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FPMS Flood Plain Delinealion Sludy forlhe Los Pinos River Corridor, La Plata County, Colorado Watershed above Bayfield. Colorado (approximalely 70 square miles) Regional Equations: YS_GS J)6-4101 il .Y~GS96-4112 1 Region 2 . Northwest P,ateau Region Area of basin above Bayfieid" 70.05 sq mi Region 2. Northwest Plateau Region Alea cf basin above Bayflekl = i .i ~ t ~~ 0{2-yrl = Q(5-yr) = Q{tO-y!) = Q{25-Vf) '" 0(50-Vl) :::; 0(100-111) " --I IO.ns sq 1'111 1.-~t(ll. 99 .0 m z -I. lD -< Jl~GS 85-4QS6 (Wes~~r:~. cO.!Q!_~~c?) -----.....-1 Area of basin above 8a~'fi~:d = 7{}.05 s.q m'. !: Mearol3asin EIe,,'minus 50Q.:ltt pel 1000 It 3.0 t ~ '. "1J r z G) II- m z < H :D lD :D )> Z (') :E: 732 cis 1510 cis 2179 cts 3255 cfs 4211 cfs 5251 cis OI2-YIi = 624 cis 0;2-\,1) = 449 cfs Q(S-y') = 1391 c's 0(5'YI} = 994 cfs Q(1C-Yf) " 2161 ~s Q(' O-Y!'l" 1215 cis O':2S-yl) = 3289 cls 0(25-yr) .:: 1659 cfs 0(5C"YI) '" 4426 cfs O(50-yr) .:: 19n cfs Q(IOC.yl) = 5773 cfs Q{ICC-~~) = 2302 ::Is Q(500-yr)= 9813 cIs Q(200-yr}= 2668 cis Q(500.yr}~ 3178 cfs h Co> -" , (0 (0 USGS 93-419 U~GS 93-419 Co> t11 '" USGS 93-419 Region 8 - Four Comers Region Area of basin above Baylield = 70.05 sq nj Mean Ba$in Elevation = 8013 NGW Region 1. High Elevation Region Area of basin above Bayfield = Mean Amual Precipitation" = O(Z-yr) =: Q(5-yr) = O{tO-Yf) :: 0(25-yr) ... Q(5()-yr) = Q(100-yr) "" 602 cfs 1230 cfs 1754 cfs 2620 cfs 3404 cfs 4221 cfs 0(2-y') '" 0(5-V') = Q( 10-y') :: O(25-Y') '" 0{5O'YI) '" 0(100-YI) :: 266 cfs 463 cfs 609 cfs 801 cls 947cfs 1089 cfs 70.D5 sq mi 17 il1ches Weighted flood-fntquency relations (equation 7. p 211 Weighted Region 8 and Region 1 values Elevalion of Coneeewation Point (8aytield) "" 6877 t11 o t11 Co> ~ I\) Co> ~ o:l (0 H V ~ 9 0(2-yr) = C(5-yr) = 0(10-)'r) = Q{25-)'r) '" O(50-yr) '" Q(100-v() = 565 cfs 1146 cfs 1628 cfs 2420 cfs 3134 cfs 3882 cfs li I CWCB Guidelines forJ;l~!ermln.na 100-vr flood Flows. Draft. Janua~J999 San Juan River Basin USGS.VAILL Regional FreQuencv EQuations For Colorail.e;., Oraft. 1999 Southwest Region Area of bas;n abo'.'e Bayfie d = 70.06 sq mi Q{10U-yr} = Area o! basin above Ba~'field:: 10.05 sq mi 5189 c.fs ; ~ Ii Q(2-y') ': Q(5-1I!) <' Q( 1 C-YI) = Q(25-YI) '" Q{50-yr) = O(lOO.yr} '" OI:201).yr) " QI:SOQ-yr) = :! j: I: :i " " :1 . C?leir.~d fro.. 'Ial'v..!l> OaT> all" R"'~e""~r C~e'<l~ors I.'."ul !'Iale "-4. Seple...be! I~~ ('JS;..cOE) 560 cf<s 960 c.fs 1216 cfs '719 cl$ 2075 ds 2471 cfs 2888 c~s 3515 c~ i II ~ Co> o Co> o:l 0) 0) ~ ~ '" ~ ~ I\) - I\)