Architecture
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»ç°¢Çü(±¸Çü, rectangular cross-section) ´Ü¸é °ü¼ö·ÎÀÇ ¼ö¸®Á÷°æ(hydraulic diameter) °è»êÇϱâ

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¼ö¸®Á÷°æ Dh´Â, ±×¸²°ú °°Àº »ç°¢Çü ´Ü¸é °ü¼ö·ÎÀÇ °æ¿ì ¸éÀû A, Á¢¼öÁÖº¯Àå P ÀÏ ¶§, ´ÙÀ½°ú °°Àº ½ÄÀ¸·Î °è»êÇÒ ¼ö ÀÖ´Ù.

Dh = 4*A / P
    = 4*b*h / (2*(b + h)) = 2*b*h / (b + h)

*** Âü°í¹®Çå[References] ***

https://en.wikipedia.org/wiki/Hydraulic_diameter
Dh = 2*b*h / (b + h)
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