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03330 - Technical Information Report - Offsite BNSF Railroad Bypass Analysis
� 0 � � m Technical In formation Report for Barbee M i I I � Offsite BNSF Railroad Bypass Analysis . . . , . ,_ , , _ , �� Prepared for: Conner Homes 846 I 08th Avenue NE Bellevue,WA 98004 Prepared by: Otak,Inc. Ray Smalling,PE Daniel Moore,EIT �Np i� g,�,lq 10230 NE Poinu Drive,Suite 400 �� n�..,;,,SNj llr Kirkland,WA 98033 qs' ,�� �. , �'�'c Otak Project No.30788 ��' �• v� "!.�:;.. Z �._'. ;;�;z:���� .°� .. '2` i w� ��' ��`��s � ' Revised: October 3,2006 �ss� EN v� September 19, 2006 ��.lti EXPIRES c.r�•v�� -�-- -_T� �_. �..._.._. .:, .�._ :. _ , . ,. �. . . F ,... .:_.: ., _. - . ��� .._. . . ,... ., . ._ _ . . ..._ ....,_ � :_ ,,..� - . . . . _ �.... ._ __ _ . -� �'333C� Barbee Mill Offsite BNSF Railroad Bypass Analysis The Barbee I���ill project site is located west of Lake��G'ashington Boule�ard and south of I-405 and the 44�' Street interchange and adjacent to Lake`�'ashington. The offsite flo�vs to the proposed bppass s5�stem originate from a 15-inch concrete pipe from the southeast, and an 18-inch ductile iron pipe fr�m the south. There are five drainage basins contributing flo�v to the bypass system, as discussed belo�ti (see Figure 1). CurrendF, there is a 24-inch pipe��hich conve�rs offsite flo�vs across the southeastern corner of the Barbee I�iill project site. Proposed impro�-ements�vill Yemove the onsite porrion of this bypass pipe and replace it u7th 98 feet of 24-inch RGRCP fxom the sy stem inlet to CB 81 S and 233 feet of 30-inch RGRCP from CB 815 to the outfall,�vhich�vill then discharge to Lake Washington (see Figure 2). Future Conditions Offsite Basin at Lake Washington Boulevard (Basin A) The upstteam, offsite basin�vhich discharges to the 15-inch concrete pipe, consists of e�sting patcels and right-of-�vay (R.O.�XI.}areas bounded by Lake V�'ashington Boulevard to the�vest and I-405 to the east (see Figuxe 1). The Ciry Comprehensi�re Land Use Plan idenrifies the area as residential�L-ith a densit� of eight da�elling units per acxe (DU/acre). The corresponding percent impen-ious used for the Yesidential portion of this basin is assumed to be 58°'o as required in Table 3.22.D of the 1998 KCSWD�1. The basin areas were analvzed as follows: Offsite Basin A Area Offsite RO.W.Area Total Im ervious Total Pervious 28.43 Acres 6.25 Acres 22.74 Acres 11.94:�cres Offsite Basin Within BNSF R.O.W. (Basin B) The upstream, offsite basin�vhich discharges to the 18-inch ductile iron pipe, consists of areas��hich lie within the offsite BNSF R.O.W., and a portion of the�vestern half of Lake Vilashington Boulevard (see Figure 1). This basin was delineated based on two-foot contours supplied by LIDAR sun-ey data. T'he basin axeas were analy zed as follo�vs: Offsite Basin B Area Offsite R.O.W.Area Total Im ervious Total Pervious 0.47 rlcres 0.31 Acres 031 Acres 0.47 Acres Barbee lfi !! OJJrite B :�7SF By-pa ; � Anal}' JZJ 1 October 03 , 2006 otak K:Aproject\307f�\30788\KePorG�\TTR\BNSf Bypass1 CH13116\TeYt.doc Barbee M i I I Offsite BNSF Railroad Bypass Analysis Onsite Basin Street C (Basin C) In addirion to offsite flo�vs, onsite drainage v��ill be conve�-ed through the bypass s5�stem. Onsite flo�is generated b}-the unper��ious lot areas along street C,a-hich are connected to the proposed roof drain s�stem (see Figure 3). The roof drain system connects to the proposed by-pass system onsite, at CB 820. The four-plex lots were assumed to be 85% impenrious,with the roof drains con�rej-ing only the imper�7ous site area. The basin area for this roof drain s�-stem is as folloa-s: Onsite Basin C Area Onsite R.O.W.Area Total Im ervious Total Pen-ious 0.93 Acres 0 Acres 0.79 Acres 0 Acres Onsite Basin—Lot I 15 (Basin D) Flo�vs generated from the southernmost parcel of the site (Lot 115) flow direcdy to CB 809 located at the northwest comer of the lot (see Figute 3).The flo���s from this parcel are as follows: Basin D Area Onsite R.O.W.Area Total Im ervious Total Pervious I 0.06 Acres 0 Acres 0.03 Acres 0.03!�cres Onsite Basin—Water quality facility located within Tract G (WQ2) (Basin E) Flo�vs to this basin consist of the outfall from the south�vater quality pond�vhich residcs �vithin Tract G. These flows originate from 15% of the parcel areas along Street C, and the R.O.W areas of both Streets C and D.The outfall fot the water quality pond connects to the b��ass s�stem at CB 805.The contributing areas to this basin are as follo�vs: Basin E Area Onsite R.O.W.Area Total Im ervious Total Pervious 0.93 r,cres 0.85 r'lcres 0.99 Acres 0 Acres Proposed Drainage System ?� backwater analy�sis was conducted for the proposed b}rpass line using StormShed hydraulic modeling software. The storm�vater conve�ance s�stem was tested for both the 25 and 100 j�ear storm events. BarGze :l�lil/ O /�j.rrte B \� SF By�pa � � �4na !_y� .rir 2 October 03 , 2006 otak K:\Project\307(x)\30788\Reports\TIR\BNSIBtpass 11K�i0G\Textdoc Barbee Mill Offsite BNSF Railroad Bypass Analysis Hydrology The proposed bypass line has been sized to convey the 25 and 100-cear peak flows. The flo�vs to each storm«�ater structure�vere calculated using StonnShed, �vhich utilizes the SI3L'H mcthod. The calculated Yainfall intensih-is based on the 100-�-ear precipitation and a titne of concentration for runoff in contributing area. At the Barbee I�1ill site,the 2�-year and 1 UO- �-ear 24-hour precipitarion is 2.0 and 3.9 inches, respecri�el�r. The time of concentrarion ('I'c) �vas analyzed using StormShed based on the cover, flo�v length,and basin slope. Offsite Basin A In computing tlie offsite drainage flo�as, a"CN"value of 86 a-as used for percious parcel areas and a�alue of 98�vas used for impervious areas. The time of concenttation (Tc) for the reach secrion which runs through the xesidenrial parcels was calculated b�� StormShed to be 20.59 minutes, considering 300 feet of sheet flow and 480 feet of shallow flo�v at 7.2°-'0 slope. The Tc for the pipe reach section of the basin�vas deterinined to be 2.81 minutes for 1,880 feet of 12-inch pipe flo�ving full at a slope of 5°-�. Offsite Basin B � A "CN" value of 86«-as used for the BNSF R.O.��'. area, and a��alue of 98�vas used for imper�-ious area�vithin the Lake�}ilashington Blvd. R.O.W. The Tc far the BNSF R.O.��'. area was calculated b�- StormShed to be 20.05 minutes, considering 45 feet of sheet flow at 32% slope, and 450 feet of shallow flo�v at 2.66% slope. The Tc for the Lake Washington R.O.�X1. area was considered to sheet flow across the R.O.W. at a slope of 2%,resulting in a Tc of 0.57 minutes. Onsite Basin C The four-ple�:lots w�exe assumed to be 85°%impervious and 15%pennious. T'his basin area has a Tc of 2.12 minutes, resulting from 559 feet of 6-inch pipe flo�v at a slope of 2%. Onsite Basin D This parcel area is assumed to be 65% impervious. The Tc for this basin consists of 50 feet � of sheet flow at 5°% for a smooth surface, and 5(1 fcet <>f la«-n shect fl<��iT at 5°���. The tesulting Z'c for this basin is 5.54 minutes. Barl� ee .'l1i /l Oj:J� ite BV�SF By� � r .r Ana !}� ri � 3 October 03 , 2006 otak K:\projed\30700\30788\Reports\TIR\BNSFf3t�ass 10030G\,'I'ext.doc i Barbee Mill Offsite BNSF Railroad Bypass Analysis Onsite Basin E The peak flow discharge from this basin was calculated to be 0.84 cfs, and was obtained from an onsite StormShed model of the con�eyance sjrstem R-hich flours to the water qualin- pond located on the southern portion of the site (WQ2). Hydraulics �, The storm drain system for the bSTpass line was analyzed using the StormShed program. StormShed accounts for inlet and outlet control condirions, incluciing minor losses for friction,junctions, and bends.The taila-ater condition for this sj-stem discharges freel�-to Lake���ashington. The back�-ater analj�sis for the proposed bypass system was conducted using StormShed, �vhich compares head�vater elecation at each catch basin�vith its corresponding rim elevation. The Stormshed anal�-sis for this bypass system is included in Appendix A. Onsite Basin D CB's 808 and 809 overtop due to the HGL generated within CB 807 for both the 25 and 100 y ear stoxm events. Therefore a flap gate��-ill be installed on CB 807 to prevent backup in CB's 808 and 809. Summary The proposed conveyance system successfullv con�-eys both the 25 and 100 year storm eeents without an�-overtopping occurring within the system. B a rb e e .11 i l/ O j fr i t e B NS F B ti�p u � r �3 n a ly� rr � �} October 03 , 200G otak K-'',,�roifet\3(170(1\30788\Repnrt.ATIR\BNSI�R�T�.i>.i(�30G\Test.doc � N L � b�0 � ::`:�15T.= B ARB EE MILL �,.�a�. , R.,o,.� °'�tl;y° Offsite BNSF Railroad By-pass Basin Exhibit: Figure 1 (17A1:N0iF S/NHY'�:U C1tltlIt�U / I�� lYi c'98Ga32 ' . . � / . . "'AflR770 � � /:�.J i �: ./tlHHS00 / / . . r�98H430 I S � �� /�/ � / � � �ieanaoi � � J�� ,� ��i ��:'BBN460 � �' � � E,AJ205D . -� I� i �I� '�� � PnRCELS ' � � � '� . ,� . 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O ._"____. - __ i m / I T _ / R / __" ( � i 'i 3,DZ5- � � • I � '� _ � �.._. 3,D -7 3,D6- �---=' �> � �"'' ;. _ -- , � � � 3,C6 11 3,C6-1 , 3,C -9 3,C6-8 3,C6-7 �, 6-1 ,D6 10 0' 60' 120' 240' ' ",�;"°'`'� E _ 3,D6-6 _ 3��_� � -. _ � '.n:�fi).1E Points Unve NiOU 214IE:THIS PUN 5 CONCEPTUAL BUILDINGS, LOT 3 D6- 3�DGr4 � � ' Nirklnnd, Meshmglon 98033 uwim,wo i►�aove�rrs sr�owN u� � 2`'.- , 3,D - 3,D -3 3 6'-2 6_ � Phane (�z�) 822-4448 REPRESENiATNE OF THE iYPES OF DEVELOPMENT hUT r f enx. (aza) nzv-uarr IS PROPOSED. BllT IN M057 GSES.1HEY HAVF NOT i� I ����I,�-� � I � ., .', � � � �I-1----� � I�itrrnet�. NWM.Otek.l:UM " BEEN DESIGNED OR CONSTRUCTED. THE FINAL PUW I I I MAY DIFFER FROA1 TNIS CONCEPTUAL PLAN. 7HE r�/�/� � DEVELOPER RESERVES THE RIGHT TO IMKE CWWGES October 03� LVV6 z AS THE PUN IS FlNALRED AN� IMPLEMENTED. 4 Offsite BNSF Railroad By-pass Basin Exhibit: Figure 1 _ �ST B ARB EE MILL .;__ ���___ BNSF By-Pass Exhibit: Figure 2 'e"B•�3� • . � � � / . - . 70 � . . , ..� �:. . : / . . . �00 .. ....-. •, ___ ` .�....dOD � � � �+_�_�� . �. �'/- . -._.�p �' � .' �� .' ' ' `s'}/ A� � rf // , � '67T�30 � !' - �{ . . �'1 C�;% 4�IiBEA QP"�C . 'BBU6t0 _. . ' /�� - . .. . . . . /� - � f/� . 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'� � ^�9 �J � �fl1p,'s.c -.. , � x���� � N g�-�a ` g ����s w � . - � } b � Appendix A — Hydraulic Analysis of BNSF Offsite Bypass System StormShed Report Monday,October 09,2006 Project:OFFSITE_BYPASS_BNSF_092806 Page 1 25 yr Storm Event: Project Precips [2 yr] 2.00 in [5 yr] 2.50 in [10 yr] 2.90 in [25 yr] 3.40 in [100 yr] 3.90 in [Other] 1.27 in Reach Records Reach ID: INLET PIPE Section Properties: Shape: Circular Routing Method: Travel Time Translation Size Material Mannings n Hyd params By 24" Diam Conc-Steel Form 0.0110 Mannings Formula Length Slope Entrance Loss 13.0000 ft 8.08 % Groove End Projecting Diam 2.0000 ft Up Node Dn Node Up Invert Dn Invert INLET CB 820 26.0004 ft 24.9500 ft Conduit Constraints: Min Vel Max Vel Min Cov Min Slope Max Slope Min drop 2.0000 ft 15.0000 ft 3.0000 ft 0.5000 ft 2.0000 ft 0.0000 ft In/Exfil Hold Up Hold Dn Match Inv Allow Smaller 0.0000 in/hr NO NO YES NO Conduit Summary: , Trib Area Flow Capacity Velocity Normal Depth I 35.4600 ac 22.5257 cf 76.9004 cf 21.2578 ft/s 0.7415 ft Ent Loss Exit Loss Frict Loss Start TW 0.159661 ft 0.798306 ft 0.090103 ft 27.9017 ft Reach ID: P-804 Section Properties: Shape: Circular Routing Method: Travel Time Translation Size Material Mannings n Hyd params By 30" Diam Conc-Steel Form 0.0110 Mannings Formula Length Slope Entrance Loss 6.0000 ft 0.26 % Square Edge w/Headwall Diam 2.5000 ft Up Node Dn Node Up Invert Dn Invert CB 804 OUTLET 18.6156 ft 18.6000 ft Conduit Constraints: Min Vel Max Vel Min Cov Min Slope Max Slope Min drop 2.Q000 ft 15.0000 ft 3.0000 ft 0.5000 ft 2.0000 ft 0.0000 ft In/Exfil Hold Up Hold Dn Match Inv Allow Smaller 0.0000 in/hr NO NO YES NO Conduit Summary: Trib Area Flow Capacity Velocity Normal Depth 36.3200 ac 23.9170 cf 25.0113 cf 5.8009 ft/s 1.9572 ft Ent Loss Exit Loss Frict Loss Start TW 0.261262 ft 0.522524 ft 0.014261 ft 20.5572 ft StormShed Report Monday,October 09,2006 Project:OFFSITE BYPASS BNSF 092806 Page 2 comment: Hydrograph not shifted, 0.78 min forwarded.Submerged or overtop bank condition. Reach ID: P-805 Section Properties: Shape: Circular Routing Method: Travel Time Translation Size Material Mannings n Hyd params By 30" Diam Conc-Steel Form 0.0110 Mannings Formula Length Slope Entrance Loss 66.0000 ft 0.26 % Square Edge w/Headwall Diam 2.5000 ft Up Node Dn Node Up Invert Dn Invert CB 805 CB 804 18.7876 ft 18.6160 ft Conduit Constraints: Min Vel Max Vel Min Cov Min Slope Max Slope Min drop 2.0000 ft 15.0000 ft 3.0000 ft 0.5000 ft 2.0000 ft 0.0000 ft In/Exfil Hold Up Hold Dn Match Inv Allow Smaller 0.0000 in/hr NO NO YES NO Conduit Summary: Trib Area Flow Capacity Velocity Normal Depth 36.3200 ac 23.9170 cf 25.0113 cf 5.8009 ft/s 1.9572 ft Ent Loss Exit Loss Frict Loss Start TW 0.184314 ft 0.368628 ft 0.156871 ft 21.4844 ft comment: Hydrograph not shifted, 0.76 min forwarded.Submerged or overtop bank condition. Reach ID: P-807 Section Properties: Shape: Circular Routing Method: Travel Time Translation Size Material Mannings n Hyd params By 30" Diam Conc-Steel Form 0.0110 Mannings Formula , Length Slope Entrance Loss 40.0000 ft 0.26 % Square Edge w/Headwall Diam 2.5000 ft Up Node Dn Node Up Invert Dn Invert CB-807 CB 805 18.8940 ft 18.7900 ft Conduit Constraints: � Min Vel Max Vel Min Cov Min Slope Max Slope Min drop 2.0000 ft 15.0000 ft 3.0000 ft 0.5000 ft 2.0000 ft 0.0000 ft � In/Exfil Hold Up Hold Dn Match Inv Allow Smaller I� 0.0000 in/hr NO NO YES NO Conduit Summary: i Trib Area Flow Capacity Velocity Normal Depth 36.3200 ac 23.2271 cf 25.0113 cf 5.7867 ft/s 1.9052 ft Ent Loss Exit Loss Frict Loss Start TW 0.173834 ft 0.347669 ft 0.089668 ft 21.8534 ft comment: Hydrograph not shifted,0.57 min fonnrarded.Submerged or overtop bank condition. Reach ID: P-808 Section Properties: Shape: Circular Routing Method: Travel Time Translation Size Material Mannings n Hyd params By StormShed Report Monday,October 09,2006 Project:OFFSITE BYPASS BNSF_092806 Page 3 8" Diam Cast-Iron, New 0.0120 Mannings Formula Length Slope Entrance Loss 8.0000 ft 0.50 °/o Square Edge w/Headwall Diam 0.6667 ft Up Node Dn Node Up Invert Dn Invert CB 808 CB-807 18.3500 ft 18.3100 ft Conduit Constraints: Min Vel Max Vel Min Cov Min Slope Max Slope Min drop 2.0000 ft 15.0000 ft 3.0000 ft 0.5000 ft 2.0000 ft 0.0000 ft In/Exfil Hold Up Hold Dn Match Inv Allow Smaller 0.0000 in/hr NO NO YES NO Conduit Summary: Trib Area Flow Capacity Velocity Normal Depth 0.0600 ac 0.0379 cf 0.9282 cf 1.3064 ft/s 0.0918 ft Ent Loss Exit Loss Frict Loss Start TVV 0.000091 ft 0.000183 ft 0.000067 ft 22.1208 ft Reach ID: P-809 Section Properties: Shape: Circular Routing Method: Travel Time Translation Size Material Mannings n Hyd params By 8" Diam Cast-Iron, New 0.0120 Mannings Formula Length Slope Entrance Loss 11.0000 ft 0.50 % Square Edge wlHeadwall Diam 0.6667 ft Up Node Dn Node Up Invert Dn Invert CB 809 CB 808 18.4000 ft 18.3450 ft Conduit Constraints: Min Vel Max Vel Min Cov Min Slope Max Slope Min drop 2.0000 ft 15.0000 ft 3.0000 ft 0.5000 ft 2.0000 ft 0.0000 ft In/Exfil Hold Up Hold Dn Match Inv Allow Smaller 0.0000 in/hr NO NO YES NO Conduit Summary: Trib Area Flow Capacity Velocity Normal Depth 0.0600 ac 0.0379 cf 0.9282 cf 1.3064 ft/s 0.0918 ft Ent Loss Exit Loss Frict Loss Start TVI! � 0.000091 ft 0.000183 ft 0.000092 ft 21.2900 ft Reach ID: P-810 Section Properties: Shape: Circular Routing Method: Travel Time Translation Size Material Mannings n Hyd params By 30" Diam Conc-Steel Form 0.0110 Mannings Formula Length Slope Entrance Loss 40.0000 ft 0.26 % Square Edge w/Headwall Diam 2.5000 ft Up Node Dn Node Up Invert Dn Invert CB 810 CB-807 18.9980 ft 18.8940 ft Conduit Constraints: Min Vel Max Vel Min Cov Min Slope Max Slope Min drop 2.0000 ft 15.0000 ft 3.0000 ft 0.5000 ft 2.0000 ft 0.0000 ft In/E�I Hold Up Hold Dn Match Inv Allow Smaller StormShed Report Monday,October 09,2006 Project:OFFSITE_BYPASS_BNSF_092806 Page 4 0.0000 in/hr NO NO YES NO Conduit Summary: Trib Area Flow Capacity Velocity Normal Depth 36.2600 ac 23.1893 cf 25.0113 cf 5.7858 ft/s 1.9024 ft Ent Loss Exit Loss Frict Loss Start TW 0.173268 ft 0.346536 ft 0.089376 ft 22.1208 ft comment: Hydrograph not shifted, 0.45 min forwarded.Submerged or overtop bank condition. Reach ID: P-815 Section Properties: Shape: Circular Routing Method: Travei Time Translation Size Material Mannings n Hyd params By 30" Diam Conc-Steel Form 0.0110 Mannings Formula Length Slope Entrance Loss 81.0000 ft 0.26 % Square Edge w/Headwall Diam 2.5000 ft Up Node Dn Node Up Invert Dn Invert CB 815 CB 810 19.2086 ft 18.9980 ft Conduit Constraints: Min Vel Max Vel Min Cov Min Slope Max Slope Min drop 2.0000 ft 15.0000 ft 3.0000 ft 0.5000 ft 2.0000 ft 0.0000 ft In/Exfil Hold Up Hold Dn Match Inv Allow Smaller 0.0000 in/hr NO NO YES NO Conduit Summary: Trib Area Flow Capacity Velocity Normal Depth 36.2600 ac 23.1893 cf 25.0113 cf 5.7858 ft/s 1.9024 ft Ent Loss Exit Loss Frict Loss Start TVV 0.173268 ft 0.346536 ft 0.180985 ft 22.6298 ft comment: Hydrograph not shifted, 0.33 min forwarded.Submerged or overtop bank condition. Reach ID: P-820 Section Properties: Shape: Circular Routing Method: Travel Time Translation Size Material Mannings n Hyd params By 24" Diam Conc-Steel Form 0.0110 Mannings Formula Length Slope Entrance Loss 85.0000 ft 5.38 % Square Edge w/Headwall Diam 2.0000 ft Up Node Dn Node Up Invert Dn Invert CB 820 CB 815 24.4470 ft 19.8740 ft Conduit Constraints: Min Vel Max Vel Min Cov Min Slope Max Slope Min drop 2.0000 ft 15.0000 ft 3.0000 ft 0.5000 ft 2.0000 ft 0.0000 ft In/Exfil Hold Up Hold Dn Match Inv Allow Smaller 0.0000 in/hr NO NO YES NO Conduit Summary: Trib Area Flow Capacity Velocity Normal Depth 36.2600 ac 23.1893 cf 62.7500 cf 18.4707 ft/s 0.8417 ft Ent Loss Exit Loss Frict Loss Start TW 0.423017 ft 0.846034 ft 0.624354 ft 23.3305 ft StormShed Report Monday,October 09,2006 Project:OFFSITE_BYPASS_BNSF 092806 Page 5 Node Records Node ID: CB 804 Desc: Manhole structure Start EI: 18.6100 ft Max EI: 23.5400 ft Contrib Basin: Contrib Hyd: Hgl Elev: 21.4844 ft Struct Type: CB-TYPE 2-60 Classification Catch Basin Ke Descrip: CONC: Headwall: square edge;.ke=0.5 Catch Depth: 2.0000 ft Bot Area: 19.6340 sf Condition: No particular shape. Status: Proposed Structure Approach Credit: 0.3686 ft Node ID: CB 805 Desc: Manhole structure Start EI: 18.7900 ft Max EI: 23.7100 ft Contrib Basin: Contrib Hyd: WQ2_OUT_25 Hgl Elev: 21.8534 ft Struct Type: CB-TYPE 2-60 Classification Catch Basin Ke Descrip: CONC: Headwall: square edge;.ke=0.5 Catch Depth: 2.0000 ft Bot Area: 19.6340 sf Condition: No particular shape. Status: Proposed Structure Approach Credit: 0.3477 ft Node ID: CB 808 Desc: Manhole structure Start EI: 18.3500 ft Max EI: 21.1900 f• Contrib Basin: Contrib Hyd: Hgl Elev: 21.2900 ft Struct Type: CB-TYPE 2-54 Classification Catch E Ke Descrip: CONC: Headwall: square edge;.ke=0.5 Catch Depth: 2.0000 ft Bot Area: 15.9040 sf Condition: No particular shape. Status Proposed �� . Approach Credit: 0.0002 ft Node ID: CB 809 Desc: Manhole structure Start EI: 18.4000 ft Max EI: 20.7000 ft Contrib Basin: B-809 Contrib Hyd: Hgl Elev: 20.8000 ft i Struct Type: CB-TYPE 1 Classification Catch Basin Ke Descrip: CONC: Headwall: square edge;.ke=0.5 Catch Depth: 1.4160 ft Bot Area: 3.9700 sf Condition: No particular shape. Status: Proposed Structure Approach Credit: 0.0000 ft Node ID: CB 810 Desc: Manhole structure Start EI: 18.9980 ft Max EI: 23.8800 ft Contrib Basin: Contrib Hyd: Hgl Elev: 22.6298 ft Struct Type: CB-TYPE 2-54 Classification Catch Basin Ke Descrip: CONC: Headwall: square edge;.ke=0.5 Catch Depth: 2.0000 ft Bot Area: 15.9040 sf StormShed Report Monday,October 09,2006 Project:OFFSITE_BYPASS_BNSF_092806 Page 6 Condition: No particular shape. Status: Proposed Structure Approach Credit: 0.3465 ft Node ID: CB 815 Desc: Manhole structure Start EI: 19.2100 ft Max EI: 25.4000 ft Contrib Basin: Contrib Hyd: Hgl Elev: 23.3305 ft Struct Type: CB-TYPE 2-60 Classification Catch Basin Ke Descrip: CONC: Headwall: square edge;.ke=0.5 Catch Depth: 2.0000 ft Bot Area: 19.6340 sf Condition: No particular shape. Status: Proposed Structure Approach Credit: 0.0000 ft Node ID: CB 820 Desc: Manhole structure Start EI: 24.9500 ft Max EI: 29.6100 ft Contrib Basin: B-820 Contrib Hyd: Hgl Elev: 27.9017 ft Struct Type: CB-TYPE 2-54 Classification Catch Basin Ke Descrip: CONC: Headwall: square edge;.ke=0.5 Catch Depth: 2.0000 ft Bot Area: 15.9040 sf Condition: No particular shape. Status: Proposed Structure Approach Credit: 0.0000 ft Node ID: CB-807 Desc: Manhole structure Start EI: 18.8940 ft Max EI: 23.7700 ft Contrib Basin: Contrib Hyd: Hgl Elev: 22.1208 ft Struct Type: CB-TYPE 2-54 Classification Catch Basin Ke Descrip: CONC: Headwall: square edge;.ke=0.5 Catch Depth: 2.0000 ft Bot Area: 15.904C sf Condition: No particular shape. Status: Proposed Structure Approach Credit: 0.3465 ft Bend Loss: 0.0022 ft Junction Loss: 0.0005 ft Node ID: INLET Desc: Manhole structure Start EI: 26.0000 ft Max EI: 108.0000 ft Contrib Basin: Contrib Hyd: B-002 + B-001 25yr Hgl Elev: 28.9498 ft Node ID: OUTLET Desc: Manhole structure Start EI: 18.6000 ft Max EI: 101.0000 ft Contrib Basin: Contrib Hyd: Hgl Elev: 18.6000 ft _ . ._.__._.__ ._._ .. .. I StormShed Report Monday,October 09,2006 ' Project:OFFSITE BYPASS BNSF 092806 Page 7 � Contributing Drainage Areas Drainage Area: B-809 Hyd Method: SBUH Hyd Loss Method: SCS CN Number � Peak Factor: 484.00 SCS Abs: 0.20 Storm Dur: 24.00 hrs Intv: 10.00 min � Area CN TC Pervious 0.0300 ac 86.00 0.08 hrs Impervious 0.0300 ac 98.00 0.01 hrs Total 0.0600 ac Supporting Data: Pervious CN Data: None Entered 86.00 0.0300 ac Impervious CN Data: None Entered 98.00 0.0300 ac Pervious TC Data: Flow type: Description: Length: Slope: Coeff: Travel Time Sheet None Entered 50.00 ft 5.00% 0.1500 4.93 min Impervious TC Data: Flow type: Description: Length: Slope: Coeff: Travel Time Sheet None Entered 50.00 ft 5.00% 0.0110 0.61 min Drainage Area: B-820 Hyd Method: SBUH Hyd Loss Method: SCS CN Number Peak Factor: 484.00 SCS Abs: 0.20 Storm Dur: 24.00 hrs Intv: 10.00 min Area CN TC Pervious 0.0000 ac 78.00 0.00 hrs Impervious 0.8000 ac 98.00 0.04 hrs Total 0.8000 ac Supporting Data: Impervious CN Data: None Entered 98.00 0.8000 ac Impervious TC Data: Flow type: Description: Length: Slope: Coeff: Travel Time Fixed None Entered 0.00 ft 0.00% 2.1200 2.12 min StormShed Report Monday,October 09,2006 Project:OFFSITE BYPASS BNSF 092806 Page 9 Hydrograph ID: OUTLET - 25 yr Area: 36.3200 ac Hyd Int: 10.00 min Base Flow: Pending tt translation: 0.76 min Peak Flow: 23.9170 cfs Peak Time: 7.83 hrs Hyd Vol: 8.6354 acft Time Flow Time Flow Time Flow hr cfs hr cfs hr cfs 0.67 0.0203 9.50 7.2098 18.17 3.2692 0.83 0.1711 9.67 6.7003 18.33 3.1690 1.00 0.3946 9.83 6.3856 18.50 3.1768 1.17 0.6481 10.00 6.3794 18.67 3.1628 1.33 0.8855 10.17 5.9731 18.83 3.1607 1.50 1.0452 10.33 5.6683 19.00 3.1579 1.67 1.2491 10.50 5.6885 19.17 3.0348 1.83 1.4206 1�.67 5.4050 19.33 2.9340 2.00 1.5274 10.83 5.2056 19.50 2.9414 2.17 1.7017 11.�0 5.2157 19.67 2.9271 2.33 1.8446 11.17 5.0690 19.83 2.9247 2.50 1.9148 11.33 4.9674 20.00 2.9216 2.67 1.9901 11.50 4.9733 20.17 2.9209 2.83 2.0515 11.67 4.8397 20.33 2.9204 3.00 2.1065 11.83 4.7417 20.50 2.9207 3.17 2.1545 12.00 4.7499 20.67 2.9211 3.33 2.1973 12.17 4.6176 20.83 2.9218 3.50 2.2352 12.33 4.5193 21.00 2.9226 3.67 2.3679 12.50 4.5277 21.17 2.9234 3.83 2.4842 12.67 4.3945 21.33 2.9242 4.00 2.521� 12.83 4.2957 21.50 2.9251 4.17 2.7735 13.00 4.3032 21.67 2.9259 4.33 2.9711 13.17 4.2909 21.83 2.9268 4.50 2_9983 13.33 4.2902 22.00 2.9277 4.67 3.2696 13.50 4.2896 22.17 2.8056 4.83 3.4762 13.67 4.1694 22.33 2.7054 5.00 3.5068 13.83 4.0722 22.50 2.7129 5.17 3.7875 14.00 4.0824 22.67 2.6986 � 5.33 4.0018 14.17 4.0706 22.83 2.6960 5.50 4.0341 14.33 4.0703 23.00 2.6929 5.67 4.3221 14.50 4.0695 23.17 2.6919 5.83 4.5426 14.67 3.9489 23.33 2.6913 6.00 4.5761 14.83 3.8508 23.50 2.6913 6.17 5.0874 15.00 3.8603 23.67 2.6915 6.33 5.4819 15.17 3.8479 23.83 2.6919 6.50 5.4936 15.33 3.8471 24.00 2.6924 6.67 6.2614 15.50 3.8457 24.17 1.3390 6.83 6.8462 15.67 3.7243 24.33 0.4074 7.00 6.8489 15.83 3.6254 24.50 0.2454 7.17 7.7772 16.00 3.6343 24.67 0.1495 7.33 8.4800 16.17 3.6213 24.83 0.0910 7.50 8.4929 16.33 3.6200 25.00 0.0554 7.67 17.0736 16.50 3.6180 25.17 0.0337 7.83 23.9170 16.67 3.6183 25.33 0.0206 8.00 23.4307 16.83 3.6188 25.50 0.0125 8.17 17.5372 17.00 3.6201 25.67 0.0076 8.33 12.2486 17.17 3.4990 25.83 0.0046 8.50 13.2234 17.33 3.4004 26.00 0.0027 8.67 10.8800 17.50 3.4090 26.17 0.0017 8.83 9.4887 17.67 3.3959 26.33 0.0010 9.00 9.5444 17.83 3.3942 26.50 0.0006 9.17 8.1615 15.00 3.3919 26.67 0.0004 9.33 7.1520 18.17 3.2692 26.83 0.0002 ■ StormShed Report Monday,October 09,2006 Project:OFFSITE BYPASS BNSF 092806 Page 1 100 yr Storm Event: Project Precips [2 yr] 2.00 in [5 yr] 2.50 in [10 yr] 2.90 in [25 yr] 3.40 in [100 yr] 3.90 in [Other] 1.27 in Reach Records Reach ID: INLET PIPE Section Properties: Shape: Circular Routing Method: Travel Time Translation Size Material Mannings n Hyd params By 24" Diam Conc-Steel Form 0.0110 Mannings Formula Length Slope Entrance Loss 13.0000 ft 8.08 % Groove End Projecting Diam 2.0000 ft Up Node Dn Node Up Invert Dn Invert INLET CB 820 26.0004 ft 24.9500 ft Conduit Constraints: Min Vel Max Vel Min Cov Min Slope Max Slope Min drop 2.0000 ft 15.0000 ft 3.0000 ft 0.5000 ft 2.0000 ft 0.0000 ft In/Exfil Hold Up Hold Dn Match Inv Allow Smaller 0.0000 in/hr NO NO YES NO Conduit Summary: Trib Area Flow Capacity Velocity Normal Depth 35.4600 ac 26.3716 cf 76.9004 cf 22.1877 fUs 0.8077 ft Ent Loss Exit Loss Frict Loss Start TW 0.218835 ft 1.094173 ft 0.123496 ft 28.7028 ft Reach ID: P-804 Section Properties: Shape: Circular Routing Method: Travel Time Translation Size Material Mannings n Hyd params By 30" Diam Conc-Steel Form 0.0110 Mannings Formula Length Slope Entrance Loss 6.0000 ft 0.26 °/a Square Edge w/Headwall Diam 2.5000 ft Up Node Dn Node Up Invert Dn Invert CB 804 OUTLET 18.6156 ft 18.6000 ft Conduit Constraints: Min Vel Max Vel Min Cov Min Slope Max Slope Min drop 2.0000 ft 15.0000 ft 3.0000 ft 0.5000 ft 2.0000 ft 0.0000 ft In/Exfil Hold Up Hold Dn Match Inv Allow Smaller 0.0000 in/hr NO NO YES NO Conduit Summary: Trib Area Flow Capacity Velocity Normal Depth 36.3200 ac 27.9819 cf 25.0113 cf 5.7004 ft/s -1.0000 ft Ent Loss Exit Loss Frict Loss Start TW 0.252288 ft 0.504577 ft 0.019520 ft 21.1000 ft , StormShed Report Monday,October 09,2006 Project:OFFSITE BYPASS BNSF 092806 Page 2 comment: Hydrograph not shifted, 0.78 min forwarded.Submerged or overtop bank condition. Reach ID: P-805 Section Properties: Shape: Circular Routing Method: Travel Time Translation Size Material Mannings n Hyd params By 30" Diam Conc-Steel Form 0.0110 Mannings Formula Length Slope Entrance Loss 66.0000 ft 0.26 °/a Square Edge w/Headwall Diam 2.5000 ft Up Node Dn Node Up Invert Dn Invert CB 805 CB 804 18.7876 ft 18.6160 ft Conduit Constraints: Min Vel Max Vel Min Cov Min Slope Max Slope Min drop 2.0000 ft 15.0000 ft 3.0000 ft 0.5000 ft 2.0000 ft 0.0000 ft In/Exfil Hold Up Hold Dn Match Inv Allow Smaller 0.0000 in/hr NO NO YES NO Conduit Summary: Trib Area Flow Capacity Velocity Normal Depth 36.3200 ac 27.9819 cf 25.0113 cf 5.7004 ft/s -1.0000 ft Ent Loss Exit Loss Frict Loss Start TW 0.252288 ft 0.504577 ft 0.214725 ft 22.0512 ft comment: Hydrograph not shifted, 0.76 min forwarded.Submerged or overtop bank condition. Reach ID: P-807 Section Properties: Shape: Circular Routing Method: Travel Time Translation Size Material Mannings n Hyd params By 30" Diam Conc-Steel Form 0.0110 Mannings Formula Length Slope Entrance Loss 40.0000 ft 0.26 % Square Edge w/Headwall Diam 2.5000 ft Up Node Dn Node Up Invert Dn Invert CB-807 CB 805 18.8940 ft 18.7900 ft Conduit Constraints: Min Vel Max Vel Min Cov Min Slope Max Slope Min drop 2.0000 ft 15.0000 ft 3.0000 ft 0.5000 ft 2.0000 ft 0.0000 ft In/Exfil Hold Up Hold Dn Match Inv Allow Smaller 0.0000 in/hr NO NO YES NO Conduit Summary: Trib Area Flow Capacity Velocity Normal Depth 36.3200 ac 27.1816 cf 25.0113 cf 5.5374 ft/s -1.0000 ft Ent Loss Exit Loss Frict Loss Start TW 0.238064 ft 0.476127 ft 0.122799 ft 22.5562 ft comment: Hydrograph not shifted, 0.57 min forwarded.Submerged or overtop bank condition. Reach ID: P-808 Section Properties: Shape: Circular Routing Method: Travel Time Translation ■ Size Material Mannings n Hyd params By StormShed Report Monday, October 09,2006 Project:OFFSITE_BYPASS_BNSF 092806 Page 3 8" Diam Cast-Iron, New 0.0120 Mannings Formula Length Slope Entrance Loss 8.0000 ft 0.50 % Square Edge w/Headwall Diam 0.6667 ft Up Node Dn Node Up Invert Dn Invert CB 808 CB-807 18.3500 ft 18.3100 ft Conduit Constraints: Min Vel Max Vel Min Cov Min Slope Max Slope Min drop 2.0000 ft 15.0000 ft 3.0000 ft 0.5000 ft 2.0000 ft 0.0000 ft In/Exfil Hold Up Hold Dn Match Inv Allow Smaller 0.0000 inlhr NO NO YES NO Conduit Summary: Trib Area Flow Capacity Velocity Normal Depth 0.0600 ac 0.0451 cf 0.9282 cf 1.3736 ftls 0.0999 ft Ent Loss Exit Loss Frict Loss Start TW 0.000129 ft 0.000259 ft 0.000094 ft 22.9223 ft Reach ID: P-809 Section Properties: Shape: Circular Routing Method: Travel Time Translation Size Material Mannings n Hyd params By 8" Diam Cast-Iron, New 0.0120 Mannings Formula Length Slope Entrance Loss 11.0000 ft 0.50 % Square Edge w/Headwall Diam 0.6667 ft Up Node Dn Node Up Invert Dn Invert CB 809 CB 808 18.4000 ft 18.3450 ft Conduit Constraints: Min Vel Max Vel Min Cov Min Slope Max Slope Min drop 2.0000 ft 15.0000 ft 3.0000 ft 0.5000 ft 2.0000 ft 0.0000 ft In/Exfil Hold Up Hold Dn Match Inv Allow Smaller 0.0000 in/hr NO NO YES NO Conduit Summary: Trib Area Flow Capacity Velocity Normal Depth 0.0600 ac 0.0451 cf 0.9282 cf 1.3736 ft/s 0.0999 ft Ent Loss Exit Loss Frict Loss Start TW 0.000129 ft 0.000259 ft 0.000130 ft 21.2900 ft Reach ID: P-810 Section Properties: Shape: Circular Routing Method: Travel Time Translation Size Material Mannings n Hyd params By 30" Diam Conc-Steel Form 0.0110 Mannings Formula Length Slope Entrance Loss 40.0000 ft 0.26% Square Edge w/Headwall Diam 2.5000 ft Up Node Dn Node Up Invert Dn Inve�t CB 810 CB-807 18.9980 ft 18.8940 ft Conduit Constraints: Min Vel Max Vel Min Cov Min Slope Max Slope Min drop 2.0000 ft 15.0000 ft 3.0000 ft 0.5000 ft 2.0000 ft 0.0000 ft In/Exfil Hold Up Hold Dn Match Inv Allow Smaller StoRnShed Report Monday,October 09,2006 Project:OFFSITE_BYPASS_BNSF_092806 Page 4 0.0000 in/hr NO NO YES NO Conduit Summary: Trib Area Flow Capacity Velocity Normal Depth 36.2600 ac 27.1365 cf 25.0113 cf 5.5282 ft/s -1.0000 ft Ent Loss Exit Loss Frict Loss Start TW 0.237275 ft 0.474550 ft 0.122392 ft 22.9223 ft comment: Hydrograph not shifted, 0.45 min forwarded.Submerged or overtop bank condition. Reach ID: P-815 Section Properties: Shape: Circular Routing Method: Travel Time Translation Size Material Mannings n Hyd params By 30" Diam Conc-Steel Form 0.0110 Mannings Formula Length Slope Entrance Loss 81.0000 ft 0.26 % Square Edge w/Headwall Diam 2.5000 ft Up Node Dn Node Up Invert Dn Invert CB 815 CB 810 19.2086 ft 18.9980 ft Conduit Constraints: Min Vel Max Vel Min Cov Min Slope Max Slope Min drop 2.0000 ft 15.0000 ft 3.0000 ft 0.5000 ft 2.0000 ft 0.0000 ft In/Exfil Hold Up Hold Dn Match Inv Allow Smaller 0.0000 in/hr NO NO YES NO Conduit Summary: ' Trib Area Flow Capacity Velocity Normal Depth 36.2600 ac 27.1365 cf 25.0113 cf 5.5282 fUs -1.0000 ft Ent Loss Exit Loss Frict Loss Start TW 0.237275 ft 0.474550 ft 0.247844 ft 23.6193 ft comment: Hydrograph not shifted, 0.33 min forwarded.Submerged or overtop bank condition. Reach ID: P-820 Section Properties: Shape: Circular Routing Method: Travel Time Translation Size Material Mannings n Hyd params By 24" Diam Conc-Steel Form 0.0110 Mannings Formula Length Slope Entrance Loss 85.0000 ft 5.38 % Square Edge w/Headwall Diam 2.0000 ft Up Node Dn Node Up Invert Dn Invert CB 820 CB 815 24.4470 ft 19.8740 ft Conduit Constraints: Min Vel Max Vel Min Cov Min Slope Max Slope Min drop 2.0000 ft 15.0000 ft 3.0000 ft 0.5000 ft 2.0000 ft 0.0000 ft In/Exfil Hold Up Hold Dn Match Inv Allow Smaller 0.0000 in/hr NO NO YES NO Conduit Summary: Trib Area Flow Capacity Velocity Normal Depth 36.2600 ac 27.1365 cf 62.7500 cf 19.2492 ft/s 0.9194 ft Ent Loss Exit Loss Frict Loss Start TW 0.579285 ft 1.158569 ft 0.854998 ft 24.5790 ft StormShed Report Monday,October 09,2006 Project:OFFSITE_BYPASS BNSF 092806 Page 5 Node Records � Node ID: CB 804 Desc: Manhole structure Start EI: 18.6100 ft Max EI: 23.5400 ft , Contrib Basin: Contrib Hyd: i Hgl Elev: 22.0512 ft Struct Type: CB-TYPE 2-60 Classification Catch Basin Ke Descrip: CONC: Headwall: square edge;.ke=0.5 Catch Depth: 2.0000 ft Bot Area: 19.6340 sf Condition: No particular shape. Status: Proposed Structure Approach Credit: 0.5046 ft ' Node ID: CB 805 Desc: Manhole structure , Start EI: 18.7900 ft Max EI: 23.7100 ft Contrib Basin: Contrib Hyd: WQ2_4UT_100 Hgl Elev: 22.5562 ft Struct Type: CB-TYPE 2-60 Classification Catch Basin � Ke Descrip: CONC: Headwall: square edge;.ke=0.5 Catch Depth: 2.0000 ft Bot Area: 19.6340 sf Condition: No particular shape. Status: Proposed Structure Approach Credit: 0.4761 ft Node ID: CB 808 Desc: Manhole structure Start EI: 18.3500 ft Max EI: 21.1900 ft '�, Contrib Basin: Contrib Hyd: ' Hgl Elev: 21.2900 ft Struct Type: CB-TYPE 2-54 Classification Catch Basin Ke Descrip: CONC: Headwall: square edge;.ke=0.5 Catch Depth: 2.0000 ft Bot Area: 15.9040 sf Condition: No particular shape. Status: Proposed Structure Approach Credit: 0.0003 ft Node ID: CB 809 Desc: Manhole structure Start EI: 18.4000 ft Max EI: 20.7000 ft Contrib Basin: B-809 Contrib Hyd: Hgl Elev: 20.8000 ft Struct Type: CB-TYPE 1 Classification Catch Basin Ke Descrip: CONC: Headwall: square edge;.ke=0.5 Catch Depth: 1.4160 ft Bot Area: 3.9700 sf Condition: No particular shape. Status: Proposed Structure Approach Credit: 0.0000 ft Node ID: CB 810 Desc: Manhole structure Start EI: 18.9980 ft Max EI: 23.8800 ft Contrib Basin: Contrib Hyd: Hgl Elev: 23.6193 ft Struct Type: CB-TYPE 2-54 Classification Catch Basin Ke Descrip: CONC: Headwall: square edge;.ke=0.5 Catch Depth: 2.0000 ft Bot Area: 15.9040 sf StormShed Report Monday,October 09,2006 Project:OFFSITE BYPASS BNSF 092806 Page 6 Condition: No particular shape. Status: Proposed Structure Approach Credit: 0.4746 ft Node ID: CB 815 Desc: Manhole structure Start EI: 19.2100 ft Max EI: 25.4000 ft Contrib Basin: Contrib Hyd: Hgl Elev: 24.5790 ft Struct Type: CB-TYPE 2-60 Classification Catch Basin Ke Descrip: CONC: Headwall: square edge;.ke=0.5 Catch Depth: 2.0000 ft Bot Area: 19.6340 sf Condition: No particular shape. Status: Proposed Structure Approach Credit: 0.0000 ft Node ID: CB 820 Desc: Manhole structure Start EI: 24.9500 ft Max EI: 29.6100 ft Contrib Basin: B-820 Contrib Hyd: Hgl Elev: 28.7028 ft Struct Type: CB-TYPE 2-54 Classification Catch Basin Ke Descrip: CONC: Headwall: square edge;.ke=0.5 ; Catch Depth: 2.0000 ft Bot Area: 15.9040 sf Condition: No particular shape. Status: Proposed Structure Approach Credit: 0.0000 ft � Node ID: CB-807 Desc: Manhole structure Start EI: 18.8940 ft Max EI: 23.7700 ft Contrib Basin: Contrib Hyd: Hgl Elev: 22.9223 ft Struct Type: CB-TYPE 2-54 Classification Catch Basin Ke Descrip: CONC: Headwall: square edge;.ke=0.5 Catch Depth: 2.0000 ft Bot Area: 15.9040 sf Conditi�n: No particular shape. Status: Proposed Structure Approach Credit: 0.4746 ft Bend Loss: 0.0030 ft Junction Loss: 0.0007 ft Node ID: INLET Desc: Manhole structure Start EI: 26.0000 ft Max EI: 108.0000 ft Contrib Basin: Contrib Hyd: B-002 + B-001 100yr Hgl Elev: 30.1393 ft Node ID: OUTLET Desc: Manhole structure Start EI: 18.6000 ft Max EI: 101.0000 ft Contrib Basin: Contrib Hyd: Hgl Elev: 18.6000 ft StormShed Report Monday,October 09,2006 Project:OFFSITE BYPASS BNSF 092806 Page 7 Contributing Drainage Areas Drainage Area: B-809 Hyd Method: SBUH Hyd Loss Method: SCS CN Number Peak Factor: 484.00 SCS Abs: 0.20 Storm Dur: 24.00 hrs Intv: 10.00 min Area CN TC Pervious 0.0300 ac 86.00 0.08 hrs Impervious 0.0300 ac 98.00 0.01 hrs Total 0.0600 ac Supporting Data: Pervious CN Data: None Entered 86.00 0.0300 ac Impervious CN Data: None Entered 98.00 0.0300 ac Pervious TC Data: Flow type: Description: Length: Slope: Coeff: Travel Time Sheet None Entered 50.00 ft 5.00% 0.1500 4.93 min Impervious TC Data: Flow type: Description: Length: Slope: Coeff: Travel Time Sheet None Entered 50.00 ft 5.00% 0.0110 0.61 min Drainage Area: B-820 Hyd Method: SBUH Hyd Loss Method: SCS CN Number Peak Factor: 484.00 SCS Abs: 0.20 Storm Dur: 24.00 hrs Intv: 10.00 min Area CN TC Pervious 0.0000 ac 78.00 0.00 hrs Impenrious 0.8000 ac 98.00 0.04 hrs Total 0.8000 ac Supporting Data: Impervious CN Data: None Entered 98.00 0.8000 ac Impervious TC Data: Flow type: Descripti�n: Length: Slope: Coeff: Travel Time Fixed None Entered 0.00 ft 0.00% 2.1200 2.12 min StormShed Report Monday,October 09,2006 Project:OFFSITE BYPASS_BNSF_092806 Page S Layout Hydrographs Hydrograph ID: OUTLET - 100 yr Area: 36.3200 ac Hyd Int: 10.00 min Base Flow: Pending tt translation: 0.78 min Peak Flow: 27.9819 cfs Peak Time: 7.83 hrs Hyd Vol: 10.1299 acft Time Flow Time Flow Time Flow hr cfs hr cfs hr cfs 0.67 0.0830 9.67 7.8309 18.33 3.6726 0.83 0.3299 9.83 7.4584 18.50 3.6808 1.00 0.6004 10.00 7.4441 18.67 3.6643 1.17 0.9066 10.17 6.9700 18.83 3.6614 1.33 1.1884 10.33 6.6126 19.00 3.6579 1.50 1.3633 10.50 6.6311 19.17 3.5158 1.67 1.5984 10.67 6.3005 19.33 3.3991 1.83 1.7919 10.83 6.0666 19.50 3.4070 2.00 1.9044 11.00 6.0750 19.67 3.3900 2.17 2.1019 11.17 5.9034 19.83 3.3869 2.33 2.2609 11.33 5.7838 20.00 3.3831 2.50 2.3313 11.50 5.7885 20.17 3.3820 2.67 2.4099 11.67 5.6326 20.33 3.3813 , 2.83 2.4722 11.83 5.5177 20.50 3.3814 3.00 2.5283 12.00 5.5254 20.67 3.3817 3.17 2.5799 12.17 5.3713 20.83 3.3823 3.33 2.6356 12.33 5.2564 21.00 3.3830 3.50 2.6965 12.50 5.2644 21.17 3.3838 3.67 2.8688 12.67 5.1097 21.33 3.3845 3.83 3.0138 12.83 4.9942 21.50 3.3854 4.00 3.0595 13.00 5.0014 21.67 3.3863 4.17 3.3591 13.17 4.9861 21.83 3.3871 4.33 3.5927 13.33 4.9845 22.00 3.3879 4.50 3.6231 13.50 4.9830 22.17 3.2472 4.67 3.9412 13.67 4.8438 22.33 3.1313 ' 4.83 4.1831 13.83 4.7305 22.50 3.1394 5.00 4.2171 14.00 4.7411 22.67 3.1227 5.17 4.5443 14.17 4.7267 22.83 3.1193 5.33 4.7945 14.33 4.7257 23.00 3.1154 5.50 4.8303 14.50 4.7240 23.17 3.1142 5.67 5.1650 14.67 4.5844 23.33 3.1133 5.83 5.4216 14.83 4.4704 23.50 3.1132 6.00 5.4587 15.00 4.4803 23.67 3.1132 6.17 6.0539 15.17 4.4653 23.83 3.1136 6.33 6.5150 15.33 4.4638 24.00 3.1141 6.50 6.5283 15.50 4.4615 24.17 1.5557 6.67 7.4220 15.67 4.3212 24.33 0.4793 6.83 8.1057 15.83 4.2064 24.50 0.2886 7.00 8.1098 16.U0 4.2157 24.67 0.1757 7.17 9.1886 16.17 4.2001 24.83 0.1070 7.33 10.0082 16.33 4.1980 25.00 0.0652 7.50 10.0242 16.50 4.1953 25.17 0.0397 7.67 19.9923 16.67 4.1952 25.33 0.0242 7.83 27.9819 16.83 4.1954 25.50 0.0147 8.00 27.4551 17.00 4.1966 25.67 0.0090 8.17 20.6303 17.17 4.0567 25.83 0.0055 8.33 14.4597 17.33 3.9424 26.00 0.0033 8.50 15.5304 17.50 3.9515 26.17 0.0020 8.67 12.7872 17.67 3.9358 26.33 0.0012 8.83 11.1440 17.83 3.9335 26.50 0.0007 9.00 11.1805 18.00 3.9305 26.67 0.0004 9.17 9.5641 18.17 3.7888 26.83 0.0003 9.33 8.3787 18.33 3.6726 27.00 0.0002 9.50 8.4294 18.50 3.6808 27.17 0.0001