|
<br />
<br />"'; ,
<br />
<br />"
<br />
<br />, , ' ,',."
<br />and. meteorological indices which ga,ye)l. !lIWCimUlllcaverage px'ecipi-ea~f6!1\, '[':
<br />of 8.46 in9h.es :i~a,4-hourperiodw:t~J,1 a"mtpcimUlll ;J.",hour, t.aJ:hfall :o,t:",',':;;,:,;
<br />2,39 inches'. ,.. c ,,,' .." ' ,""":L ,,',' ,\ :.."" ....,
<br />. ' .\ "~'(i :,-;',.' :'L ~~i;':,'!',/
<br />, .. ; ,','1: . ,',' ':",.. ~ ' , ' , . . ~ .:, ,,' ' . , . ,~ '" ' ' .' ": " ',> ',' '-';. ,. " .,1, '1 ' ".~:
<br />. . 3-Q2~: Af'l;~ 'ipj,tia11dsil conditions w.ere~ ,f!Rtis:t'iedr~he:ififhi~1.in) "");'~
<br />J.nfJ.ltrat:Lon q~t!=', oi.; ,0.40 ilJ~. per ,hour was us~d:" 'rhe: ;standar?:~roje:?:t;'l:' j
<br />flood wa,~ "c~f'J1ted~'W apP~J.ng :the, estimated runoff' to, the' ,a\loJ:i!,Eld.,:umt, , ,
<br />hydrogJ:'al?b., ~his-,re!:fulte<l- ifl;iflood ,at Pinqn, C.mon ,Dmnsite''With -a"", ",'
<br />peak d1'scjl~li\e'9f 1.400 cup;f.cfeet per: ~ecimd anda"vol~ or.393~C!i-~~"::;
<br />feet. wh:l.cn j"s'equ:J, valent to 6.46 incheS of runoff. ,T1'!e "above flood: ','
<br />wail' sele~~'~l~~ ,th&standard project :~ioO.d 'because, tl1lt :volume"wow#;; :" ',',
<br />be more, "F;ri,ticl4, far des,ign of, thedall\,' although a mOl'e intense 'rain,': , , """
<br />of shm'ter, ,duration could .have peen selected tnat would'"produoe a peak' ,,"
<br />of about:2;'OOO'cub;i.c feet per secon'd. at the dam site. but of a'.'sm8.l1er
<br />volume.. ' SUch a flashflocid'W/iS' est:l.rita:ted for, use in the economic
<br />studies. The standard project flood' s'e;Lected for the prO<je,ct' design ':', '" ,:,',,:-
<br />is about 42, percel}t and 65.percel"!t'pf ',the 'sl?illw~ design!,:t;:;Lood in 'I i,;
<br />pe~ di~9,~axge and volume..j:\;l!l~Ot,W~:W':' ", i:\,: .,' , ':' ,:;,i'"" ,"
<br />,":' " ,,','.' .:-;'~\; >:';;:1)\ \ ,l" I' I 11; )t,' ":.. ..... ,"
<br />3-03. ,Spillway c!esign'it41do4.:~' T)J.e max:l.ml.llll possible ,storhi wasobo: '
<br />tained ~r,ol11',depth~ax:l'la, curvas!de:valope'd!;for ,small areas in :the' Pecci's''':',
<br />River Baii:i.ll.:ibY:. the Hydromatao~ologioaiLSe.ct:io~,oi t];J.e Weather Bureau ~ "
<br />An adjustmai:1t, was made for njeiteppplpgiqal',flfrl ,topographiC :charac.!,er'- " "
<br />istics of the' watershed. Depth-'aJiea.c"ur,ves,'t'or ~mall areas, ihJ'the .'
<br />Pecos Ri Vel: Basin ,.were sele\}te4"beOause of: the small amount: of', adjUs'\;'" "
<br />ment req*ed. Thesfl: curves ,wer-e extr~poiated A-om 10 square'milefii:i({ ""
<br />1 :;lquare )iile.An analysis o!tha maldl11Ull1, possible rainfall'tcurves )'or " " , ,',
<br />the Arkansa:;lRiverBasin above Oaddoa.i Color'a,do'. prepared, by""':t11et4eath~*:.f:"
<br />Bureau and ..uti1i~ed in the: design of John Martin Dam and Reservoir . in': ,,':' ' ,
<br />dicated tha:t i!"1ese cur:ves:'Ilr'e for larger ~ea stor,mlland are I).'ot app:!:i- ",,,, .
<br />cable to a smaH !U'eS >of ;It 5'CJ.1WI~ inile. ",1.'he adop;tac;l maximum possible
<br />storm rainfall,iIl l!'hour periods':'ahangeq.,in criUcal, ,order. is:as "
<br />follows: ' '/;,;', ,,-:, ' """, " ',;
<br />,,{:~'.' "..1;" ,J ',;. '{~,"";~'::. "i';>- ..:';;.L;,i~
<br />'1.' "J.. .),:,"j
<br />6' 7 ",;8, ",i):.9 Total.
<br />.
<br />
<br />.
<br />
<br />"1'.'1
<br />
<br />.
<br />
<br />,
<br />
<br />\.".
<br />
<br />No. of 1:ho~
<br />intery,a,ls
<br />
<br />,.-.J
<br />
<br />'''4 ';','.'2'
<br />2'.',,:')'" ";J
<br />. !J:', '!.: ,~:. ,,'!' .
<br />
<br />. 'd~~~ .,.', :
<br />
<br />." ..',,".....
<br />
<br />.',__.J
<br />
<br />,,1
<br />
<br />Rainfall in
<br />inches 0.5 0.8 1~il.6 '5.6 2.4' 1,2 0.9 0.6 ,14.l
<br />. ,{~ .....,. I"'~";:: L ,:,':'.~ # ..' :" "
<br />3-04, ," The runoff . from th:l:.siliJtorm {-ainta).); was:a:et'~~it;~d::t';~~~ti;;':",,;,:, .,'"
<br />ering an in{tiill,loss and",a minilniim infiltriJ.:tionr!1-te',:of,~0..40'.incili;'per:;c' '" ,.j ,,' "
<br />hour. The spi~tj'i~:p.eSign.f~ood:lWaf1 cdm~ilte9 by app1yi~..,the3es~imtt~'drr:I' :'":,',,
<br />runoff from"t,he,l)laxJJnUlll pCfl:JlJ.ble 'storll\tothe: adopted .W,l;tlt",hydJl!'0graph i"," , : ',"',
<br />Th:j.sresultEidin ,a g,ood hy.'drograph wiit)h apellkciis~harge o~'3';360' cUb:tq';"" ,.':''', ',;,
<br />fe<;\t per secqIlfiaoo:a yplume,'of 608 aC;t'e-t'~~~,which" is'!ilqu;l:1<alent',W''.' J",:,"',:,: '"
<br />10;00 inche!! oi.,runoff., :.-"ii,':, "".,'" 'i,;'," ~s.u" "" ">,,,'~ ',',(":',: '\
<br />,~:!,.,'. ' " . ,:',.,'1'.. :',: :"':"", ,':; .--.: ',,'.. ~ :,::,,:~,,::".?~r~;;:.",~',l' ~"" ..L~',)€':)~'''''' ,t,.
<br />l".1.,., ,,: f. bl~ : ~~'. '.
<br />'.,' ,,_...' '. ,:." i.. ,,~l ,.',
<br />
<br />.
<br />
<br />-u-
<br />, ,
<br />
<br />,~ ':,,''''
<br />
<br />Appendix I
<br />
<br />i:l~l.:: ..'::q.,
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