도시지역 물이용 및 홍수재해 저감을 위한 빗물저류방안에 대한 연구

Abstract

The uses of rainwater for living, gardening and fire fighting are needed. The rainwater is recognized as the most appropriate alternative to secure water resources and prevent floods under the present condition such as the damage of floods. This paper studied the possible rainwater storage capacity of each housing site and house type to prevent flood damages caused by severe torrential rain and typhoons every year. The findings and conclusion of this paper are as follows: The rainwater storage capacity is 2,215,000㎥, 889,000㎥, 73,884㎥, respectively, for each site of school, park and play ground. The rainwater of 712,671㎥ can be stored in the independent houses in Seoul for a day while the apartments can store up to 961,421㎥, 1,201,800㎥, 1,442,161㎥ in the case of 20%, 25%, 30% of the building-to-land ratio, respectively. When the rainwater is used as a garden water, cleaning water instead of tap water for 110 days of a year, it can be saved 184,150 thousand ㎥ at least, 237,032 thousand ㎥ at a maximum. If a student uses 10ℓ of rainwater as toilet water instead of tap water at 30%, it can be saved up to 1,633,520 thousand ℓ/year. This means that the amount of tap water can be saved more 1,634 thousand than before as well as the charge of tap water can be reduced as much as 10.6 hundred million won if the rainwater is used.