Exploring EPASWMM5 Code Variables Through the Lens of Visual AI (w/Emoji)

In this approach to understand the SWMM 5.2.4 C code, particularly the .h files, a visual representation using emojis was created. This project, executed by GPT-4, provides a unique and engaging perspective on some of the main constants and data objects in the software. To maintain focus, the visualization was limited to ten key sections. Below is a summary of these sections:

1. ?? Data Objects in SWMM5: Representation of various data objects used in SWMM5.
2. ?? Input Option Types for SWMM5: Types of input options available for configuring the model.
3. SWMM5 ?? Input Section Types: Different input sections encountered in the model's configuration.
4. ?? Cross Section Shape Types: Shapes for cross-sections of channels, pipes, or other structures.
5. Constants in SWMM5: Fundamental constants used throughout the program.
6. Computed SWMM5 Output Quantities: Enumerated computed results for subcatchments, nodes, links, and system-wide metrics.
7. Constants for Link Flow, Buildup/Washoff, Time Series and Runoff: Specific constants related to flow dynamics, pollution Buildup, and Washoff.
8. SWMM 5.2.4 Control Constants Overview ??: Overview of control constants in the software.
9. Infiltration Constants: Constants related to the infiltration processes in the model.
10. ?? SWMM5 Calibration Files Overview ??: Overview of calibration files and their significance in the model.

Section 1 - ?? Data Objects in SWMM5

???? Data Objects:

• Temp (TTemp): ??? Temperature data ?? ???
• Evap (TEvap): ?? Evaporation data ?? ????
• Wind (TWind): ??? Wind speed data ?? ???
• Snow (TSnow): ?? Snow melt data ?? ??
• Adjust (TAdjust): ?? Climate adjustments ?? ??
• Snowmelt (TSnowmelt):* ??? Array of snow melt objects ?? ???
• Gage (TGage):* ??? Array of rain gages ?? ???
• Subcatch (TSubcatch):* ??? Array of subcatchments ?? ???
• Aquifer (TAquifer):* ?? Array of groundwater aquifers ?? ??
• UnitHyd (TUnitHyd):* ?? Array of unit hydrographs ?? ??
• Node (TNode):* ?? Array of nodes ?? ??
• Outfall (TOutfall):* ?? Array of outfall nodes ?? ??
• Divider (TDivider):* ? Array of divider nodes ?? ?
• Storage (TStorage):* ?? Array of storage nodes ?? ??
• Link (TLink):* ?? Array of links ?? ??
• Conduit (TConduit):* ?? Array of conduit links ?? ??
• Pump (TPump):* ??? Array of pump links ?? ???
• Orifice (TOrifice):* ? Array of orifice links ?? ?
• Weir (TWeir):* ?? Array of weir links ?? ??
• Outlet (TOutlet):* ??? Array of outlet device links ?? ???
• Pollut (TPollut):* ?? Array of pollutants ?? ??
• Landuse (TLanduse):* ?? Array of land uses ?? ??
• Pattern (TPattern):* ?? Array of time patterns ?? ??
• Curve (TTable):* ?? Array of curve tables ?? ??
• Tseries (TTable):* ??? Array of time series tables ?? ???
• Transect (TTransect):* ?? Array of transect data ?? ??
• Street (TStreet):* ??? Array of defined street cross-sections ?? ???
• Shape (TShape):* ?? Array of custom conduit shapes ?? ??
• Event (TEvent):* ?? Array of routing events ?? ??

Section 2 - ?? Input Option Types for SWMM5

?? Input Option Types: Types of input options available for configuring a stormwater management model.

• FLOW_UNITS: Units for flow measurements. ?? ??
• INFIL_MODEL: Infiltration model selection. ?? ??
• ROUTE_MODEL: Routing model selection. ?? ??♂?
• START_DATE: Simulation start date. ?? ??
• START_TIME: Simulation start time. ?? ??
• END_DATE: Simulation end date. ?? ??
• END_TIME: Simulation end time. ?? ??
• REPORT_START_DATE: Start date for report generation. ?? ????
• REPORT_START_TIME: Start time for report generation. ?? ????
• SWEEP_START: Street cleaning start month. ?? ?????
• SWEEP_END: Street cleaning end month. ?? ????
• START_DRY_DAYS: Initial dry days before simulation. ?? ????
• WET_STEP: Time step for wet weather conditions. ?? ?????
• DRY_STEP: Time step for dry weather conditions. ?? ????
• ROUTE_STEP: Time step for routing. ?? ??♂???
• RULE_STEP: Time step for control rule processing. ?? ????
• REPORT_STEP: Time step for report generation. ?? ????
• ALLOW_PONDING: Flag to allow water ponding in conditions. ?? ????
• INERT_DAMPING: Inertia damping option for flow calculations. ?? ????
• SLOPE_WEIGHTING: Weighting of slope in flow calculations. ?? ????
• VARIABLE_STEP: Allow variable time step option. ?? ?
• NORMAL_FLOW_LTD: Limit for normal flow conditions. ?? ????
• LENGTHENING_STEP: Time step lengthening factor. ?? ????
• MIN_SURFAREA: Minimum surface area for stability. ?? ????
• COMPATIBILITY: Model compatibility mode. ?? ??
• SKIP_STEADY_STATE: Skip initial steady-state phase. ?? ????
• TEMPDIR: Temporary directory for intermediate files. ?? ????
• IGNORE_RAINFALL: Ignore rainfall data during simulation. ?? ?????
• FORCE_MAIN_EQN: Equation type for force main calculations. ?? ??=?
• LINK_OFFSETS: Offset method for links. ?? ????
• MIN_SLOPE: Minimum slope for channels/pipes. ?? ????
• IGNORE_SNOWMELT: Ignore snowmelt data during simulation. ?? ????
• IGNORE_GWATER: Ignore groundwater during simulation. ?? ???
• IGNORE_ROUTING: Ignore routing processes during simulation. ?? ????♂?
• IGNORE_QUALITY: Ignore water quality processes. ?? ????
• MAX_TRIALS: Maximum trials for iterative methods. ?? ????
• HEAD_TOL: Tolerance for hydraulic head calculations. ?? ????
• SYS_FLOW_TOL: System flow tolerance for balance. ?? ????
• LAT_FLOW_TOL: Lateral flow tolerance for balance. ?? ??????
• IGNORE_RDII: Ignore RDII data. ?? ???????
• MIN_ROUTE_STEP: Minimum routing time step. ?? ??♂??
• NUM_THREADS: Number of computational threads. ?? ????
• SURCHARGE_METHOD: Method for calculating surcharge. ?? ????

Section 3 - SWMM5 ?? Input Section Types

?? Input Section Types: Types of input sections in a stormwater management model configuration or input file.

• s_TITLE: Title/header of the model/data. ?? ??
• s_OPTION: Model/simulation options. ?? ??
• s_FILE: File references/paths. ?? ??
• s_RAINGAGE: Rainfall measurement devices. ?? ???
• s_TEMP: Temperature data/settings. ?? ???
• s_EVAP: Evaporation parameters/data. ?? ??
• s_SUBCATCH: Subcatchment definitions. ?? ??
• s_SUBAREA: Sub-area properties within subcatchment. ?? ??
• s_INFIL: Infiltration parameters. ?? ??
• s_AQUIFER: Groundwater aquifer properties. ?? ??
• s_GROUNDWATER: Groundwater related data/settings. ?? ?
• s_SNOWMELT: Snowmelt parameters/data. ?? ??
• s_JUNCTION: Junction nodes in drainage system. ?? ?
• s_OUTFALL: Outfall nodes/discharge points. ?? ??
• s_STORAGE: Storage unit definitions (ponds/reservoirs). ?? ??
• s_DIVIDER: Flow dividers/splitting nodes. ?? ??
• s_CONDUIT: Conveyance channels/pipes. ?? ??
• s_PUMP: Pump stations/facilities. ?? ??
• s_ORIFICE: Orifice flow control structures. ?? ?
• s_WEIR: Weir flow control structures. ?? ??
• s_OUTLET: Outlet structures/nodes. ?? ??
• s_XSECTION: Cross-sectional properties of channels/pipes. ?? ??
• s_TRANSECT: Irregular channel cross-sectional data. ?? ??
• s_LOSSES: Conveyance loss parameters. ?? ?
• s_CONTROL: Control rules/logic for system. ?? ???
• s_POLLUTANT: Pollutant definitions/properties. ?? ??
• s_LANDUSE: Land use categories/properties. ?? ??
• s_BUILDUP: Pollutant buildup settings. ?? ??
• s_WASHOFF: Pollutant washoff parameters. ?? ??
• s_COVERAGE: Land use coverage data. ?? ??
• s_INFLOW: External inflow data/settings. ?? ??
• s_DWF: Dry weather flow parameters. ?? ??
• s_PATTERN: Repeating patterns for parameters. ?? ??
• s_RDII: Rainfall-dependent inflow/infiltration data. ?? ?????
• s_UNITHYD: Unit hydrograph definitions. ?? ??
• s_LOADING: Pollutant loading data. ?? ??
• s_TREATMENT: Treatment facility/mechanism definitions. ?? ??
• s_CURVE: Generic curve data (e.g., pump curves). ?? ??
• s_TIMESERIES: Time series data/references. ?? ??
• s_REPORT: Reporting options/settings. ?? ??
• s_COORDINATE: Geographical coordinates. ?? ??
• s_VERTICES: Vertices for irregular shapes/paths. ?? ?
• s_POLYGON: Polygonal area definitions. ?? ?
• s_LABEL: Labels/annotations. ?? ???
• s_SYMBOL: Symbols/icons. ?? ??
• s_BACKDROP: Backdrop/background settings. ?? ???
• s_TAG: Tags/metadata. ?? ???
• s_PROFILE: Profile views/settings. ?? ??
• s_MAP: Map data/settings. ?? ???
• s_LID_CONTROL: Low Impact Development control parameters. ?? ??
• s_LID_USAGE: Usage settings for Low Impact Development controls. ?? ??
• s_GWF: Groundwater flow settings. ?? ?
• s_ADJUST: Adjustment/calibration parameters. ?? ??
• s_EVENT: Specific rainfall/other events. ?? ???
• s_STREET: Street/roadway properties. ?? ???
• s_INLET_USAGE: Usage settings for street inlets. ?? ???
• s_INLET: Inlet design/properties. ?? ??

Section 4 - ?? Cross Section Shape Types

?? Cross Section Shape Types: Different shapes for cross-sections of conveyance structures in the stormwater system.

• DUMMY: 0?? Placeholder or undefined shape.
• CIRCULAR: ?? 1?? Closed circle.
• FILLED_CIRCULAR: ?? 2?? Filled circle (with substance/obstruction).
• RECT_CLOSED: ?? 3?? Closed rectangle.
• RECT_OPEN: ?? 4?? Open rectangle (like a trench).
• TRAPEZOIDAL: ?? 5?? Trapezoid shape.
• TRIANGULAR: ?? 6?? Triangle shape.
• PARABOLIC: ?? 7?? Parabola shape.
• POWERFUNC: 8?? Shape defined by a power function.
• RECT_TRIANG: ?? 9?? Combination of rectangle and triangle.
• RECT_ROUND: ?? 1??0?? Rounded rectangle.
• MOD_BASKET: ?? 1??1?? Modified basket shape.
• HORIZ_ELLIPSE: ?? 1??2?? Horizontal ellipse (closed).
• VERT_ELLIPSE: ?? 1??3?? Vertical ellipse (closed).
• ARCH: ?? 1??4?? Arch shape (closed).
• EGGSHAPED: ?? 1??5?? Egg-shaped (closed).
• HORSESHOE: ?? 1??6?? Horseshoe shape (closed).
• GOTHIC: ? 1??7?? Gothic arch shape (closed).
• CATENARY: ?? 1??8?? Catenary curve shape (closed).
• SEMIELLIPTICAL: ?? 1??9?? Semi-elliptical shape (closed).
• BASKETHANDLE: ?? 2??0?? Basket handle shape (closed).
• SEMICIRCULAR: ?? 2??1?? Semi-circular shape (closed).
• IRREGULAR: ? 2??2?? Irregular or undefined shape.
• CUSTOM: ?? 2??3?? Custom shape (closed).
• FORCE_MAIN: ?? 2??4?? Main force/pressure pipe shape (closed).
• STREET_XSECT: ??? 2??5?? Street cross-section.

Section 5 - Constants in SWMM5

?? General Constants: These constants are fundamental values used throughout the program:

• VERSION: 52000 ?? ???? (Software version)
• MAGICNUMBER: 516114522 ?? ??? (Unique identifier)
• EOFMARK: 0x1A ?? ???? (End-of-file mark)
• MAXTITLE: 3 ?? ???? (Maximum title lines)
• MAXMSG: 1024 ?? ???? (Max message text characters)
• MAXLINE: 1024 ?? ???? (Max characters per input line)
• MAXFNAME: 259 ?? ???? (Max file name characters)
• MAXTOKS: 40 ?? ???? (Max items per input line)
• MAXSTATES: 10 ?? ???? (Max hydraulic variables)
• MAXODES: 4 ?? ???? (Max ODE's)
• NA: -1 ?? ???? (Not applicable code)
• TRUE: 1 ?? ? (True state)
• FALSE: 0 ?? ? (False state)
• BIG: 1.E10 ?? ???? (Large value)
• TINY: 1.E-6 ?? ???? (Small value)
• ZERO: 1.E-10 ?? 0?? (Zero value)
• MISSING: -1.E10 ?? ??? (Missing value code)
• PI: 3.141592654 ?? Ï€ (Value of pi)
• GRAVITY: 32.2 ?? ???? (Gravity in US units)
• SI_GRAVITY: 9.81 ?? ?????? (Gravity in SI units)

?? Hydraulic Constants: These constants pertain to hydrological and hydraulic calculations:

• PHI: 1.486 ?? ???? (Manning Equation factor)
• MIN_RUNOFF_FLOW: 0.001 ?? ???? (Minimal runoff flow)
• MIN_TOTAL_DEPTH: 0.004167 ?? ???? (Minimal total depth)
• FLOW_TOL: 0.00001 ?? ????? (Flow tolerance for steady state)
• FUDGE: 0.0001 ?? ???? (Minimum flow depth and area)

?? Conversion Factors: These constants are used for unit conversions:

• GPMperCFS: 448.831 ?? ???? (Gallons/min per cfs)
• AFDperCFS: 1.9837 ?? ???? (Acre-feet/day per cfs)
• MGDperCFS: 0.64632 ?? ???? (Million gallons/day per cfs)
• IMGDperCFS: 0.5382 ?? ?????? (Imperial million gallons/day per cfs)
• LPSperCFS: 28.317 ?? ???? (Liters/sec per cfs)
• LPMperCFS: 1699.0 ?? ???? (Liters/min per cfs)
• CMHperCFS: 101.94 ?? ???? (Cubic meters/hour per cfs)
• CMDperCFS: 2446.6 ?? ???? (Cubic meters/day per cfs)
• MLDperCFS: 2.4466 ?? ???? (Million liters/day per cfs)
• M3perFT3: 0.028317 ?? ???? (Cubic meters per cubic foot)
• LperFT3: 28.317 ?? ???? (Liters per cubic foot)
• MperFT: 0.3048 ?? ???? (Meters per foot)
• PSIperFT: 0.4333 ?? ???? (Pounds/square inch per foot)
• KPAperPSI: 6.895 ?? ???? (Kilopascals per psi)
• KWperHP: 0.7457 ?? ??? (Kilowatts per horsepower)

Section 6 - Computed SWMM5 Output Quantities

?? Computed Subcatchment Quantities: Defining computed results for subcatchments in a stormwater management model.

• SUBCATCH_RAINFALL: Rainfall intensity. ?? ???
• SUBCATCH_SNOWDEPTH: Snow depth. ?? ??
• SUBCATCH_EVAP: Evaporation loss. ?? ??
• SUBCATCH_INFIL: Infiltration loss. ?? ????
• SUBCATCH_RUNOFF: Runoff flow rate. ?? ?????
• SUBCATCH_GW_FLOW: Groundwater flow rate to node. ?? ?
• SUBCATCH_GW_ELEV: Elevation of saturated groundwater table. ?? ???
• SUBCATCH_SOIL_MOIST: Soil moisture. ?? ????
• SUBCATCH_WASHOFF: Pollutant washoff concentration. ?? ????

?? Computed Node Quantities: Defining computed results for nodes in the system.

• NODE_DEPTH: Water depth above invert. ?? ??
• NODE_HEAD: Hydraulic head. ?? ????
• NODE_VOLUME: Volume stored & ponded. ?? ????
• NODE_LATFLOW: Lateral inflow rate. ?? ????
• NODE_INFLOW: Total inflow rate. ?? ????
• NODE_OVERFLOW: Overflow rate. ?? ????
• NODE_QUAL: Concentration of each pollutant. ?? ????

?? Computed Link Quantities: Listing computed results for links in the system.

• LINK_FLOW: Flow rate. ?? ????
• LINK_DEPTH: Flow depth. ?? ????
• LINK_VELOCITY: Flow velocity. ?? ????
• LINK_VOLUME: Link volume. ?? ????
• LINK_CAPACITY: Ratio of area to full area. ?? ???
• LINK_QUAL: Concentration of each pollutant. ?? ????

?? System-wide Quantities: Defining overall computed results for the entire system.

• SYS_TEMPERATURE: Air temperature. ?? ???
• SYS_RAINFALL: Rainfall intensity. ?? ???
• SYS_SNOWDEPTH: Snow depth. ?? ??
• SYS_INFIL: Infiltration. ?? ????
• SYS_RUNOFF: Runoff flow. ?? ?????
• SYS_DWFLOW: Dry weather inflow. ?? ????
• SYS_GWFLOW: Groundwater inflow. ?? ?
• SYS_IIFLOW: RDII inflow. ?? ?????
• SYS_EXFLOW: External inflow. ?? ????
• SYS_INFLOW: Total lateral inflow. ?? ????
• SYS_FLOODING: Flooding outflow. ?? ????
• SYS_OUTFLOW: Outfall outflow. ?? ????
• SYS_STORAGE: Storage volume. ?? ????
• SYS_EVAP: Evaporation. ?? ??
• SYS_PET: Potential ET. ?? ????

Section 7 - Constants for Link Flow, Buildup/Washoff, Time Series and Runoff

??? Conduit Flow Classifications: Defining various classes of flow within a conduit.

• DRY: Dry conduit. ?? ????
• UP_DRY: Upstream end is dry. ?? ??????
• DN_DRY: Downstream end is dry. ?? ??????
• SUBCRITICAL: Sub-critical flow. ?? ????
• SUPCRITICAL: Super-critical flow. ?? ????
• UP_CRITICAL: Free-fall at upstream end. ?? ??????
• DN_CRITICAL: Free-fall at downstream end. ?? ??????
• MAX_FLOW_CLASSES: Number of flow classes. ?? ????
• UP_FULL: Upstream end is full. ?? ????
• DN_FULL: Downstream end is full. ?? ????
• ALL_FULL: Completely full. ?? ????

??? Runoff Flow Categories: Defining categories of runoff flows.

• RUNOFF_RAINFALL: Rainfall. ?? ???
• RUNOFF_EVAP: Evaporation. ?? ??
• RUNOFF_INFIL: Infiltration. ?? ????
• RUNOFF_RUNOFF: Runoff. ?? ?????
• RUNOFF_DRAINS: LID drain flow. ?? ???
• RUNOFF_RUNON: Runon from outfalls. ?? ????

?? Surface Pollutant Loading Categories: Defining categories for pollutant loading on surfaces.

• BUILDUP_LOAD: Pollutant buildup load. ?? ????
• DEPOSITION_LOAD: Rainfall deposition load. ?? ???????
• SWEEPING_LOAD: Load removed by sweeping. ?? ????
• BMP_REMOVAL_LOAD: Load removed by BMPs. ?? ????
• INFIL_LOAD: Runon load removed by infiltration. ?? ??????
• RUNOFF_LOAD: Load removed by runoff. ?? ???????
• FINAL_LOAD: Load remaining on surface. ?? ????

?? Input Data Options: Defining various types and sources of input data.

• RAINFALL_INTENSITY: Rainfall as intensity. ?? ?????
• RAINFALL_VOLUME: Rainfall as volume. ?? ?????
• CUMULATIVE_RAINFALL: Cumulative rainfall volume. ?? ?????
• NO_TEMP: No temperature data. ?? ?????
• TSERIES_TEMP: Temperatures from time series. ?? ?????
• FILE_TEMP: Temperatures from file. ?? ?????
• MONTHLY_WIND: Monthly varying wind speed. ?? ?????
• FILE_WIND: Wind speed from file. ?? ?????
• CONSTANT_EVAP: Constant evaporation rate. ?? ????
• MONTHLY_EVAP: Monthly varying evaporation. ?? ????
• TIMESERIES_EVAP: Evaporation from time series. ?? ????
• TEMPERATURE_EVAP: Evaporation from daily temperature. ?? ?????
• FILE_EVAP: Evaporation from file. ?? ????
• RECOVERY: Soil recovery pattern. ?? ????
• DRYONLY: Evaporation in dry periods only. ?? ????
• PER_AREA: Buildup per unit area. ?? ????
• PER_CURB: Buildup per curb length. ?? ????
• NO_BUILDUP: No buildup. ?? ????
• POWER_BUILDUP: Power function buildup equation. ?? ??????
• EXPON_BUILDUP: Exponential buildup equation. ?? ??????
• SATUR_BUILDUP: Saturation buildup equation.

Section 8 - SWMM 5.2.4 Control Constants Overview ??

?? Constants Overview:

?? Rule States:

• r_RULE: ??
• r_IF: ?
• r_AND: ??
• r_OR: ??
• r_THEN: ??
• r_ELSE: ??
• r_PRIORITY: ??
• r_VARIABLE: ??
• r_EXPRESSION: ??
• r_ERROR: ?

?? Rule Objects:

• r_GAGE: ??
• r_NODE: ??
• r_LINK: ??
• r_CONDUIT: ??
• r_PUMP: ???
• r_ORIFICE: ?
• r_WEIR: ??
• r_OUTLET: ???
• r_SIMULATION: ??

?? Rule Attributes:

• r_DEPTH: ??
• r_MAXDEPTH: ??
• r_HEAD: ??
• r_VOLUME: ??
• r_INFLOW: ??
• r_FLOW: ??
• r_FULLFLOW: ??
• r_FULLDEPTH: ??
• r_STATUS: ??
• r_SETTING: ??
• r_LENGTH: ??
• r_SLOPE: ??
• r_VELOCITY: ??
• r_TIMEOPEN: ??
• r_TIMECLOSED: ??
• r_TIME: ??
• r_DATE: ??
• r_CLOCKTIME: ???
• r_DAYOFYEAR: ???
• r_DAY: ??
• r_MONTH: ??

?? Rule Relations:

• EQ (Equals): ? (=)
• NE (Not Equals): ? (<>)
• LT (Less Than): ?? (<)
• LE (Less Than or Equal): ↙? (<=)
• GT (Greater Than): ?? (>)
• GE (Greater Than or Equal): ↗? (>=)

??? Rule Settings:

• r_CURVE: ??
• r_TIMESERIES: ???
• r_PID: ???
• r_NUMERIC: ??

??? Misc. Constants:

• ObjectWords: Various objects ??
• AttribWords: Various attributes ??
• RelOpWords: Relation symbols ??
• StatusWords: OFF, ON ??
• ConduitWords: CLOSED, OPEN ??
• SettingTypeWords: Setting types ??
• IntensityWord: "INTENSITY" ??

?Section 9 - Infiltration Constants

????? Enumerated Constants (InfilType):

• ????? HORTON: Horton infiltration
• ???? MOD_HORTON: Modified Horton infiltration
• ???? GREEN_AMPT: Green-Ampt infiltration
• ????? MOD_GREEN_AMPT: Modified Green-Ampt infiltration
• ???? CURVE_NUMBER: SCS Curve Number infiltration

????? Horton Infiltration (THorton):

• f0: double ?? Initial infiltration rate (ft/sec)
• fmin: double ?? Minimum infiltration rate (ft/sec)
• Fmax: double ?? Maximum total infiltration (ft)
• decay: double ? Decay coefficient of infiltration rate (1/sec)
• regen: double ?? Regeneration coefficient of infiltration rate (1/sec)
• tp: double ?? Present time on infiltration curve (sec)
• Fe: double ?? Cumulative infiltration (ft)

???? Green-Ampt Infiltration (TGrnAmpt):

• S: double ?? Average capillary suction (ft)
• Ks: double ?? Saturated conductivity (ft/sec)
• IMDmax: double ?? Maximum soil moisture deficit (ft/ft)
• IMD: double ??? Current initial soil moisture deficit
• F: double ?? Current cumulative infiltrated volume (ft)
• Fu: double ?? Current upper zone infiltrated volume (ft)
• Lu: double ?? Depth of upper soil zone (ft)
• T: double ? Time until start of next rain event (sec)
• Sat: char ?? Saturation flag

???? Curve Number Infiltration (TCurveNum):

• Smax: double ?? Maximum infiltration capacity (ft)
• regen: double ?? Infiltration capacity regeneration constant (1/sec)
• Tmax: double ? Maximum inter-event time (sec)
• S: double ?? Current infiltration capacity (ft)
• F: double ?? Current cumulative infiltration (ft)
• P: double ? Current cumulative precipitation (ft)
• T: double ?? Current inter-event time (sec)
• Se: double ?? Current event infiltration capacity (ft)
• f: double ?? Previous infiltration rate (ft/sec)

Section 10 -??? SWMM5 Calibration Files Overview ??

Calibration files are pivotal in the modeling process, offering a comparison between real-world measurements and simulation outputs. ?? Each file caters to a specific aspect of the water cycle or pollutant transport, allowing for targeted calibration and analysis. ?? Here's what each file typically contains:

• ??? Subcatchment Runoff: Measurements of the volume of runoff generated by each subcatchment, crucial for validating surface water simulations.
• ?? Subcatchment Groundwater Flow: Data on the flow of groundwater into or out of the subcatchment, aiding in calibrating subsurface hydrological models.
• ?? Subcatchment Groundwater Elevation: Records of groundwater levels, which are essential to ensure the accuracy of groundwater table simulations.
• ?? Subcatchment Snow Pack Depth: Information on the depth of snow accumulation, providing insights into seasonal snowmelt and its impact on runoff.
• ?? Subcatchment Pollutant Washoff: Concentrations of pollutants washed off by stormwater, crucial for water quality modeling and pollution control strategies.
• ?? Node Depth: Data on the depth of water at network nodes, reflecting the performance of drainage systems during peak flow conditions.
• ?? Node Lateral Inflow: Measurements of lateral inflows to nodes, often used to fine-tune inflow distribution in complex network models.
• ??♀? Node Flooding: Instances of overflow and flooding from nodes, providing real-world events to test the system's capacity and design thresholds.
• ?? Node Water Quality: Quality parameters at the nodes, ensuring that the simulation accurately reflects pollution levels throughout the network.
• ?? Link Flow: The rate of flow within conduits, fundamental for verifying the hydraulic performance of the modeled conduits.
• ?? Link Velocity: The speed of flow in the conduits, used to assess energy gradients and sediment transport capabilities.
• ?? Link Depth: The water depth in conduits, which is necessary for understanding the filling and capacity usage of the network under various conditions.

Section 10 - Input Section Types: LID Processes and Structures

?? Input Section Types: LID Processes and Structures

Enumerations:

• LidTypes:BIO_CELL: ?? Bio-retention cell.RAIN_GARDEN: ?? Rain garden.GREEN_ROOF: ???? Green roof.INFIL_TRENCH: ?? Infiltration trench.POROUS_PAVEMENT: ??? Porous pavement.RAIN_BARREL: ??? Rain barrel.VEG_SWALE: ?? Vegetative swale.ROOF_DISCON: ???? Roof disconnection.
• TimePeriod:PREVIOUS: ?? Previous time period.CURRENT: ?? Current time period.

Data Structures:

• Surface Layer (TSurfaceLayer): Parameters for the surface layer of an LID practice, such as bioretention cells, including thickness, void fraction, roughness, and slopes.
• Pavement Layer (TPavementLayer): Describes the characteristics of a porous pavement layer including thickness, void fraction, permeability, and clogging factors.
• Soil Layer (TSoilLayer): Details of a soil layer in an LID unit, including its thickness, porosity, field capacity, and hydraulic properties.
• Storage Layer (TStorageLayer): Defines a storage layer's parameters such as thickness, void fraction, hydraulic conductivity, and clogging aspects.
• Drain Layer (TDrainLayer): Parameters for underdrain systems in LID units, including coefficients, offsets, and flow equations.
• Drain Mat Layer (TDrainMatLayer): Characteristics of drainage mats typically used in green roofs, including thickness, void fraction, and roughness.
• LID Process (TLidProc): A comprehensive structure representing a generic LID design, encompassing various layers and drainage systems.
• Water Balance Statistics (TWaterBalance): Tracks water balance components like inflow, evaporation, infiltration, and surface runoff in an LID unit.
• LID Report File (TLidRptFile): Structure for storing detailed reporting information for LID processes.
• LID Unit (TLidUnit): Represents a specific LID process applied over an area, containing details about the unit's design, area, inflow, and performance statistics.

Closing Note: Thank you so much for journeying with me through this content. This space is reserved for future updates and insights. Your engagement and time are truly appreciated. Until next time!