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Calculation of storage coefficient K (Russel)

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Formula for determining the storage coefficient K of a basin 

K = ¥áTc

where,
Tc : concentration time (hr),
¥á : coefficient according to basin condition; 1.1~2.1 for urban areas, 1.5~2.8 for rural areas, 8.0~12.0 for forested areas

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K = ¥á*Tc
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