_s)

• Mean: 0.179?
• Median: 0.055?
• Max: 1.37?
• Min: 0.0
• ?n: 232

Column 7 (q/Q)

• Mean: 0.00036
• Median: 0.0
• Max: 0.02
• Min: 0.0
• ?n: 222

Column 8 (d/D)

• Mean: 0.0302
• Median: 0.010
• Max: 0.51
• Min: 0.0
• ?n: 222

Prompt 13/ It seems I need to give you more information for the RPT file.

My Prompt - Show me the starting line of each section that has a line of **** around the name of the section, the estimated number of columns for each section, and the link number where the section data starts and ends.

Answer but without the columns

Sections with Asterisks in the Report File
==========================================
Section: Element Count
  - Start Line: 24
  - End Line: 26
  - Estimated Columns: None

Section: Pollutant Summary
  - Start Line: 35
  - End Line: 37
  - Estimated Columns: None

Section: Landuse Summary
  - Start Line: 49
  - End Line: 51
  - Estimated Columns: None

Section: Raingage Summary
  - Start Line: 59
  - End Line: 61
  - Estimated Columns: None

Section: Subcatchment Summary
  - Start Line: 69
  - End Line: 71
  - Estimated Columns: None

Section: LID Control Summary
  - Start Line: 106
  - End Line: 108
  - Estimated Columns: None

Section: Node Summary
  - Start Line: 300
  - End Line: 302
  - Estimated Columns: None

Section: Link Summary
  - Start Line: 480
  - End Line: 482
  - Estimated Columns: None

Section: Cross Section Summary
  - Start Line: 722
  - End Line: 724
  - Estimated Columns: None

Section: Shape Summary
  - Start Line: 953
  - End Line: 955
  - Estimated Columns: None

Section: Transect Summary
  - Start Line: 993
  - End Line: 995
  - Estimated Columns: None

Section: Analysis Options
  - Start Line: 1383
  - End Line: 1385
  - Estimated Columns: None

Section: Highest Continuity Errors
  - Start Line: 1526
  - End Line: 1528
  - Estimated Columns: None

Section: Time-Step Critical Elements
  - Start Line: 1536
  - End Line: 1538
  - Estimated Columns: None

Section: Highest Flow Instability Indexes
  - Start Line: 1542
  - End Line: 1544
  - Estimated Columns: None

Section: Most Frequent Nonconverging Nodes
  - Start Line: 1551
  - End Line: 1553
  - Estimated Columns: None

Section: Routing Time Step Summary
  - Start Line: 1561
  - End Line: 1563
  - Estimated Columns: None

Section: Subcatchment Runoff Summary
  - Start Line: 1578
  - End Line: 1580
  - Estimated Columns: None

Section: LID Performance Summary
  - Start Line: 1619
  - End Line: 1621
  - Estimated Columns: None

Section: Groundwater Summary
  - Start Line: 1815
  - End Line: 1817
  - Estimated Columns: None

Section: Subcatchment Washoff Summary
  - Start Line: 1857
  - End Line: 1859
  - Estimated Columns: None

Section: Node Depth Summary
  - Start Line: 1899
  - End Line: 1901
  - Estimated Columns: None

Section: Node Inflow Summary
  - Start Line: 2082
  - End Line: 2084
  - Estimated Columns: None

Section: Node Surcharge Summary
  - Start Line: 2266
  - End Line: 2268
  - Estimated Columns: None

Section: Node Flooding Summary
  - Start Line: 2279
  - End Line: 2281
  - Estimated Columns: None

Section: Storage Volume Summary
  - Start Line: 2286
  - End Line: 2288
  - Estimated Columns: None

Section: Outfall Loading Summary
  - Start Line: 2314
  - End Line: 2316
  - Estimated Columns: None

Section: Link Flow Summary
  - Start Line: 2332
  - End Line: 2334
  - Estimated Columns: None

Section: Flow Classification Summary
  - Start Line: 2578
  - End Line: 2580
  - Estimated Columns: None

Section: Conduit Surcharge Summary
  - Start Line: 2811
  - End Line: 2813
  - Estimated Columns: None

Section: Pumping Summary
  - Start Line: 2823
  - End Line: 2825
  - Estimated Columns: None

Section: Link Pollutant Load Summary
  - Start Line: 2839
  - End Line: 2841
  - Estimated Columns: None        

Prompt 14/ Let us revisit the INP file based on what we learned.

My Prompt -find all sections that start with a [ and give me the section name, the starting line of the section and the number of lines in each sections, the column labels start with a ; and are on the first line after the section name

Yes, it works but with a lot of work by me,

 Detailed Sections with First Line Column Labels in the INP File
=============================================================
Section: TITLE
  - Start Line: 1
  - Line Count: 4
  - First Line Column Labels: Project Title/Notes

Section: OPTIONS
  - Start Line: 5
  - Line Count: 38
  - First Line Column Labels: Option             Value

Section: EVAPORATION
  - Start Line: 43
  - Line Count: 6
  - First Line Column Labels: Data Source    Parameters

Section: TEMPERATURE
  - Start Line: 49
  - Line Count: 8
  - First Line Column Labels: Data Element     Values

Section: RAINGAGES
  - Start Line: 57
  - Line Count: 7
  - First Line Column Labels: Name           Format    Interval SCF      Source

Section: SUBCATCHMENTS
  - Start Line: 64
  - Line Count: 34
  - First Line Column Labels: Name           Rain Gage        Outlet           Area     %Imperv  Width    %Slope   CurbLen  SnowPack

Section: SUBAREAS
  - Start Line: 98
  - Line Count: 34
  - First Line Column Labels: Subcatchment   N-Imperv   N-Perv     S-Imperv   S-Perv     PctZero    RouteTo    PctRouted

Section: INFILTRATION
  - Start Line: 132
  - Line Count: 34
  - First Line Column Labels: Subcatchment   Param1     Param2     Param3     Param4     Param5

Section: LID_CONTROLS
  - Start Line: 166
  - Line Count: 37
  - First Line Column Labels: Name           Type/Layer Parameters

Section: LID_USAGE
  - Start Line: 203
  - Line Count: 190
  - First Line Column Labels: Subcatchment   LID Process      Number  Area       Width      InitSat    FromImp    ToPerv     RptFile                  DrainTo          FromPerv

Section: AQUIFERS
  - Start Line: 393
  - Line Count: 6
  - First Line Column Labels: Name           Por    WP     FC     Ksat   Kslope Tslope ETu    ETs    Seep   Ebot   Egw    Umc    ETupat

Section: GROUNDWATER
  - Start Line: 399
  - Line Count: 34
  - First Line Column Labels: Subcatchment   Aquifer          Node             Esurf  A1     B1     A2     B2     A3     Dsw    Egwt   Ebot   Wgr    Umc

Section: SNOWPACKS
  - Start Line: 433
  - Line Count: 8
  - First Line Column Labels: Name           Surface    Parameters

Section: JUNCTIONS
  - Start Line: 441
  - Line Count: 160
  - First Line Column Labels: Name           Elevation  MaxDepth   InitDepth  SurDepth   Aponded

Section: OUTFALLS
  - Start Line: 601
  - Line Count: 10
  - First Line Column Labels: Name           Elevation  Type       Stage Data       Gated    Route To

Section: DIVIDERS
  - Start Line: 611
  - Line Count: 5
  - First Line Column Labels: Name           Elevation  Diverted Link    Type       Parameters

Section: STORAGE
  - Start Line: 616
  - Line Count: 25
  - First Line Column Labels: Name           Elev.    MaxDepth   InitDepth  Shape      Curve Type/Params            SurDepth  Fevap    Psi      Ksat     IMD

Section: CONDUITS
  - Start Line: 641
  - Line Count: 231
  - First Line Column Labels: Name           From Node        To Node          Length     Roughness  InOffset   OutOffset  InitFlow   MaxFlow

Section: PUMPS
  - Start Line: 872
  - Line Count: 13
  - First Line Column Labels: Name           From Node        To Node          Pump Curve       Status   Sartup Shutoff

Section: ORIFICES
  - Start Line: 885
  - Line Count: 7
  - First Line Column Labels: Name           From Node        To Node          Type         Offset     Qcoeff     Gated    CloseTime

Section: WEIRS
  - Start Line: 892
  - Line Count: 8
  - First Line Column Labels: Name           From Node        To Node          Type         CrestHt    Qcoeff     Gated    EndCon   EndCoeff   Surcharge  RoadWidth  RoadSurf   Coeff. Curve

Section: OUTLETS
  - Start Line: 900
  - Line Count: 6
  - First Line Column Labels: Name           From Node        To Node          Offset     Type            QTable/Qcoeff    Qexpon     Gated

Section: XSECTIONS
  - Start Line: 906
  - Line Count: 233
  - First Line Column Labels: Link           Shape        Geom1            Geom2      Geom3      Geom4      Barrels    Culvert

Section: TRANSECTS
  - Start Line: 1139
  - Line Count: 110
  - First Line Column Labels: Transect Data in HEC-2 format

Section: LOSSES
  - Start Line: 1249
  - Line Count: 227
  - First Line Column Labels: Link           Kentry     Kexit      Kavg       Flap Gate  Seepage

Section: CONTROLS
  - Start Line: 1476
  - Line Count: 53
  - First Line Column Labels: None

Section: POLLUTANTS
  - Start Line: 1529
  - Line Count: 10
  - First Line Column Labels: Name           Units  Crain      Cgw        Crdii      Kdecay     SnowOnly   Co-Pollutant     Co-Frac    Cdwf       Cinit

Section: LANDUSES
  - Start Line: 1539
  - Line Count: 7
  - First Line Column Labels: Sweeping   Fraction   Last

Section: COVERAGES
  - Start Line: 1546
  - Line Count: 35
  - First Line Column Labels: Subcatchment   Land Use         Percent

Section: LOADINGS
  - Start Line: 1581
  - Line Count: 4
  - First Line Column Labels: Subcatchment   Pollutant        Buildup

Section: BUILDUP
  - Start Line: 1585
  - Line Count: 16
  - First Line Column Labels: Land Use       Pollutant        Function   Coeff1     Coeff2     Coeff3     Per Unit

Section: WASHOFF
  - Start Line: 1601
  - Line Count: 16
  - First Line Column Labels: Land Use       Pollutant        Function   Coeff1     Coeff2     SweepRmvl  BmpRmvl

Section: INFLOWS
  - Start Line: 1617
  - Line Count: 11
  - First Line Column Labels: Node           Constituent      Time Series      Type     Mfactor  Sfactor  Baseline Pattern

Section: DWF
  - Start Line: 1628
  - Line Count: 142
  - First Line Column Labels: Node           Constituent      Baseline   Patterns

Section: HYDROGRAPHS
  - Start Line: 1770
  - Line Count: 41
  - First Line Column Labels: Hydrograph     Rain Gage/Month  Response R        T        K        Dmax     Drecov   Dinit

Section: RDII
  - Start Line: 1811
  - Line Count: 59
  - First Line Column Labels: Node           Unit Hydrograph  Sewer Area

Section: CURVES
  - Start Line: 1870
  - Line Count: 112
  - First Line Column Labels: Name           Type       X-Value    Y-Value

Section: TIMESERIES
  - Start Line: 1982
  - Line Count: 6204
  - First Line Column Labels: Name           Date       Time       Value

Section: PATTERNS
  - Start Line: 8186
  - Line Count: 35
  - First Line Column Labels: Name           Type       Multipliers

Section: REPORT
  - Start Line: 8221
  - Line Count: 7
  - First Line Column Labels: Reporting Options

Section: TAGS
  - Start Line: 8228
  - Line Count: 2
  - First Line Column Labels: None

Section: MAP
  - Start Line: 8230
  - Line Count: 4
  - First Line Column Labels: None

Section: COORDINATES
  - Start Line: 8234
  - Line Count: 176
  - First Line Column Labels: Node           X-Coord            Y-Coord

Section: VERTICES
  - Start Line: 8410
  - Line Count: 181
  - First Line Column Labels: Link           X-Coord            Y-Coord

Section: Polygons
  - Start Line: 8591
  - Line Count: 5460
  - First Line Column Labels: Subcatchment   X-Coord            Y-Coord

Section: SYMBOLS
  - Start Line: 14051
  - Line Count: 5
  - First Line Column Labels: Gage           X-Coord            Y-Coord
        

Prompt 15/ Fantastic, but do i have to copy and paste all of this information?

No, you can save the work to a document, csv or text file. You have to download it soon, however, or it seems to go away.