Table 1.

Parameters in the model.

	Definition	Unit	Value	References
S	Susceptible population	People	S(0) = 2.3 × 106 - fixed	(Wu et al., 2022b)
E	Exposed population	People	E(0)−fitting
I	Infectious population	People	I(0) = 0 - fixed
λ	Transmission rate	Per day per person	Fitting
1/k	Exposed duration	Day	3 days	Wölfel et al., 2020; Killingley et al., 2022; Wu et al., 2022a; Van Kampen et al., 2021;
1/δ	Infectious duration	Day	8 days	Wölfel et al., 2020, Killingley et al., 2022, Wu et al., 2022a; Van Kampen et al., 2021
α	Fecal load	Gram	51–796 g - fitting	Rose et al., 2015
β	Viral shedding in stool	Viral RNA copies per gram	Fitting
γ	Fraction of viral loss in sewer	Per day	Fitting and estimated
ω1	Magnitude modifier	log10 viral RNA per g day	Fitting
ω2	Peak timing for viral shedding	Day	4 day - fixed	Killingley et al., 2022; Wu et al., 2022a.

Note that β and ω₁ are obtained from fitting to viral shedding data in stool (Wölfel et al., 2020).