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You are here : eLibrary : IAHR World Congress Proceedings : 36th Congress - The Hague (2015) ALL CONTENT : Flood risk management and adaptation : Increasing infiltration as a measure to reduce flood risk in an urbanized area
Increasing infiltration as a measure to reduce flood risk in an urbanized area
Author : SHAOHUA MARKO HSU(1), SIAO-TING SYU(2) & PI-FANG HUNG(3)
ABSTRACT
This study targeted on the geological condition in Taichung basin, and taking the current condition of a
parking lot in Feng-Chia University, Taichung City as the study site. By adding vertical infiltration pipes beneath
the permeable pavement of the parking lot, the saturated conductivity of permeable pavement, estimating by the
double-ring test could be increased 18~35 times. The experimental results show that the vertical infiltration pipes
is applicable to be one LID component for increasing permeability with regard to Taichung basin's geological
condition.
The related parameters and field-test results collected from the study site (60 m กม 15 m) were used in the
Storm Water Management Model (SWMM) to simulate the different pavement styles based on the current
conditions. For the conditions, changed to water impermeable pavement, the surface runoff volume would
increase 15% and the peak discharge would increase 10%. If the pavement changed from the current interlock
brick to grass brick the surface runoff volume and the peak discharge volume could be decreased by 12.5% and
5.4%, respectively. Next we simulated the study-site watershed and pavement rebuilt situation considering the
LID module. With regard to installation area and runoff reduction percentage, the optimum reduction benefit,
which effectively reduced surface runoff volume and peak discharge, occurred when the installation area is 10%
of the total, while the installation area of pavement rebuilding situation reached over 20%, the peak discharge
occurring time could be delayed by 10 minutes. By rebuilding interlock brick with grass brick to install the LID
module 10% and compared with the original condition, it showed that the surface runoff volume could be reduced
over 15% in designed rainfall of 1, 2 and 5-yr return period.
In addition, the reduced surface runoff volume and reduced peak flow in the designed rainfall of 1-yr return
period are larger than that in the designed rainfall of 5-yr return period. This result indicates that the LID setting
has relatively larger benefit on lighter rain.
File Size : 820,523 bytes
File Type : Adobe Acrobat Document
Chapter : IAHR World Congress Proceedings
Category : 36th Congress - The Hague (2015) ALL CONTENT
Article : Flood risk management and adaptation
Date Published : 28/08/2015
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