openswmm::rdii Namespace Reference

Classes
struct	ExpDecayParams
struct	RDIIGroupSoA
class	RDIISolver
	Mutable strict-grid UH convolution, rainfall queues and node-flow history. Configure validated UH/decay/assignment rows before init. Serialize all access; advance mutates queues, abstraction, optional SWE and context balance totals. Stored float32 grid rows grow for the whole run; no streaming eviction/rollback. Direct public uh_params/decay_params edits require compatible layout and a fresh initialization before reuse. Exceptions can leave partial changes. More...
struct	UHResponseData
struct	UnitHydParams

Functions
double	getRecoveryRate (const ExpDecayParams &dp, double T_celsius)
	Compute exponential-IA additive recovery at one air temperature.
double	updateIA_exp (const UnitHydParams &uh, UHResponseData &rd, const ExpDecayParams &dp, int month, int response, double rainDepth, double dt_sec, const SimulationContext &ctx)
	Update exponential abstraction and optional degree-day SWE for one rain chunk.

Function Documentation

getRecoveryRate()

double openswmm::rdii::getRecoveryRate	(	const ExpDecayParams &	dp,
		double	T_celsius )

Compute exponential-IA additive recovery at one air temperature.

Parameters

dp	Finite qualified 1/hour base/thermal rates, Celsius reference/freeze thresholds and inverse-Celsius sensitivity; active is not tested here.
T_celsius	Finite air temperature Celsius.

Returns

Zero strictly below freeze threshold; otherwise max(0,k_0+k_T*exp(theta_rec *(T-T_ref))) in 1/hour. Equality at freeze permits recovery. Does not clamp exponent overflow or validate parameters, consume time or mutate state.

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updateIA_exp()

double openswmm::rdii::updateIA_exp	(	const UnitHydParams &	uh,
		UHResponseData &	rd,
		const ExpDecayParams &	dp,
		int	month,
		int	response,
		double	rainDepth,
		double	dt_sec,
		const SimulationContext &	ctx )

Update exponential abstraction and optional degree-day SWE for one rain chunk.

Parameters

	uh	Qualified monthly response parameters; iaMax is project rain-depth units.
[in,out]	rd	Current used-abstraction and optional SWE in the same project units. Does not modify rainfall circular buffers/dry counters.
	dp	Qualified exponential/snow coefficients; active is not checked here.
	month	Nonnegative zero-based month, reduced modulo 12.
	response	Nonnegative SHORT/MEDIUM/LONG index, reduced modulo three.
	rainDepth	Finite nonnegative precipitation depth in project rain-depth units.
	dt_sec	Finite positive chunk seconds.
	ctx	Borrowed climate state; configured temperature is Fahrenheit converted to Celsius, otherwise uses dp.T_ref without sampling any new climate time.

Returns

Nonnegative liquid excess in project depth units. Optional snow accumulates all input at T<=snow_T (then follows recovery); above threshold, bounded SWE melt is added before wet abstraction. Wet available IA decays exp(-k_dep*rainDepth), used IA increases by the computed change, and returned excess is clipped to zero. The computed abstraction is not additionally bounded by rainDepth, so this helper does not guarantee per-chunk mass closure for arbitrary coefficients. Dry IA recovers exponentially in hours, suppressed strictly below freeze. No argument/ finite/overflow validation, transaction or global water/clock bookkeeping.

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