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035 _a.b10228317
099 9 _aAIT Thesis no. 452
100 1 _aAltamera, Rogelio R.
245 1 0 _aEffect of sample sizes of daily runoff records on some statistics
260 _aBangkok :
_bAsian Institute of Technology,
_c1972
300 _a128 p.
490 1 _aThesis ;
_vno. 452
500 _aA thesis submitted in partial fulfillment of the requirements for the degree of Master of E~gineering of the Asian Institute of Technology, Bangkok, Thailand.
502 _aThesis (M.Eng.) - Asian Institute of Technology, 1972
520 _aHydrologic events such as river discharge are often regarded as continuous processes. To make the analysis simple; hydrologists measure it at equal time intervals and assume the data obtained as discrete values. Using the same valid assumption, daily runoff records of Mae Ping River (Station Pl), Thailand, were obtained and analyzed. It was assumed further that daily flow observations in a particular month belonged to the same population. From these populations, samples of size n-years were drawn. Values of the mean, standard deviation, coefficient of variation, skewness coefficients, and serial correlation GO efficient of lag one, two, and three were obtained for each of the samples It was found that the relationships between the maximum positive and negative deviations of these statistical parameters in percentages of their long-term values, and the period of record used, can be described by the relation Y = Ýe{u221D}n where Ý and {u221D} are unknown constants, Y is the percent error, and n is the period of record used in years.
650 0 _aRunoff
700 0 _aSubin Pinkayan,
_eChairperson
700 1 _aNakamura, K.,
_eExamination Committee
710 2 _aUSAID, Scholarship Donor
810 2 _aAsian Institute of Technology.
_tThesis ;
_vno. 452
856 _3Full-Text
_uhttp://203.159.5.9/ait-thesis/detail.php?q=B24327
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