Classes
struct	GWContext

struct	GWSoA

class	GWSolver
	Mutable two-zone groundwater state with independent scalar per-subcatchment RKF45. One owning simulation thread serializes init/execute/state edits. Initialization supplies defaults only; model loading must populate physical aquifer parameters and compile/bind optional expressions before stepping. No transactional rollback or per-call integration failure result is exposed. More...

Enumerations
enum	GWVar : int { GWV_HGW = 0 , GWV_HSW = 1 , GWV_HCB = 2 , GWV_HGS = 3 , GWV_KS = 4 , GWV_K = 5 , GWV_THETA = 6 , GWV_PHI = 7 , GWV_FI = 8 , GWV_FU = 9 , GWV_A = 10 , GWV_MAX = 11 }
	GW expression variable indices (matching legacy GWvariables enum). More...

Functions
int	gwf_validate (const std::string &expr, std::string &msg, int &col)
	Validate a GWF expression and probe the production parser without storing it.

Enumeration Type Documentation

◆ GWVar

GW expression variable indices (matching legacy GWvariables enum).

Enumerator
GWV_HGW	Water table height.
GWV_HSW	Surface water head.
GWV_HCB	Channel bottom height (h_star)
GWV_HGS	Ground surface height (total_depth)
GWV_KS	Saturated conductivity.
GWV_K	Unsaturated conductivity.
GWV_THETA	Upper zone moisture content.
GWV_PHI	Porosity.
GWV_FI	Surface infiltration rate.
GWV_FU	Upper zone percolation rate.
GWV_A	Subcatchment area.
GWV_MAX

int openswmm::groundwater::gwf_validate	(	const std::string &	expr,
		std::string &	msg,
		int &	col )

Validate a GWF expression and probe the production parser without storing it.

Parameters

	expr	Borrowed arithmetic text; empty/whitespace-only is invalid. Supports numbers, variable identifiers, known functions, parentheses, comma and + - * / ^. Identifiers are case insensitive; legacy variable names may be prefixes of a longer identifier (e.g. HGWW resolves HGW, Area resolves A).
[out]	msg	Cleared on entry/success, otherwise human-readable rejection.
[out]	col	Zero-based byte position or -1 for unattributed/internal failure; not a Unicode code-point column. Text/token positions must fit int.

Returns: Zero when strict grammar and a production parse both accept, -1 otherwise. Checks function arity (min/max two, others one), operator sequencing, unary minus and balanced parentheses. Unary plus is rejected. Numeric overflow to infinity is not explicitly refused by tokenization. Does not evaluate, check units/physics, bind variables or retain the compiled probe. Catches parser/allocation exceptions into an internal diagnostic where possible.

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double openswmm::constants::ode::GWTOL

constexpr

Groundwater ODE tolerance.

double openswmm::constants::XTOL

constexpr

Tolerance for bounding state variables.