(1) The current water quality of Taichung rivers (17 stations) has been generally stable over the years, and is affected by geology (manganese is the main element in the earth's crust, and most of the water is insoluble oxidation under the condition of neutral and alkaline pH. Existing in natural water, the content of natural water is inherently high), which makes heavy metal manganese (Mn) an item that frequently exceeds the standard. Some targeted measurement stations, such as Dadu River and Daan River, are located in the estuary section of the river and are affected by the rising and ebb tide seawater to high conductivity. The total phosphorus and ammonia nitrogen values ​​of the downstream of the Daan River Zhongke Phase III discharge outlet If there is a high situation, a total of 1,008 tests were performed between January and December, of which 789 were in compliance with the standards for Category C water bodies. The highest compliance rate was 83.3% in September and October, and the compliance rate in other months It is between 60.7% and 82.1%, and the total coincidence rate is 78.3%. Compared with the previous year (108), the overall river water quality in Taichung City this year has deteriorated in some stations so far. It is estimated that due to the poor rain this year, The lowest rainfall in the past 10 years has caused the overall river water quality to deteriorate. (2) Urban area drainage monitoring stations (15 stations), except for dry stream drainage (not slightly polluted), Lvchuan (lightly polluted), and Nanbian Creek (not slightly polluted), the others all showed "moderate" Compared with last year (108), the water quality pollution degree of “Pollution” has been increased to “not slightly polluted” at the drainage RPI=1.92 of Hanxi, and “not slightly polluted” at the RPI=1.98 of Nanbian Creek, and the rest remain unchanged (108) Year grade. (3) The regional drainage of the Taichung Port area of ​​the Hai-line river and regional drainage (18 stations) showed "not slightly polluted" to "moderately polluted", and the regional drainage of the second row of Dingdian with RPI = 1.84 showed "unsatisfactory" "Slightly polluted" water pollution degree; Wenliao River RPI = 2.20, Beishan River RPI = 2.48, Dingdian Zhen RPI = 2.08, the water quality pollution degree of "light pollution", while Wenliao River and Da The drainage of Beishanxi and Dingdianzhen in Area A deteriorated to a level of "light pollution", and the rest remained at the level of (108). (4) The test results of sea water quality (5 stations) show that the coastal water quality in Taichung area is in very good condition. At present, 80 of the 80 tests have met the water quality standards of Class A surface water bodies and the environmental standards for protecting human health. The rate is 100%, and it remains in line with the standards in the last (108) years. (5) Beach water quality (2 stations) July and September reached the "excellent" level. From 3 to June, August and October, the beach water quality was "normal", including E. coli, enterococci and turbidity. Occasionally, due to the impact of ocean currents and the influx of the Daan River, the water quality of the beach cannot be maintained at a "good" level throughout the year.

River water quality, sea water quality, beach water quality