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Extracted text: Forces effect on dam are W=200KN, Hh=100KN,Hv=55KN,U=70KN, external vertical force toworeds down=40KN, the vertical component force is إختر أحد الخيارات KN Up 145 .a O KN down 225 .b O KN down 365 .c O KN Up 115 .d O