Table 4.
Standard score criteria for structural evaluation of constructed wetland

Category	Weighted score	Factors of appraisal	Actors of appraisal	Standard score criteria		Weighted score
Physical structure	62.5	Suitability of location	Areas higher than the dam’s water level1) (frequency of flooding)	once/10year	100	20.2
				once/year	80	16.2
				2 or more times/year	60	12.1
		Water supply system	Adequacy of weir, inlet and outlet	Good	100	14.6
				Average	80	11.7
				Poor	60	8.8
		Depth of water	Area ratio of shallow wetlands(0.0~0.3 m) *50% or more2)	50∼60%	100	7.8
				30∼50%	80	6.2
				⟨ 30%, ⟩ 60%	60	4.7
		Ratio of length to width	At least 2:13)	2:1 or more	100	8.9
				1.5:1∼1.9:1	80	7.1
				Less than 1.5:1	60	5.3
		Slope of flow channel	0.5∼1.0%4)	0.5∼1.0%	100	10.9
				1.0∼1.5%	80	8.7
				⟨ 0.5%, ⟩ 1.5%	60	6.5
Vegetation structure	37.5	Number of planted flora	5~7 species5)	≧ 7	100	8.9
				5 ~ 6	80	7.1
				≦ 4	60	5.3
		Vegetation coverage	At least 50% of the wetland surface area6)	50∼60%	100	14.1
				40∼50%	80	11.3
				⟨ 40%, ⟩ 60%	60	8.5
		Ecological health	Emergence of endangered species and migrant species	Good	100	14.6
				Average	80	11.7
				Poor	60	8.8