Table 1.

Model parameter descriptions, initial ranges based on literature, and calibrated values.

Parameter	Description	Initial range	Calibrated
Eff.1 [0–1]	BOD efficiency primary treatment	0.35–0.75	0.50
Eff.2 [0–1]	BOD efficiency secondary treatment – applied also to high density livestock treatment	0.8–0.95	0.94
Eff.3 [0–1]	BOD efficiency tertiary treatment	0.92–0.98	0.96
Eff.SD	BOD efficiency septic tank	0.35–0.40	0.40
#DD [days]	Retention days in excess of basin travel time employed by disconnected domestic waste to reach stream network	4–8	7
#LVST [days]	Retention days in excess of basin travel time employed by low density livestock waste to reach stream network	4–8	7
k20 [days−1]	Freshwater BOD retention	0.35–0.60	0.56
EMCU [mg O2 L−1]	Effective mean concentration of BOD in combined sewer overflows in urban areas	1–21	11
ENAT [t km−2 y−1]	BOD export coefficient of natural areas	0–0.5	0.16
bod/toc	Ratio BOD/TOC in industrial waste	0.2–2.2	0.75