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Çѱ¹Á¶°æÇÐȸ / v.36, no.4, 2008³â, pp.111-119
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( A Study on a Runoff Coefficient of Block Paved Area with Considering Regional Rainfall Distribution )
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The runoff coefficient for a block paved area is determined with regional rainfall distribution. The Rational Method is a basic equation of a drainage system design and is a function of runoff coefficient, rainfall intensity and area. A runoff coefficient is the ratio of rainfall intensity and runoff. The rainfall intensity which is a function of the return period and rainfall duration differs by region. Therefore the runoff coefficient varies regionally even though there is the same return period and rainfall duration. The ratio of rainfall intensity and rainfall duration is decided by the loss of rainfall. The constant infiltration capacity of Horton's equation is adopted to determine the loss of rainfall. As time passed, the joint of the block paved area through which the infiltration occurs is covered by pollution material, sandy dust, pollen and is hardened by foot pressure, so the constant infiltration capacity may decrease. Six different sites were selected to verify the assumption of the constant infiltration capacity decrease and 10 year return period. 10, 20, and 30 minute rainfall duration were applied to calculate rainfall intensity. The results indicate that the Horton's constant infiltration capacity decreases over time and the minimum constant infiltration capacity is selected to compute runoff coefficients. The runoff coefficients varied by region ranging from $0.94{sim}0.84$ for 10 minute of rainfall duration.
 
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Çѱ¹Á¶°æÇÐȸÁö / v.36, no.4, 2008³â, pp.111-119
Çѱ¹Á¶°æÇÐȸ
ISSN : 1225-1755
UCI : G100:I100-KOI(KISTI1.1003/JNL.JAKO200801440608952)
¾ð¾î : Çѱ¹¾î
³í¹® Á¦°ø : KISTI Çѱ¹°úÇбâ¼úÁ¤º¸¿¬±¸¿ø
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