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<br />10 <br /> <br />TECHNIQUES OF WATER-RESOURCES INVESTIGATIONS <br /> <br />6000 <br />5000 <br />4000 <br />3000 <br /> <br />2000 <br /> <br />....... Ia <br /> . <br /> <br /> 1000 <br />" <br />z <br />" <br />'-' <br />"' 600 <br /></> <br />'" 500 <br />"' <br />Q. 400 <br />>- <br />"' <br />"' 300 <br />>- <br />'-' <br />ffi <br />=> 200 <br />'-' <br />" <br />"' <br />'" <br />'" <br />'" 100 <br />J: <br />'-' <br /></> <br />C <br /> 50 <br /> 40 <br /> 30 <br /> 20 <br /> <br />10 <br />1.01 <br /> <br />30 <br /> <br />50 <br /> <br />1.1 1.2 <br /> <br />2 3 5 10 <br />RECURRENCE INTERVAL, IN YEARS <br /> <br />20 <br /> <br />Figure 7.-Frequency curve based on data from table 3, assuming that data are annual minimums. <br /> <br />I defined by the data of table 3 is computed as <br />follows: <br /> <br />For comparison with the graphical curve of <br />gure 6, the theoretical Pearson Type III curve <br /> <br />Mean=Q= L;Q/N =12,486/36=347 <br /> <br />Variance=SLL;Q'- (L;Q)'/N <br />N-1 <br /> <br />_4,542,500-155,900,196/36 -6055 <br />35 <br /> <br />Standard deviation=S=77.8 <br /> <br />. N'L;Q'-3NL;QL;Q'+2(L;Q)' <br />CoefliClentofskew=O,- N(N-l) (N-2)S' <br /> <br />(36)2(1,738,665,756)-3 (36) (12,486) (4,542,500)+2 (12,486)' <br />(36) (35) (34) (6055) (77.8) <br /> <br />0,=1.04. <br /> <br />. <br /> <br />. <br /> <br />100 <br /> <br />. <br />