Table 1. Impermeable index by Jungrangcheon watershed

Watershed		Area(m2)	Conversion area(m2)	Urbanization index	Priority
Jungrang Cheon Stream	1	5,484,821	2,344,903	0.43	7
	2	4,281,807	1,019,616	0.24	14
	3	4,060,263	1,824,444	0.45	6
	4	2,567,248	521,888	0.20	17
	5	4,216,688	866,034	0.21	16
	6	1,122,063	143,641	0.13	24
	7	3,311,945	436,948	0.13	25
	8	2,474,912	187,955	0.08	27
	9	4,415,335	732,454	0.17	19
	10	3,708,743	1,812,183	0.49	5
	11	3,103,306	821,731	0.26	13
	12	4,082,394	507,774	0.12	26
	13	5,833,921	1,255,203	0.22	15
	14	2,870,166	558,146	0.19	18
	15	6,911,134	1,045,017	0.15	20
	16	8,039,576	2,923,332	0.36	10
	17	2,310,112	672,913	0.29	12
	18	1,339,632	476,958	0.36	11
	19	937,840	559,776	0.60	3
	20	2,073,976	1,032,917	0.50	4
	21	5,650,731	2,103,211	0.37	8
	22	2,537,623	365,547	0.14	22
	23	3,485,657	523,133	0.15	21
	24	2,102,811	286,095	0.14	23
	25	6,745,192	2,519,266	0.37	9
	26	2,244,089	1,587,572	0.71	2
	27	2,267,360	1,967,998	0.87	1
Total		98,179,343	29,096,653	-	-