CUMCM-2005 Problem A:

Water Quality Evaluation and Prediction of the Yangtze River

Water is essential for life. So, protecting the water resource is just protecting our lives. Great importance should be attached to the water resource protection and management of our lakes and rivers. Scientists appealed to promote people-centered development, build up civilized and harmonious society, improve human and natural environment and reduce pollution.

The Yangtze River is the longest one in China,andthe third longest onein the world. Its water pollution is being ever severe, to which related government departments and scientists’ have paid much attention. In October 2004, composed of National Committee of the Chinese People’s Political Consultative Conference and China Development Research Institution, an investigation group surveyed 21 key cities along the Yangtze River form Yibin to Shanghai. They depicted a real picture of water pollution situation of the Yangtze River, which is shock by the sight. Therefore, experts put forward that if no measure was taken to save the Yangtze ecosystem in time, it would be close to damage by 10 years and they also yelled what we could do to save it.

Testing data on several main water quality parametersover last two years from 17 observing stations along the Yangtze River as well as basic data(including distances between stations, water flow and water current velocity) from 7 stations located at the river’s mainstream are presented in Appendix A. The water pollution tested by the observing stations is usually considered mainly from vicinal rejection and upriver sewage. Generally speaking, the river itself has some degree of natural purifying ability, that is, the pollutant concentrationcan be reduced by physical degradation, chemical degradation and biodegradation in the water environment. Index reflects such natural purifying ability are called degradation coefficient.In fact, thepurifying ability of the Yangtze’s mainstream can be thought as being approximately uniform.Besides, according to the survey data, it is known that the degradation coefficient of main pollution parameterssuch aspermanganate indexand ammonia nitrogenare usually between 0.1 and 0.5, e.g., 0.2 (unit：1/day) is acceptable. Statistics in Appendix B is cited from the report on the water quality of the Yangtze River from 1995 to 2004. The table just below in the Attached Tablestandard value of four main parameters,which is cited from Environmental Quality Standard for Surface Water (GB3838-2002).

Please work on following problems:

(a) Give integrated quantitative evaluation of the Yangtze’s water quality in last two years, and analyze the water pollution situation monitored by each observing station.

(b) Analyze which river section are the roots of CODMn and NH3-N pollutant respectively in the lately year.

(c) If no effective measures are taken, according to the statistics over the last 10 years, prediction the development trend of future pollution in the Yangtze River.

(d) If the proportion of class IV and V water of the mainstream of the Yangtze River is limited within 20% in the following 10 years and there is no worsen than V water too, then how much wastewater should be dealt with every year?

(e) What feasible suggestions you have on the water pollution of the Yangtze River?

Attached Table: Following table lists standard value of four main parameters cited from Environmental Quality Standards for Surface Water (GB3838-2002) unit：mg/L


No. / water quality class
standard
parameters value / Class Ⅰ / Class Ⅱ / Class Ⅲ / Class Ⅳ / Class Ⅴ / Worse than class V
1 / dissolved oxygen
(DO) ≥ / 7.5
(or percentage of saturation is 90%) / 6 / 5 / 3 / 2 / 0
2 / permanganate index (CODMn) ≤ / 2 / 4 / 6 / 10 / 15 / ∞
3 / ammonianitrogen
( NH3-N) ≤ / 0.15 / 0.5 / 1.0 / 1.5 / 2.0 / ∞
4 / PH*(no dimension) / 6---9

Appendix A:

1. Report on the water quality of key cities along the Yangtze River valley

Publishing data: June, 2003

No. / Observing station / Section condition / Monitoring parameters (mg/L) / Water quality class / Main pollution indicators
pH* / DO / CODMn / NH3-N / This
month / Last
month
1 / Panzhihua, SichuanProvince / mainstream / 7.6 / 6.8 / 0.2 / 0.1 / II / Ⅱ
2 / Zhutuo, Chongqing / mainstream(Sichuan-Chongqing province border) / 7.63 / 8.41 / 2.8 / 0.34 / II / Ⅱ
3 / Nanjinguan, Yichang, Hubei Province / mainstream（exit of the Three Gorges reservoir） / 7.07 / 7.81 / 5.8 / 0.55 / III / Ⅲ
4 / Chenglingji, Yueyang, Hunan Province / mainstream / 7.58 / 6.47 / 2.9 / 0.34 / II / Ⅱ
5 / Hexi water plant, Jiujiang, Jiangxi Province / mainstream (Huber-Jiangxi province border) / 7.34 / 6.19 / 1.7 / 0.13 / II / Ⅱ
6 / Wanhekou, Anqing, Anhui Province / mainstream / 7.52 / 6.54 / 3.2 / 0.22 / II / Ⅱ
7 / Linshan, Nanjing, Jiangsu Province / Mainstream (Anhui-Jiangsu province border） / 7.78 / 6.9 / 3.1 / 0.11 / II / Ⅱ
8 / MinRiver bridge, Leshan, Sichuan Province / MinRiver (before joins the DaduRiver) / 7.66 / 4.2 / 5.8 / 0.53 / IV / Ⅳ / DO
9 / Liangjianggou, Yibin, Sichuan Province / MinRiver (before flow into the Yangtze River) / 8.01 / 7.63 / 2.4 / 0.25 / II / Ⅱ
10 / the 2nd TuoRiver bridge, Luzhou, Sichuan Province / TuoRiver (before flow into the Yangtze River) / 7.63 / 4.02 / 3.6 / 1.06 / IV / Ⅳ / DO、NH3-N
11 / Hujialing, Danjiangkou, Hubei Province / Danjiangkou reservoir / 8.63 / 10.2 / 1.8 / 0.1 / I / Ⅰ
12 / Xingang, Changsha, Hunan Province / XiangRiver (The Dongting LakeMouth) / 7.42 / 6.45 / 4.3 / 0.99 / III / Ⅲ
13 / Yueyang towel, Yueyang, Hunan Province / The Dongting LakeExit / 7.73 / 6.26 / 1.4 / 0.21 / II / Ⅲ
14 / Zongguan, Wuhan, Hubei Province / Han River(before flow into the Yangtze River / 8 / 6.43 / 2.4 / 0.17 / II / Ⅱ
15 / Chucha, Nanchang, Jiangxi Province / Gan River (The Poyang Lake Mouth） / 6.64 / 5.18 / 1.1 / 0.92 / III / Ⅲ
16 / Hamashi, Jiujiang, Jiangxi / The PoyangLakeExit / 7.28 / 6.87 / 2.7 / 0.15 / II / Ⅱ
17 / Sanjiangying, Yangzhou, Jiangsu Province / JiaRiver (Water Intake of the South-to-North Water Transfer) / 7.29 / 6.9 / 1.6 / 0.15 / II / Ⅱ

Publishing data: July, 2003

No. / Observing station / Section condition / Monitoring parameters (mg/L) / Water quality class / Main pollution indicators
pH* / DO / CODMn / NH3-N / This
month / Last
month
18 / Panzhihua, SichuanProvince / mainstream / 8.3 / 8.1 / 5.6 / 0.1 / III / II
19 / Zhutuo, Chongqing / mainstream(Sichuan-Chongqing province border) / 7.47 / 8.54 / 1.6 / 0.25 / II / II
20 / Nanjinguan, Yichang, Hubei Province / mainstream（exit of the Three Gorges reservoir） / 7.73 / 7.89 / 5.2 / 0.22 / III / III
21 / Chenglingji, Yueyang, Hunan Province / mainstream / 7.78 / 7.57 / 3.9 / 0.31 / II / II
22 / Hexi water plant, Jiujiang, Jiangxi Province / mainstream (Huber-Jiangxi province border) / 7.06 / 6.25 / 2.3 / 0.18 / II / II
23 / Wanhekou, Anqing, Anhui Province / mainstream / 7.63 / 6.73 / 3 / 0.28 / II / II
24 / Linshan, Nanjing, Jiangsu Province / Mainstream (Anhui-Jiangsu province border） / 7.41 / 6.37 / 2.5 / 0.1 / II / II
25 / MinRiver bridge, Leshan, Sichuan Province / MinRiver (before joins the DaduRiver) / 7.61 / 4.63 / 4.5 / 0.92 / IV / IV / DO
26 / Liangjianggou, Yibin, Sichuan Province / MinRiver (before flow into the Yangtze River) / 8.09 / 8.08 / 8 / 0.37 / IV / II / CODMn
27 / the 2nd TuoRiver bridge, Luzhou, Sichuan Province / TuoRiver (before flow into the Yangtze River) / 7.9 / 4.7 / 6.4 / 0.37 / IV / IV / CODMn, DO
28 / Hujialing, Danjiangkou, Hubei Province / Danjiangkou reservoir / 8.17 / 9.81 / 1.9 / 0.09 / I / I
28 / Xingang, Changsha, Hunan Province / XiangRiver (The Dongting LakeMouth) / 7.64 / 6.93 / 2.6 / 0.4 / II / III
30 / Yueyang towel, Yueyang, Hunan Province / The Dongting LakeExit / 7.86 / 6.49 / 3.3 / 0.26 / II / II
31 / Zongguan, Wuhan, Hubei Province / Han River(before flow into the Yangtze River / 8 / 5.38 / 3.7 / 0.14 / III / II
32 / Chucha, Nanchang, Jiangxi Province / Gan River (The Poyang Lake Mouth） / 6.71 / 4.85 / 1 / 1.01 / IV / III / DO
33 / Hamashi, Jiujiang, Jiangxi / The Poyang Lake Exit / 7.68 / 6.08 / 2.6 / 0.19 / II / II
34 / Sanjiangying, Yangzhou, Jiangsu Province / Jia River (Water Intake of the South-to-North Water Transfer) / 7.31 / 4.49 / 1.6 / 0.32 / IV / II / DO

Publishing data: August, 2003

No. / Observing station / Section condition / Monitoring parameters (mg/L) / Water quality class / Main pollution indicators
pH* / DO / CODMn / NH3-N / This
month / Last
month
35 / Panzhihua, Sichuan Province / mainstream / 8.24 / 8.1 / 0.5 / 0.15 / I / III
36 / Zhutuo, Chongqing / mainstream(Sichuan-Chongqing province border) / 7.73 / 8.55 / 1.8 / 0.2 / II / II
37 / Nanjinguan, Yichang, Hubei Province / mainstream（exit of the Three Gorges reservoir） / 7.8 / 6.65 / 2.8 / 0.31 / II / III
38 / Chenglingji, Yueyang, Hunan Province / mainstream / 7.89 / 7.92 / 2.6 / 0.32 / II / II
39 / Hexi water plant, Jiujiang, Jiangxi Province / mainstream (Huber-Jiangxi province border) / 8.57 / 6.88 / 3 / 0.08 / II / II
40 / Wanhekou, Anqing, Anhui Province / mainstream / 7.61 / 7.07 / 2 / 0.32 / II / II
41 / Linshan, Nanjing, Jiangsu Province / Mainstream (Anhui-Jiangsu province border） / 7.59 / 6.47 / 2 / 0.12 / II / II
42 / Min River bridge, Leshan, Sichuan Province / Min River (before joins the Dadu River) / 7.57 / 5.49 / 4.7 / 1.93 / V / IV / NH3-N
43 / Liangjianggou, Yibin, Sichuan Province / Min River (before flow into the Yangtze River) / 7.77 / 8.67 / 4 / 0.34 / II / IV
44 / the 2nd Tuo River bridge, Luzhou, Sichuan Province / Tuo River (before flow into the Yangtze River) / 7.19 / 7.16 / 2.4 / 0.39 / II / IV
45 / Hujialing, Danjiangkou, Hubei Province / Danjiangkou reservoir / 7.72 / 9.03 / 2.5 / 0.07 / II / I
46 / Xingang, Changsha, Hunan Province / Xiang River (The Dongting Lake Mouth) / 6.29 / 4.34 / 2.9 / 0.92 / IV / II / DO
47 / Yueyang towel, Yueyang, Hunan Province / The Dongting Lake Exit / 7.25 / 8.32 / 3.7 / 0.37 / II / II
48 / Zongguan, Wuhan, Hubei Province / Han River(before flow into the Yangtze River / 7.91 / 5.87 / 3.6 / 0.25 / III / III
49 / Chucha, Nanchang, Jiangxi Province / Gan River (The Poyang Lake Mouth） / 6.78 / 5.35 / 1.7 / 2.18 / Worse than V / IV / NH3-N
50 / Hamashi, Jiujiang, Jiangxi / The Poyang Lake Exit / 6.7 / 6.67 / 3.5 / 0.16 / II / II
51 / Sanjiangying, Yangzhou, Jiangsu Province / Jia River (Water Intake of the South-to-North Water Transfer) / 7.09 / 6.02 / 3.8 / 0.19 / II / IV

Publishing data: September, 2003

No. / Observing station / Section condition / Monitoring parameters (mg/L) / Water quality class / Main pollution indicators
pH* / DO / CODMn / NH3-N / This
month / Last
month
52 / Panzhihua, Sichuan Province / mainstream / 8.34 / 8.8 / 1.1 / 0.11 / I / I
53 / Zhutuo, Chongqing / mainstream(Sichuan-Chongqing province border) / 7.63 / 8.58 / 1.5 / 0.24 / II / II
54 / Nanjinguan, Yichang, Hubei Province / mainstream（exit of the Three Gorges reservoir） / 7.55 / 10.6 / 3.6 / 0.36 / II / II
55 / Chenglingji, Yueyang, Hunan Province / mainstream / 7.93 / 8.36 / 3.1 / 0.3 / II / III
56 / Hexi water plant, Jiujiang, Jiangxi Province / mainstream (Huber-Jiangxi province border) / 7.6 / 7.43 / 2.3 / 0.14 / II / II
57 / Wanhekou, Anqing, Anhui Province / mainstream / 7.67 / 6.9 / 5 / 0.39 / III / II
58 / Linshan, Nanjing, Jiangsu Province / Mainstream (Anhui-Jiangsu province border） / 7.83 / 6.61 / 1.5 / 0.04 / II / II
59 / Min River bridge, Leshan, Sichuan Province / Min River (before joins the Dadu River) / 8.02 / 6.32 / 3.6 / 1.41 / IV / IV / NH3-N
60 / Liangjianggou, Yibin, Sichuan Province / Min River (before flow into the Yangtze River) / 7.96 / 9.12 / 2.6 / 0.27 / II / II
61 / the 2nd Tuo River bridge, Luzhou, Sichuan Province / Tuo River (before flow into the Yangtze River) / 7.44 / 7.73 / 3.4 / 0.53 / III / III
62 / Hujialing, Danjiangkou, Hubei Province / Danjiangkou reservoir / 7.52 / 7.11 / 2.2 / 0.12 / II / II
63 / Xingang, Changsha, Hunan Province / Xiang River (The Dongting Lake Mouth) / 7.6 / 6.7 / 2.5 / 0.75 / III / III
64 / Yueyang towel, Yueyang, Hunan Province / The Dongting Lake Exit / 6.97 / 8.8 / 3.5 / 0.31 / II / II
65 / Zongguan, Wuhan, Hubei Province / Han River(before flow into the Yangtze River / 7.95 / 6.32 / 2.5 / 0.35 / II / III
66 / Chucha, Nanchang, Jiangxi Province / Gan River (The Poyang Lake Mouth） / 6.78 / 4.04 / 0.77 / 3.06 / Worse than V / Worse
than V / NH3-N
67 / Hamashi, Jiujiang, Jiangxi / The Poyang Lake Exit / 6.97 / 7.14 / 2.8 / 0.26 / II / II
68 / Sanjiangying, Yangzhou, Jiangsu Province / Jia River (Water Intake of the South-to-North Water Transfer) / 8.03 / 5.76 / 1.1 / 0.41 / III / II

Publishing data: October, 2003

No. / Observing station / Section condition / Monitoring parameters (mg/L) / Water quality class / Main pollution indicators
pH* / DO / CODMn / NH3-N / This
month / Last
month
69 / Panzhihua, Sichuan Province / mainstream / 8.37 / 8.6 / 3.1 / 0.17 / Ⅱ / I
70 / Zhutuo, Chongqing / mainstream(Sichuan-Chongqing province border) / 7.72 / 9.02 / 2.1 / 0.28 / Ⅱ / II
71 / Nanjinguan, Yichang, Hubei Province / mainstream（exit of the Three Gorges reservoir） / 7.22 / 11.9 / 2.4 / 0.26 / Ⅱ / II
72 / Chenglingji, Yueyang, Hunan Province / mainstream / 7.91 / 8.01 / 6 / 0.27 / Ⅲ / II
73 / Hexi water plant, Jiujiang, Jiangxi Province / mainstream (Huber-Jiangxi province border) / 7.41 / 7.66 / 3.3 / 0.13 / Ⅱ / II
74 / Wanhekou, Anqing, Anhui Province / mainstream / 7.75 / 7.65 / 2.9 / 0.28 / Ⅱ / III
75 / Linshan, Nanjing, Jiangsu Province / Mainstream (Anhui-Jiangsu province border） / 7.73 / 6.89 / 1.9 / 0.16 / Ⅱ / II
76 / Min River bridge, Leshan, Sichuan Province / Min River (before joins the Dadu River) / 7.97 / 5.82 / 5.7 / 0.76 / Ⅲ / IV
77 / Liangjianggou, Yibin, Sichuan Province / Min River (before flow into the Yangtze River) / 7.99 / 10.1 / 2.6 / 0.32 / Ⅱ / II
78 / the 2nd Tuo River bridge, Luzhou, Sichuan Province / Tuo River (before flow into the Yangtze River) / 7.53 / 7.07 / 6 / 0.46 / Ⅲ / III
79 / Hujialing, Danjiangkou, Hubei Province / Danjiangkou reservoir / 7.54 / 8.42 / 2.1 / 0.12 / Ⅱ / II
80 / Xingang, Changsha, Hunan Province / Xiang River (The Dongting Lake Mouth) / 7.62 / 5.44 / 2.2 / 1.12 / Ⅳ / III / NH3-N
81 / Yueyang towel, Yueyang, Hunan Province / The Dongting Lake Exit / 7.54 / 9.97 / 2.8 / 0.24 / Ⅱ / II
82 / Zongguan, Wuhan, Hubei Province / Han River(before flow into the Yangtze River / 7.94 / 7.42 / 2.6 / 0.44 / Ⅱ / II
83 / Chucha, Nanchang, Jiangxi Province / Gan River (The Poyang Lake Mouth） / 7.03 / 6.2 / 1.8 / 6.5 / Worse than V / Worse
than V / NH3-N
84 / Hamashi, Jiujiang, Jiangxi / The Poyang Lake Exit / 7 / 8.76 / 3.4 / 0.26 / Ⅱ / II
85 / Sanjiangying, Yangzhou, Jiangsu Province / Jia River (Water Intake of the South-to-North Water Transfer) / 7.83 / 8 / 2.9 / 0.41 / Ⅱ / III

Publishing data: Nevember, 2003

No. / Observing station / Section condition / Monitoring parameters (mg/L) / Water quality class / Main pollution indicators
pH* / DO / CODMn / NH3-N / This
month / Last
month
86 / Panzhihua, Sichuan Province / mainstream / 8.57 / 9.1 / 1.5 / 0.06 / Ⅰ / Ⅱ
87 / Zhutuo, Chongqing / mainstream(Sichuan-Chongqing province border) / 7.71 / 9.53 / 1.2 / 0.47 / Ⅱ / Ⅱ
88 / Nanjinguan, Yichang, Hubei Province / mainstream（exit of the Three Gorges reservoir） / 7.46 / 9 / 3.2 / 0.22 / Ⅱ / Ⅱ
89 / Chenglingji, Yueyang, Hunan Province / mainstream / 8 / 8.59 / 3.1 / 0.39 / Ⅱ / Ⅲ
90 / Hexi water plant, Jiujiang, Jiangxi Province / mainstream (Huber-Jiangxi province border) / 7.32 / 8.64 / 2.6 / 0.2 / Ⅱ / Ⅱ
91 / Wanhekou, Anqing, Anhui Province / mainstream / 7.74 / 7.85 / 2.4 / 0.22 / Ⅱ / Ⅱ
92 / Linshan, Nanjing, Jiangsu Province / Mainstream (Anhui-Jiangsu province border） / 7.89 / 8.41 / 2.4 / 0.28 / Ⅱ / Ⅱ
93 / Min River bridge, Leshan, Sichuan Province / Min River (before joins the Dadu River) / 8.15 / 4.84 / 8.6 / 0.87 / Ⅳ / Ⅲ / DO, CODMn
94 / Liangjianggou, Yibin, Sichuan Province / Min River (before flow into the Yangtze River) / 7.77 / 10.3 / 2.9 / 0.85 / Ⅲ / Ⅱ
95 / the 2nd TuoRiver bridge, Luzhou, Sichuan Province / TuoRiver (before flow into the Yangtze River) / 7.34 / 6.31 / 1.3 / 0.59 / Ⅲ / Ⅲ
96 / Hujialing, Danjiangkou, Hubei Province / Danjiangkou reservoir / 7.3 / 8.74 / 2.3 / 0.1 / Ⅱ / Ⅱ
97 / Xingang, Changsha, Hunan Province / XiangRiver (The Dongting LakeMouth) / 7.62 / 7.37 / 1.8 / 1.48 / Ⅳ / Ⅳ / NH3-N
98 / Yueyang towel, Yueyang, Hunan Province / The DongtingLakeExit / 7.18 / 8.13 / 3.6 / 0.48 / Ⅱ / Ⅱ
99 / Zongguan, Wuhan, Hubei Province / Han River(before flow into the Yangtze River / 7.91 / 8.61 / 4.7 / 0.24 / Ⅲ / Ⅱ
100 / Chucha, Nanchang, Jiangxi Province / Gan River (The Poyang Lake Mouth） / 7.57 / 9.23 / 3 / 12.9 / Worse than V / Worse
than V / NH3-N
101 / Hamashi, Jiujiang, Jiangxi / The Poyang Lake Exit / 8.1 / 8.92 / 5.5 / 0.52 / Ⅲ / Ⅱ
102 / Sanjiangying, Yangzhou, Jiangsu Province / Jia River (Water Intake of the South-to-North Water Transfer) / 7.93 / 9.77 / 1.8 / 0.38 / Ⅱ / Ⅱ

Publishing data: December, 2003

No. / Observing station / Section condition / Monitoring parameters (mg/L) / Water quality class / Main pollution indicators
pH* / DO / CODMn / NH3-N / This
month / Last
month
103 / Panzhihua, Sichuan Province / mainstream / 8.43 / 9.39 / 2.5 / 0.07 / Ⅱ / Ⅰ
104 / Zhutuo, Chongqing / mainstream(Sichuan-Chongqing province border) / 7.79 / 10.4 / 1.1 / 0.42 / Ⅱ / Ⅱ
105 / Nanjinguan, Yichang, Hubei Province / mainstream（exit of the Three Gorges reservoir） / 7.96 / 9.63 / 1.8 / 0.2 / Ⅱ / Ⅱ
106 / Chenglingji, Yueyang, Hunan Province / mainstream / 7.88 / 8.34 / 5 / 0.32 / Ⅲ / Ⅱ
107 / Hexi water plant, Jiujiang, Jiangxi Province / mainstream (Huber-Jiangxi province border) / 7.18 / 8.6 / 2.4 / 0.19 / Ⅱ / Ⅱ
108 / Wanhekou, Anqing, Anhui Province / mainstream / 7.7 / 8.67 / 2.6 / 0.33 / Ⅱ / Ⅱ
109 / Linshan, Nanjing, Jiangsu Province / Mainstream (Anhui-Jiangsu province border） / 7.9 / 8.95 / 2.7 / 0.26 / Ⅱ / Ⅱ
110 / Min River bridge, Leshan, Sichuan Province / Min River (before joins the Dadu River) / 7.93 / 6.41 / 8.7 / 1.33 / Ⅳ / Ⅳ / CODMn,
NH3-N
111 / Liangjianggou, Yibin, Sichuan Province / Min River (before flow into the Yangtze River) / 7.46 / 10.6 / 3.2 / 1.66 / Ⅴ / Ⅲ / NH3-N
112 / the 2nd Tuo River bridge, Luzhou, Sichuan Province / Tuo River (before flow into the Yangtze River) / 7.3 / 3.8 / 3.4 / 1.37 / Ⅳ / Ⅲ / DO, NH3-N
113 / Hujialing, Danjiangkou, Hubei Province / Danjiangkou reservoir / 6.91 / 10.2 / 2.1 / 0.13 / Ⅱ / Ⅱ
114 / Xingang, Changsha, Hunan Province / Xiang River (The Dongting Lake Mouth) / 7.09 / 7.15 / 1.8 / 1.39 / Ⅳ / Ⅳ / NH3-N
115 / Yueyang towel, Yueyang, Hunan Province / The Dongting Lake Exit / 6.79 / 8.35 / 4.3 / 0.29 / Ⅲ / Ⅱ
116 / Zongguan, Wuhan, Hubei Province / Han River(before flow into the Yangtze River / 7.92 / 9.87 / 3.2 / 0.23 / Ⅱ / Ⅲ
117 / Chucha, Nanchang, Jiangxi Province / Gan River (The Poyang Lake Mouth） / 7.58 / 7.77 / 2.6 / 14 / Worse than V / Worse
than V / NH3-N
118 / Hamashi, Jiujiang, Jiangxi / The Poyang Lake Exit / 7.8 / 10.1 / 5.3 / 0.67 / Ⅲ / Ⅲ
119 / Sanjiangying, Yangzhou, Jiangsu Province / Jia River (Water Intake of the South-to-North Water Transfer) / 8.03 / 11.2 / 2 / 0.36 / Ⅱ / Ⅱ

Publishing data: January, 2004

No. / Observing station / Section condition / Monitoring parameters (mg/L) / Water quality class / Main pollution indicators
pH* / DO / CODMn / NH3-N / This
month / Last
month
120 / Panzhihua, Sichuan Province / mainstream / 8.21 / 9.47 / 2 / 0.42 / Ⅱ / Ⅱ
121 / Zhutuo, Chongqing / mainstream(Sichuan-Chongqing province border) / 7.74 / 10.2 / 1.2 / 0.49 / Ⅱ / Ⅱ
122 / Nanjinguan, Yichang, Hubei Province / mainstream（exit of the Three Gorges reservoir） / 7.91 / 8.17 / 1.9 / 0.33 / Ⅱ / Ⅱ
123 / Chenglingji, Yueyang, Hunan Province / mainstream / 7.68 / 8.24 / 4.2 / 0.36 / Ⅲ / Ⅲ
124 / Hexi water plant, Jiujiang, Jiangxi Province / mainstream (Huber-Jiangxi province border) / 7.64 / 8.38 / 2.2 / 0.24 / Ⅱ / Ⅱ
125 / Wanhekou, Anqing, Anhui Province / mainstream / 7.74 / 8.62 / 3 / 0.32 / Ⅱ / Ⅱ
126 / Linshan, Nanjing, Jiangsu Province / Mainstream (Anhui-Jiangsu province border） / 7.84 / 8.8 / 1.2 / 0.27 / Ⅱ / Ⅱ
127 / Min River bridge, Leshan, Sichuan Province / Min River (before joins the Dadu River) / 7.71 / 6.61 / 9.4 / 1.85 / Ⅴ / Ⅳ / NH3-N
128 / Liangjianggou, Yibin, Sichuan Province / Min River (before flow into the Yangtze River) / 7.28 / 8.05 / 3.5 / 1.6 / Ⅴ / Ⅴ / NH3-N
129 / the 2nd Tuo River bridge, Luzhou, Sichuan Province / Tuo River (before flow into the Yangtze River) / 7.22 / 2.79 / 6.2 / 0.97 / Ⅴ / Ⅳ / DO
130 / Hujialing, Danjiangkou, Hubei Province / Danjiangkou reservoir / 7.29 / 8.91 / 2.1 / 0.09 / Ⅱ / Ⅱ
131 / Xingang, Changsha, Hunan Province / Xiang River (The Dongting Lake Mouth) / 7 / 6.73 / 2 / 1.24 / Ⅳ / Ⅳ / NH3-N
132 / Yueyang towel, Yueyang, Hunan Province / The Dongting Lake Exit / 6.77 / 7.13 / 2.7 / 0.34 / Ⅱ / Ⅲ
133 / Zongguan, Wuhan, Hubei Province / Han River(before flow into the Yangtze River / 7.96 / 9.9 / 3.6 / 0.29 / Ⅱ / Ⅱ
134 / Chucha, Nanchang, Jiangxi Province / Gan River (The Poyang Lake Mouth） / 7.34 / 7.17 / 3.1 / 14.5 / Worse than V / Worse
than V / NH3-N
135 / Hamashi, Jiujiang, Jiangxi / The Poyang Lake Exit / 8.01 / 9.41 / 5.2 / 0.5 / Ⅲ / Ⅲ
136 / Sanjiangying, Yangzhou, Jiangsu Province / Jia River (Water Intake of the South-to-North Water Transfer) / 7.81 / 11.4 / 1.2 / 0.29 / Ⅱ / Ⅱ

Publishing data: February, 2004

No. / Observing station / Section condition / Monitoring parameters (mg/L) / Water quality class / Main pollution indicators
pH* / DO / CODMn / NH3-N / This
month / Last
month
137 / Panzhihua, Sichuan Province / mainstream / 8.37 / 9.49 / 0.4 / 1.22 / Ⅳ / Ⅱ / NH3-N
138 / Zhutuo, Chongqing / mainstream(Sichuan-Chongqing province border) / 7.77 / 9.08 / 1.2 / 0.6 / Ⅲ / Ⅱ
139 / Nanjinguan, Yichang, Hubei Province / mainstream（exit of the Three Gorges reservoir） / 7.71 / 8.38 / 3.5 / 0.25 / Ⅱ / Ⅱ
140 / Chenglingji, Yueyang, Hunan Province / mainstream / 7.77 / 8.05 / 4.1 / 0.32 / Ⅲ / Ⅲ
141 / Hexi water plant, Jiujiang, Jiangxi Province / mainstream (Huber-Jiangxi province border) / 6.89 / 7.07 / 2.4 / 0.22 / Ⅱ / Ⅱ
142 / Wanhekou, Anqing, Anhui Province / mainstream / 7.72 / 8.74 / 1.9 / 0.32 / Ⅱ / Ⅱ
143 / Linshan, Nanjing, Jiangsu Province / Mainstream (Anhui-Jiangsu province border） / 7.71 / 10 / 1.8 / 0.29 / Ⅱ / Ⅱ
144 / Min River bridge, Leshan, Sichuan Province / Min River (before joins the Dadu River) / 7.84 / 4.86 / 9.5 / 1.93 / Ⅴ / Ⅴ / NH3-N
145 / Liangjianggou, Yibin, Sichuan Province / Min River (before flow into the Yangtze River) / 6.73 / 14.1 / 2.5 / 0.96 / Ⅲ / Ⅴ
146 / the 2nd Tuo River bridge, Luzhou, Sichuan Province / Tuo River (before flow into the Yangtze River) / 7.35 / 6.43 / 5.5 / 2.1 / Worse than V / Ⅴ / NH3-N
147 / Hujialing, Danjiangkou, Hubei Province / Danjiangkou reservoir / 7.28 / 8.1 / 1.8 / 0.11 / Ⅰ / Ⅱ
148 / Xingang, Changsha, Hunan Province / Xiang River (The Dongting Lake Mouth) / 6.73 / 5.49 / 1.8 / 1.21 / Ⅳ / Ⅳ / NH3-N
149 / Yueyang towel, Yueyang, Hunan Province / The Dongting Lake Exit / 7.35 / 7.65 / 4 / 0.33 / Ⅱ / Ⅱ
150 / Zongguan, Wuhan, Hubei Province / Han River(before flow into the Yangtze River / 7.92 / 8.35 / 3.6 / 0.3 / Ⅱ / Ⅱ
151 / Chucha, Nanchang, Jiangxi Province / Gan River (The Poyang Lake Mouth） / 7.72 / 0.88 / 9 / 24.2 / Worse than V / Worse
than V / DO, NH3-N
152 / Hamashi, Jiujiang, Jiangxi / The Poyang Lake Exit / 7.9 / 8.9 / 6.8 / 0.59 / Ⅳ / Ⅲ / CODMn
153 / Sanjiangying, Yangzhou, Jiangsu Province / Jia River (Water Intake of the South-to-North Water Transfer) / 7.96 / 9.76 / 2.4 / 0.24 / Ⅱ / Ⅱ

Publishing data: March, 2004

No. / Observing station / Section condition / Monitoring parameters (mg/L) / Water quality class / Main pollution indicators
pH* / DO / CODMn / NH3-N / This
month / Last
month
154 / Panzhihua, Sichuan Province / mainstream / 8.38 / 8.97 / 2.3 / 0.13 / Ⅱ / Ⅳ
155 / Zhutuo, Chongqing / mainstream(Sichuan-Chongqing province border) / 7.64 / 8.48 / 2.4 / 0.42 / Ⅱ / Ⅲ
156 / Nanjinguan, Yichang, Hubei Province / mainstream（exit of the Three Gorges reservoir） / 7.34 / 11.6 / 3.6 / 0.43 / Ⅱ / Ⅱ
157 / Chenglingji, Yueyang, Hunan Province / mainstream / 7.57 / 8.54 / 3.8 / 0.25 / Ⅱ / Ⅲ
158 / Hexi water plant, Jiujiang, Jiangxi Province / mainstream (Huber-Jiangxi province border) / 7.16 / 8.62 / 2.2 / 0.22 / Ⅱ / Ⅱ
159 / Wanhekou, Anqing, Anhui Province / mainstream / 7.4 / 7.19 / 2.9 / 0.18 / Ⅱ / Ⅱ
160 / Linshan, Nanjing, Jiangsu Province / Mainstream (Anhui-Jiangsu province border） / 7.82 / 8.55 / 1.2 / 0.28 / Ⅱ / Ⅱ
161 / Min River bridge, Leshan, Sichuan Province / Min River (before joins the Dadu River) / 6.88 / 3.35 / 9.9 / 1.87 / Ⅴ / Ⅴ / NH3-N
162 / Liangjianggou, Yibin, Sichuan Province / Min River (before flow into the Yangtze River) / 8.07 / 14.4 / 2.6 / 2 / Ⅴ / Ⅲ / NH3-N
163 / the 2nd Tuo River bridge, Luzhou, Sichuan Province / Tuo River (before flow into the Yangtze River) / 7.08 / 4.37 / 3.8 / 5.5 / Worse than V / Worse
than V / NH3-N
164 / Hujialing, Danjiangkou, Hubei Province / Danjiangkou reservoir / 7.72 / 9.17 / 1.9 / 0.13 / Ⅰ / Ⅰ
165 / Xingang, Changsha, Hunan Province / Xiang River (The Dongting Lake Mouth) / 7.46 / 5.16 / 2.5 / 1.2 / Ⅳ / Ⅳ / NH3-N
166 / Yueyang towel, Yueyang, Hunan Province / The Dongting Lake Exit / 7.28 / 5.4 / 4.4 / 0.33 / Ⅲ / Ⅱ
167 / Zongguan, Wuhan, Hubei Province / Han River(before flow into the Yangtze River / 7.95 / 8.59 / 2.9 / 0.25 / Ⅱ / Ⅱ
168 / Chucha, Nanchang, Jiangxi Province / Gan River (The Poyang Lake Mouth） / 6.22 / 5.83 / 1.5 / 2.09 / Worse than V / Worse
than V / NH3-N
169 / Hamashi, Jiujiang, Jiangxi / The Poyang Lake Exit / 7.87 / 8.79 / 4.8 / 0.55 / Ⅲ / Ⅳ
170 / Sanjiangying, Yangzhou, Jiangsu Province / Jia River (Water Intake of the South-to-North Water Transfer) / 7.72 / 9.13 / 1.9 / 0.2 / Ⅱ / Ⅱ

Publishing data: April, 2004