Stormwater Symposium

Oral

394823 - Evaluation of low impact development technologies for urban flood management

Wednesday, June 6
4:00 PM - 5:30 PM
Location: Mirage Room
Co-Authors: Jungsun Hong, 1223-24, Cheonan-daero, Seobukgu, Cheonan city, South Korea, 31080 – Kongju National University; Minsu Jeon, 1223-24, Cheonan-daero, Seobukgu, Cheonan city, South Korea, 31080 – Kongju National University; Franz Kevin Geronimo, 1223-24, Cheonan-daero, Seobukgu, Cheonan city, South Korea, 31080 – Kongju National University; Lee-Hyung Kim, 1223-24, Cheonan-daero, Seobukgu, Cheonan city, South Korea, 31080 – Kongju National University; Franz Kevin Geronimo, 1223-24 Cheonan-daero, Seobukgu, Cheonan city, Chungnam province, South Korea, 31080 – Kongju National University; Hyeseon Choi, 1223-24 Cheonan-daero, Seobukgu, Cheonan city, Chungnam province, South Korea, 31080 – Kongju National University; Franz Kevin Geronimo, 1223-24 Cheonan-daero, Seobukgu, Cheonan city, Chungnam province, South Korea, 31080 – Kongju National University; Franz Kevin Geronimo, 1223-24 Cheonan-daero, Seobukgu, Cheonan city, Chungnam province, South Korea, 31080 – Kongju National University

Low impact development (LID) technologies have been introduced for stormwater runoff management. LID refers to the method of efficiently managing non-point source pollutants while maintaining natural hydrological functions such as infiltration, undercurrent and evapotranspiration. In this study, the optimal range of LID design factors considering urban flood reduction through LID techniques applied in Kongju National University, South Korea were investigated. Eight types of LID including stormwater wetlands, bioretention, tree-box filters and raingardens were used in this study. These facilities performed flood mitigation for parking lots, roads, and roofs, and reduced particulate matter through the pretreatment tanks in all facilities except for the infiltration planter. Peak flow was reduced by 17%, 15% and 72% for road, parking lot and roof, respectively through the LID. During heavy rainfall, the average runoff retention by these LID technologies was 69.8%. For 80% runoff retention, facility surface area (SA)/ catchment area (CA) ratio should be 4.21% while the facility storage volume (SV)/ facility total volume (TV) ratio should be 46% considering rainfall depth ranging from 5 mm to 20 mm. Facility pre-treatment volume (PV) / SV ratio was found to be more important factor for increasing storage efficiency than SV/TV ratio. LID design considering rainfall depth greater than 20 mm was not economical since 80% of the rainfall occurring in Cheonan city was less than 20 mm. Therefore, proper capacity estimation is needed considering the environmental characteristics of the area where LID techniques will be applied should be analyzed and used in LID design.

Hyeseon Choi

PhD Student
Kongju National University

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