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<br />. MAR~28-2000 TUE 10:48 AM
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<br />F.c.UTUation orthe lIRel LoS.Ii Par.:uuctcJ'S r01" R.outing tho Probable Mllximum Flood
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<br />- SfRTL-'.Oll1cn
<br />-- . $ m,TL . U5 inch
<br />. SrnTL = D.G inch
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<br />CNSTL. 0,1 in~hlhour\
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<br /> 3.00
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<br />~ 3\"1000
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<br />3.50
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<br />STRTL = 1,0 Inch
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<br />- CNSTL a 0.' IllChlhOLlr
<br />.... - CNSTL.a 0.05 InCM10IJr
<br />. . .. CNSTL ~ 0.15 inchitlour
<br />_.. ODNrt
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<br />Time (day)
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<br />l"igul'o a,I~IT..1 orCA) STR'I'L .lId (lIl CNS'!'l, on the PM.'
<br />,It lhlt Outlet of the t~nBlcwooll Willillrllheu, 'rhe: valL\c
<br />STH'fl.. III: ].0 iueh in (B) dOIJ::l not UJ.lply (11\ tho ODNn curvt!.
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<br />III ,'unt.rnst Lo STR'l'I., the pnr:Ulleter CNSTT., great-
<br />ly ;'.lfucll'U tho PMF', llH He"o in Figllre Sb, which al.~o
<br />.1.,.""" the hydro!!Taph obtained by tho ODNR study. A
<br />,.t.d iI,tl"ll ill QNH'I'L hy O,Or. llltltlhuur ro""lto,1 ill ~o
<br />11il"""'''' nftho )leak l'MIo' by about 27 percent, which
<br />i:, l'!1I>0 to Un' peak PMF obtai nod by the ODNR's
<br />SI.II<1)'. 'l'ho incru:Iso in CNS'l'I, by 0.05 inch/hour
<br />tallol"l" reduction in th" peak PMF by about 18 per-
<br />t,,"l. 'I'ho time-to.peak W,," the same for all hydro-
<br />I!I "phs, which iN IJTobnbly due to tho retardation
<br />Ull",," Ill' Ibo ro"orvoir noar the dOnI. 1'hc paramoter
<br />eN:;'!'!. hau mojor eITects on tbe o\ltflow hydrOb'l'apb
<br />\".,'''".,0 the PMP Is a lon~.duration ~torm, and. a"
<br /><1i"'II,.,(;('<1 curHer. 8\1eh .torln. arc IItoatl)' ..ffocled by
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<br />OUl!rtoppilllJ o{the Englewood Dam
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<br />The final goal of this study is to estimate the over-
<br />l.upplnll of the PMF waters at tho ~rest of the em bank-
<br />mcnts of Englewood dam.. ,To determine the effe~t of
<br />the parameters STRTL arid CNSTL on the PMF at
<br />F.ngJewood.Dam, HEel was.run for 110 pairs of
<br />paramcterlvalues"STRTL values ranged from 0,0 to
<br />2.0 inches ili'increments of 0,2 inch; CNS'fL values
<br />ranged from' 0,02 to 0.20 inchlhour in increments of
<br />0.02 inchlhour., '['he resulting maximum depth of flood
<br />waters at the erest of the embankment is summarized
<br />in Figure 9."Overtopping estimates ranged from a
<br />hi gh of nearly: 11 feet abeve the .dam crest to Il. low of
<br />2,3 fcet, below 'the' crest: .The horizontal shape of the
<br />contours demonstrates that the PMF. is not sensitive'
<br />to STR'fL, but'highly sensitive'to CNSTL, Overall,
<br />each increaso' of, 0.01 inchlhour In CNSTL produced a
<br />decrease of about 0.67,foot in the water level at Engle-
<br />wooddam.;~I;,;;:,I...,,1'!."~<<" .', '. ',':'
<br />While the ODN-R's lose 'parameters predict an ov~r-'
<br />topping height of about,S feet,.. the design parameters'
<br />of this study rcsult in an' overtopping of about 3 feet.
<br />Figlll'e 9 shows that no overtopping of the dam would
<br />OC~llr if CNS'fL ,were . !!Teater or equal to 0,15 "inch/
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<br />Fill""' 9. Waier Lovol It tho Bllllllwood Dim It thl pe.l< '
<br />oflbe PMF as . F\lnction .rS"rRTL and CNSTJ... Th.
<br />v.lu. O.O,corre,~onda to the ...,t of tl", "'IlbankmoDI.. .
<br />1'h".c:irclCl Bod the- Iq~ represont the OONn "
<br />~t.1:Idy and the present aLuc!y. rr.spectivaly.
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