WatershedCommon.hpp File Reference

The arriving-water rate at a subarea — shared by every species track on the watershed surface. More...

#include <cstddef>

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Namespaces
namespace	openswmm
namespace	openswmm::transport

Functions
double	openswmm::transport::arrivingPrecipRate (const SimulationContext &ctx, std::size_t ui, int subarea) noexcept
	Net precipitation actually reaching one subarea this step [ft/s].
double	openswmm::transport::arrivingMeltFraction (const SimulationContext &ctx, std::size_t ui, int subarea) noexcept
	Fraction of the arriving water that is MELTWATER, in [0, 1].
double	openswmm::transport::arrivingPrecipTemperature (const SimulationContext &ctx, std::size_t ui, int subarea) noexcept
	Temperature of the water arriving at one subarea [°C] (S2).
double	openswmm::transport::arrivingPrecipAge (const SimulationContext &ctx, std::size_t ui, int subarea) noexcept
	Water age of the water arriving at one subarea [seconds] (S2b).

Variables
constexpr int	openswmm::transport::kSubIMPERV0 = 0
constexpr int	openswmm::transport::kSubIMPERV1 = 1
constexpr int	openswmm::transport::kSubPERV = 2
constexpr double	openswmm::transport::kMeltwaterTempC = 0.0

Detailed Description

The arriving-water rate at a subarea — shared by every species track on the watershed surface.

A3 and H5a each read ctx.subcatches.rainfall as "how much water landed on this subarea this step". On a subcatchment with a SNOWPACK that is the wrong field, and wrong in two directions at once. This header is the one place that knows which field is right, so the two tracks cannot drift apart on it — the LidLayerCommon move, for the same reason.

See also

plans/transport/SNOW_MIXING_VOLUME_FINDING_2026-08-20.md

Author

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

Copyright

Copyright (c) 2026 Caleb Buahin. All rights reserved.

License\n Apache-2.0