DegreeDaySnow.hpp File Reference

Snowmelt — degree-day and rain-on-snow methods. More...

#include <cstddef>
#include <vector>
#include "SnowModel.hpp"

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Classes
struct	openswmm::snow::SnowSoA
class	openswmm::snow::DegreeDaySnow

Namespaces
namespace	openswmm
namespace	openswmm::snow
namespace	openswmm::surface

Typedefs
using	openswmm::snow::SnowSolver = DegreeDaySnow
using	openswmm::surface::DegreeDaySnow = snow::DegreeDaySnow

Variables
constexpr int	openswmm::snow::N_SUBAREAS = 3
	Plowable, Impervious, Pervious.
constexpr int	openswmm::snow::SNOW_PLOWABLE = 0
constexpr int	openswmm::snow::SNOW_IMPERV = 1
constexpr int	openswmm::snow::SNOW_PERV = 2

Detailed Description

Snowmelt — degree-day and rain-on-snow methods.

Batch-oriented: all snowpack computations use the same daily temperature/wind. The per-subcatchment snowmelt calculation is independent and vectorisable. Three subareas (plowable, imperv, perv) are processed per subcatchment — inner loop can be unrolled.

Key vectorisable operations:

• ATI update: ati += tipm * (Ta - ati) → batch over subcatchments
• Degree-day melt: smelt = dhm * (Ta - Tbase) → batch over subcatchments
• Cold content update: cc += rnm * dhm * (ati - Ta) * dt → batch
• Snow accumulation: wsnow += snowfall * dt → batch

Note

Legacy reference: src/legacy/engine/snow.c

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

Apache-2.0