Runoff.hpp File Reference

Subcatchment runoff generation — batch-oriented nonlinear reservoir. More...

#include "../data/SubcatchData.hpp"
#include "Infiltration.hpp"
#include <vector>

Include dependency graph for Runoff.hpp:

This graph shows which files directly or indirectly include this file:

Go to the source code of this file.

Classes
struct	openswmm::runoff::RunoffSoA
class	openswmm::runoff::RunoffSolver

Namespaces
namespace	openswmm
namespace	openswmm::runoff

Variables
constexpr double	openswmm::runoff::MEXP = 5.0 / 3.0
	Manning's exponent.
constexpr double	openswmm::runoff::ODETOL = 0.0001
	ODE solver tolerance (matching legacy)
constexpr double	openswmm::runoff::PHI = 1.486
	Manning's US customary constant.

Detailed Description

Subcatchment runoff generation — batch-oriented nonlinear reservoir.

Three subareas per subcatchment (matching legacy subcatch.c):

• IMPERV0: Impervious with zero depression storage (PctZero fraction)
• IMPERV1: Impervious with depression storage
• PERV: Pervious with depression storage and infiltration

Depth integration uses RK45 adaptive ODE solver (matching legacy odesolve.c) for implicit solution of: dd/dt = inflow - alpha * (d - Ds)^(5/3)

Note

Legacy reference: src/legacy/engine/runoff.c, subcatch.c, odesolve.c

Author

Caleb Buahin caleb.nosp@m..bua.nosp@m.hin@g.nosp@m.mail.nosp@m..com

Copyright

Copyright (c) 2026 HydroCouple. All rights reserved.

License\n MIT License