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. . . . I. I. . i. I. . . . . . . . . . I. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ANNUAL PEAK FLOW FREQUENCY ANALYSI~ Following Bulletin 17-B Guidelines Program peaklq Station - 09112500 East River At Almont Co. (All Values cfs) Annual Expected 95% Confldenoe Umits Exceedanoe Bull.17B Systematic Probability For Bull. 17B Estimates Probability Estimate Record Estimate Lower Upper 0.9950 --- 813 --- --- - 0,9900 --- 895 -- --- --- 0,9500 1,261 1,167 1,248 1,117 1,392 0,9000 1,418 1,345 1,408 1,273 1,550 0,8000 1,643 1,598 1,637 1,498 1,779 0,5000 2,220 2,230 2,220 2,062 2,388 0,2000 3,076 3,123 3,089 2,842 3,369 0,1000 3,686 3,728 3,719 3,365 4,114 0.0400 4,505 4,509 4,582 4,043 5,157 0.0200 5,152 5,102 5,279 4,564 6,005 0,0100 5,830 5,703 6,025 5,100 6,914 0.0050 6,545 6,317 6,831 5,656 7,893 0,0020 7,554 7,153 7,999 6,427 9,304 10,000 ~ .. ~ " ~ 1,000 ~ " .. Q 1/30102 gun_co-9age--peak,xls Station - 09112500 East River at Almont 1.52 Return Period (years) 10 25 50 100 5 1-' ,~ I - -, ~ - r I T -j- -, - ,- - - - - ~ - -- III I I :=:=: -Bull. 178 Estimate :- - :;.._~~- I I I - - - 95% Confidence Umits _ - ,-,-, -- ,-- I I I - - - 95% Confidence Umits "..l. _ -r- \-\-\ \ \ _...,...l..... \ \---( - --- I I I I I I I ,_ _ ,-, I I I I I 1_1_1_.... -1_ -I- _ -l..... ~____ 1-1-1- -I- _1_ -1_ _1_ _ _I- - _ __ III I I ;..'" "'....., III I I I 1 I :-~:;~~ r -~ - -:- - - - - ~ ~ ~ ~ -:- -: - -:- - -:- - - - - I ...., I I I I 11', I I I VI I I I I I II j I I I I II I I I I I III I I I I /' II I I I I I III I I I I III I I I I I III I I I j ,_,_,_ L I ! _ J _ _ _,_ _ _ _ _ j I I I I I I III I I I 1 I 11"-)--\ --,--- ',-,-,-1-1-',---,----- ,-,-'1-'--1-----'----- '-,-,-;--,-1--'---,----- II-IT-,--'--'---,----- '-'-I-I-;-1"--j---I----- 1-1-1-1"-1-;--1---1----- III I I I 1 I III I I I I I 1-'-'- 1 -, -1- -I - - -,- - - - - 11- ,- 1 -1- -,- -1- - - r - - -- ,1_'_'_1__'_1. J________ III I I I I , III I I I I IIII-t--I--,---,----- III I I I I III II 1 I I '-'-'-1-1-1"-;---'. I-I-'-T-'-;--'---t. III I I I III I I I I I III I I ! III I I I I ,_,_,_ L --1 _ 1 _ _1_ _ _,_ _ _ _ _ L L L 1 _,_ J _ _ _ _ _1_ _ _ __ Ill) ) 1 \)1) )) I II I I I I I I I I II II I I I I I I II I I I I I I I I I I I I I I I I 100 1,000 0,100 Exceedance Probability 500 1 r I 1-1- -.J,......--; T T T..;l""--'- -, -- 'F"'T.., - - - r -'- -J,.. .-.~:"l --- J,..lo""I-I'1 I I TTr,-r I--r--r----- III I I I I I 1" T 1" -\ -c -\- - r - -"\ - - - -- III I I I I I .l.-I-.l.-I-I-_I__I-__-I-_____ III I I I I I III! I I I III I I I I I 111-1-\--1--1---1----- I I I I I I I I I ! I I I I I I I I I I I I I I I 111 I I I I \1i-) j \--\--1 111-1-1--,--1---1----- lI1-1-1--I--,---T----- T++;-r--I--r---+----- III I I I I I iii~-~-I--r--i----- 1 ~ 1 _, _ +_ _,_ _ L _ _ !. _ _ _ _ _ III I I I I I III I I I I I 1"T11-r--I--r---t----- III I I I III j I I l!.lJ_L__~L__l_____ 1\ 1 \ " , " , " , " , 0,010 0.001