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Last modified
1/25/2010 6:48:30 PM
Creation date
10/5/2006 1:18:17 AM
Metadata
Fields
Template:
Floodplain Documents
County
Summit
Community
Breckenridge
Stream Name
Blue River
Basin
Colorado Mainstem
Title
Technical Addendum Floodplain Information Blue River
Date
12/1/1974
Prepared For
Summit County
Prepared By
Leonard Rice Consulting Water Engineers, Inc.
Floodplain - Doc Type
Floodplain Report/Masterplan
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<br /> <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br /> <br />APPENDIX I <br /> <br />Calculations of Criticial Updraft Areas <br /> <br />Assumptions: <br />1) <br />2) <br /> <br />. . <br />Area' of the updraft equals the area of the <br />precipitation <br />Cloud water to prec~itation water conversion <br />eff'iency average 55" with a low value of 20% <br />(Auer & }~witz,1968) <br />3) Average updraft velocity 400 em/see <br />4) LCL 13,0001 MSL. (2.1 km.) or 620 mb. Newton <br />(1966),Fankhauser(1971) and Auer& }~witz(1968) <br />Climatological Data.: <br />l~ol'lllal Daily Maxil11Ulll Temperature for target area <br />J1.Ule 7 O' F <br />July 750 F <br />Augus t 750 F <br /> <br />The water content of the air was determined by lift~ng an air <br />parcel dry adiabatically,with the surface air temperature, <br />f'rom the surface to the lifting condensation level (LCL) and <br />assunrlng that the parcel at this temperature is saturated. <br />These calculations were accomplished by using a Skew-T thermo- <br />dynamic diagram to estimate the temperature at the LCL and then <br />using the SIni thsoni an Neteorological Tables to deternrlne the <br />mixing ratio at the given pressure and temperature. <br /> <br />Calculation of the updraft area was then accomplished by <br />calculating the ammount of air that had to be processed,at <br />a given effiency,to produce the given volume of water. <br /> <br />) <br />I <br />'\ ) ') <br />. r ) <br />__ _ SJ- C1o..od U 00#) _LC.L_ <br /> <br />.,/t V .'1~,OqVi / / [ ~ <br />/ re/Ev,{,p(l./sk y,\ <br />/../.~/I'/' /"/' <br />, I.' , r ... <br /> <br />L <br />I <br />r <br />~ <br /> <br /> <br />A= critical updraft area. <br />E= cloud effiency <br />Q= volume rlux 01' water <br />W= updraf~ velocl~y <br />w= sa~...'ated mixing ra~io <br />~ = densi ty of air <br />fw= density of' water <br /> <br />Q= A W w Ii. f/ (> <br />A )tlI "- <br />A= Qf,./ I-lw .c.f~ <br /> <br />.Calculation Results <br /> <br />Volume I.'lux (QJ <br /> <br />J C4.u. J6.-,;-a~ ("",~8~~ a_ ft.') Ciu.. Cwot;.;" --Q- ~/t.. . <br />I ... 030 /.I.JZ.- "/A/~ <br />A .1'0 ./..l'l~-"'J"'/ UI'V <br />1.8 - 7i' 1/.'1't3lC.JO', .710 2.0'ilXlo't <br />Ie /00 12. S'1o '1../0' 'I' . 810z.73()X/C" i <br />1 n ' <br />'0 ISO 3,811S' X 10'" .'Vlf( ;3.'1'JfX/O: <br />l el.!j:) 4.~-33 x/o'" I .'Uo 1'1. Sl1 )(/0'1. ; <br /> <br />Precipitation = 2.u" <br />over 6 brs. for tne <br />lUu yr. event. <br /> <br />ref. ~ech. Faper 4v <br />
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