Pollution and Water Quality Evaluation for Tseng-Wen Reservoir

Chang, Chia-Hsuin; Wen, Ching Gung; Chuang, Su Maan; Lee, Chih Sheng; Chang, Shui Ping; Wu, Jonq Lin; Liu, Pao Wen

doi:10.1061/40737(2004)125

Cited by 3 publications

(2 citation statements)

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“…The percentage of forest land cover in the entire watershed (TCW accounts for only 4%) is 77%, from which NPS contributes approximately 80% TN and 73% TP of annual loads to the reservoir (Chang et al 2004). …”

Section: Fluctuation Of Annual Load From Npsmentioning

confidence: 99%

“…Since forest land occupies a large drainage area (only 20% area in Taiwan is inhabited), forest runoff may indeed contribute a major fraction of NPS pollution, in particularly considering the rainfall intensity and duration. For example, it is estimated that 90% of the external phosphorus loading of Tsengwen Reservoir, the largest reservoir in Taiwan and one of the major drinking water supply sources in southern Taiwan, originates from NPS pollution resulting in significant problems in subsequent water treatment (Chang et al 2004). Thus, quantifying the extent of NPS loads from forest areas in Taiwan is of importance.…”

Section: Introductionmentioning

confidence: 98%

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Nonpoint source pollution loading from an undistributed tropic forest area

Chang

Wen

Huang³

et al. 2007

Environ Monit Assess

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Water quality and unit nonpoint sources (NPS) pollution load from a forest area were studied in a mountainous watershed in Taiwan. The flow rates were measured with rectangular weirs and samples taken for water quality analysis in both non-rainy and rainy days for 2 years. The subroutine of the Hydrological Simulation Program--FORTRAN was used to simulate runoff for additional 3 years. Total annual loads of various water quality parameters were then estimated by a regression model. Most of the parameter concentrations are higher during the rainy days; their values are typically higher as compared to data from other undisturbed forest areas. Nevertheless, the concentration ratio of dissolved inorganic nitrogen to TN or PO4(3-) -P to TP shows TN or TP no correlations with the flow rates, whereas the concentrations of SS and TP are positively correlated with the flow rate. The fluctuation of annual load from this watershed is significant. For example, six major events of the entire year, for which the total duration is merely 6.4 days, contribute 42% of the annual precipitation and at least 40% of the annual NPS loads. The management for controlling the NPS pollution from this forest watershed is discussed.

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Section: Fluctuation Of Annual Load From Npsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 98%