| Summary: | 碩士 === 國立宜蘭大學 === 綠色科技學程碩士在職專班 === 103 === “Environmental Water Quality Monitoring Program” from Environmental Protection
Administration Executive (EPA) focusing on monitoring water quantity and quality is strict to
restrain the condition of the weather on the sampling day. For example, when the rainfall
exceeded 50 mm, the sampling should be postponed by 1 day. If the rainfall exceeded 130
mm, the sampling should be postponed by 3 day. However, this rule costs a large amount of
labor, cost and timing consuming for the inspect agency. In our research, we decided to know
the effect on limited of rainfall changes in the concentration of the elements. We collected
the water quality and hydrological data form “Feitsui Reservoir" and found that the water
quality was affected by Chlorophyll-a (Chl-a), Transparency (SD) and Total Phosphate. The
raw data was sampled on 5 spots and we use Excel analysis tool to sort out the total rainfall
data before sample date to find the significant correlation coefficients of the regression trend.
We found that: (1) the rainfall was obviously affect Chl-a than SD & total phosphate (2)
re-quality statistical regression concentrations and the degree of change by four quadrants
method of Hydrology will turning the result when the capacity over 75.5mm (3) the statistics
results shows that only Chl-a will have negative impact to diluted by rainfall, but the SD and
total phosphate consistence was not markedly change by Carlson Trophic State Index (CTSI).
In this study, the results indicated that water quality of reservoir was not extremely changed
by heavy rain even transparency and total Phosphate.
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