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HomeMy WebLinkAboutSWP272961 --,(OF RENTI 10/15/02 'ECEIVO NOV ...ASA SERV LIBERTY RIDGE,PHASE VI/ VII—PIPE SIZING CALCULATIONS See "Pipe Sizing Exhibit, Phase VI and VIT' at the end of this section as an aid to the following discussion. The storm conveyance for Liberty Ridge, Phase VI and VII is divided into two hydrologic basins that are almost the same size. The northern basin, called "Model 3" in this analysis, is 9.17 acres and directs flow to an existing 18-inch stub from CB 424 in Phase IVB a few catch basins upstream of Pond C between lots 225 and 226. The backwater modeling for this basin began at existing CB 402 in Phase 111, the tailwater in this CB for the 100-year event was the starting freewater surface for the analysis ( see `Backwater Calculations, Phase III, 100 yr Event" at the end of this section ). The southern basin is called "Model 4" and flows to an existing 18-inch stub from CB 415 also in Phase IVB. The backwater modeling for this basin began at existing CB 413 in Phase 111, the tailwater in this CB for the 100-year event was the starting freewater surface for the analysis ( see "Backwater Calculations, Phase III, 100 yr Event"at the end of this section) . The storm runoff calculated at each catch basin junction was determined using the King County Modified Rational Method applied to the entire basin and then divided up into catchments using the measured areas of the basins.These measured areas were used,as Q-ratios, to determine the appropriate runoff(see "Q-ratio Calculations"at the end of this section). The amount of 100- year flow and the tailwater elevations used for each of the models is summarized in the following table.The resultant backwater output is also included with this report. Flow (cfs) Tailwater CB ID,Hyd. Model Q-100 Elevation Model 3 11.27 255.03 CB 402, PH3-1 Model 4 13.38 263.34 CB 413, PH3-1 Summary of Backwater Modeling Parameters Using the above referenced flows and tailwater elevations the pipe system was sized using the King County Backwater program. The out put for the pipe conveyance models are included at the Page 1 of 2 10/15/02 end of this summary (see "Model 3, Backwater Analysis" and "Model 4, Backwater Analysis" for the detailed output from the KCBW program. Per the King County Standard for Pipe Conveyance sizing (Core Requirement #4, Page 1.2.4-1)all flow for the 100-year event is contained within the pipe system. -James A.Morin,PE Page 2 of 2 _ I TRIAD ASSOCIATES Project Yeva`emmt P^G •••-, •. •. ,,a r p '� y( !(� Imd Sucre Lud Ua<%a0ein6 - - L.odacepe AreNlecture S t<Omlry ueu 1150 ti. .nvwT E,.sbJi v'tl o Td 125811.NIB ra�zs audet CB 424 Tell OM .�. AREA, IN A CRES TY y � TIME- OF CONCEN TRA TI ON FLOW INJECTION POINT Q)9. 17 & A SLOPETRA /EL PATH, � < f�► Ak�� \602 WITH CB NUMBER (TYP.) (TYP.) m ��' 51 O _ � C xr 601 _ } ♦ - _ - . loo ♦ `= _ __.._.________ 5� loo s, 0000 . Ft - - 50 r 0 0 703 _ Y J c i 18 O 50 y O 45 � ...._ O . .. 701 _ - 25'-C :a ��s 0.53 � 037 cc _ Lu4 W SO4 ♦� i _ 70 1 33 4 o L.. _ - ,; ,� , �� ,. 7020.51 0. 12 J0.23 - W MODEL:PH3-1 so3 ; sos�,. = 715~ s 0. 1® 0. 18 j = .35 =72s CB 402 _ - _ 0.3 ,,� _ o 0.32 "'0.22 TW=255.03 .. sag 1 l.tllar2,,, ,, _ _ - - 1727 605 (100— YEAR) - - - ) 22 - - 0.52 = = D. 726 0.84 - 0.55 'S 0. 16 725 wool.�1 12 (��fp ` _ Y V r 07 65 _ @l r w s y _ = y 713714 Os � Y " .. � 4 f i m f r �' � � �� a.� X", "`t; ` ,cr1i �.,'i s � ��^t �w-.� ,�'- � "`,4 I q �x _ 0:��64 t v, O.354 - :,3 TW=-2-6 Y : 0.22 0. 15 } ;,• � � `� ,; + - 710X�, Jfi F 1 P®orEcr soeTETos FROWT 9iGDM J 1 O 5 PB9J&I IaNDSCdP6 eixmTecr .r/IJf `� L,Y� Vzt� 1 ..v - -^.-YQ t'*'e ++ .aco.nu.R®'/i"'K•^"` .F r`L DAM scaL aor2: ver_ v \\-,�o: �t •,\, f- f!��;v �' ,�'r.�--",---�"'�`r�--~'-....,f.—.•-...-�--'--,6tfi-j- --", t� '� - Y � r.t Y t 0.30 5 t 0.84 ==h 8.60 rfv _ z t `e o i -- t - CA TCHMENT. BOUNDARY TYP. MODEL NAME TYP t srAW NOT VAM s BNtFSS SIGNED AND BeTBB JOB NUMBER 'I xf 00-022 SHEET NUMBER 1 7DF ©2000 TRIAD ASS00ATES Q-ratio Calculations MODEL 3 Total Contributing Upstream Q-ratio Desc. Area (AC) Area 1.33 0.00 0.00 CB 709 0.37 1.70 0.22 CB 708 0.65 2.07 0.31 CB 706 + 707 0.55 2.72 0.20 CB 704 + 705 0.50 3.27 0.15 CB 703 0.69 3.77 0.18 CB 701 + 702 0.77 4.46 0.17 CB 608 + 609 1.78 5.23 0.34 CB 606 + 607 0.62 7.01 0.09 CB 603 + 604 1.04 7.63 0.14 CB 601 + 602 0.90 8.67 0.10 CB 405 9.17 Page 1 of 2 0-ratio Calculations Q-ratio Calculations MODEL 4 0.32 0.00 0.00 CB 728 0.35 0.67 0.52 CB 727 1.06 1.41 0.75 CB 725 + 726 0.64 1.70 0.38 CB 724 0.40 1.04 0.38 CB 722 + 723 1.43 1.83 0.78 CB 719 + 720 + 721 0.36 1.79 0.20 CB 717 + 718 1.83 2.19 0.84 CB712 -> 716 0.35 2.18 0.16 CB 710 0.99 1.34 0.74 CB 615 + 616 0.57 1.56 0.37 CB 612 + 614 0.30 0.87 0.34 CB 415 8.60 Page 2 of 2 0-ratio Calculations Basin Flows Based on K.C. Modified Rational Method Model 3: Q=CA(Pr*lr) Ir= a(Tc)^b Design Flow(25 and 100 year): a=2.66 (25-year)2.61 (100-year); b=-0.65 (25-year)-0.63 (100-year) A C Pr Ir Q 9.17 0.565 3.00 0.541 8.41 25 year 9.17 0.565 3.90 0.558 11.27 100 year Basin Time of Concentration: Time (min) = (DistanceNelocity)60 V= Kr(Slope)^0.5 Distance Slope Kr Velocity Travel Time Tc 250 1.00 10.10 1.01 4.13 4.13 425 2.00 20.00 2.83 2.50 6.63 600 3.00 20.00 3.46 2.89 9.52 350 2.00 20.00 2.83 2.06 11.58 <-Basin Tc Model 4: Q=CA(Pr*lr) Ir = a(Tc)^b Design Flow(25 and 100 year): a=2.66 (25-year)2.61 (100-year); b=-0.65 (25-year)-0.63 (100-year) A C Pr Ir Q 8.6 0.565 3.00 0.690 10.06 25 year 8.6 0.565 3.90 0.706 13.38 100 year Basin Time of Concentration: Time (min) = (DistanceNelocity)60 V= Kr(Slope)AO.5 Distance Slope Kr Velocity Travel Time Tc 260 1.50 10.10 1.24 3.50 3.50 460 3.00 20.00 3.46 2.21 5.72 270 1.00 20.00 2.00 2.25 7.97 <-Basin Tc Page 1 of 1 Flows Based on K.C. Modified Rational Method Backwater Calculations,Phase III, 100-yr Event BACKWATER COMPUTER PROGRAM FOR PIPES Pipe data from file:PH3-l.bwp Surcharge condition at intermediate junctions Tailwater Elevation:251. feet Discharge Range:19.1 to 19.1 Step of 1. [cfs] Overflow Elevation:281.18 feet Weir:NONE Upstream Velocity:0. feet/sec PIPE NO. 1: 154 LF - 3611CP @ 1.68% OUTLET: 246.60 INLET: 249.18 INTYP: 5 JUNC NO. 1: OVERFLOW-EL: 261.30 BEND: 0 DEG DIA/WIDTH: 6.0 Q-RATIO: 0.00 Q(CFS) HW(FT) HW ELEV. * N-FAC DC DN TW DO DE HWO HWI ******************************************************************************* 19.10 2 .14 251.32 * 0.012 1.41 0.92 4 .40 4.40 1.83 2 .14 1.88 CB 402 PIPE NO. 2: 49 LF - 3611CP @ 1.00% OUTLET: 252.63 INLET: 253 .12 INTYP: 5 JUNC NO. 2: OVERFLOW-EL: 259.47 BEND: 45 DEG DIA/WIDTH: 6.0 Q-RATIO: 0.42 Q(CFS) HW(FT) HW ELEV. * N-FAC DC DN TW DO DE HWO HWI ******************************************************************************* 19 .10 1.91 255.03 * 0.012 1.41 1.06 0 .00 1.06 1.41 ***** 1. 91 PIPE NO. 3 : 62 LF - 2411CP @ 2 .00% OUTLET: 254 .12 INLET: 255.36 INTYP: 5 JUNC NO. 3 : OVERFLOW-EL: 260.13 BEND: 90 DEG DIA/WIDTH: 2 .5 Q-RATIO: 0.00 Q(CFS) HW(FT) HW ELEV. * N-FAC DC DN TW DO DE HWO HWI ******************************************************************************* 13 .45 2 .15 257.51 * 0.012 1.33 0 .87 0.91 0.91 1.33 ***** 2.15 PIPE NO. 4 : 64 LF - 2411CP @ 2 .00% OUTLET: 255.36 INLET: 256.64 INTYP: 5 JUNC NO. 4 : OVERFLOW-EL: 261.74 BEND: 10 DEG DIA/WIDTH: 2.0 Q-RATIO: 0.01 Q(CFS) HW(FT) HW ELEV. * N-FAC DC DN TW DO DE HWO HWI ******************************************************************************* 13 .45 1.80 258 .44 * 0.012 1.33 0.87 2 .15 2 .15 1.33 ***** 1. 80 PIPE NO. 5: 204 LF - 24"CP @ 1.03% OUTLET: 256.64 INLET: 258.74 INTYP: 4 JUNC NO. 5 : OVERFLOW-EL: 265.96 BEND: 0 DEG DIA/WIDTH: 2.0 Q-RATIO: 0.05 Q(CFS) HW(FT) HW ELEV. * N-FAC DC DN TW DO DE HWO HWI ******************************************************************************* 13 .32 1.32 260.06 * 0.012 1.32 1.05 1.80 1.80 1.32 ***** 1.21 CB 413 PIPE NO. 6: 181 LF - 1811CP @ 0.50% OUTLET: 259.24 INLET: 260.15 INTYP: 5 JUNC NO. 6: OVERFLOW-EL: 264.03 BEND: 0 DEG DIA/WIDTH: 3.0 Q-RATIO: 0.06 Q(CFS) HW(FT) HW ELEV. * N-FAC DC DN TW DO DE HWO HWI ******************************************************************************* 12.68 3.19 263.34 * 0.012 1.35 1.50 0.82 1.35 2.65 3.19 2.39 Backwater Calculations, Phase III, 100-yr Event Pagel of 1 Model 3, Backwater Analysis BACKWATER COMPUTER PROGRAM FOR PIPES Pipe data from file:MODEL3 .bwp Surcharge condition at intermediate junctions Tailwater Elevation:255.03 feet Discharge Range:8.41 to 11.27 Step of 2.87 [cfs] Overflow Elevation:294 .5 feet Weir:NONE Upstream Velocity:0. feet/sec CB 402 PIPE NO. 1: 104 LF - 1811CP @ 0.50% OUTLET: 254.62 INLET: 255.14 INTYP: 5 JUNC NO. 1: OVERFLOW-EL: 259.00 BEND: 15 DEG DIA/WIDTH: 3 .0 Q-RATIO: 0.00 Q(CFS) HW(FT) HW ELEV. * N-FAC DC DN TW DO DE HWO HWI ******************************************************************************* 8.41 1.60 256.74 * 0.012 1.13 1.31 0.41 1.13 1.31 1.60 1.57 11.28 2 .25 257.39 * 0.012 1.29 1.50 0.41 1.29 1.88 2.25 2.04 CB 404 PIPE NO. 2 : 94 LF - 1811CP @ 0.50% OUTLET: 255.14 INLET: 255.61 INTYP: 5 JUNC NO. 2 : OVERFLOW-EL: 259.39 BEND: 45 DEG DIA/WIDTH: 3.0 Q-RATIO: 0.10 Q(CFS) HW(FT) HW ELEV. * N-FAC DC DN TW DO DE HWO HWI ******************************************************************************* 8 .41 2.02 257.63 * 0.012 1.13 1.31 1.60 1.60 1.64 2.02 1.74 11.28 3 .37 258.98 * 0.012 1.29 1.50 2 .25 2 .25 2 .70 3.37 2 .35 CB 422 PIPE NO. 3 : 43 LF - 1811CP @ 0.77% OUTLET: 255.61 INLET: 255.94 INTYP: 5 JUNC NO. 3 : OVERFLOW-EL: 261.00 BEND: 10 DEG DIA/WIDTH: 3 .0 Q-RATIO: 0.00 Q(CFS) HW(FT) HW ELEV. * N-FAC DC DN TW DO DE HWO HWI ******************************************************************************* 7 .65 2 .05 257.99 * 0.012 1.08 0.99 2 .02 2 .02 1.89 2 .05 1.47 10.25 3 .68 259.62 * 0. 012 1.24 1.28 3 .37 3 .37 3 .39 3 .68 1.84 CB 424 PIPE NO. 4 : 35 LF - 1811CP @ 0.74% OUTLET: 255.94 INLET: 256.20 INTYP: 5 JUNC NO. 4 : OVERFLOW-EL: 261.00 BEND: 10 DEG DIA/WIDTH: 3 .0 Q-RATIO: 0.00 Q(CFS) HW(FT) HW ELEV. * N-FAC DC DN TW DO DE HWO HWI ******************************************************************************* 7 .65 2.11 258.31 * 0.012 1.08 1.00 2 .05 2 .05 1.95 2.11 1.47 10.25 3 .99 260.19 * 0.012 1.24 1.31 3 .68 3 .68 3 .71 3.99 1.84 CB 601 PIPE NO. 5 : 115 LF - 18"CP @ 1.89% OUTLET: 256.20 INLET: 258.37 INTYP: 5 JUNC NO. 5: OVERFLOW-EL: 262 .99 BEND: 90 DEG DIA/WIDTH: 3 .0 Q-RATIO: 0.14 Q(CFS) HW(FT) HW ELEV. * N-FAC DC DN TW DO DE HWO HWI ******************************************************************************* 7 .65 1.83 260.20 * 0. 012 1.08 0.75 2 .11 2 .11 1.08 ***** 1.83 10.25 3 .72 262 .09 * 0.012 1.24 0. 89 3 . 99 3 .99 2 .76 3 .72 2 .50 Page 1 of 3 Model 3, Backwater Analysis Model 3,Backwater Analysis CB 603 PIPE NO. 6: 175 LF - 18"CP @ 2.06% OUTLET: 258 .37 INLET: 261.97 INTYP: 5 JUNC NO. 6: OVERFLOW-EL: 266.47 BEND: 0 DEG DIA/WIDTH: 3 .0 Q-RATIO: 0.09 Q(CFS) HW(FT) HW ELEV. * N-FAC DC DN TW DO DE HWO HWI ******************************************************************************* 6.71 1.40 263 .37 * 0.012 1.01 0.67 1.83 1.83 1.01 ***** 1.40 9.00 1.71 263.68 * 0.012 1. 17 0.80 3.72 3 .72 1.17 ***** 1.71 CB 605 PIPE NO. 7 : 86 LF - 18"CP @ 1.00% OUTLET: 261.97 INLET: 262.83 INTYP: 5 JUNC NO. 7 : OVERFLOW-EL: 267.63 BEND: 0 DEG DIA/WIDTH: 3 .0 Q-RATIO: 0.34 Q(CFS) HW(FT) HW ELEV. * N-FAC DC DN TW DO DE HWO HWI ******************************************************************************* 6.15 1.41 264.24 * 0.012 0.96 0.79 1.40 1.40 0.96 ***** 1.41 8.25 1.75 264.58 * 0.012 1.12 0.95 1.71 1.71 1.20 1.75 1.72 CB 608 PIPE NO. 8: 56 LF - 18"CP @ 0.50% OUTLET: 262 .83 INLET: 263.11 INTYP: 5 JUNC NO. 8: OVERFLOW-EL: 267.15 BEND: 90 DEG DIA/WIDTH: 3 .0 Q-RATIO: 0.17 Q(CFS) HW(FT) HW ELEV. * N-FAC DC DN TW DO DE HWO HWI ******************************************************************************* 4.59 1.58 264 .69 * 0.012 0.83 0.82 1.41 1.41 1.18 1.58 1.39 6.16 2.24 265.35 * 0.012 0.96 0.99 1.75 1.75 1.64 2.24 1.80 CB 701 PIPE NO. 9: 178 LF - 12"CP @ 3 .00% OUTLET: 263 .61 INLET: 268.95 INTYP: 5 JUNC NO. 9: OVERFLOW-EL: 273 .07 BEND: 5 DEG DIA/WIDTH: 3 .0 Q-RATIO: 0.18 Q(CFS) HW(FT) HW ELEV. * N-FAC DC DN TW DO DE HWO HWI ******************************************************************************* 3 .92 1.42 270.37 * 0.012 0.85 0.56 1.08 1.08 0.85 ***** 1.42 5.26 2.03 270.98 * 0.012 0.93 0.67 1.74 1.74 0.93 ***** 2 .03 CB 703 PIPE NO.10 : 114 LF - 1211CP @ 4 .43% OUTLET: 268 .95 INLET: 274.00 INTYP: 5 JUNC NO. 10: OVERFLOW-EL: 277.50 BEND: 5 DEG DIA/WIDTH: 3 .0 Q-RATIO: 0.15 Q(CFS) HW(FT) HW ELEV. * N-FAC DC DN TW DO DE HWO HWI ******************************************************************************* 3 .33 1. 18 275 .18 * 0.012 0.79 0.45 1.42 1.42 0.79 ***** 1.18 4 .46 1.61 275.61 * 0.012 0.89 0.53 2.03 2. 03 0.89 ***** 1.61 CB 704 PIPE NO.11: 169 LF - 12"CP @ 3 .50% OUTLET: 274 .00 INLET: 279.91 INTYP: 5 JUNC NO. 11 : OVERFLOW-EL: 284.03 BEND: 2 DEG DIA/WIDTH: 3 . 0 Q-RATIO: 0.20 Q(CFS) HW(FT) HW ELEV. * N-FAC DC DN TW DO DE HWO HWI ******************************************************************************* 2 . 89 1. 07 280.98 * 0. 012 0.73 0.45 1.18 1. 18 0.73 ***** 1.07 3 . 88 1.41 281.32 * 0.012 0.84 0.53 1.61 1.61 0.84 ***** 1.41 Page 2 of 3 Model 3, Backwater Analysis Model 3, Backwater Analysis CB 706 PIPE NO.12 : 190 LF - 12"CP @ 2 .67% OUTLET: 279.91 INLET: 284.99 INTYP: 5 JUNC NO.12 : OVERFLOW-EL: 288.99 BEND: 0 DEG DIA/WIDTH: 3 . 0 Q-RATIO: 0.31 Q(CFS) HW(FT) HW ELEV. * N-FAC DC DN TW DO DE HWO HWI ******************************************************************************* 2 .41 0.97 285.96 * 0.012 0.67 0.43 1.07 1.07 0.67 ***** 0.97 3 .23 1.22 286.20 * 0.012 0.78 0.51 1.41 1.41 0.78 ***** 1.22 CB 708 PIPE NO.13 : 195 LF - 12"CP @ 1.80% OUTLET: 284 .99 INLET: 288.50 INTYP: 5 JUNC NO.13 : OVERFLOW-EL: 291.98 BEND: 0 DEG DIA/WIDTH: 3. 0 Q-RATIO: 0.22 Q(CFS) HW(FT) HW ELEV. * N-FAC DC DN TW DO DE HWO HWI ******************************************************************************* 1.84 0.81 289.31 * 0.012 0.58 0.42 0.97 0.97 0.58 ***** 0.81 2 .47 0.98 289.48 * 0.012 0.68 0.49 1.22 1.22 0.68 ***** 0.98 CB 709 PIPE NO.14 : 139 LF - 1211CP @ 3 .24% OUTLET: 288.50 INLET: 293.00 INTYP: 5 Q(CFS) HW(FT) HW ELEV. * N-FAC DC DN TW DO DE HWO HWI ******************************************************************************* 1.51 0.76 291.76 * 0.012 0.53 0.37 0.81 0.81 0.53 ***** 0.76 2 .02 0.92 291.92 * 0.012 0.61 0.44 0.98 0.98 0.61 ***** 0.92 Page 3 of 3 Model 3, Backwater Analysis Model 4, Backwater Analysis BACKWATER COMPUTER PROGRAM FOR PIPES Pipe data from file:model4 .bwp Surcharge condition at intermediate junctions Tailwater Elevation:263 .34 feet Discharge Range:10.06 to 13 .38 Step of 3 .32 [cfs) Overflow Elevation:290.46 feet Weir:NONE Upstream Velocity:0. feet/sec CB 415 PIPE NO. 1: 56 LF - 1811CP @ 1.00% OUTLET: 261.60 INLET: 262 .16 INTYP: 5 JUNC NO. 1: OVERFLOW-EL: 2,66.74 BEND: 5 DEG DIA/WIDTH: 3 .0 Q-RATIO: 0.34 Q(CFS) HW(FT) HW ELEV. * N-FAC DC DN TW DO DE HWO HWI ******************************************************************************* 10.06 2.06 264 .22 * 0.012 1.23 0.92 2.33 2.33 1.72 2 .06 1.86 13.38 2.73 264 .89 * 0.012 1.37 1.13 2.33 2 .33 2.13 2 .73 2 .53 CB 615 PIPE NO. 2 : 144 LF - 15"CP @ 3 .60% OUTLET: 262.41 INLET: 267.60 INTYP: 5 JUNC NO. 2 : OVERFLOW-EL: 271.56 BEND: 5 DEG DIA/WIDTH: 3.0 Q-RATIO: 0.37 Q(CFS) HW(FT) HW ELEV. * N-FAC DC DN TW DO DE HWO HWI ******************************************************************************* 7.51 2.09 269.69 * 0. 012 1.09 0.68 1.81 1.81 1.09 ***** 2.09 9.99 3.06 270.66 * 0.012 1.19 0.81 2 .48 2 .48 1.19 ***** 3 .06 CB 710 PIPE NO. 3 : 99 LF - 15"CP @ 3 .50% OUTLET: 267.60 INLET: 271.06 INTYP: 5 JUNC NO. 3 : OVERFLOW-EL: 275.22 BEND: 2 DEG DIA/WIDTH: 3 .0 Q-RATIO: 0.74 Q(CFS) HW(FT) HW ELEV. * N-FAC DC DN TW DO DE HWO HWI ******************************************************************************* 5.48 1.55 272 .61 * 0.012 0.95 0.57 2 .09 2.09 0.95 ***** 1.55 7.29 2.12 273.18 * 0.012 1.08 0.67 3 .06 3 .06 1.08 ***** 2 .12 CB 711 PIPE NO. 4: 127 LF - 1511CP @ 3.30% OUTLET: 271.06 INLET: 275.25 INTYP: 5 JUNC NO. 4: OVERFLOW-EL: 280.05 BEND: 3 DEG DIA/WIDTH: 3 .0 Q-RATIO: 0.16 Q(CFS) HW(FT) HW ELEV. * N-FAC DC DN TW DO DE HWO HWI ******************************************************************************* 3. 15 0.89 276.40 * 0.012 0.72 0.42 1.55 1.55 0.72 ***** 0.89 4 .19 1.01 276.52 * 0.012 0.83 0.49 2 .12 2.12 0.83 ***** 1.01 CB 717 PIPE NO. 5 : 117 LF - 1211CP @ 1.57% OUTLET: 275.50 INLET: 277.34 INTYP: 5 JUNC NO. 5: OVERFLOW-EL: 283.24 BEND: 2 DEG DIA/WIDTH: 4.0 Q-RATIO: 0. 84 Q(CFS) HW(FT) HW ELEV. * N-FAC DC DN TW DO DE HWO HWI ******************************************************************************* 2.71 1.11 278.88 * 0 .012 0.71 0.53 0.64 0.64 0.71 ***** 1. 11 3 . 61 1.46 279.23 * 0.012 0. 82 0.63 0.76 0.76 0.82 ***** 1.46 Page I of 3 Model 4, Backwater Analysis Model 4, Backwater Analysis CB 718 PIPE NO. 6: 30 LF - 12"CP @ 4.67% OUTLET: 277.34 INLET: 278.74 INTYP: 5 JUNC NO. 6: OVERFLOW-EL: 283 .24 BEND: 90 DEG DIA/WIDTH: 3 .0 Q-RATIO: 0.00 Q(CFS) HW(FT) HW ELEV. * N-FAC DC DN TW DO DE HWO HWI ******************************************************************************* 1.48 0.76 279.45 * 0.012 0.52 0.32 1.11 1.11 0.52 ***** 0.76 1.96 0.92 279.61 * 0.012 0.60 0.37 1.46 1.46 0.60 ***** 0.92 CB 719 PIPE NO. 7: 94 LF - 12"CP @ 1.86% OUTLET: 278.74 INLET: 280.49 INTYP: 5 JUNC NO. 7: OVERFLOW-EL: 285.09 BEND: 90 DEG DIA/WIDTH: 3 .0 Q-RATIO: 0.20 Q(CFS) HW(FT) HW ELEV. * N-FAC DC DN TW DO DE HWO HWI ******************************************************************************* 1.48 0.76 281.25 * 0.012 0.52 0.36 0.76 0.76 0.52 ***** 0.76 1.96 0.93 281.42 * 0.012 0.60 0.42 0.92 0.92 0.60 ***** 0.93 CB 722 PIPE NO. 8: 107 LF - 1211CP @ 1.80% OUTLET: 280.49 INLET: 282 .42 INTYP: 5 JUNC NO. 8 : OVERFLOW-EL: 286.69 BEND: 2 DEG DIA/WIDTH: 3.0 Q-RATIO: 0.78 Q(CFS) HW(FT) HW ELEV. * N-FAC DC DN TW DO DE HWO HWI ******************************************************************************* 1.23 0.66 283 .54 * 0.012 0.47 0.32 0.76 0.76 0.47 ***** 0.66 1.64 0.78 283 .66 * 0.012 0.55 0.37 0.93 0.93 0.55 ***** 0.78 CB 724 PIPE NO. 9: 71 LF - 12"CP @ 1.80% OUTLET: 282.42 INLET: 283 .70 INTYP: 5 JUNC NO. 9: OVERFLOW-EL: 287.72 BEND: 10 DEG DIA/WIDTH: 3 .0 Q-RATIO: 0.38 Q(CFS) HW(FT) HW ELEV. * N-FAC DC DN TW DO DE HWO HWI ******************************************************************************* 0.69 0.47 284.17 * 0.012 0.35 0.28 0.66 0.66 0.35 ***** 0.47 0.92 0.55 284 .25 * 0. 012 0.41 0.32 0.78 0.78 0.41 ***** 0.55 CB 725 PIPE NO.10: 69 LF - 12"CP @ 1.14% OUTLET: 283 .70 INLET: 284 .49 INTYP: 5 JUNC NO.10: OVERFLOW-EL: 288.61 BEND: 10 DEG DIA/WIDTH: 3 .0 Q-RATIO: 0.75 Q(CFS) HW(FT) HW ELEV. * N-FAC DC DN TW DO DE HWO HWI. ******************************************************************************* 0.50 0.40 284.89 * 0.012 0.30 0.24 0.47 0.47 0.30 ***** 0.40 0.67 0.46 284 .95 * 0.012 0.35 0.28 0.55 0.55 0.35 ***** 0.46 CB 727 PIPE NO.11: 112 LF - 1211CP @ 1.60% OUTLET: 284 .49 INLET: 286.28 INTYP: 5 JUNC NO. 11: OVERFLOW-EL: 290.22 BEND: 10 DEG DIA/WIDTH: 3 .0 Q-RATIO: 0.52 Q(CFS) HW(FT) HW ELEV. * N-FAC DC DN TW DO DE HWO HWI ******************************************************************************* 0.29 0.29 286.58 * 0.012 0 .23 , 0. 17 0.40 0.40 0.23 ***** 0.29 0.38 0.33 286.62 * 0.012 0 .26 0.19 0.46 0.46 0.26 ***** 0.33 Page 2 of 3 Model 4, Backwater Analysis Model 4, Backwater Analysis CB 728 PIPE NO.12: 34 LF - 8"CP @ 2.00% OUTLET: 286.61 INLET: 287.29 INTYP: 5 Q(CFS) HW(FT) HW ELEV. * N-FAC DC DN TW DO DE HWO HWI ******************************************************************************* 0.19 0.27 287.56 * 0.012 0.20 0.15 0.00 0.15 0.20 ***** 0.27 0.25 0.31 287.60 * 0.012 0.24 0.17 0.01 0.17 0.24 ***** 0.31 Page 3 of 3 Model 4, Backwater Analysis 10/15/02 LIBERTY RIDGE,PHASE VI/VII—PIPE SIZING CALCULATIONS See "Pipe Sizing Exhibit, Phase VI and VIP' at the end of this section as an aid to the following discussion. The storm conveyance for Liberty Ridge, Phase VI and VII is divided into two hydrologic basins that are almost the same size. The northern basin, called "Model 3" in this analysis, is 9.17 acres and directs flow to an existing 18-inch stub from CB 424 in Phase IVB a few catch basins upstream of Pond C between lots 225 and 226. The backwater modeling for this basin began at existing CB 402 in Phase III, the tailwater in this CB for the 100-year event was the starting freewater surface for the analysis ( see `Backwater Calculations, Phase III, 100 yr Event" at the end of this section ). The southern basin is called "Model 4" and flows to an existing 18-inch stub from CB 415 also in Phase IVB. The backwater modeling for this basin began at existing CB 413 in Phase 111, the tailwater in this CB for the 100-year event was the starting freewater surface for the analysis ( see "Backwater Calculations, Phase III, 100 yr Event"at the end of this section) . The storm runoff calculated at each catch basin junction was determined using the King County Modified Rational Method applied to the entire basin and then divided up into catchments using the measured areas of the basins. These measured areas were used, as Q-ratios, to determine the appropriate runoff(see "Q-ratio Calculations"at the end of this section). The amount of 100- year flow and the tailwater elevations used for each of the models is summarized in the following table.The resultant backwater output is also included with this report. Flow (cfs) Tailwater CB ID, Hyd. Model Q-100 (Elevation) Model 3 11.27 255.03 CB 402, PH3-1 Model 4 13.38 263.34 CB 413, PH3-1 Summary of Backwater Modeling Parameters Using the above referenced flows and tailwater elevations the pipe system was sized using the King County Backwater program. The out put for the pipe conveyance models are included at the Page 1 of 2 10/15/02 end of this summary (see "Model 3, Backwater Analysis" and "Model 4, Backwater Analysis" for the detailed output from the KCBW program. Per the King County Standard for Pipe Conveyance sizing (Core Requirement #4, Page 1.2.4-1)all flow for the 100-year event is contained within the pipe system. -James A.Morin,PE Page 2 of 2 r r;,'� l Pralecl Yena`ement TRIAD ASSOCIATES CiN Ehcineerwl I-d Surn,i g - i lud U.Pk...g I.nd,npe ArcLilect�re Silo Dmp 11614 116N k. IC Zdlud it6B6Sd-6629 Td/25821 N18 is 4MA21301 Ton r.ee 610A�6 .�. . rx r� AREA, IN A CRES I ? (TYP.) y x , .- SCALE 1" = 60' 3 rLw �♦ n TIME-OF OF CONCENTRATION ® 9. 17 _ p ` FLOW INJECTION POINT TRAVEL PATH, SLOPE • ca fir\so2.___._ WI 1 H CB NUMBER (T YP.) (TYP.) - 1 ` ;; r t 6015 too C9 5 f; a = 0.0 @ �♦ W -' - > I _ cc - 55 Y Lw ♦r y 18` 0 50 ,3 7 - - .r 0 45 0.53 ' QL y f 703 ' 4 r /�oy -" sr 0. 701 .,� � .�,Yra� 7 L.`F1'/0`708 __ ._ _....._....,7©g`' I``- IyJ O O 37 _ �' � 0.30 �' 71� 4��ara ��aa.�•�� r•�� o �►�-. n'''"'all: 1.t I — =- �705 _-_ 4,Q¢ � _ .3r 7025 0. 18MODEL. PH 3— so3 sos . . . 1 728l 0.35 715 6cc CB 402 0.32 = 727 0.32Tw-2J5.D3 609(100— EAR) ;. a v W - _ = 0.52 0. U =, 2272,E 1 _ _ _ 0.84 10,0 I. 2 0 48 .0.55 , j 725 s l ^ x/ � I'1 VVV _, ' ss 71 714 '�y _ "'r'_ 11 7 f 3 4- r- - t 11 ry - y� P o .24 ' Ca ;� 1 ' sit = X�!�' ' Tw i � y �.,� t `} t' t.� If;;�.`l i,.-"` .2� % •t, t x 1 f PRWECI'YAIUGSB s\` � 0.22 '� 0. 15 f 710 r rawecr soevgroe 1 1 40 > t 2 - `t q -a75 U nwers escw" v. SCAM eon4 vet: ;. A0.30 5 860 ' r 0.84 F CA TCHMEN T BOUNDARY (TY MODEL NAME i stets trot vex i l �SIGNED AND nett ion M01� 00-022 7oP 1 02D00 TRIAD ASS00ATE5 steer zUN= 0-ratio Calculations MODEL 3 Total Contributing Upstream Q-ratio Desc. Area (AC) Area 1.33 0.00 0.00 CB 709 0.37 1.70 0.22 CB 708 0.65 2.07 0.31 CB 706 + 707 0.55 2.72 0.20 CB 704 + 705 0.50 3.27 0.15 CB 703 0.69 3.77 0.18 CB 701 + 702 0.77 4.46 0.17 CB 608 + 609 1.78 5.23 0.34 CB 606 + 607 0.62 7.01 0.09 CB 603 + 604 1.04 7.63 0.14 CB 601 + 602 0.90 8.67 0.10 CB 405 9.17 Page 1 of 2 0-ratio Calculations Q-ratio Calculations MODEL 4 0.32 0.00 0.00 CB 728 0.35 0.67 0.52 CB 727 1.06 1.41 0.75 CB 725 + 726 0.64 1.70 0.38 CB 724 0.40 1.04 0.38 CB 722 + 723 1.43 1.83 0.78 CB 719 + 720 + 721 0.36 1.79 0.20 CB 717 + 718 1.83 2.19 0.84 CB712 -> 716 0.35 2.18 0.16 CB 710 0.99 1.34 0.74 CB 615 + 616 0.57 1.56 0.37 CB 612 + 614 0.30 0.87 0.34 CB 415 8.60 Page 2 of 2 0-ratio Calculations Basin Flows Based on K.C. Modified Rational Method Model 3: Q=CA(Pr*lr) Ir = a(Tc)^b Design Flow (25 and 100 year): a=2.66 (25-year)2.61 (100-year); b=-0.65 (25-year) -0.63 (100-year) A C Pr Ir Q 9.17 0.565 3.00 0.541 8.41 25 year 9.17 0.565 3.90 0.558 11.27 100 year Basin Time of Concentration: Time (min) = (DistanceNelocity)60 V= Kr(Slope)AO.5 Distance Slope Kr Velocity Travel Time Tc 250 1.00 10.10 1.01 4.13 4.13 425 2.00 20.00 2.83 2.50 6.63 600 3.00 20.00 3.46 2.89 9.52 350 2.00 20.00 2.83 2.06 11.58 <-Basin Tc Model 4: Q=CA(Pr*lr) Ir= a(Tc)lb Design Flow(25 and 100 year): a=2.66 (25-year)2.61 (100-year); b=-0.65 (25-year) -0.63 (100-year) A C Pr Ir Q 8.6 0.565 3.00 0.690 10.06 25 year 8.6 0.565 3.90 0.706 13.38 100 year Basin Time of Concentration: Time (min) = (DistanceNelocity)60 V= Kr(Slope)AO.5 Distance Slope Kr Velocity Travel Time Tc 260 1.50 10.10 1.24 3.50 3.50 460 3.00 20.00 3.46 2.21 5.72 270 1.00 20.00 2.00 2.25 7.97 <-Basin Tc Page 1 of 1 Flows Based on K.C. Modified Rational Method Backwater Calculations, Phase III, 100-yr Event BACKWATER COMPUTER PROGRAM FOR PIPES Pipe data from file:PH3-1.bwp Surcharge condition at intermediate junctions Tailwater Elevation:251. feet Discharge Range:19.1 to 19.1 Step of 1. [cfs] Overflow Elevation:281.18 feet Weir:NONE Upstream Velocity:0. feet/sec PIPE NO. 1: 154 LF - 3611CP @ 1.68% OUTLET: 246.60 INLET: 249.18 INTYP: 5 JUNC NO. 1: OVERFLOW-EL: 261.30 BEND: 0 DEG DIA/WIDTH: 6.0 Q-RATIO: 0.00 Q(CFS) HW(FT) HW ELEV. * N-FAC DC DN TW DO DE HWO HWI ******************************************************************************* 19.10 2 .14 251.32 * 0.012 1.41 0.92 4 .40 4 .40 1.83 2.14 1.88 CB 402 PIPE NO. 2: 49 LF - 3611CP @ 1.00% OUTLET: 252.63 INLET: 253 .12 INTYP: 5 JUNC NO. 2: OVERFLOW-EL: 259.47 BEND: 45 DEG DIA/WIDTH: 6.0 Q-RATIO: 0 .42 Q(CFS) HW(FT) HW ELEV. * N-FAC DC DN TW DO DE HWO HWI ******************************************************************************* 19.10 1.91 255.03 * 0.012 1.41 1.06 0.00 1.06 1.41 ***** 1.91 PIPE NO. 3: 62 LF - 2411CP @ 2 .00% OUTLET: 254.12 INLET: 255.36 INTYP: 5 JUNC NO. 3 : OVERFLOW-EL: 260.13 BEND: 90 DEG DIA/WIDTH: 2.5 Q-RATIO: 0.00 Q(CFS) HW(FT) HW ELEV. * N-FAC DC DN TW DO DE HWO HWI ******************************************************************************* 13 .45 2.15 257.51 * 0.012 1.33 0. 87 0.91 0.91 1.33 ***** 2 .15 PIPE NO. 4 : 64 LF - 2411CP @ 2 .00% OUTLET: 255.36 INLET: 256.64 INTYP: 5 JUNC NO. 4: OVERFLOW-EL: 261.74 BEND: 10 DEG DIA/WIDTH: 2 .0 Q-RATIO: 0.01 Q(CFS) HW(FT) HW ELEV. * N-FAC DC DN TW DO DE HWO HWI ******************************************************************************* 13.45 1.80 258.44 * 0.012 1.33 0.87 2 .15 2.15 1.33 ***** 1.80 PIPE NO. 5: 204 LF - 24"CP @ 1.03% OUTLET: 256.64 INLET: 258.74 INTYP: 4 JUNC NO. 5: OVERFLOW-EL: 265.96 BEND: 0 DEG DIA/WIDTH: 2.0 Q-RATIO: 0 .05 Q(CFS) HW(FT) HW ELEV. * N-FAC DC DN TW DO DE HWO HWI ******************************************************************************* 13 .32 1.32 260.06 * 0.012 1.32 1.05 1.80 1.80 1.32 ***** 1 .21 CB 413 PIPE NO. 6: 181 LF - 1811CP @ 0.50% OUTLET: 259.24 INLET: 260 .15 INTYP: 5 JUNC NO. 6: OVERFLOW-EL: 264.03 BEND: 0 DEG DIA/WIDTH: 3 .0 Q-RATIO: 0 .06 Q(CFS) HW(FT) HW ELEV. * N-FAC DC DN TW DO DE HWO HWI 12.68 3.19 263 .34 * 0 .012 1.35 1.50 0.82 1.35 2.65 3 .19 2 .39 Backwater Calculations, Phase III, 100-yr Event Page 1 of 1 Model 3,Backwater Analysis BACKWATER COMPUTER PROGRAM FOR PIPES Pipe data from file:MODEL3 .bwp Surcharge condition at intermediate junctions Tailwater Elevation:255 .03 feet Discharge Range:8.41 to 11.27 Step of 2.87 [cfs] Overflow Elevation:294 .5 feet Weir:NONE Upstream Velocity:0. feet/sec CB 402 PIPE NO. 1: 104 LF - 18"CP @ 0.50% OUTLET: 254.62 INLET: 255.14 INTYP: 5 JUNC NO. 1: OVERFLOW-EL: 259.00 BEND: 15 DEG DIA/WIDTH: 3 .0 Q-RATIO: 0.00 Q(CFS) HW(FT) HW ELEV. * N-FAC DC DN TW DO DE HWO HWI ******************************************************************************* 8.41 1.60 256.74 * 0.012 1.13 1.31 0.41 1.13 1.31 1.60 1.57 11.28 2 .25 257.39 * 0.012 1.29 1.50 0.41 1.29 1.88 2 .25 2 .04 CB 404 PIPE NO. 2: 94 LF - 1811CP @ 0.50% OUTLET: 255.14 INLET: 255.61 INTYP: 5 JUNC NO. 2 : OVERFLOW-EL: 259.39 BEND: 45 DEG DIA/WIDTH: 3.0 Q-RATIO: 0.10 Q(CFS) HW(FT) HW ELEV. * N-FAC DC DN TW DO DE HWO HWI ******************************************************************************* 8.41 2.02 257.63 * 0.012 1.13 1.31 1.60 1.60 1.64 2 .02 1.74 11.28 3 .37 258.98 * 0.012 1.29 1.50 2 .25 2 .25 2.70 3 .37 2 .35 CB 422 PIPE NO. 3 : 43 LF - 1811CP @ 0.77% OUTLET: 255.61 INLET: 255.94 INTYP: 5 JUNC NO. 3 : OVERFLOW-EL: 261.00 BEND: 10 DEG DIA/WIDTH: 3 .0 Q-RATIO: 0.00 Q(CFS) HW(FT) HW ELEV. * N-FAC DC DN TW DO DE HWO HWI ******************************************************************************* 7.65 2 .05 257.99 * 0.012 1.08 0.99 2 .02 2 .02 1.89 2 .05 1.47 10.25 3 .68 259.62 * 0.012 1.24 1.28 3 .37 3 .37 3 .39 3 .68 1.84 CB 424 PIPE NO. 4: 35 LF - 1811CP @ 0.74% OUTLET: 255.94 INLET: 256.20 INTYP: 5 JUNC NO. 4 : OVERFLOW-EL: 261. 00 BEND: 10 DEG DIA/WIDTH: 3 .0 Q-RATIO: 0.00 Q(CFS) HW(FT) HW ELEV. * N-FAC DC DN TW DO DE HWO HWI ******************************************************************************* 7.65 2 .11 258.31 * 0.012 1.08 1.00 2 .05 2 .05 1.95 2 .11 1.47 10.25 3 .99 260.19 * 0.012 1.24 1.31 3.68 3 .68 3 .71 3 . 99 1.84 CB 601 PIPE NO. 5: 115 LF - 18"CP @ 1.89% OUTLET: 256.20 INLET: 258.37 INTYP: 5 JUNC NO. 5 : OVERFLOW-EL: 262 .99 BEND: 90 DEG DIA/WIDTH: 3 . 0 Q-RATIO: 0 .14 Q(CFS) HW(FT) HW ELEV. * N-FAC DC DN TW DO DE HWO HWI ******************************************************************************* 7.65 1. 83 260.20 * 0. 012 1.08 0.75 2 . 11 2 .11 1.08 ***** 1.83 10.25 3 .72 262 .09 * 0.012 1.24 0. 89 3 .99 3 .99 2 .76 3 .72 2 .50 Page 1 of 3 Model 3, Backwater Analysis Model 3, Backwater Analysis CB 603 PIPE NO. 6: 175 LF - 18"CP @ 2 .06% OUTLET: 258.37 INLET: 261.97 INTYP: 5 JUNC NO. 6: OVERFLOW-EL: 266.47 BEND: 0 DEG DIA/WIDTH: 3 .0 Q-RATIO: 0.09 Q(CFS) HW(FT) HW ELEV. * N-FAC DC DN TW DO DE HWO HWI ******************************************************************************* 6.71 1.40 263 .37 * 0.012 1.01 0.67 1.83 1.83 1.01 ***** 1.40 9.00 1.71 263 .68 * 0.012 1.17 0.80 3.72 3 .72 1.17 ***** 1.71 CB 605 PIPE NO. 7: 86 LF - 1811CP @ 1.00% OUTLET: 261.97 INLET: 262 .83 INTYP: 5 JUNC NO. 7: OVERFLOW-EL: 267 .63 BEND: 0 DEG DIA/WIDTH: 3.0 Q-RATIO: 0.34 Q(CFS) HW(FT) HW ELEV. * N-FAC DC DN TW DO DE HWO HWI ******************************************************************************* 6.15 1.41 264 .24 * 0.012 0.96 0.79 1.40 1.40 0.96 ***** 1.41 8.25 1.75 264 .58 * 0.012 1.12 0.95 1.71 1.71 1.20 1.75 1.72 CB 608 PIPE NO. 8: 56 LF - 18"CP @ 0.50% OUTLET: 262 .83 INLET: 263.11 INTYP: 5 JUNC NO. 8: OVERFLOW-EL: 267.15 BEND: 90 DEG DIA/WIDTH: 3 .0 Q-RATIO: 0.17 Q(CFS) HW(FT) HW ELEV. * N-FAC DC DN TW DO DE HWO HWI ******************************************************************************* 4.59 1.58 264 .69 * 0.012 0.83 0.82 1.41 1.41 1.18 1.58 1.39 6.16 2.24 265.35 * 0.012 0.96 0.99 1.75 1.75 1.64 2 .24 1.80 CB 701 PIPE NO. 9: 178 LF - 12"CP @ 3 .00% OUTLET: 263 .61 INLET: 268.95 INTYP: 5 JUNC NO. 9: OVERFLOW-EL: 273 .07 BEND: 5 DEG DIA/WIDTH: 3.0 Q-RATIO: 0.18 Q(CFS) HW(FT) HW ELEV. * N-FAC DC DN TW DO DE HWO HWI ******************************************************************************* 3.92 1.42 270.37 * 0.012 0.85 0.56 1.08 1.08 0.85 ***** 1.42 5.26 2.03 270.98 * 0.012 0.93 0.67 1.74 1.74 0.93 ***** 2 .03 CB 703 PIPE NO. 10: 114 LF - 12"CP @ 4 .43% OUTLET: 268.95 INLET: 274.00 INTYP: 5 JUNC NO. 10: OVERFLOW-EL: 277.50 BEND: 5 DEG DIA/WIDTH: 3 .0 Q-RATIO: 0.15 Q(CFS) HW(FT) HW ELEV. * N-FAC DC DN TW DO DE HWO HWI ******************************************************************************* 3 .33 1. 18 275.18 * 0.012 0.79 0.45 1.42 1.42 0.79 ***** 1.18 4.46 1.61 275.61 * 0.012 0.89 0.53 2 .03 2 . 03 0.89 ***** 1.61 CB 704 PIPE NO. 11: 169 LF - 12"CP @ 3 .50% OUTLET: 274 . 00 INLET: 279.91 INTYP: 5 JUNC NO. 11: OVERFLOW-EL: 284 .03 BEND: 2 DEG DIA/WIDTH: 3 . 0 Q-RATIO: 0 .20 Q(CFS) HW(FT) HW ELEV. * N-FAC DC DN TW DO DE HWO HWI ******************************************************************************* 2.89 1. 07 280 .98 * 0.012 0.73 0.45 1. 18 1. 18 0.73 ***** 1.07 3.88 1.41 281.32 * 0.012 0.84 0.53 1.61 1.61 0.84 ***** 1.41 Page 2 of 3 Model 3, Backwater Analysis Model 3, Backwater Analysis CB 706 PIPE NO.12 : 190 LF - 12"CP @ 2 .67% OUTLET: 279.91 INLET: 284 .99 INTYP: 5 JUNC NO.12 : OVERFLOW-EL: 288 .99 BEND: 0 DEG DIA/WIDTH: 3.0 Q-RATIO: 0.31 Q(CFS) HW(FT) HW ELEV. * N-FAC DC DN TW DO DE HWO HWI 2 .41 0.97 285. 96 * 0.012 0.67 0.43 1.07 1.07 0.67 ***** 0.97 3 .23 1.22 286.20 * 0.012 0.78 0.51 1.41 1.41 0.78 ***** 1.22 CB 708 PIPE NO.13 : 195 LF - 12"CP @ 1.80% OUTLET: 284 .99 INLET: 288.50 INTYP: 5 JUNC NO.13 : OVERFLOW-EL: 291.98 BEND: 0 DEG DIA/WIDTH: 3 . 0 Q-RATIO: 0.22 Q(CFS) HW(FT) HW ELEV. * N-FAC DC DN TW DO DE HWO HWI ******************************************************************************* 1.84 0. 81 289.31 * 0.012 0.58 0.42 0.97 0.97 0.58 ***** 0.81 2.47 0. 98 289.48 * 0.012 0.68 0.49 1.22 1.22 0.68 ***** 0.98 CB 709 PIPE NO.14 : 139 LF - 12"CP @ 3 .24% OUTLET: 288.50 INLET: 293 .00 INTYP: 5 Q(CFS) HW(FT) HW ELEV. * N-FAC DC DN TW DO DE HWO HWI ******************************************************************************* 1.51 0.76 291.76 * 0.012 0.53 0.37 0.81 0. 81 0.53 ***** 0.76 2.02 0.92 291. 92 * 0.012 0.61 0.44 0.98 0.98 0.61 ***** 0.92 Page 3 of 3 Model 3, Backwater Analysis Model 4, Backwater Analysis BACKWATER COMPUTER PROGRAM FOR PIPES Pipe data from file:model4.bwp Surcharge condition at intermediate junctions Tailwater Elevation:263 .34 feet Discharge Range:10.06 to 13 .38 Step of 3.32 [cfs] Overflow Elevation:290.46 feet Weir:NONE Upstream Velocity:0. feet/sec CB 415 PIPE NO. 1: 56 LF - 1811CP @ 1.00% OUTLET: 261.60 INLET: 262 .16 INTYP: 5 JUNC NO. 1: OVERFLOW-EL: 2,66.74 BEND: 5 DEG DIA/WIDTH: 3 .0 Q-RATIO: 0.34 Q(CFS) HW(FT) HW ELEV. * N-FAC DC DN TW DO DE HWO HWI ******************************************************************************* 10.06 2 .06 264.22 * 0.012 1.23 0.92 2.33 2.33 1.72 2 .06 1.86 13.38 2 .73 264.89 * 0.012 1.37 1.13 2.33 2.33 2 . 13 2 .73 2.53 CB 615 PIPE NO. 2 : 144 LF - 1511CP @ 3.60% OUTLET: 262 .41 INLET: 267.60 INTYP: 5 JUNC NO. 2 : OVERFLOW-EL: 271.56 BEND: 5 DEG DIA/WIDTH: 3.0 Q-RATIO: 0.37 Q(CFS) HW(FT) HW ELEV. * N-FAC DC DN TW DO DE HWO HWI ******************************************************************************* 7.51 2 .09 269.69 * 0.012 1.09 0.68 1.81 1.81 1.09 ***** 2.09 9.99 3.06 270.66 * 0.012 1.19 0.81 2 .48 2 .48 1.19 ***** 3 .06 CB 710 PIPE NO. 3: 99 LF - 1511CP @ 3 .50% OUTLET: 267.60 INLET: 271.06 INTYP: 5 JUNC NO. 3: OVERFLOW-EL: 275.22 BEND: 2 DEG DIA/WIDTH: 3 .0 Q-RATIO: 0.74 Q(CFS) HW(FT) HW ELEV. * N-FAC DC DN TW DO DE HWO HWI ******************************************************************************* 5.48 1.55 272.61 * 0.012 0.95 0.57 2.09 2 .09 0.95 ***** 1.55 7.29 2 .12 273 .18 * 0.012 1.08 0.67 3.06 3 .06 1.08 ***** 2 .12 CB 711 PIPE NO. 4 : 127 LF - 1511CP @ 3.30% OUTLET: 271.06 INLET: 275.25 INTYP: 5 JUNC NO. 4 : OVERFLOW-EL: 280.05 BEND: 3 DEG DIA/WIDTH: 3.0 Q-RATIO: 0.16 Q(CFS) HW(FT) HW ELEV. * N-FAC DC DN TW DO DE HWO HWI ******************************************************************************* 3. 15 0. 89 276.40 * 0.012 0.72 0.42 1.55 1.55 0.72 ***** 0.89 4. 19 1.01 276.52 * 0.012 0.83 0.49 2.12 2 .12 0.83 ***** 1.01 CB 717 PIPE NO. 5: 117 LF - 1211CP @ 1.57% OUTLET: 275.50 INLET: 277.34 INTYP: 5 JUNC NO. 5: OVERFLOW-EL: 283 .24 BEND: 2 DEG DIA/WIDTH: 4 .0 Q-RATIO: 0.84 Q(CFS) HW(FT) HW ELEV. * N-FAC DC DN TW DO DE HWO HWI ******************************************************************************* 2.71 1.11 278 .88 * 0.012 0.71 0.53 0.64 0.64 0.71 3.61 1.46 279.23 * 0.012 0. 82 0.63 0.76 0.76 0. 82 ***** 1.46 Page I of 3 Model 4, Backwater Analysis Model 4, Backwater Analysis CB 718 PIPE NO. 6: 30 LF - 12"CP @ 4.67% OUTLET: 277.34 INLET: 278.74 INTYP: 5 JUNC NO. 6: OVERFLOW-EL: 283.24 BEND: 90 DEG DIA/WIDTH: 3.0 Q-RATIO: 0.00 Q(CFS) HW(FT) HW ELEV. * N-FAC DC DN TW DO DE HWO HWI ******************************************************************************* 1.48 0.76 279.45 * 0.012 0.52 0.32 1.11 1.11 0.52 ***** 0.76 1.96 0.92 279.61 * 0.012 0.60 0.37 1.46 1.46 0.60 ***** 0.92 CB 719 PIPE NO. 7: 94 LF - 12"CP @ 1.86% OUTLET: 278.74 INLET: 280.49 INTYP: 5 JUNC NO. 7: OVERFLOW-EL: 285.09 BEND: 90 DEG DIA/WIDTH: 3 .0 Q-RATIO: 0.20 Q(CFS) HW(FT) HW ELEV. * N-FAC DC DN TW DO DE HWO HWI ******************************************************************************* 1.48 0.76 281.25 * 0.012 0.52 0.36 0.76 0.76 0.52 ***** 0.76 1.96 0.93 281.42 * 0.012 0.60 0.42 0.92 0.92 0.60 ***** 0.93 CB 722 PIPE NO. 8: 107 LF - 1211CP @ 1.80% OUTLET: 280.49 INLET: 282.42 INTYP: 5 JUNC NO. 8: OVERFLOW-EL: 286.69 BEND: 2 DEG DIA/WIDTH: 3 .0 Q-RATIO: 0.78 Q(CFS) HW(FT) HW ELEV. * N-FAC DC DN TW DO DE HWO HWI ******************************************************************************* 1.23 0.66 283 .54 * 0.012 0.47 0.32 0.76 0.76 0.47 ***** 0.66 1.64 0.78 283 .66 * 0.012 0.55 0.37 0.93 0.93 0.55 ***** 0.78 CB 724 PIPE NO. 9: 71 LF - 12"CP @ 1.80% OUTLET: 282.42 INLET: 283 .70 INTYP: 5 JUNC NO. 9: OVERFLOW-EL: 287.72 BEND: 10 DEG DIA/WIDTH: 3 .0 Q-RATIO: 0.38 Q(CFS) HW(FT) HW ELEV. * N-FAC DC DN TW DO DE HWO HWI ******************************************************************************* 0.69 0.47 284 .17 * 0.012 0.35 0.28 0.66 0.66 0.35 ***** 0.47 0.92 0.55 284.25 * 0.012 0.41 0.32 0.78 0.78 0.41 ***** 0.55 CB 725 PIPE NO. 10: 69 LF - 1211CP @ 1.14% OUTLET: 283.70 INLET: 284 .49 INTYP: 5 JUNC NO. 10: OVERFLOW-EL: 288.61 BEND: 10 DEG DIA/WIDTH: 3 .0 Q-RATIO: 0.75 Q(CFS) HW(FT) HW ELEV. * N-FAC DC DN TW DO DE HWO HWI ******************************************************************************* 0.50 0.40 284 .89 * 0.012 0.30 0.24 0.47 0.47 0.30 ***** 0.40 0.67 0.46 284.95 * 0.012 0.35 0.28 0.55 0.55 0.35 ***** 0.46 CB 727 PIPE NO. 11: 112 LF - 12"CP @ 1.60% OUTLET: 284 .49 INLET: 286.28 INTYP: 5 JUNC NO. 11: OVERFLOW-EL: 290.22 BEND: 10 DEG DIA/WIDTH: 3 .0 Q-RATIO: 0.52 Q(CFS) HW(FT) HW ELEV. * N-FAC DC DN TW DO DE HWO HWI ******************************************************************************* 0.29 0.29 286.58 * 0.012 0.23 0.17 0.40 0.40 0.23 ***** - 0.29 0.38 0.33 286.62 * 0.012 0.26 0.19 0.46 0.46 0.26 ***** 0.33 Page 2 of 3 Model 4, Backwater Analysis Model 4, Backwater Analysis CE 728 PIPE NO.12: 34 LF - 8"CP @ 2 .00% OUTLET: 286.61 INLET: 287.29 INTYP: 5 Q(CFS) HW(FT) HW ELEV. * N-FAC DC DN TW DO DE HWO HWI ******************************************************************************* 0.19 0.27 287.56 * 0.012 0.20 0.15 0.00 0.15 0.20 ***** 0.27 0.25 0.31 287.60 * 0.012 0.24 0.17 0.01 0.17 0.24 ***** 0.31 Page 3 of 3 Model 4, Backwater Analysis 10/15/02 LIBERTY RIDGE, PHASE VI/VII—PIPE SIZING CALCULATIONS See "Pipe Sizing Exhibit, Phase VI and VII" at the end of this section as an aid to the following discussion. The storm conveyance for Liberty Ridge, Phase VI and VII is divided into two hydrologic basins that are almost the same size. The northern basin, called "Model 3" in this analysis, is 9.17 acres and directs flow to an existing 18-inch stub from CB 424 in Phase IVB a few catch basins upstream of Pond C between lots 225 and 226. The backwater modeling for this basin began at existing CB 402 in Phase III, the tailwater in this CB for the 100-year event was the starting freewater surface for the analysis ( see `Backwater Calculations, Phase III, 100 yr Event" at the end of this section ). The southern basin is called "Model 4" and flows to an existing 18-inch stub from CB 415 also in Phase NB. The backwater modeling for this basin began at existing CB 413 in Phase III, the tailwater in this CB for the 100-year event was the starting freewater surface for the analysis ( see "Backwater Calculations, Phase III, 100 yr Event"at the end of this section) . The storm runoff calculated at each catch basin junction was determined using the King County Modified Rational Method applied to the entire basin and then divided up into catchments using the measured areas of the basins.These measured areas were used, as Q-ratios,to determine the appropriate runoff(see "Q-ratio Calculations"at the end of this section). The amount of 100- year flow and the tailwater elevations used for each of the models is summarized in the following table.The resultant backwater output is also included with this report. Flow (cfs) Tailwater CB ID, Hyd. Model Q-100 (Elevation) Model 3 11.27 255.03 CB 402, PI3-1 Model 4 13.38 263.34 CB 413, PH3-1 Summary of Backwater Modeling Parameters Using the above referenced flows and tailwater elevations the pipe system was sized using the King County Backwater program. The out put for the pipe conveyance models are included at the Page 1 of 2 10/15/02 end of this summary (see "Model 3, Backwater Analysis" and "Model 4, Backwater Analysis" for the detailed output from the KCBW program. Per the King County Standard for Pipe Conveyance sizing (Core Requirement #4, Page 1.2.4-1)all flow for the 100-year event is contained within the pipe system. -James A.Morin, PE Page 2 of 2 1 TIN A880CIATES - *�� rroieM ll.nuemenl Ci.il�LmecriuL ,._"...._._.....-- land S—, 7�6 1 _ land Um Phminc lands pe.lrehiudl ! - S9le Dnidn 1"14 1151h kw R Ikkin&4 MOU-MEd _ ,D r a eoo dee orse CB 424 r Z r AREA, IN ACRES F F (TYP.) SCALE 1" = 60' 3 x "► ♦ _______ -. - TIME--OF CONCENTRATION W `�� 9. 17 FLOW INJECTION POINT TRA vEL PA TH SLOPE Q h �602 Wl TH CB NUMBER (T YP.) (T YP.) c ;. 0.51 cc looso 3 r i - 0. 1 ` 0.50 `J `< _ 0.45 37 �. a 1 55 }704 8 8 k , � 703 , t( , 701 �;: �.�r J�!• 7�OgvO 442,� @� 70� _ 709.` =���= W �i cc 0 r < - -' 0a30 �•� 5�....... ♦��..�.m �a�a �a�.�� ���s•-� �� rR 705 r' o so sos� io2 0.51 . 12 023 707 1$ _ - - . v f MODEL:PH3-1 _ s = 0 728�= 0.35715 z . _ 0 10 CB 40L _ _ rrl,rrbrrrt I t 7 _ Kj. _ _ 0.32 y 609 0.22 - j"2 TW=255.03 ,: i i a _ = h 7 605 _ (100—YEA R)._. - - U 0.52 _ 0.22 72 - 0.84 2 5 - 725 000001,8 ® _ _. >- ,, _ 00 01 F 4} D 65 _ 720�. r 721 = 0 �r # ;,1 1 o- 6 .. r _ @ 60 O - Ili 6 f 71i— \ 5, sM.,.. ` 3 14 `\ \ \` / } '= �/ \ �} '',• Sli. -'� ti `,,a,� � .s x, ay..�*'" i r - li Os Awry ' � �{+:'r'•-' pr` ®+-,,6 ,may O 6.6 S l/ 1 '� y, 4s ry \Fi, ft' \` -Al z ��i�ar�^' n 799' i 4 C8- T .24 �1.i6 `t)t'-. �1' _4;` �*` ._ ',,a'q i y ? `t � 'N S a-� �`` s s '`� „F- 6.35 yr� j, 0.�36 }� .l y t. T w `7 y�"`;'r_� �, ...v. { ,• t t i' I .\`�'r -ri`-r•-r�.26 `i, t ,. PROJECT YdNAC6C!\`t �� - I;= ,. .22 710� � �� Y� �12 S ' I esoJecr susvaros FBOIFXT ENGINEER % +�+'+''R+ ., j LANDSCAPE ARCHITECT DATE: Ii T O --------•.-_".� i O.3® 0.35 0.$4 �`' 8.60 r A �� ` r y i CA TCHMENT BOUNDARY (TYP.) t MODEL NAME (TYP) STAMP NOT YII1D ;. ONIM SIGNED AND DATIM r i f ! v'•" _. -" JOB NUMBER .- 00-022 1 SHEET NIB®RB DF 1 ©2000'TRIAD ASSOgATES Q-ratio Calculations MODEL 3 Total Contributing Upstream Q-ratio Desc. Area (AC) Area 1.33 0.00 0.00 CB 709 0.37 1.70 0.22 CB 708 0.65 2.07 0.31 CB 706 + 707 0.55 2.72 0.20 CB 704 + 705 0.50 3.27 0.15 CB 703 0.69 3.77 0.18 CB 701 + 702 0.77 4.46 0.17 CB 608 + 609 1.78 5.23 0.34 CB 606 + 607 0.62 7.01 0.09 CB 603 + 604 1.04 7.63 0.14 CB 601 + 602 0.90 8.67 0.10 CB 405 9.17 Page 1 of 2 0-ratio Calculations Q-ratio Calculations MODEL 4 0.32 0.00 0.00 CB 728 0.35 0.67 0.52 CB 727 1.06 1.41 0.75 CB 725 + 726 0.64 1.70 0.38 CB 724 0.40 1.04 0.38 CB 722 + 723 1.43 1.83 0.78 CB 719 + 720 + 721 0.36 1.79 0.20 CB 717 + 718 1.83 2.19 0.84 CB 712 -> 716 0.35 2.18 0.16 CB 710 0.99 1.34 0.74 CB 615 + 616 0.57 1.56 0.37 CB 612 + 614 0.30 0.87 0.34 CB 415 8.60 Page 2 of 2 0-ratio Calculations Basin Flows Based on K.C. Modified Rational Method Model 3: Q=CA(Pr*lr) Ir= a(Tc)^b Design Flow(25 and 100 year): a=2.66 (25-year)2.61 (100-year); b=-0.65 (25-year) -0.63 (100-year) A C Pr Ir Q 9.17 0.565 3.00 0.541 8.41 25 year 9.17 0.565 3.90 0.558 11.27 100 year Basin Time of Concentration: Time (min) = (DistanceNelocity)60 V= Kr(Slope)AO.5 Distance Slope Kr Velocity Travel Time Tc 250 1.00 10.10 1.01 4.13 4.13 425 2.00 20.00 2.83 2.50 6.63 600 3.00 20.00 3.46 2.89 9.52 350 2.00 20.00 2.83 2.06 11.58 <-Basin Tc Model 4: Q=CA(Pr'Ir) Ir = a(Tc)^b Design Flow (25 and 100 year): a=2.66 (25-year)2.61 (100-year); b=-0.65 (25-year) -0.63 (100-year) A C Pr Ir Q 8.6 0.565 3.00 0.690 10.06 25 year 8.6 0.565 3.90 0.706 13.38 100 year Basin Time of Concentration: Time (min) = (DistanceNelocity)60 V= Kr(Slope)AO.5 Distance Slope Kr Velocity Travel Time Tc 260 1.50 10.10 1.24 3.50 3.50 460 3.00 20.00 3.46 2.21 5.72 270 1.00 20.00 2.00 2.25 7.97 <-Basin Tc Page 1 of 1 Flows Based on K.C. Modified Rational Method Backwater Calculations, Phase III, 100-yr Event BACKWATER COMPUTER PROGRAM FOR PIPES Pipe data from file:PH3-l.bwp Surcharge condition at intermediate junctions Tailwater Elevation:251. feet Discharge Range:19.1 to 19.1 Step of 1. [cfs] Overflow Elevation:281.18 feet Weir:NONE Upstream Velocity:0. feet/sec PIPE NO. 1: 154 LF - 3611CP @ 1.68% OUTLET: 246.60 INLET: 249.18 INTYP: 5 JUNC NO. 1: OVERFLOW-EL: 261.30 BEND: 0 DEG DIA/WIDTH: 6.0 Q-RATIO: 0.00 Q(CFS) HW(FT) HW ELEV. * N-FAC DC DN TW DO DE HWO HWI ******************************************************************************* 19.10 2 .14 251.32 * 0.012 1.41 0.92 4 .40 4.40 1.83 2 .14 1.88 CB 402 PIPE NO. 2: 49 LF - 3611CP @ 1.00% OUTLET: 252 .63 INLET: 253.12 INTYP: 5 JUNC NO. 2:' OVERFLOW-EL: 259.47 BEND: 45 DEG DIA/WIDTH: 6.0 Q-RATIO: 0.42 Q(CFS) HW(FT) HW ELEV. * N-FAC DC DN TW DO DE HWO HWI ******************************************************************************* 19.10 1. 91 255.03 * 0.012 1.41 1.06 0 .00 1.06 1.41 ***** 1.91 PIPE NO. 3 : 62 LF - 24"CP @ 2 .00% OUTLET: 254 .12 INLET: 255.36 INTYP: 5 JUNC NO. 3 : OVERFLOW-EL: 260. 13 BEND: 90 DEG DIA/WIDTH: 2 .5 Q-RATIO: 0.00 Q(CFS) HW(FT) HW ELEV. * N-FAC DC DN TW DO DE HWO HWI ******************************************************************************* 13.45 2.15 257.51 * 0.012 1.33 0.87 0.91 0.91 1.33 ***** 2 .15 PIPE NO. 4: 64 LF - 2411CP @ 2 .00% OUTLET: 255.36 INLET: 256.64 INTYP: 5 JUNC NO. 4 : OVERFLOW-EL: 261.74 BEND: 10 DEG DIA/WIDTH: 2 .0 Q-RATIO: 0.01 Q(CFS) HW(FT) HW ELEV. * N-FAC DC DN TW DO DE HWO HWI ******************************************************************************* 13 .45 1.80 258.44 * 0.012 1.33 0.87 2 .15 2.15 1.33 ***** 1.80 PIPE NO. 5: 204 LF - 2411CP @ 1.03% OUTLET: 256.64 INLET: 258.74 INTYP: 4 JUNC NO. 5 : OVERFLOW-EL: 265. 96 BEND: 0 DEG DIA/WIDTH: 2.0 Q-RATIO: 0.05 Q(CFS) HW(FT) HW ELEV. * N-FAC DC DN TW DO DE HWO HWI 13.32 1.32 260.06 * 0.012 1.32 1.05 1.80 1.80 1.32 ***** 1.21 CB 413 PIPE NO. 6: 181 LF - 1811CP @ 0.50% OUTLET: 259.24 INLET: 260.15 INTYP: 5 JUNC NO. 6: OVERFLOW-EL: 264. 03 BEND: 0 DEG DIA/WIDTH: 3 . 0 Q-RATIO: 0.06 Q(CFS) HW(FT) HW ELEV. * N-FAC DC DN TW DO DE HWO HWI 12.68 3.19 263.34 * 0 .012 1.35 1.50 0.82 1.35 2.65 3 .19 2 .39 Backwater Calculations, Phase III, 100-yr Event Pagel of 1 Model 3, Backwater Analysis BACKWATER COMPUTER PROGRAM FOR PIPES Pipe data from file:MODEL3 .bwp Surcharge condition at intermediate junctions Tailwater Elevation:255.03 feet Discharge Range:8.41 to 11.27 Step of 2 .87 [cfs] Overflow Elevation:294 .5 feet Weir:NONE Upstream Velocity:0. feet/sec CB 402 PIPE NO. 1: 104 LF - 1811CP @ 0.50% OUTLET: 254.62 INLET: 255.14 INTYP: 5 JUNC NO. 1: OVERFLOW-EL: 259.00 BEND: 15 DEG DIA/WIDTH: 3.0 Q-RATIO: 0.00 Q(CFS) HW(FT) HW ELEV. * N-FAC DC DN TW DO DE HWO HWI ******************************************************************************* 8.41 1.60 256.74 * 0.012 1.13 1.31 0.41 1.13 1.31 1.60 1.57 11.28 2.25 257.39 * 0.012 1.29 1.50 0.41 1.29 1.88 2 .25 2.04 CB 404 PIPE NO. 2 : 94 LF - 1811CP @ 0.50% OUTLET: 255.14 INLET: 255.61 INTYP: 5 JUNC NO. 2 : OVERFLOW-EL: 259.39 BEND: 45 DEG DIA/WIDTH: 3.0 Q-RATIO: 0.10 Q(CFS) HW(FT) HW ELEV. * N-FAC DC DN TW DO DE HWO HWI ******************************************************************************* 8.41 2.02 257.63 * 0.012 1.13 1.31 1.60 1.60 1.64 2.02 1.74 11.28 3 .37 258.98 * 0. 012 1.29 1.50 2.25 2.25 2.70 3 .37 2 .35 CB 422 PIPE NO. 3 : 43 LF - 1811CP @ 0.77% OUTLET: 255.61 INLET: 255.94 INTYP: 5 JUNC NO. 3 : OVERFLOW-EL: 261.00 BEND: 10 DEG DIA/WIDTH: 3.0 Q-RATIO: 0.00 Q(CFS) HW(FT) HW ELEV. * N-FAC DC DN TW DO DE HWO HWI ******************************************************************************* 7.65 2.05 257.99 * 0.012 1.08 0.99 2 .02 2 .02 1.89 2 .05 1.47 10.25 3.68 259.62 * 0.012 1.24 1.28 3 .37 3.37 3.39 3 .68 1.84 CB 424 PIPE NO. 4 : 35 LF - 1811CP @ 0.74% OUTLET: 255.94 INLET: 256.20 INTYP: 5 JUNC NO. 4 : OVERFLOW-EL: 261.00 BEND: 10 DEG DIA/WIDTH: 3 .0 Q-RATIO: 0.00 Q(CFS) HW(FT) HW ELEV. * N-FAC DC DN TW DO DE HWO HWI ******************************************************************************* 7.65 2 .11 258.31 * 0.012 1.08 1.00 2.05 2 .05 1.95 2. 11 1.47 10.25 3 .99 260. 19 * 0.012 1.24 1.31 3.68 3.68 3 .71 3 .99 1.84 CB 601 PIPE NO. 5 : 115 LF - 1811CP @ 1.89% OUTLET: 256.20 INLET: 258.37 INTYP: 5 JUNC NO. 5 : OVERFLOW-EL: 262 .99 BEND: 90 DEG DIA/WIDTH: 3.0 Q-RATIO: 0.14 Q(CFS) HW(FT) HW ELEV. * N-FAC DC DN TW DO DE HWO HWI ******************************************************************************* 7.65 1.83 260.20 * 0.012 1.08 0.75 2 .11 2.11 1.08 ***** 1.83 10.25 3 .72 262.09 * 0.012 1.24 0.89 3.99 3 .99 2 .76 3 .72 2 .50 Page 1 of 3 Model 3, Backwater Analysis Model 3,Backwater Analysis CB 603 PIPE NO. 6: 175 LF - 18"CP @ 2.06% OUTLET: 258.37 INLET: 261.97 INTYP: 5 JUNC NO. 6: OVERFLOW-EL: 266.47 BEND: 0 DEG DIA/WIDTH: 3 .0 Q-RATIO: 0.09 Q(CFS) HW(FT) HW ELEV. * N-FAC DC DN TW DO DE HWO HWI ******************************************************************************* 6.71 1.40 263.37 * 0.012 1.01 0.67 1.83 1.83 1.01 ***** 1.40 9.00 1.71 263.68 * 0.012 1.17 0.80 3.72 3 .72 1.17 ***** 1.71 CB 605 PIPE NO. 7: 86 LF - 18"CP @ 1.00% OUTLET: 261.97 INLET: 262.83 INTYP: 5 JUNC NO. 7: OVERFLOW-EL: 267.63 BEND: 0 DEG DIA/WIDTH: 3.0 Q-RATIO: 0.34 Q(CFS) HW(FT) HW ELEV. * N-FAC DC DN TW DO DE HWO HWI ******************************************************************************* 6.15 1.41 264.24 * 0.012 0.96 0.79 1.40 1.40 0.96 ***** 1.41 8.25 1.75 264 .58 * 0.012 1.12 0.95 1.71 1.71 1.20 1.75 1.72 CB 608 PIPE NO. 8: 56 LF - 18"CP @ 0.50% OUTLET: 262.83 INLET: 263 .11 INTYP: 5 JUNC NO. 8 : OVERFLOW-EL: 267.15 BEND: 90 DEG DIA/WIDTH: 3 .0 Q-RATIO: 0.17 Q(CFS) HW(FT) HW ELEV. * N-FAC DC DN TW DO DE HWO HWI ******************************************************************************* 4 .59 1.58 264 .69 * 0.012 0.83 0.82 1.41 1.41 1.18 1.58 1.39 6.16 2.24 265.35 * 0.012 0.96 0.99 1.75 1.75 1.64 2.24 1.80 CB 701 PIPE NO. 9: 178 LF - 12"CP @ 3.00% OUTLET: 263 .61 INLET: 268.95 INTYP: 5 JUNC NO. 9: OVERFLOW-EL: 273.07 BEND: 5 DEG DIA/WIDTH: 3.0 Q-RATIO: 0.18 Q(CFS) HW(FT) HW ELEV. * N-FAC DC DN TW DO DE HWO HWI ******************************************************************************* 3 .92 1.42 270.37 * 0.012 0.85 0.56 1.08 1.08 0.85 ***** 1.42 5.26 2.03 270.98 * 0.012 0.93 0.67 1.74 1.74 0.93 ***** 2 .03 CB 703 PIPE NO. 10: 114 LF - 12"CP @ 4 .43% OUTLET: 268.95 INLET: 274.00 INTYP: 5 JUNC NO.10: OVERFLOW-EL: 277.50 BEND: 5 DEG DIA/WIDTH: 3 .0 Q-RATIO: 0.15 Q(CFS) HW(FT) HW ELEV. * N-FAC DC DN TW DO DE HWO HWI ******************************************************************************* 3 .33 1.18 275.18 * 0.012 0.79 0.45 1.42 1.42 0.79 ***** 1. 18 4 .46 1.61 275.61 * 0.012 0.89 0.53 2.03 2.03 0.89 ***** 1.61 CB 704 PIPE NO.11: 169 LF - 12"CP @ 3 .50% OUTLET: 274 .00 INLET: 279.91 INTYP: 5 JUNC NO. 11: OVERFLOW-EL: 284.03 BEND: 2 DEG DIA/WIDTH: 3 .0 Q-RATIO: 0 .20 Q(CFS) HW(FT) HW ELEV. * N-FAC DC DN TW DO DE HWO HWI ******************************************************************************* 2.89 1.07 280.98 * 0.012 0.73 0.45 1.18 1.18 0.73 ***** 1.07 3.88 1.41 281.32 * 0.012 0.84 0.53 1.61 1.61 0. 84 ***** 1.41 Page 2 of 3 Model 3, Backwater Analysis Model 3,Backwater Analysis CB 706 PIPE NO.12 : 190 LF - 12"CP @ 2 .67% OUTLET: 279.91 INLET: 284 .99 INTYP: 5 JUNC NO.12 : OVERFLOW-EL: 288.99 BEND: 0 DEG DIA/WIDTH: 3.0 Q-RATIO: 0.31 Q(CFS) HW(FT) HW ELEV. * N-FAC DC DN TW DO DE HWO HWI ******************************************************************************* 2 .41 0.97 285.96 * 0.012 0.67 0.43 1.07 1.07 0.67 ***** 0.97 3 .23 1.22 286.20 * 0.012 0.78 0.51 1.41 1.41 0.78 ***** 1.22 CB 708 PIPE NO.13 : 195 LF - 12"CP @ 1.80% OUTLET: 284.99 INLET: 288.50 INTYP: 5 JUNC NO.13 : OVERFLOW-EL: 291.98 BEND: 0 DEG DIA/WIDTH: 3 .0 Q-RATIO: 0.22 Q(CFS) HW(FT) HW ELEV. * N-FAC DC DN TW DO DE HWO HWI ******************************************************************************* 1.84 0.81 289.31 * 0.012 0.58 0.42 0.97 0.97 0.58 ***** 0.81 2.47 0.98 289.48 * 0.012 0.68 0.49 1.22 1.22 0.68 ***** 0.98 CB 709 PIPE NO.14 : 139 LF - 12"CP @ 3.24% OUTLET: 288.50 INLET: 293 .00 INTYP: 5 Q(CFS) HW(FT) HW ELEV. * N-FAC DC DN TW DO DE HWO HWI ******************************************************************************* 1.51 0.76 291.76 * 0.012 0.53 0.37 0.81 0.81 0.53 ***** 0.76 2 .02 0.92 291.92 * 0.012 0.61 0.44 0.98 0.98 0.61 ***** 0.92 Page 3 of 3 Model 3, Backwater Analysis Model 4, Backwater Analysis BACKWATER COMPUTER PROGRAM FOR PIPES Pipe data from file:model4 .bwp Surcharge condition at intermediate junctions Tailwater Elevation:263.34 feet Discharge Range:10.06 to 13.38 Step of 3.32 [cfs] Overflow Elevation:290.46 feet Weir:NONE Upstream Velocity:0. feet/sec CB 415 PIPE NO. 1: 56 LF - 1811CP @ 1.00% OUTLET: 261.60 INLET: 262 .16 INTYP: 5 JUNC NO. 1: OVERFLOW-EL: 266.74 BEND: 5 DEG DIA/WIDTH: 3 .0 Q-RATIO: 0.34 Q(CFS) HW(FT) HW ELEV. * N-FAC DC DN TW DO DE HWO HWI 10.06 2.06 264 .22 * 0.012 1.23 0.92 2 .33 2 .33 1.72 2 .06 1.86 13 .38 2 .73 264.89 * 0.012 1.37 1.13 2.33 2 .33 2 .13 2 .73 2.53 CB 615 PIPE NO. 2 : 144 LF - 1511CP @ 3 .60% OUTLET: 262.41 INLET: 267.60 INTYP: 5 JUNC NO. 2 : OVERFLOW-EL: 271.56 BEND: 5 DEG DIA/WIDTH: 3 .0 Q-RATIO: 0.37 Q(CFS) HW(FT) HW ELEV. * N-FAC DC DN TW DO DE HWO HWI ******************************************************************************* 7.51 2 .09 269.69 * 0.012 1.09 0.68 1.81 1.81 1.09 ***** 2.09 9. 99 3 .06 270.66 * 0.012 1.19 0. 81 2 .48 2 .48 1.19 ***** 3.06 CB 710 PIPE NO. 3: 99 LF - 1511CP @ 3 .50% OUTLET: 267.60 INLET: 271.06 INTYP: 5 JUNC NO. 3 : OVERFLOW-EL: 275.22 BEND: 2 DEG DIA/WIDTH: 3 .0 Q-RATIO: 0.74 Q(CFS) HW(FT) HW ELEV. * N-FAC DC DN TW DO DE HWO HWI ******************************************************************************* 5.48 1.55 272 .61 * 0.012 0.95 0.57 2 .09 2 .09 0.95 ***** 1.55 7.29 2.12 273 .18 * 0.012 1.08 0.67 3 .06 3.06 1.08 ***** 2.12 CB 711 PIPE NO. 4 : 127 LF - 15"CP @ 3.30% OUTLET: 271.06 INLET: 275.25 INTYP: 5 JUNC NO. 4 : OVERFLOW-EL: 280.05 BEND: 3 DEG DIA/WIDTH: 3 .0 Q-RATIO: 0.16 Q(CFS) HW(FT) HW ELEV. * N-FAC DC DN TW DO DE HWO HWI ******************************************************************************* 3 . 15 0.89 276.40 * 0.012 0 .72 0.42 1.55 1.55 0.72 ***** 0.89 4. 19 1.01 276.52 * 0.012 0.83 0 .49 2 .12 2 . 12 0 .83 ***** 1.01 CB 717 PIPE NO. 5 : 117 LF - 1211CP @ 1.57% OUTLET: 275.50 INLET: 277.34 INTYP: 5 JUNC NO. 5 : OVERFLOW-EL: 283 .24 BEND: 2 DEG DIA/WIDTH: 4 .0 Q-RATIO: 0.84 Q(CFS) HW(FT) HW ELEV. * N-FAC DC DN TW DO DE HWO HWI ******************************************************************************* 2.71 1.11 278.88 * 0.012 0 .71 0.53 0 .64 0 .64 0.71 3 .61 1.46 279.23 * 0.012 0. 82 0.63 0.76 0.76 0.82 ***** 1.46 Page 1 of 3 Model 4, Backwater Analysis Model 4, Backwater Analysis CB 718 PIPE NO. 6: 30 LF - 12"CP @ 4 .67% OUTLET: 277.34 INLET: 278.74 INTYP: 5 JUNC NO. 6: OVERFLOW-EL: 283.24 BEND:' 90 DEG DIA/WIDTH: 3 .0 Q-RATIO: 0.00 Q(CFS) HW(FT) HW ELEV. * N-FAC DC DN TW DO DE HWO HWI ******************************************************************************* 1.48 0.76 279.45 * 0.012 0.52 0.32 1.11 1.11 0.52 ***** 0.76 1.96 0.92 279.61 * 0.012 0.60 0.37 1.46 1.46 0.60 ***** 0.92 CB 719 PIPE NO. 7: 94 LF - 12"CP @ 1.86% OUTLET: 278.74 INLET: 280.49 INTYP: 5 JUNC NO. 7: OVERFLOW-EL: 285.09 BEND: 90 DEG DIA/WIDTH: 3 .0 Q-RATIO: 0.20 Q(CFS) HW(FT) HW ELEV. * N-FAC DC DN TW DO DE HWO HWI ******************************************************************************* 1.48 0.76 281.25 * 0.012 0.52 0.36 0.76 0.76 0.52 ***** 0.76 1.96 0.93 281.42 * 0.012 0.60 0.42 0.92 0.92 0.60 ***** 0.93 CB 722 PIPE NO. 8: 107 LF - 12"CP @ 1.80% OUTLET: 280.49 INLET: 282.42 INTYP: 5 JUNC NO. 8: OVERFLOW-EL: 286.69 BEND: 2 DEG DIA/WIDTH: 3 .0 Q-RATIO: 0.78 Q(CFS) HW(FT) HW ELEV. * N-FAC DC DN TW DO DE HWO HWI ******************************************************************************* 1.23 0.66 283.54 * 0.012 0.47 0.32 0.76 0.76 0.47 ***** 0.66 1.64 0.78 283 .66 * 0.012 0.55 0.37 0.93 0.93 0.55 ***** 0.78 CB 724 PIPE NO. 9: 71 LF - 1211CP @ 1.80% OUTLET: 282 .42 INLET: 283 .70 INTYP: 5 JUNC NO. 9: OVERFLOW-EL: 287.72 BEND: 10 DEG DIA/WIDTH: 3 .0 Q-RATIO: 0.38 Q(CFS) HW(FT) HW ELEV. * N-FAC DC DN TW DO DE HWO HWI ******************************************************************************* 0.69 0.47 284 .17 * 0.012 0.35 0.28 0.66 0.66 0.35 ***** 0.47 0.92 0.55 284 .25 * 0.012 0.41 0.32 0.78 0.78 0.41 ***** 0.55 CB 725 PIPE NO. 10: 69 LF - 12"CP @ 1.14% OUTLET: 283 .70 INLET: 284 .49 INTYP: 5 JUNC NO.10: OVERFLOW-EL: 288.61 BEND: 10 DEG DIA/WIDTH: 3 .0 Q-RATIO: 0.75 Q(CFS) HW(FT) HW ELEV. * N-FAC DC DN TW DO DE HWO HWI ******************************************************************************* 0.50 0.40 284.89 * 0.012 0.30 0.24 0.47 0 .47 0.30 ***** 0.40 0.67 0 .46 284 .95 * 0.012 0.35 0.28 0.55 0.55 0.35 ***** 0.46 CB 727 PIPE NO. 11 : 112 LF - 1211CP @ 1.60% OUTLET: 284 .49 INLET: 286.28 INTYP: 5 JUNC NO. 11 : OVERFLOW-EL: 290.22 BEND: 10 DEG DIA/WIDTH: 3 .0 Q-RATIO: 0.52 Q(CFS) HW(FT) HW ELEV. * N-FAC DC DN TW DO DE HWO HWI ******************************************************************************* 0.29 0.29 286.58 * 0.012 0.23 0. 17 0.40 0.40 0.23 ***** - 0.29 0.38 0.33 286.62 * 0.012 0.26 0 . 19 0.46 0.46 0.26 ***** 0.33 Page 2 of 3 Model 4, Backwater Analysis Model 4, Backwater Analysis Cs 728 PIPE NO.12 : 34 LF - 8"CP @ 2 .00% OUTLET: 286.61 INLET: 287.29 INTYP: 5 Q(CFS) HW(FT) HW ELEV. * N-FAC DC DN TW DO DE HWO HWI ******************************************************************************* 0.19 0.27 287.56 * 0.012 0.20 0.15 0.00 0.15 0 .20 ***** 0.27 0.25 0.31 287.60 * 0.012 0.24 0.17 0.01 0.17 0 .24 ***** 0.31 Page 3 of 3 Model 4, Backwater Analysis