Economical and systematical evaluation on rainfall harvesting system.

Suengkwon Jung, Hosun Lee, Mansik Kim

Friday 3 july 2015

12:54 - 12:57h at Central America (level 0)

Themes: (T) Water resources and hydro informatics (WRHI), (ST) Management support systems and serious gaming, Poster pitches

Parallel session: Poster pitches: 15H.WRHI - SeriousGaming

Recently, climate change has caused drought to become more frequent and is becoming one of the serious natural disasters, resulting damages in infrastructure facilities, economy and private property losses etc. Taebaek city of Gangwon-do lies in the northeast Korean Peninsula along the steep mountain slopes, all the way to the sea. Thu, this city exhibit the Marine Climatic Characteristics. During the past 10 years, the average rainfall of Taebaek city is 849.9mm/year, which is less than the average rainfall for the whole country (1,274mm/year). In the period after July 2008, the 6 months rainfall amount is only 141.2mm. And in the months from August to October, the water supply was restricted to 50%. Moreover, the penetration rate of water supply of Taebaek city is only 86.1%, which is lower than the nationwide average of 93.5%. The price of water supply is 1,278won/ton, which is the most expensive. This means that the self-sufficiency of water supply is very low in Taeback city. In order to ensure the self-sufficiency of water supply of Taeback city, this paper aims to describe the implementation of Rainfall Detention Facilities in the open fields of primary, middle and high school as well as propose the plan of water resource demand and supply. The population of Taeback city is about 50,000 with water consumption about 13,250m3 per day (water usage per person per day is 265L). In Taeback city, there are 13 primary schools, 6 middle schools, and 4 high schools, therefore it is possible to achieve a catchment area of up to about 130,000m3. Through this method, about 45,000m3 of rainfall water can be stored, which amount to about 1/3 of the water supply in the case of emergency. Furthermore, the design of the Water Quantity of Rainfall Detention considered the reuse of water for purposes like the toilet flushing, recreation, gardening and cleaning in the school. And this will save about 100,000won per month on the water bill. Till now, the research has finished the assessment for the available catchment area coming from the primary, middle and high schools in the Taeback city. Also, the assessment of Rainfall Detention Quantity and the water saving costs in different scenarios (school types and water use purpose) has been completed.