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김이태 ( Kim I Tae ),서재승 ( Seo Jae Seung ),이동률 ( Lee Dong Lyul ) 한국물환경학회 2003 한국물환경학회지 Vol.19 No.4
Although the urban water demand per capita per day (lpcd) had an increased trend Until mid-l990s, since then it has become reducer and stable In this paper, the urban water demand divided into domestic water and others. which is business, commercial. public bath, and industrial water demand in city This paper evaluates the characteristics of urban water demand use and trend, and forecasts long-term demand considering the recent character with two exponential models Modified exponential model (Model 1) and least square method exponential model (Model 2) applied to the whole country and five cities The results of two models show that urban water demand is predicted to approach to stable level in 2011 year The forecasting of domestic water demand gives better results compared with that of other water demand in evaluation to mean absolute percentage error of both models
김영철 ( Kim Yeong Cheol ),박재홍 ( Park Jae Hong ),이동률 ( Lee Dong Lyul ) 한국물환경학회 2003 한국물환경학회지 Vol.19 No.6
The results of investigation for the long-term changes in water quality of the small streams in agricultural reservoir indicate that nitrogen is determined mainly by the agricultural activities while phosphorus and suspended solids are affected by the soil particles moved by irrigation return flow or/and rainfall discharge. However, nitrogen is related with factors of the flow more than suspended solids concentration but rather tends to decrease with the abundant stream flows caused by rainfalls. As the use of land for rice paddy in the watershed increases, more nitrogen loss was also observed. It was found that about 50% of the total phosphorus and nitrogen exists in dissolved form. There is a possibility to develop tools which can be used to predict dissolved forms of the nutrient by TDS values easily and reliably measured by electrical conductivity. Coefficient of determination(R²) between TDS and phosphorus concentration was higher than the nitrogen concentration. Especially, the more rice paddy area, the higher correlation coefficient. In addition, TDS was inversely correlated with flow(or depth) due to the dilution effect of rainfall water, so that multiple rating curves from flow depth to approximate TDS and then nutrients could be useful. Most of the water quality parameters were found to have a log-normal probability distribution.