Journal of Korean Society on Water Environment (한국물환경학회지)

Korean Society on Water Environment (한국물환경학회)
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The Effects of Infiltration Rate of Foundation Ground Under the Bioretention on the Runoff Reduction Efficiency

식생체류지의 원지반 침투율이 유출량 저감효과에 미치는 영향모의

  • Received : 2019.01.07
  • Accepted : 2019.01.25
  • Published : 2019.01.30
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Abstract

Soil type in LID infiltration practices plays a major role in runoff reduction efficacy. In this study, the effects of infiltration rate of foundation ground under bioretention on annual runoff reduction rate was evaluated using LIDMOD3 which is a simple excel based model for evaluating LID practices. A bioretention area of about 3.2 % was required to capture surface runoff from an impervious area for a 25.4 mm rainfall event. The relative error of runoff from bioretention using LIDMOD3 is 10 % less than that of SWMM5.1 for a total rainfall event of 257.1 mm during the period of Aug. 1 ~ 18, 2017, hence, the applicability of LIDMOD3 was confirmed. Annual runoff reduction rates for the period 2008 ~ 2017 were evaluated for various infiltration rates of foundation ground under the bioretention which ranged from 0.001 to 0.600 m/day and were converted to annual runoff reduction for hydrologic soil group. The runoff reduction rates within hydrologic soil group C and D were steeply increased through increased infiltration rate but not steep within hydrologic A and B with reduction rates ranging from 53 ~ 68 %. The estimated time required to completely empty a bioretention which has a storage depth of 0.632 m is 3.5 ~ 6.9 days and we could assume that the annual average of antecedent rainfall is longer than 3.5 ~ 6.9 days. Therefore, we recommended B type as the minimum hydrologic soil group installed LID infiltration practices for high runoff reduction rate.

Keywords

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Fig. 1. Daily precipitation between Aug. 1 ~ 18 used for LIDMOD3 applicability.

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Fig. 2. The comparisons of outflow from and infiltration in bioretention between LIDMOD3 and SWMM5.1 simulation result.

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Fig. 3. Average annual runoff reduction rates according to infiltration rates and hydrologic soil group. A, B, C, and D mean hydrologic soil group A, B, C, and D, respectively.

Table 1. The dimension of bioretention

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Table 2. Infiltration rate range for hydrologic soil group (Cronshey, 1986)

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Table 3. The comparisons of bioretention between LIDMOD3.0 and SWMM5.1 simulation result using water budget analysis

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Table 4. Annual runoff reduction rates by bioretention based on the infiltration rate

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Table 5. The days required to completely empty bioretention according to hydrologic soil group

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