|
<br /> ()
<br />"'- 0
<br />,
<br /> I 0
<br /> I
<br /> I el.
<br /> 1
<br /> I
<br /> I "--'
<br /> /
<br /> ~...
<br /> I
<br /> I \J
<br /> (-,
<br /> I ~
<br /> I U
<br /> I
<br /> i "
<br /> i ,,-~
<br /> I 0
<br /> I
<br /> I
<br /> 0
<br /> \...)
<br /> ,-.
<br /> 1.....
<br /> ....
<br /> \.J
<br /> ,- ,
<br /> ~
<br /> -.
<br /> -'
<br /> "
<br /> e,
<br /> ,-
<br /> u
<br /> {--'.
<br /> \
<br /> , ,
<br /> \
<br />
<br />Ya~,pa River basin to account for the highec density of \1c6r~i_;lj_ r.'-'il In tl;~se
<br />areas. This is consistent with the approach used for the StC<li.'""._,t SprilOgs
<br />rPI study. Lower initial losses We!:e used for cOillj:>utatloa of t],e .June SPF
<br />as co~pared to the August SPF since it is believed that wetter LJ:OUlld
<br />conditions would ~xist in June.
<br />
<br />d. Flood routings - Flood routings betw"en various points OIl the
<br />Y""'pa River were accomplished using the Tatui" routcLng procedure. Tatum
<br />steps ,,"'ere est<J.blished so that tr2.vel tir.les for the. SPF were c(pli.valent
<br />to tlwse, observed during the April 1974 flood. Flows were not routed
<br />bet;;cc,,- the various index points OIl fortification Creek ,md the ether
<br />tOw-JaIl stream.s around Craig. These routJngs will be ac:co::;:,plished by the
<br />Flood Plain Hanag('""ent Section.
<br />
<br />e. .?_~~=-~--'=2.1?~ R~_,=-~ - CocJputati.ous of the general rain SPF for the
<br />~Yaopa River i.."ere Dade fot" both the Jur..e and August stores using the
<br />stort:l ar.:.oents, unit hydrographs, loss r<1t.es, 2nd routlng criteria
<br />discussed previously. The effects of the small reservoirs in the
<br />basin (see paragraph 2) ~cre neglcct~d sillce they COlltrol relativ21y
<br />s~al1 areas and do not have ~ny dedicated flood control space.
<br />CO;J~)utation of the June SPF t.;as t::.2de assu;jd.ng that all arC-2S below the
<br />June snm,lline (8.500' elcv) v,;erc. contributing. Sl1D~L:elt '".Jas 3.ccou'i1ted
<br />for by using a bascflow equal to the JUDe sr:owluelt pxper 1(,;1ccd during
<br />high ~u~off ye2rs. Co~put2tion of t!lC ^U~U3t SPF ~2S ~2dc 3SSt:;~i~lg
<br />tllat tllC c~tire basin was contrib;Jtir:g 2nd that b~!seflow \;~S cq~31 to
<br />normal August flo~s. Resulting st2~d~cd project flo~ds 2t sev~ral
<br />points on the YarJpa River are t2.bult!.tr,:d below. Also sho;"'-I1, fO,L
<br />comparison, are flows developed for the same paints in otllcr studies.
<br />
<br />------.l..o"-"_t ion
<br />Yc,-1J.pa River ac S t e,,:mboa t Sprin~s
<br />Y2 l:J.p 3 River at Hayden
<br />Y~lr.pi1 Rive:: at Craig
<br />
<br />PCCik Flow(cfs)
<br />DA June Aug
<br />_J~'l,----".,jJ__..sX~__...J3_P_~
<br />
<br />Pk. Flow's
<br />from other
<br />studies
<br />..___(cfslnn_
<br />
<br />11.500 (1)
<br />
<br />2/,900(2)
<br />
<br />604
<br />
<br />8200
<br />
<br />13800
<br />
<br />1430
<br />
<br />25000
<br />
<br />2.3000
<br />
<br />2131
<br />
<br />29000
<br />
<br />2.3000
<br />
<br />(1) srI-' from Stc..,,"c,oat Sprin[s FPI sr:uriy
<br />(2) 500 'fro flood frc.m USlJR Flood Iw.;'_!r:~llce St:_lliy a(: !:ay(~c!1.
<br />
<br />111C J\me SP~_.at ~.~~~Jg__""'3S adopted f'or tbis _:~t,l~(iy_~__
<br />
<br />f. _C_l().~_d_l~~lJ_?_t__2~,-~I~f)_C2._~~J_~ - Cl')\!dbl1rst floods on Fortification
<br />Creck i~:,:d ~!J(~ other D;;]all strc.Jcs ~~,r':)uIld Craig ~~;crc: cO:_;:,l)utcd u~;ing the
<br />~;torm .-l::.-,:n:nts, unit ll)-'drographs :llId loss L,tcs discussed pr+cyjol.lsly.
<br />
<br />9
<br />
|