Ecological society and energy conservative systems has become a subject of world wide attention. To examine the technologies of such systems as resource recycling society, this study is proposed for using rainwater as energy source and water resources in urban area. Useful informations for planning of utilizing rainfall as energy source, water resources, emergency water and controlling flood are discussed with model systems in urban area. It is calculated that the rate of utilizing rainwater, amounts of utilizing rainwater, substitution rate of supply water, amounts of overflow rainwater according to rain storage tank volume. By applying the past weather data, The optimum volume of rain water storage was calculated as 200m3 which mean no benefits according to the increase of storage tank volumes. For optimum planing and control method at the model system, several running method of rainwater storage tank was calculated. The optimum operating method was the using weather data as 3hours weather forecast.

water quality analysis of rainwater collected from catchment equipment(2m×1m) was conducted to determine its suitability for domestic purposes, in this study. As the results of analysis, the pH of rainwater was 6.3±0.3, and the turbidity of rainwater was over the 5 times than drinking water guidelines. For the usage of rainwater as the domestic and drinking water, the rainwater is need to treat. The analysis value of BOD was about 3 mg/L and the values of heavy metal as the Pb, Cd, Fe, Mn, Cr6+ and Cu was satisfied with drinking guidelines. Overall results of analysis support the possibility of rainwater as the domestic and drinking water.

본 연구는 우수를 생활용수로 활용하고 있는 도서지역의 재래적인 우수이용방법을 개선하고 안정적으로 생활용수를 공급할 수 있는 우수이용 시스템을 개발하는데 연구의 목적이 있다. 이를 위하여 연구의 대상지역으로는 제주도 지역을 선정하고 실제 강우 및 생활용수의 관계를 run이론을 이용하여 규명하고 그 결과는 우수이용 시스템의 집수면적과 탱크크기를 설계하는 기법을 제시하였다. 실제에 적용해 본 결과, 설계된 우수이용 시스템이 제주도지역에서 안정적으로 운영이 되

This study was carried out to investigate the chemical characteristics of rainwater sampled in Cheju City from July 1994 to June 1996. Concentrations of major Ions (Cl^-, SO_4^2-,NO_3^-, Na^+, K^+, Ca^2+, Mg^2+ and NH_4^+) were determined. The pH of rainwater, calculated from the volume weighted H^+ concentration, was found to be 5.61, indicating extensive neutralization of the acidity in the rain. The relative magnitude of average ionic concentrations followed the relation Cl^-> SO_4^2-> Na^+> Ca^2+> NH_4^+> NO_3^-> Mg^2+> K^+. The ions associated with sea salt, namely Na^+ and Cl^-, dominated the total concentration of ions in the rainwater and the SO_4^2- ion accounts for 20% of total concentration. [H^+]/[nss-SO_4^2-+NO_3] ratio and a multiple regression for SO_4^2- and NO_3^- ions against H^+, Ca^2+ and NH_4^suggested that all of SO_4^2+ and NO_3^- in rainwater was not necessarily associated with H_2SO_4, anf HNO_3, but might also occur in combination with NH_4^+ or Ca^2+. The monthly mean concentrations of SO_4^2-, Ca^2+ and NH_4^+ in spring time was higher than those in other seasons. These results may be attributed to the fertilizer application as the local sources and the yellow sand phenomina as a regional-scale sources.