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". II' I. III 1 __1.1 .~I.I I I ", ~ HEC-2 WEIR/SPLIT FLOW LINE HEC-2 CROSS SECTION (TIED TO TEA STATIONING) TEA STATIONING ALONG CENTERLINE OF CREEK 100YR SPILL FLOODING FLOW NOT CONNECTED TO MAIN CHANNEL PROFILE 500 YEAR FLOOD BOUNDARY LINE SCS STATIONING ALONG CENTERLINE OF CREEK 100 YEAR FLOOD BOUNDARY LINES BASE FLOOD ELEVATION LINE CREEK CENTERLINE 500 YEAR FLOOD BOUNDARY LINE 100 YEAR FLOODWAY BOUNDARY LINE 100 YEAR FLOODWAY HORIZONTAL SURVEY BENCHMARK U LEGEND HYDRAULIC NOTE: HEC-2 section at section 22071 different tho~ topo. HEC-2 section derived from aen~1 photography. Therefore. HEC-2 section more accurote than topo and the 1 OO~year floodplain platted per HEC-2 section. x x \>~ J J * r . C~altan R,aad. r1dge details from MWE drawings April Tnple 8.5 X 15' CB's Deck elevation = 505.80 Low chord elevati~' = 5504.20 X Upstream invert = 495.7 Upstream invert(low ow cell) = 5494 7 Downstream i~ve~t = 5495~ r--- . Downstream .invert (law flaw cell) = 5494.1 '96. Weir 8 278.54 cfs 22107 2992.00 cfs 22139 1149.90 cfs 22149 1152.59 cfs 22150 1 153.00 cfs 22170 1204.42 cfs 22188 1313.74 cfs 22222 1313.74 cfs 22295 1753.55 cfs . 22371 2244.64 cfs ---........... . .- 22434 2539>Q0 cfs X . . ~ . 22451 2713.46---ds ~ : 22485 2992.00 cfs' . ALL FLOW RETURNS AT SECT 2167.-r X ~Iow .can follow ditch resulting '~ spills and shallow flooding. D,tch flow not studied. Ditch Conveyance ignored far HEC-2 analysis. 1 + r------------- + ---~---------j-+~ ~bbl~g~~U<(;rH~ID~~1IN~6c~O~Rl~kO C~N~[RUCTURAL 1 DAAFT~ + .500-year over . Coaltan Road swift ~nd deep but isconnected from ain channel flow. Low chord elevation = 5481.96 Upstream invert = 5473.96 Downstream invert = 5473.46 ------- X . ------ Map base on 1 "=200' topog h' . December. 1994. Adjustmen't~p ~~d~agpl~ pr~ared. by ~H2MHiII ~rom photographs token McLoughlin Water Engineers. Inc.. for slrucfJlr~~ toEnt?~nt~lr\:S~~~I~t~~'9~~c. per drawings by r~~g~iO~: A~~wb<tsne~n~~ri~ c~o~ed level. loop beginning .and ending on USGS Be ch Mark l-R Vertical -oatum. C80rdinat~s ~re S~6d11i~J1's~~le p1~env~tlf~~8~asea on the 1988/1993 Nationa?B X ~ ~ TAGGART f~' ENGINEERING ASSOCIATES,INC. ~2480'I/.26THAVE.SUITEJ40B De_.Colorodo80211 (JOJ)4~-J600FAX4~-9929 DRAWN BY: DR FLOOD INSURANCE STUDY WORK MAP ROCK CREEK BENCHMARK DESCRIPTIONS NAME ELEVATION 100/56B 5460.06 1988/93 NAVD OR 5456.80 1929 NGVD 100/61A 5523.66 1988/93 NAVD OR 5520.40 1929 NGVD USGS TP 5529.09 1988/93 NAVD OR 5525.83 1929 NGVD DESCRIPTION g~I~~~E~N S~~~~E LII~ECONC. ON THE N, SIDE OF THE COMMUITY DITCH ON THE E SIDE ~8~~R~HIJ~Lt.D~fg~A~F +~:~J:~~~~T P~iN~F JL~~~T~N A~frTLMS~~f g~UJ~C~F C~~~~H BOX ~~g~s~~~NBt~~~E~~RriH~L~~A~?~~El~8C: D~~~MINJ~:;,~~TION OF COAL TON RD. AND ~ 200 0 200 ~ I Scale 1" CONTOUR INTERVAL 2 FT I 200 ft 600 I SHEET NO. 12 27 96 SHEET LAYOUT 2 CHECKED BY: DATE: TEA PROJ. NO. 40 WCT DMP' ~8J~J08\NI V~\OVJV\~J08\ VHJOv\ :,j