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HomeMy WebLinkAboutDrainage Reports - 11/23/20160 NORTHERN CRY OfI ENGINEERING Approved October 31, 2016 D* �1 City of Fort Collins Stormwater Utility 700 Wood Street Fort Collins, Colorado 80521 Collins Approved RE: Amendment to Final Drainage and Erosion Control Report for Walnut -Chestnut Subdivision Second filing Dear Staff: This amendment has been provided to reflect a minor change in floodplain modeling that accompanied the approved Final Drainage and Erosion Control Report for Walnut -Chestnut Subdivision Second Filing, dated April 15, 2016. Attached is a revised Appendix EA which is intended to supersede that provided in the approved final report. If you should have any questions as you review this, please feel free to contact us at your earliest convenience. Sincerely, NORTHERN ENGINEERING SERVICES, INC. Aaron Cyar, PhD, PE Senior Project Engineer L/ 301 N. Howes Street, Suite 100, Fort Collins, CO 80521 1 970.221,4158 1 www.northernengineering.com APPENDIX E.1 BASE FLOOD ELEVATION ANALYSIS NORTHERN ENGINEERING ' October 31, 2016 City of Fort Collins ' Stormwater Utility Attn: Mr. Shane Boyle, PE ' 700 Wood Street Fort Collins, Colorado 80521 RE: 100-Year Flood Elevation Determination for Fort Collins Hotel 1 Mr. Boyle 1 1 1 1 Northern Engineering is pleased to submit this 100-Year Flood Elevation Determination for the proposed Fort Collins Hotel for your review. The project is located just north of the intersection of Walnut and Chestnut and Walnut Street. Jefferson St. Project Site Y_ :+A _�. Firehouse Alley Chestnutst Walnut St. F� r y XI wi-A � V it �f ' A Flow Split Mitchell _! ` ";" "," �• �' a O.n.�*,���w^ t Block VICINITY MAP North* 1 301 N. Howes Street, Suite 100, Fort Collins, CO 80521 1 970.221.4158 1 www.northernengi'neeri'ng.com ' The City of Fort Collins has identified Walnut Street and Chestnut Street as potential flooding areas, and has requested we perform floodplain modeling to further define flood potential within these adjacent roadways by determining 100-year flood elevations. ' The project site is located just north of a previous project site, the "Mitchell Block", for which we conducted similar hydraulic modeling. This modeling was summarized in our previous report entitled "Final Drainage Report for Mitchell Block", dated February 25, 2009. However, ' for the purposes of the Mitchell Block project, the previous modeling separated out flows in the adjacent south half -street of Walnut Street, and determined a 100-year peak flow rate of 36.3 cis. ' In 2009, we obtained effective HEC-RAS files from the City of Fort Collins in order to set up base hydraulic modeling. We added several cross -sections to the effective HEC-RAS model in the ' streets adjacent to the Mitchell Block project (Mountain Avenue and Walnut Street). Please see the effective model workmap in Appendix 2.1. ' For current modeling efforts, the base modeling obtained from the City of Fort Collins in 2009 for the Mitchell Block was utilized as our starting point for modeling Walnut Street and ' Chestnut Street. However, in order to model the flow split at Walnut and Chestnut, we needed to create a separate truncated model because HEC-RAS does not allow a flow split junction to have multiple reaches entering and exiting the junction. The truncated model we created is ' named "Walnut —NE" and is provided in Attachment 3.2. Additionally, in order to model Jefferson Street and Firehouse Alley, we created two separate models. The Jefferson Street model "Jeff —NE" is provided in Appendix 3.3; the Firehouse Alley model "Alley_NE", is provided in ' Appendix 3.4. The Walnut Street model focuses on the flow split that occurs at the Walnut Street, Chestnut Street, and Mountain Avenue confluence. We used the effective model peak 100-year flow in Walnut of 60.0 cfs, and we also utilized the effective model water surface elevation in ' Mountain Avenue near section 11+00 of 4976.18 as a starting water surface elevation in Mountain Ave. This water surface elevation is conservative, as it is based on 100% of the flow from Walnut St. entering Mountain Ave., resulting in slightly higher water surface elevations within our area of interest. The starting water surface elevation was converted from NGVD-29 to NAVD-88 utilizing a conversion factor of 3.18-ft, based on City of Fort Collins Bechmark No. 5-00. Several cross -sections were added within Walnut Street, Chestnut Street, and Mountain Avenue in order to define the flow split that occurs at the intersection. We utilized the same ' parameters found in the effective HEC-RAS model, with n-values in both channel and overbank of 0.016. A hydraulic modeling workmap for the current hydraulic modeling is provided in Appendix 3.1. Table 1, below provides a summary of our modeling results. E I r 1 1 TABLE 1- HEC-RAS MODELING RESULTS Revised 100-Yr 100-Yr Section Street Discharge WSEL ID (CFS) (Ft- NAVD88) Walnut St. 10 60 4977.09 Walnut St. 15 60 4977.47 Walnut St. 20 60 4978.80 Chestnut St. 5 22.08 4973.71 Chestnut St. 10 22.08 4974.08 Chestnut St. 20 22.08 4975.30 Chestnut St. 30 19.58 4976.69 Mountain Ave. 10 40.42 4976.18 Mountain Ave. 20 40.42 4976.71 Jefferson St. 10 24.1 4972.84 Jefferson St. 20 24.1 4973.71 Jefferson St. 30 24.1 4974.74 Jefferson St. 40 24.1 4975.91 Firehouse Alley 10 9.5 4975.26 Firehouse Alley 20 9.5 4975.68 Firehouse Alley 30 9.5 4978.19 Previous 100-yr WSEL (Ft- NAVD88) 4977.13 N/A 4978.81 4973.71 4974.08 4975.30 4976.18 4976.71 4972.84 4973.71 4974.74 4975.91 4975.26 4975.68 4978.19 It is noted that a slight modification in site plan was conducted, and the "Revised" 100-Yr WSEL column in Table 1 reflects this modification. Previously reviewed and approved 100-Yr WSEUs ' are provided for comparison. In order to determine peak 100-year flow rates in Jefferson Street and Firehouse Alley, as well as to determine the local basin flow contribution to Chestnut Street, we obtained the current effective SWMM model associated with the Downtown River District Final Design Report, by Ayres 2012 (Appendix 1.1). We modified this model by breaking Basin 106 into three sub -basins, "Basin ' 106a", 'Basin 106b", and `Basin 106c", and we named this model "DTRD-NEmod-100yr". A modified basin map, along with all SWMM output is provided in Appendix 1.2. 1 Hydraulic modeling for Jefferson Street and Firehouse Alley has been done in two separate models. Model "Jeff -NE" is provided in Appendix 3.2; Model "Alley_NE" is provided in Appendix 3.3. We ' utilized the same parameters found in the effective HEC-RAS model for Walnut Street, with n- values in both channel and overbank of 0.016. A hydraulic modeling workmap for the current model "Oak_NEmod", is provided in Appendix 2.1. Table 1, below provides a summary of our modeling results. 3 1 ' Please find attached the following model output and exhibits: ' Attachment 1.1— Current Effective SWMM Output Attachment 2.2 — Modified SWMM Exhibit and Output Attachment 2.1— Effective HEC-RAS Modeling Workmap - Walnut Street Attachment 3.1— Proposed Condition HEC-RAS Modeling Workmap Attachment 3.2 — Proposed Condition HEC-RAS Modeling Output — Walnut and Chestnut Street ' Attachment 3.3 — Proposed Condition HEC-RAS Modeling Output — Jefferson Street Attachment 3.4 — Proposed Condition HEC-RAS Modeling Output — Firehouse Alley ' If you should have any questions as you review this, please feel free to contact us at your earliest convenience. ' Sincerely, NORTHERN ENGINEERING SERVICES, INC. tAaron Cvar, PE Project Engineer 11 �J 1 4 I I 1 �I I E I ATTACHMENT 1.1 Current Effective SWMM Output I [1 1 1 I u o f G N I C - I a v > o f * O) # I u u l E O m I U 11 I 1C) 1 « 4 -.E1 Q) Id 4 Q) I * 11 C E* 0 0 '0 •b 11 a 1 E Z I * O -'I k- -- O O ro T l Z O I Y C+111 K Orl Z Z O E I H M I Y •.1 V Y O N I O O I I k ro E u K N N 0 0 0 U R i • d 1 O O* I I 0 0 0 U) 01 G) 1 I # a U a* Z n r •• •• •• m m m I rl l # m N* O fJ:H HNO ro ro 1 1 o00o E I W U) Q1 I I * 'O u # V1 V1 a Z f1' o •• •• •• o Z N u O I * N.0 K W W 00 W W oOH W W u U .-acn�oo u I £ I # m p U* U N Z Z N N z Z w 0 o 0 0 o H C C a l u '❑ I Y U G) ro k •.I -.i O l ro ii I Y -.i o Y a a 41 I o W I # 11 .0 u K U) N JJ ro 1 O I I I * 4,0 # K m O m K * W a1 * • '0 'O m 0 0 T E 7 mw m 01 6: • 11 N d• C 01 1 1 1 * T« # u x # ro x 1 * T r1* w - v .a .c .ro .a E E roo - •rom I # Ex I « 4 m a# # m* W N 41 41 ❑ 0. -'1 -H b L) w a # T« I K E K a l k 0 v m« K G K •• O x T Ol W a) a1 x x 0 m m a * u* I # a W I * '-I a)K * O* bl C - b+011 F. $. 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O N O O O O O O O O O O O Vl 1� C I .i .i .-1 •-1 '-1 •-1 'i •-I 'i •-I •-I •i •-I N N r1 rl .-1 .-� •--I 'i •-I •-1 •i •-I •i •-I •-I •i •-I •-1 •i •-I 'i rl •-I •-I •-I '-I 'i •-1 •-I '-I •-1 '-I •-I •i •-I •i •-I •-I v � a a I I I I I I I I I 1 I U M wa,waaawaamawawUawUacoaaU 7 I FFEaaaaaP] W CI Oq C1 CI GI W C1 W 00 P9 P]Rl W 'O I I I I I 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 H H E E F F E E E F F F F F E E F'E E F I [1 0000000000.�0000000 . o00000000000000000 000000000000000000 000000000000000000 000000000000000000 ' <'1N�C1ON01NrIO nlr W 01NPPO 000.-� O 00.-10.-100.-I O 00 00 ' ommmrnommrnmornmrnmWmo ......mmrnmornrnrnmrnm. 000000000000000000 000000000000000000 000000000000000000 ' 00000 O o O Oo o O O O O000 In0000m000000000000 .-I0000.�0OOOOOOOOOOO 0 o b o 0 0 0 0 0 0 0 0 0 0 0 0 0 0 ' P000 o�n .-I .� o 00 00 000 orn m ... 0 0 W 0 0 0 0 0 0 0 0 0 0 ....... 0000 0000 00.-IOO 00000 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 .......... 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 O 000 O �--100 O 00 00 0000.-1 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 o m . . . . 0 . . . . . 0 . 0 0 . . 0 . 0 . 0. 0 0 0 0 0 .-� '-1 .-1 .-i ri O r-I •-1 •-I •-1 O r-I '-I '-1 .i N ti O 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 . . . . C. . . . . . . . . . . . 0 0 0 0 0. 0 0 0 0 0 0 0 0 0 0 0 0 0 O O 000 000 O N 000\ 0000 �D O O O O O O O O O N O 0 0 0 0 0 0 10 '-I '-I n-1 •-I •-I •-I .-I •-1 .i •-I .i '-I .-1 'i �-1 .-1 •-I •-I k ?i k k u k k ro « # k # W # # b# # u # k ro k ' # U # # u # # a # k m # RC�moo.�-1-I rCm FC m rC rt m.Cma � alp m 01 O� .-1 •-I •-1 '-I •-1 N N t+l N N 1'1 N F rl # -.I k mmmmmmuuuuu❑❑❑❑vla❑ k ak 1 1 1 1 I I I I I I I I 1 1 I IH I # b k F F E F F E H H E H F H F F E F O E # C k �b I Ri N W I r1 P �-1 .-1 N O W In O� 01 .-1 ID .-1 P N W l+) U) .i .-I P .-1 .--I t1 .i N .-I N .--I •i .-1 .......... . 7 U -rl I . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ro a I U I I 3 .-1 o I a W I u rl I !. . . ..-1 r1 . . . . . . .O. O1 .00.--. OOO OO O> E i o00000000000o.�.-I .�.i00000000000000 x AAo u I FC Z I I I I I O rl rY O O r-1 r'4 r1 rl fl O O O 01 rl 01 O� ri rl ri O O O O rl O O N rl rl O I W I I u l OO OOOOOOOOOOO N N.-I .-1 OOOO OO OO O O OO OO I 11 I N I W I I C I I ❑ I I aI W I . . . . . I . I . r. . . . . 1 O. O. I 1 . . . . . I . . . . 1 O W N 41 I N u m I 0 5 x I tl! I .i P ONN 0OO0001 r N OIN I'1 f'I IONN Pf'I r In ON. -I r mmOl I C I . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . I C I N 4J I O I I m I V v C 0 U U m m mrC mtC rlmURC FFaaammmm r-INI'INI'I P 10 �ormm�.�-I-I .iN rlP Ul to rl`'1P K I F E P F F F F �C�C�Cmmmmmmmmmmuuuvuuu❑❑ww�aa���� 1 O O O O O O O O 0 0 0 0 0 0 0 0 O O O O O O O O 0 0 0 0 0 0 0 0 OOrl rl�N'-I rl ' o0000000 R] U ti rr W RC W W Cq (ODUU�� ' HE+HH EE E+EF �111141 � h 3 i 1 1 11 1 I 1 F, 1 1 t L ATTACHMENT 1.2 Modified SWMM Exhibit and Output 1 p •caassaaeass�a:nassar=,�-�a�sasaacaaa�=�e'a "--dr=adds-d4• dd-dddde d -dd added- - - Y+ ass^a s^asaa�asascgaw;sa:ss=aq-gsa��a:ac= $ asaga==aR:sessaq�ggeSsasa.qeaa�alq =xr..c.a.,.,. c !!!!lAAFlA'e='."•-'oaaa.angHAaAa3AAfiAXEFGA ro 4J ,J 0 N b> 1 -[1 Oo l # 0 x E V O 4 I N I # ro 0 * N U 4J I N a= I #N * * W # J-I c PG H I * 4 W k x * O0. 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H H m' a m H m a m U H a U U H H m H 171 F I H H I I I I m W W W l l l I W I m I 1 l E I l I U I I W W I W u I I I I I I I W m l l l l W W HHHH I42 a2 F OHH IHHaaHa FF as W W W W S Z Z Z W W W C42;wmFFF N m P IO W Z W m W W W V W WSW W Z Z W Z W W ZPW W W W Z H W W W W O Z Z zzzza a a a x a s ,Jy a a H H a H m a a H m a a a a O H H H ... W W W W H H H N O O O O H W H£ 7.I 0 zzmxx Z W W H W N M H W W H z H H Q W W 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 O P m O m 10 1p .-1 N Ol tp �O Ol N m r Ol P O N m O m P P r-1 P O H Ol m N Ol m r N P ill N r r .-I m lD IO m m O m P �O m r m N N O m r 0 Ill r M Ol P N N N 0 H Ol N Itl H IO Ol P m o m N P ID �p P �() r r m m 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 O O O O O O O O O O O O O O 0 0 0 0 0 0 0 0 0 0 0 0. 0 0. 0 0 0 0 0 0 0 0. 0 0 0 0 0 0 N It7 I(1 N Yl �() N N N O O O O N In N� N N O N N N N to ill �() Ill IA N UI N N N Ill O Ill II) O to N N ill Ill �() rn m rn m rn m rn rn m Iu m H m rn m rn m m rn m m rn m rn rn rn m rn rn m m w m m m m m rn m m m m rn m m 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 1 N r m N O r.- I P P m O l P r I N N r N O l m O m I O r r m m P m I D N r I O r m. -1 Nmr P P m ONO 1 O H m P Ill 01 H rl N N lO N .-I H N Ill P N P N m r P H 1(7 m m .-I m P N N P P N •-1 rl H m P N Ol m m H rl O O O O O O N O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O m Ill 'Nm01 m IllNmm Ol mOOlmm IIImN NmID Pm Iom r IOOmmmN P m P.iN Ol r TN bNN O m H N N O P r l H ONO N O r l H m N O H H m no, O O O C; 0' N 0 0 0 O 0 0 0 0 rI J 'O .� N m P V l IO r m Ol O H N m P l!7 m r m Ol O .-1 N m P N 10 r m 0 •-1 N m P 1() b r m 0 H N m 0� l0 0000000000'-I rl rl rl �-1.-1.-I.-I.-1.--IN NNNNNNNNOOOOOOOOOrI '-I rl r1000 1 1 •d N l o 0 0 0 0 0 0 0 0 b u i000000000 O a LL I I I I I b a t Ol r P m P N P O N �' 0 1 IO mmlON N Nm P O 1 I I 1 I I 11 I P H m IO m P Ill m N H > I OI r IDrNON . V' >.i I SON Om H N tiH.-I q W I ulr towrrr rr H I Ol 01 01 01 Ol 01 Ol 01 01 I P P P P P P P P P izzzzzzzzz 1000000000 I H H H H H H H H H I F F F H F F F F F N I U U U U U U U U U F I h 7 h� h h h h h I N 1 > > 1 la C4 * H# I rJOaUmUmam mmPP m Cl ## m 1 Hm m m m mm m m # # I G I I I I I I I I # m# I E W W W W W W W W * w* w 1 uzzzzzzzz # 'O # I Q H H H H H H H H # of I axxxxxxxx # Z# z 1 U W W W W W W W W in y i M i L i i i II i i i i 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 00 0 0 0 0 0 0 .............................................................. 00000000000000000000000000000000000000000000000000000000000000 !`l InONPO W III OIN W OlD W Ul OONON m P PO r W l�l l�l r Pin ill W �111001 .i, 01 ON l'1N r in N4lN ul �O O�Ot�1N.-11`l O.-I.-I000O 'r l•- I O O O l P P l D O l O O m m N P N I n l 0 O. -1 01 .- � 01 O W W H O l� l� O l 0 r l O O 1� 1 r N l O N W N m W l 0 l� l b N O�� m r O N l `l N r 1 0 0 0 0 fi Ol t'1 n'lr l`I�NNPPI"1 t`1 W rNC'1 t'1N ulN Pr PP.-IP lnrnmrnrmmmmr01010rmOlOOinOOrlOPrr01 W W rul .-1000 101000r1P.-10001N Oln lD In l001�NPOlOPP W O W mrPOIH HHrONNIOmNNNP W OI IG Nc'1m N001r P W ill r10000 rIN PNOOOIOPrOlOm01PO(�1P min ulr NrrON00(�l�N HPP O1�1 lOmmPPill (�lNrr'-IN O.-IOmPNOI \0010000 VI 1llr ul Nl0 tp 10 rlo �O �D 10 �D l0rr r�Il N�0101p 1p lD �O IDPNUl 1Il l0 l0 l0 1p r�Il in lO �n 1p 1p lD �O lO ID lD lOPPPP�Il ifl ill N�Owr rn m rn m m rn rn rn m m m m rn m m rn rn rn m rn rn m rn m m m m m m m m m m rn m rn m rn m rn m rn rn m m m m m rn m m rn rn m rn m m m m P P P P P P P P P P P P P P P P P P P P P P P P P P P P P P P P P P P P P P P P P P P P P P P P P P P P P P P P P P P i izzzzzZzzZZZZZZZZZZZZZZZZZZZZZZZzZzzzzzzzzzZZZZZZzzzzzzzzzzzzzZ 00000000000000000000000000000000000000000000000000000000000000 H H H H H H H H H H H H H H H H H H H H H H H H H H H H H H H H H H H H H H H H H H H H FI H H H H H H H H H H H H H H H H E F F F PH PH F F F F F F F F F F F F F F F P F F F PH F F PH PH E F F F F E F F F F F F F F F PH E E PH F PH E+ F E+ U ti Uh Uph Uh Uh Vh Uh Uh Uh Vh Uph Uh Vpph Uph Vph Uh Vh Uh Uh Uh Uh Upph Upph ph Uph Upph Vph Uh Vh Uh Uph Uph UU� UUy Uh Uh Uh U7 Uh U�i V� V U UUh Uph Uh Uph Uh U U� U U U V U V U U U znznzzzzzzzz z z6nzzgzyEzyZZZZZZnZEEpzzzzzyzyznzzzzzz y h h h h h h h m -1 Nell c�1P.-1.-i .-1 NN�'1 P Nr Ol .-1 r1 NN.-INN 1'1M r1 E �.+ l aaaQQmmmmmmmmmmclUclucaraooca m x h I D F E F E E E E F F F E E E E E E E E E EE F E F�Nr1Pul.-1.-1.-1 .iN �'l �1PP Pin �nr rmrn.�N c'1P N�DrNr1Pm S H W W W W W W W W W W W W W W W W W W W W W W W W Q'Q Q Q Q m m m m m m m m m m m m m m m m U U U U U U U 0 0 IN to P C £ m a a a a a a a a a a a a a a a a a a a a a a a a I I I I I I I I I I I I I I I I I I Ix I I -I I�G Ix Ix I Ix I I I IyF .� .+.� X X x Z Z Z Z Z Z Z Z Z Z Z Z Z Z Z Z Z Z Z Z Z Z Z Z x E x a� T. aC ££ x j £££££££ E�££�££ 000 3 W W W M H H H H H H H H H H H H H H H H H H H H H H H ££ S£ £ H v I 1 tll 1 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 wIMMMMMMmmmmmmmmmmmmmmoMmMMmmmmmmmmmmmmmmmmMMMMMMMMM G1 I .i .� .-I .-1 .� .-1 .Y H .-I •-I ti N .i N .-I rl •-I rl r1 .1 .i .--I .-I .� .-1 H •-1 H e-1 H •-1 ti H N •-I .i •-I •-I rl 'i rl .� .-1 .� .� H H .-I .-I H ' .................................................. b�1 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 1 O I al I G) I H.-I IIIO NIDNmP01NOI O I(1 W Off'-ImNOP.--I HOOOMm�ONPPO�ID W tDmPONP W.II)01MPrNmr a 1 W POIn PIDO W rl W e-1NrO�rr �-1 lO W 1p 1llH H01Hrr.-1H.-1 �O W OOP0110NOOPr�Dr P0.-iOPO ' O l rrOIO MOB. -I IDNP W mP�Or W OlO W H.-IH HOI W N W OI rIP NIOOHmtt>tnmOOPr01 InOObOOO O. rl. u. . . . .mmNmNmrr fA I . . . . . . . . . .O. . . . . . . . ..-. . . . .IO . 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N.... ...... -I . .. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 o. o W rn W o 0 o r o 0 o W o 0 0 0 0 0 0 0 0 0 0 0 0 o a W W m o 0 0 0 o m o m o 0 0 o m o 0 0 0 0 0 0 0 0 0 0 0 00000.l.-I�oo.l.lo.l.-l000000000000000000000000000000000.a0000000 O oo o o o00000000000000000000000000000000000000000000000000 1 00000000000000000000000000000000000000000000000000000000 000000 0 00000 0 000000000000 oo.a mo.-Io 00 0 00 00 0 00 o.-Io 000000000 o ti 000000000000000000000000o.r000000000000000000000000m l00000000000000000000000000000000000000000000000000000000 . . . . . . . . . . . . . . . . . . . . . . . . ...... . . . . . . . . . . . . . . . . . . . . . . . . . . .-1 rl rl rl rl O O O O O O O O O O O rl rl •i el rl rl rl rl rl rl rl O O O •-I rl O rl '-I rl rl '-I rl rl rl rl rl O .-1 .-I .-1 .-1 O .-1 .-1 .-I .-1 N ti O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0000 000000 000000000000001(1 O N 00000000000000000000 �(10000 00 OI() rl rl rl .i rl rl .-I rl H N .a .-� .-� .-� .M .-� �-1 .-� .-1 .-1 .� .� .� ri rl rl rl rl rl rl rl rl •-1 rl •-I rl •-I .� rl rl .-� .-� N N '-I rl .-I .-I .-1 .-I rl .i r1 ti .-� .� x T # # YI # k ro# x x # a# # N # x N x x b x # it k # ro# x G x x U* « u x ' R a R m mca mQQcQ mrC m Urt m UQ m FC tC U FC 4 mo o� FC ra 4 VQ Oro 4 mw k y# I I I .i Nf�11+1P N PPP PQM r rm rl0 NUN M MN UN 00 Q 0 0 M CO0 fQ M M M M F E F rt RC •C fC RC m m m CO m m m m m m m m m m m m m m m m m U U U U U CI x a x I I I IH I x Gs O.-I Nf�I E H E C-" El' EEFE F E EE E E E EL F F FH HE E+HHE EE EE HHHEHHHH0E m NPo r ,Y mmmmmuUuUU0U00aw0W���� U# h y I I I I I I I I I 1 I 1 I I I 1 I I I I I I 1 I I I I I I I I I I I I I I I I I I I I 1 1 I 1 a o w 0 w m S O w C r-1 P i-1 �-1 N O m Ilf OI 01 .-1 lO .-1 P N m M N .-I .-1 P .ti ti M .-I N rl N rl •-I rl rl rl O l0 M Ol .-I .-I . . . . r-I O 0000000 O m O� rl O N O 000000000000.--I O.-I N.-I O . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 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'. . . . r. .. r. . •-I r. 1 C I . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . I W I O O O O O O O O O I I N I F I 1 N I I O I 1 � I I I I I ` ui mwQwQQmuQwu�QmQw .i I 1 I NMPMMMPPP.-1.-1.-iM N.-1 7 I HHQQQCI W fA fO IO CI OqU V Uq q C I o .a F E F E F E F E F E F H E H H L) i 4404mwmwmfnmmmoPacQici0ucu'icu000wwwww��w��������� 3 y ATTACHMENT 2.1 Effective HEC-RAS Modeling Workmap - Walnut Street I 1 1 I 1 ��'�C 6 svb� •�,Tr! �i •� ( eq. �( `IT 'Y'� +i� tY . y 5� Y r � m% `M _ ���� a ATTACHMENT 3.1 Proposed Condition HEC--RAS Modeling Workmap I 1 C I IN PUT) �wR ® NORTH LEGEND: uPRD AU uwrs OF " No m r-GE-vur/PNCPeTry Uw M"W ELWB s CLEVER FASTING CaO2TE PRGPOSFG @IaErE P.AwAwl O PNOPGSFG PA CT) FROPOMEANDPE AVM (E: PNGRowD W LFRIILK COB t GEMR SE"ON RTANNG WAL E= NG TREES EM NG MAJDR CWTWR A50 EWEVNG MNOR CONTWR PRWfhEG CMiWRS �79 NOTES: 1. RE TO THE' NAL MANAGE RPOT FOR WALNUT CHESTNUT W MMSIO RPLAY By NORTHUN E NEERIN , DAM APWL VP 2016 FOR FLORQIAL IWORWATKH. Z. ALL ELEVATIONS A RETARD TO THE NATO-W TERUAL OATUM. FIELD SURVEY BY: G4l LILVY1piWIGiKN f81TFROF GRAo Can E6M6rW mo. 424o Architecture Inc. MRpR6MPIGE WI SETREFTMLLC GIFNER MENMWANAVE FgRCGPUSArGAUG t 9]OAER2 HOTU A611 FGIMC, LLC OEVFLC191 U25 ROCKY WLNTMN AVE STE AD GO MS [DYEWID. 970961.99E IMN2R WO RECCNRNC UT111 ER000A151M}E 6DP DENDEN CO6 WCO fT CNL ERN WC MUCLUSEAWEIWO ap3 CIXIEEf AYF FORT COLEND, 0D MA L 970 M95115 f%OAi]11] LNMLAR 1415MIFMA6rLOgR 1A15LOlEI£/.`h MW [910AN� f%DSlIA1S tgM" f MI V Z J_ D �9t ZO�� HZZco w0° W = W v vS t °6 z -j HZCo0 Z�z� Q�Qo m Cn PARANG GPPAGE 15 APR 7016 WEAN SUBMITTAL I66.r DE6CRITpM DAIS MCMIKT6PRPIECINRIBI 2112900 1 ATTACHMENT 3.2 Proposed Condition HEC-RAS Modeling Output — Walnut and Chestnut Street 3 ' FORT COLLINS HOTEL WALNUT STREET AND CHESTNUT STREET HYDRAULICS; PROPOSED CONDITION MODEL ' NORTHERN ENGINEERING; October 31, 2016 Page 1 of 11 REC-RAS HEC-RAS 5.0.1 April 2016 ' U.S. Army Corps of Engineers ' Hydrologic Engineering Center 609 Second Street Davis, California X X XXXXXX XXXX XXXX XX XXXX ' X X X X X X X X X X X X X X X X X X X XXXXXXX XXXX X XXX XXXX XXXXXX XXXX ' X X X X X X X X X X X X X X X X X X X X X XXXXXX XXXX X X X X XXXXX 1 PROJECT DATA Project Title:'Walnut Street - 100yr-Proposed Project File : Walnut_NE.prj Run Date and Time: 10/26/2016 1:36:18 PM Project in English units PLAN DATA Plan Title: Plan01 Chestnut Split Plan File : d:\Projects\997-002\Drainage\Modeling\HEC-RAS\HEC-RAS-Proposed Cond-2016-08- 09\Walnut_NE.p01 Geometry Title: Chestnut Split Flow Geometry File : d:\Projects\997-002\Drainage\Modeling\HEC-RAS\HEC-RAS-Proposed Cond- 2016-08-09\Walnut NE.g01 Flow Title : Flow 01 Flow File : d:\Projects\997-002\Drainage\Modeling\HEC-RAS\HEC-RAS-Proposed Cond- 2016-08-09\Walnut_NE.f01 Plan Summary Information: Number of: Cross Sections = 9 Multiple Openings = 0 Culverts = 0 Inline Structures = 0 Bridges = 0 Lateral Structures = 0 Computational Information Water surface calculation tolerance = 0.01 ' Critical depth calculation tolerance = 0.01 Maximum number of iterations = 20 Maximum difference tolerance = 0.3 Flow tolerance factor = 0.001 Computation Options Critical depth computed only where necessary Conveyance Calculation Method: At breaks in n values only Friction Slope Method: Average Conveyance' ' Computational Flow Regime: Subcritical Flow FLOW DATA Flow Title: Flow 01 FORT COLONS HOTEL WALNUT STREET AND CHESTNUT STREET HYDRAULICS; PROPOSED CONDITION MODEL NORTHERN ENGINEERING; October 31, 2016 Page 2 of 11 Flow File : d:\Projects\947-002\Drainage\Modeling\HEC-RAS\HEC-RAS-Proposed Cond-2016-08- 04\Walnut NE.f01 Flow Data (cfs) River Reach RS PF 1 Chestnut Split 1 30 .10 Chestnut Split 1 - 20 12.5 Mountain Split 1 - 20 50 Walnut 1 20 60 Boundary Conditions River Reach Profile Upstream Downstream Chestnut Split 1 PF 1 Known WS = 4973.71 Mountain Split 1 PF 1 - Known WS = 4976.18 GEOMETRY DATA Geometry Title: Chestnut Split Flow Geometry File : d:\Projects\947-002\Drainage\Modeling\HEC-RAS\HEC-RAS-Proposed Cond-2016-08- 04\Walnut_NE.g01 Reach Connection Table River Reach Upstream Boundary Downstream Boundary Chestnut Split 1 Split-1 Mountain Split 1 Split-1 Walnut 1 Split-1 JUNCTION INFORMATION Name: Split 1 Description: Energy computation Method Length across Junction River Reach Walnut 1 Walnut 1 CROSS SECTION RIVER: Chestnut Split Tributary River to Chestnut Split 1 to Mountain Split 1 REACH: 1 RS: 30 INPUT Description: Station Elevation Data num= 6 Sta Elev Sta Elev Sta Elev 0 4977.14 23 4976.68 23.05 4976.18 46 4977.2 Manning's n Values num= • 3 Sta n Val Sta n Val Sta n Val 0 .016 0 .016 46 .016 Reach Length Angle 154 70.4 Sta Elev Sta Elev 41 4976.54 41.05 4977.04 FORT COLONS HOTEL WALNUT STREET AND CHESTNUT STREET HYDRAULICS; PROPOSED CONDITION MODEL ' NORTHERN ENGINEERING; October 31, 2016 Page 3 of 11 Bank Sta: Left Right Lengths: Left Channel Right Coeff Contr. Expan. 0 46 224.9 224.9 224.9 .1 .3 ' CROSS SECTION OUTPUT Profile @PF 1 E.G. Elev (ft) 4976.68 Element Left OB Channel Right OB Vel Head (ft) 0.10 Wt. n-Val. 0.016 W.S. Elev (ft) 4976.58 Reach Len. (ft) 224.90 224.90 224.90 ' Crit W.S. (ft) 4976.57 Flow Area (sq ft) 3.91 E.G. Slope (ft/ft) 0.005963 Area (sq ft) 3.91 Q Total (cfs) 10.00 Flow (cfs) 10.00 ' Top Width (ft) Vel Total IWO 17,99 2.56 Top Width (ft) Avg. Vel. (ft/s) - 17.99 2.56 Max Chl Dpth (ft) 0.40 Hydr. Depth (ft) 0.22 Conv. Total (cfs) 129.5 Conv. (cfs) 129.5 Length Wtd. (ft) 224.90 Wetted Per. (ft) 18.39 Min Ch El (ft) 4976.18 Shear (lb/sq ft) 0.08 ' Alpha 1.00 Stream Power (lb/ft s) 0.20 Frctn Loss (ft) 1.40 Cum Volume (acre-ft) 0.08 0.00 C & E Loss (ft) 0.00 Cum SA (acres) 0.27 0.00 ' Warning: The energy loss was greater than.1.0 ft (0.3 m). between the current and previous cross section. This may indicate the need for additional cross sections. ' CROSS SECTION ' RIVER: Chestnut Split REACH: 1 RS: 20 INPUT Description: Station Elevation Data num= 7 ' Sta Elev Sta Elev Sta Elev Sta Elev Sta Elev 0 4975.45 10 4975.25 10.05 4974.75 27 4975.4 44 4974.75 44.05 4975.25 54 4975.45 ' Manning's n Values num= 3 Sta n Val - Sta n Val Sta n Val 0 .016 0 .016 54 .016 Bank Sta: Left Right Lengths: Left Channel Right Coeff Contr. Expan. 0 54 113.1 113.1 113.1 .1 .3 CROSS SECTION OUTPUT Profile $PF 1 ' E.G. Elev (ft) 4975.28 Element Left OB Channel Right OB Vel Head (ft) 0.11 Wt. n-Val. 0.016 W.S. Elev (ft) 4975.18 Reach Len. (ft) 113.10 113.10 113.10 Crit W.S.` (ft) 4975.18 Flow Area (sq ft) 4.80 E.G. Slope (ft/ft) .0.006447 Area (sq ft) 4.80 ' Q Total (cfs) 12.50 Flow (cfs) 12.50 Top Width (ft) 22.43 Top Width (ft) 22.43 Vel Total (ft/s) 2.61 Avg. Vel. (ft/s) 2.61 Max Chl Dpth (ft) Conv. Total (cfs) 0.43 155.7 Hydr. Depth (ft) Conv. (cfs) 0.21 155.7 Length Wtd. (ft) 113.10 Wetted Per. (ft) 23.22 Min Ch E1 (ft) 4974.75 Shear (lb/sq ft) 0.08 Alpha 1.00 Stream Power (lb/ft s) 0.22 Frctn Loss (ft) 0.74 Cum Volume (acre-ft) 0.05 0.00 ' C & E Loss (ft) 0.00 Cum SA (acres) 0.17 0.00 I H FORT COLLINS HOTEL WALNUT STREET AND CHESTNUT STREET HYDRAULICS; PROPOSED CONDITION MODEL NORTHERN ENGINEERING; October 31, 2016 Page 4 of 11 Warning: The energy equation could not be balanced within the specified number of iterations. The program used critical depth for the water surface and continued on with the calculations. Warning: Divided flow computed for this cross-section. Warning: The energy loss was greater than 1.0 ft (0.3 m). between the current and previous cross section. This may indicate the need for additional cross sections. Warning: During the standard step iterations, when the assumed water surface was set equal to critical depth, the calculated water surface came back below critical depth. This indicates that there is not a valid subcritical answer. The program defaulted to critical depth. ' CROSS SECTION 1 H 1 0 I RIVER: Chestnut Split REACH: 1 RS: 10 INPUT Description: Station Elevation Data num= 36 Sta Elev Sta Elev Sta Elev Sta Elev Sta Elev 0 4981 .1 4974.78 3.76 4974.66 6.16 4974.7 6.45 4974.71 7.98 4974.52 10.34 4974.24 10.6 4974.09 10.87 4973.88 12.36 4973.95 23.84 4974.25 24.64 4974.27 25.25 4974.27 48.43 4974.49 48.98 4974.49 61.12 4974.31 67.12 4974.22 84.73 4973.44 85.39 4973.42 85.42 4973.42 86.39 4973.5 86.52 4973.36 86.71 4973.68 86.85 4973.85 86.88 4973.85 86.97 4973.81 86.98 4973.81 87.05 4973.81 87.08 4973.81 89.84 4973.88 93.27 4974.09 95.28 4974.27 96.53 4974.34 97.34 4974.36 98.5 4974.38 98.6 4981 Manning's n Values num= 3 Sta n Val Sta n Val Sta n Val ' 0 .016 3.76 .016 96.53 .016 Bank Sta: Left Right Lengths: Left Channel Right .Coeff Contr. Expan. 3.76 96.53 92.8 92.8 92.8 .1 .3 CROSS SECTION OUTPUT Profile $PF 1 E.G. Elev (ft) 4974.08 Element Left OB Channel Right OB Vel Head (ft) 0.12 Wt. n-Val. - 0.016 W.S. Elev (ft) 4973.96 Reach Len. (ft) 92.80 92.80 92.80 Crit W.S. (ft) 4973.96 Flow Area (sq ft) 4.49 E.G. Slope (ft/ft) 0.006697 Area (sq ft) 4.49 Q Total (cfs) 12.50 Flow (cfs) 12.50 Top Width (ft) 19.85 Top Width (ft) 19.85 Vel Total (ft/s) 2.79 Avg. Vel..(ft/s) 2.79 Max Chl Dpth (ft) 0.60 Hydr. Depth (ft) 0.23 _ Conv. Total (cfs) 152.7 Conv. (cfs) 152.7 Length Wtd. (ft) 92.80 Wetted Per. (ft) 20.23 Min Ch E1 (ft) 4973.36 Shear (lb/sq ft) 0.09 Alpha 1.00 Stream Power (lb/ft s) 0.26 Frctn Loss (ft) 0.01 Cum Volume (acre-ft) 0.04 0.00 C 5 E Loss (ft) 0.04 Cum SA (acres) 0.12 0.00 Warning: The energy equation could not be balanced within the specified number of iterations. The program used critical depth for the water surface and continued on with the calculations. Warning: Divided flow computed for this cross -'section. Warning: The conveyance ratio (upstream conveyance divided by downstream conveyance) is less than 0.7 or greater than 1.4. This may indicate the need for additional cross sections. Warning: During the standard step iterations, when the assumed water surface was set equal tc critical depth, the calculated t I FORT COLLINS HOTEL WALNUT STREET AND CHESTNUT STREET HYDRAULICS; PROPOSED CONDITION MODEL NORTHERN ENGINEERING; October 31, 2016 Page 5 of 11 water surface came back below critical depth. This indicates that there is not a valid subcritical answer. The program defaulted to critical depth. ' CROSS SECTION RIVER: Chestnut Split REACH: 1 RS: 5 INPUT Description: Station Elevation Data num= 38 Sta Elev Sta Elev Sta Elev Sta Elev Sta Elev 0 4984 .1 4974.3 .35 497.4.3 .56 4974.29 2.23 4974.12 2.42 4974.11 6.07 4973.84 12.55 4973.47 12.65 4973.33 13.17 4972.86 13.47 4972.87 13.88 4972.91 14.63 4972.96 15.38 4973.06 15.4 4973.07 25 4973.46 28.59 4973.55 30.63 4973.56 37.17 4973.56 50.1 4973.57 50.37 4973.57 51.25 4973.58 68.28 4973.4 69.81 4973.38 73.77 4973.17 86.76 4972.5 88.44 4972.37 88.89 4972.35 89.35 4973.03 89.41 4973.12 90.25 4972.91 91.76 4972.98 93.98 4973.3 95.38 4973.3 96.53 4973.35 99.83 4973.44 100.1 4973.45 100.2 4984 Manning's n Values num= 3 Sta n Val Sta n Val Sta n Val 0 .016 6.07 .016 96.53 .016 Bank Sta: Left Right Coeff Contr. Expan. 6.07 96.53 .1 .3 CROSS SECTION OUTPUT Profile @PF 1 E.G. Elev (ft) 4973.71 Element - Left OB Channel Right OB Vel Head -(ft) 0.00 Wt. n-Val. 0.016 0.016 W.S. Elev (ft) 4973.71 Reach Len. (ft) Crit W.S. (ft) 4973.03 Flow Area (sq ft) 35.50 1.11 E.G. Slope (ft/ft) 0.000047 Area (sq ft) 35.50 1.11 Q Total (cfs) 12.50 Flow (cfs) 12.19 0.31 Top Width (ft) 91.76 Top Width (ft) 88.18 3.57 Vel Total (ft/s) 0.34 Avg. Vel. (ft/s) 0.34 0.28 Max Chl Dpth (ft) 1.36 Hydr.-Depth (ft) 0.40 0.31 Conv. Total (cfs) 1832.6 Conv. (cfs) 1787.3 45.2 Length Wtd. (ft) Wetted Per. (ft) 88.95 3.83 Min Ch El (ft) 4972.35 Shear (lb/sq ft) 0.00 0.00 Alpha 1.00 Stream Power (lb/ft s) 0.00 0.00 Frctn Loss (ft) Cum Volume (acre-ft) C 6 E Loss (ft) Cum SA (acres) ' CROSS SECTION I 1 I .1 RIVER: Mountain Split REACH: 1 RS: 20 INPUT Description: Station Elevation Data num= Sta Elev Sta Elev 7.25 4978.23 11.84 4978.11 18.95 4976.97 19.39 4976.54 38.06 4976.66 38.09 4976.66 39.8 4976.68 39.85 4976.63 49.69 4976.39 52.51 4976.38 66.23 4975.83 66.56 4975.83 71.09 4976.52 71.24 4976.5 75.62 4976.53 80 4976.68 37 Sta Elev Sta Elev Sta Elev 12.27 4978.08 12.74 4978.03 18.87 4977.05 19.68 4976.56 21.38 4976.68 26.56 4976.67 38.1 4976.66 38.53 4976.67 38.93 4976.68 40 4976.63 41.56 4976.64 45.49 4976.46 62.19 4976.2 64.02 4976.18 65.86 4975.88 66.78 4976.08 67.15 4976.5 69.14 4976.51 72.64 4976.36 73.48 4976.41 74.36 4976.47 I d 7 L 1 FORT COLLINS HOTEL WALNUT STREET AND CHESTNUT STREET HYDRAULICS; PROPOSED CONDITION MODEL NORTHERN ENGINEERING; October 31, 2016 Page 6 of it Manning's n Values num= 3 " Sta n Val Sta n Val Sta n Val 7.25 .016 11.84 .016 75.62 .016 f Bank Sta: Left Right Lengths: Left Channel Right Coeff Contr. Expan. 11.84 75.62 179.3 179.3 179.3 .1 .3 " CROSS SECTION OUTPUT Profile $PF 1 E.G. Elev (ft) 4976.90 Element Left OB Channel Right OB Vel Head (ft) 0.15 Wt. n-Val. 0.016 0.016 W.S. Elev (ft) 4976.76 Reach Len. (ft) 179.30 179.30 179.30 Crit W.S. (ft) 4976.76 Flow Area (sq ft) 15.70 0.67 E.G. Slope (ft/ft) 0.006195 Area (sq ft) 15.70 0.67 Q Total (cfs) 50.00 Flow (cfs) 48.63 1.37 Top Width (ft) 60.83 Top Width (ft) 56.45 4.38 Vel Total (ft/s) 3.06 Avg. Vel. (ft/s) 3.10 2.06 Max Chl Dpth (ft) 0.93 Hydr. Depth (ft) 0.28 0.15 Conv. Total (cfs) 635.2 Conv. (cfs) 617.8 17.5 Length Wtd. (ft) 179.30 Wetted Per. (ft) 56.92 4.46 Min Ch E1 (ft) 4975.83 Shear (lb/sq ft) 0.11 0.06 Alpha 1.01 Stream Power (lb/ft s) 0.33 0.12 Frctn Loss (ft) 0.20 Cum Volume (acre-ft) 0.00 0.12 0.00 C s E Loss (ft) 0.04 Cum SA (acres) 0.00 0.33 0.01 Warning: The energy equation could not be balanced within the specified number of iterations. The program used critical depth for the water surface and continued on with the calculations. Warning: The cross-section end points had to be extended vertically for the computed water surface. Warning: The conveyance ratio (upstream conveyance divided by downstream conveyance) is less than 0.7 or greater than 1.4. This may indicate the need for additional cross sections. Warning: During the standard step iterations, when the assumed water surface was set equal to critical depth, the calculated water surface came back below critical depth. This indicates that there is not a valid subcritical answer. The program defaulted to critical depth. CROSS SECTION RIVER: Mountain Split REACH: 1 RS: 10 INPUT Description: Station Elevation Data num= 61 Sta Elev Sta Elev Sta Elev 0 4981 .1 4975.92 1.42 4975.93 14.56 4975.4 16.97 4975.33 17.37 4975.03 19.58 4975.01 19.61 4975 22.89 4975.25 27.47 4975.48 32.38 4975.69 34.39 4975.78 35.44 4975.8 39.92 4975.91 41.77 4975.94 58.88 4976.26 60.92 4976.22 62.38 4976.23 65.81 4976.23 67.99 4976.22 69.08 4976.19 74.69 4977.01 75.43 4976.95 76.47 4976.87 79.89 4976.19 79.99 4975.98 83.06 4976 106.07 4975.78 110.29 4975.67 112.77 4975.61 123.21 4975.22 123.36 4975.36 123.71 4975.72 128.27 4975.79 128.62 4975.78 128.76 4975.8 129 4981 Manning's n Values num= 3 Sta n Val Sta n Val Sta n Val Sta Elev 9.93 4975.63 17.58 4974.86 23.47 4975.28 34.67 4975.79 48.53 4976.15 63.6 4976.25 74.15 4975.99 77.6 4976.84 94.01 4976.12 121.21 4975.39 126.88 4975.77 128.87 4976.13 Sta Elev 12.88 4975.5 19.22 4974.97 27.21 4975.47 35.43 4975.78 53.97 4976.21 64.06 4976.25 74.66 4976.96 79.53 4977.05 100.59 4975.94 121.8 4975.34 128.14 4975.78 128.91 4975.79 I 1 11 H FORT COLLINS HOTEL WALNUT STREET AND CHESTNUT STREET HYDRAULICS; PROPOSED CONDITION MODEL NORTHERN ENGINEERING; October 31, 2016 1 Page 7 of 11 0 .016 1.42 .016 126.88 .016 Bank Sta: Left Right Coeff Contr. Expan. 1.42 126.88 .1 .3 CROSS SECTION OUTPUT Profile @PF 1 E.G. Elev (ft) 4976.20 Vel Head (ft) 0.02 t• W.S. Elev (ft) 4976.18 Crit W.S. (ft) 4975.82 E.G. Slope (ft/ft) 0.000462 Q Total (cfs) 50.00 Top Width (ft) 105.12 Vel Total (ft/s) 1.12 Max Chl Dpth (ft) 1.32 Conv. Total (cfs) 2325.6 Length Wtd. (ft) Min Ch E1 (ft) 4974.86 Alpha 1.01 Frctn Loss (ft) C & E Loss (ft) " Element Wt. n-Val. Reach Len. (ft) Flow Area (sq ft) Area (sq ft) Flow (cfs) Top Width (ft) Avg. Vel. (ft/s) Hydr. Depth (ft) Conv. (cfs) Wetted Per. (ft) Shear (lb/sq ft) Stream Power (lb/ft s) Cum Volume (acre-ft) Cum SA (acres) Warning: Divided flow computed for this cross-section. CROSS SECTION Left OB Channel Right OB 0.016 0.016 0.016 0.34 43.52 0.79 0.34 43.52 0.79 0.24 49.11 0.65 1.33 101.76 2.04 0.71 1.13 0.83 0.25 0.43 0.39 11.2 2284.1 30.3 1.58 102.45 2.96 0.01 0.01 0.01 0.00 0.01 0.01 RIVER: Walnut REACH: 1 RS: 20 INPUT Description: Effective Model Section 2+58 Station Elevation Data num= 13 Sta Elev Sta Elev Sta Elev Sta Elev Sta Elev 100 4981.18 100.1 4979.08 106.2 4978.78 116 4978.32 116.2 4977.9 118.3 4977.77 141.2 4979.02 153.9 4979.2 165.7 4979.02 191.3 4978.48 191.6 4978.98 203.6 4979.18 203.7 4981.18 Manning's n Values num= 3 Sta n Val Sta n Val Sta n Val 100 .016 106.2 .016 203.6 .016 Bank Sta: Left Right Lengths: Left Channel Right Coeff Contr. Expan. 106.2 203.6 183.3 183.3 183.3 .1 .3 CROSS SECTION OUTPUT Profile BPF 1 E.G. Elev (ft) 4979.00 Element Left OB Channel Right OB Vel Head (ft) 0.19 Wt. n-Val. 0.016 0.016 W.S. Elev (ft) 4978.80 Reach Len. (ft) 183.30 183.30 183.30 Crit W.S. (ft) 4978.80 Flow Area (sq ft) 0.01 16.96 E.G. Slope (ft/ft) 0.005655 Area (sq ft) 0.01 16.96 Q Total (cfs) 60.00 Flow (cfs) 0.00 60.00 Top Width (ft) 47.06 Top Width (ft) 0.49 46.58 Vel Total (ft/s) 3.54 Avg. Vel. (ft/s) 0.36 3.54 Max Chl Dpth (ft) 1.03 Hydr. Depth (ft) 0.01 0.36 Conv. Total (cfs) 797.9 Conv. (cfs) 0.0 797.9 Length Wtd. (ft) 183.30 Wetted Per. (ft) 0.49 47.07 Min Ch El (ft) 4977.77 Shear (lb/sq ft) 0.00 0.13 Alpha 1.00 Stream Power (lb/ft s) 0.00 0.45 Frctn Loss (ft) 0.99 Cum Volume (acre-ft) 0.00 0.14 0.01 C & E Loss (ft) 0.02 Cum SA (acres) 0.00 0.30 0.04 11 I FORT COLLINS HOTEL WALNUT STREET AND CHESTNUT STREET HYDRAULICS; PROPOSED CONDITION MODEL NORTHERN ENGINEERING; October 31, 2016 Page 8 of 11 Warning: The energy equation could not be balanced within the specified number of iterations. The program used critical depth for the water surface and continued on with the calculations. Warning: Divided flow computed for this cross-section. Warning: The energy loss was greater than 1.0 ft (0.3 m). between the current and previous cross section. This may indicate the need for additional cross sections. Warning: During the standard step iterations, when the assumed water surface was set equal to critical depth, the calculated water surface came back below critical depth. This indicates that there is not a valid subcritical answer. The program defaulted to critical depth. ' CROSS SECTION n 1] RIVER: Walnut REACH: 1 RS: 15 INPUT Description: - Station Elevation Data num= 45 Sta Elev Sta Elev Sta Elev Sta Elev Sta Elev 0 4981 .1 4977.19 .64 4977.17 7.39 4977.04 7.41 4977.04 7.46 4976.98 7.91 4976.54 9.68 4976.69 9.91 4976.7 9.93 4976.7 25.37 4977.32 28.24 4977.37 38.58 4977.58 44.11 4977.69 46.18 4977.72 46.6 4977.71 54.9 4977.52 62.06 4977.31 66.97 4977.2 67.12 4977.2 68.6 4977.15 71.42 4977.07 72.77 4977 74.13 4976.91 74.79 4977.24 74.98 4977.36 74.99 4977.38 76.48 4977.56 77.63 4977.34 78.24 4977.33 80.15 4977.33 80.23 4977.19 80.25 4977.18 81.82 4977.25 82.66 4977.29 83.28 4977.33 86.58 4977.33 89.45 4977.36 91.08 4977.32 91.47 4977.32 92.26 4977.32 98.6 4977.28 99.55 4977.28 101.6 4977.29 101.7 4981.4 Manning's n Values num= 3 Sta n Val Sta n Val Sta n Val 0 .016 0 .016 89.45 .016 Bank Sta: Left Right Lengths: Left Channel Right Coeff Contr. Expan. 0 89.45 44 44 44 .1 .3 CROSS SECTION OUTPUT Profile @PF 1 E.G. Elev (ft) 4977.60 Element Left OB Channel Right OB Vel Head (ft) 0:13 Wt. n-Val. 0.016 0.016 W.S. Elev (ft) 4977.47 Reach Len. (ft) 44.00 .44.00 44.00 Crit W.S. (ft) 4977.47 Flow Area (sq ft) 19.13 2.07 E.G. Slope (ft/ft) 0.005126 Area (sq ft) 19.13 2.07 Q Total (cfs) 60.00 Flow (cfs) 55.80 4.20 Top Width (ft) 77.20 Top Width (ft) 65.05 12.15 Vel Total (ft/s) 2.83 Avg. Vel. (ft/s) 2.92 2.03 Max Chl Dpth (ft) - 0.93 Hydr: Depth (ft) 0.29 0.17 Conv. Total (cfs) 838.0 Conv. (cfs) 779.4 58.6 Length Wtd. (ft) 44.00 Wetted Per. (ft) 65.79 12.33 Min Ch E1 (ft) 4976.54 Shear (lb/sq ft) 0.09 0.05 Alpha 1.02 Stream Power-(lb/ft s) 0.27 0.11 Frctn Loss (ft) 0.16 Cum Volume (acre-ft) 0.06 0.01 C S E Loss (ft) 0.01 Cum SA (acres) 0.07 0.01 Warning: The energy equation could not be balanced within the specified number of iterations. The program used critical depth for the water surface and continued on with the calculations. Warning: Divided flow computed for this cross-section. Warning: During the standard step iterations, when the assumed water surface was set equal to critical depth, the calculated water surface came back below critical depth. This indicates that there. is not a valid subcritical answer. The FORT COLLINS HOTEL WALNUT STREET AND CHESTNUT STREET HYDRAULICS; PROPOSED CONDITION MODEL ' NORTHERN ENGINEERING; October 31, 2016 Page 9 of 11 program defaulted to critical depth. CROSS SECTION ' RIVER: Walnut REACH: 1 RS: 10 INPUT Description: - Station Elevation Data num= 46 Sta Elev Sta Elev Sta Elev Sta Elev Sta Elev 0 4981 .1 4976.7 7.78 4976.07 8.06 4976.07 5.34 4976.6 7.23 9.76 4976.23 9.91�4976.24 4976.56 7.6 10.03 4976.18 4976.25 21.67 4976.61 24.21 4976.68 28.24 4976.97 38.58 4977.18 44.11 4977.29 . 46.18 4977.32 46.6 4977.31 54.9 4977.12 62.06 4976.91 66.97 4976.8 67.12 4976.8 68.6 4976.75 71.42 4976.67 72.77 4976.6 74.13 4976.51 74.79 4976.84 74.98 4976.96 74.99 4976.98 76.48 4977.16 77.63 4976.94 ' 78.24 4976.93 80.15 4976.93 80.23 4976.79 80.25 4976.78 81.82 4976.85 82.66 4976.89 83.28 4976.93 86.58 4976.93 89.45 4976.96 91.08 4976.92 91.47 4976.92 92.26 4976.92 98.6 4976.88 99.55 4976.88 101.6 4976.89 ' 101.7 4981 Manning's n Values num= 3 Sta n Val Sta n Val Sta n Val 0 .016 0 .016 89.45 .016 ' Bank Sta: Left Right Coeff Contr. Expan. 0 89.45 .1 .3 ' CROSS SECTION OUTPUT Profile IPF 1 E.G. Elev (ft) 4977.18 Element Left OB Channel Right OB Vel Head (ft) 0.09 Wt. n-Val. 0.016 0.016 W.S. Elev (ft) 4977.09 Reach Len. (ft) Crit W.S. (ft) 4977.03 Flow Area (sq ft) 23.29 2.29 ' E.G. Slope (ft/ft) 0.002809 Area (sq ft) 23.29 2.29 Q Total (cfs) 60.00 Flow (cfs) 56.34 3.66 Top Width (ft) 78.91 Top Width (ft) 66.75 12.15 ' Vel Total (ft/s) 2.35 Max Chl Dpth (ft) 1.02 Avg. Vel. (ft/s) Hydr. Depth (ft) 2.42 0.35 1.60 0.19 Conv. Total (cfs) 1132.0 Conv. (cfs) 1063.0 69.0 Length Wtd. (ft) Wetted Per. (ft) 67.60 12.35- Min Ch E1 (ft) 4976.07 Shear (lb/sq ft) 0.06 0.03 Alpha 1.03 Stream Power (lb/ft s) 0.15 0.05 Frctn Loss (ft) 0.27 Cum Volume (acre-ft) 0.04 0.00 C 6 E Loss (ft) 0.01 Cum SA (acres) Warning: Divided flow computed for this cross-section. Warning: A flow split was encountered. The program first calculated the momentum of both channels below the junction. An energy balance was performed across the junction from the stream with the highest momentum downstream to the section upstream. SUMMARY OF MANNING'S N VALUES River:Chestnut Split Reach River Sta. nl n2 n3 1 30 .016 .016 .016 1 20 .016 .016 .016 1 1 10 .016 .016 .016 FORT COLLINS HOTEL WALNUT STREET AND CHESTNUT STREET HYDRAULICS; PROPOSED CONDITION MODEL NORTHERN ENGINEERING; October 31, 2016 Page 10 of 11 1 5 .01:6 .016 .016 River:Mountain Split Reach River Sta. nl n2 n3 1 20 .016 .016 .016 1 10 .016 .016 .016 River:Walnut Reach River Sta. nl n2 n3 1 20 .016 .016 .016 1 15 .016 .016 .016 1 10 .016 .016 .016 SUMMARY OF REACH LENGTHS River: Chestnut Split Reach River Sta. Left Channel Right 1 30 '- 224.9 224.9 224.9 1 20 113.1 113.1 113.1 1 10 92.8 92.8 92.8 1 5 River: Mountain Split Reach River Sta. Left Channel Right 1 20 179.3 179.3 179.3 1 10 River: Walnut Reach River Sta. Left Channel Right 1 20 - 183.3 183.3 183.3 1 15 44 44 44 1 10 SUMMARY OF CONTRACTION AND EXPANSION COEFFICIENTS River: Chestnut Split Reach River Sta. Contr. Expan. 1 30 .1 .3 1 20 .1 .3 1 10 .1 .3 1 5 .1 .3 River: Mountain Split ' FORTCOLUNSHOTEL WALNUT STREETAND CHESTNUT STREET HYDRAULICS; PROPOSED CONDITION MODEL ' NORTHERN ENGINEERING; October 31, 2016 Page 11 of 11 ' Reach River Ste. Contr. Expan. 1 20 .1 .3 ' 1 River: Walnut 10 .1 .3 ' Reach River Sta. Contr. Expan. 1 20 .1 .3 1 15 -.1 .3 ' 1 10 .1 .3 Profile Output Table - Standard Table 1 River Reach River Sta Profile Q Total Min Ch.El W.S. Elev W.S. E.G. Elev E.G. Slope Vel Chnl Flow Area Top Width Froude i Chl (cfs) (ft) (ft) (ft) (ft) (ft/ft) (ft/s) (sq ft) (ft) ' Chestnut Split 1 5 PF 1 12.50 4972.35 4973.71 4973.03 4973.71 0.000047 0.34 36.61 91.76 0.10 Chestnut Split 1 10 PF 1 12.50 4973.36 4973.96 4973.96 4974.08 0.006697 2.79 4.49 19.85 1.03 Chestnut Split 1 20 PF 1 12.50 4974.75 4975.18 ' 4975.18 4975.28 0.006447 2.61 4.80 22.43 0.99 Chestnut Split 1 30 PF 1 10.00 4976.18 4976.58 4976.57 4976.68 0.005963 2.56 3.91 17.99 0.97 ' Mountain Split 1 4975.82 4976.20 0.000462 10 1.13 PF 1 44.65 50.00 105.12 4974.86 4976.18 0.30 Mountain Split 1 20 PF 1 50.00 4975.83 4976.76 4976.76 4976.90 0.006195 3.10 16.37 60.83 1.04 Walnut 1 10 PF 1 60.00 4976.07 4977.09 4977.03 4977.18 0.002809 2.42 25.58 78.91 0.72 ' Walnut 1 15 PF 1 60.00 4976.54 4977.47 4977.47 4977.60 0.005126 2.92 21.20 77.20 0.95 Walnut 1 20 PF 1 60.00 4977.77 4978.80 ' 4978.80 4979.00 0.005655 3.54 16.97 47.06 1.03 1 Profile Output Table - Standard Table 2 River Reach River Sta Profile E.G. Elev W.S. Elev Vel Head ' Frctn Loss C 6 E Loss Q Left Q Channel Q Right Top Width (ft) (ft) (ft) (ft) (ft) (cfs) (cfs) (cfs) (ft) ' Chestnut Split 1 5 PF 1 _ 4973.71 4973.71 0.00 12.19 0.31 91.76 Chestnut Split 1 10 PF 1 4974.08 4973.96 0.12 0,01 0.04 12.50 19.85 Chestnut Split 1 20 PF 1 4975.28 4975.18 0.11 ' 0.74 0.00 12.50 22.43 Chestnut Split 1 30 PF 1 4976.68 4976.58 0.10 1.40 0.00 10.00 17.99 Mountain Split 1 10 PF 1 4976.20 4976.18 0.02 ' 0.24 49.11 0.65 105.12 Mountain Split 1 20 PF 1 4976.90 4976.76 0.15 0.20 0.04 48.63 1.37 60.83 Walnut 1 10 'PF 1 1977.18 4977.09 0,09 0.27 0.01 56.34 3.66 78.91 ' Walnut 1 15 PF 1 4977.60 4977.47 0.13 0.16 0.01 55.80 4.20 77.20 Walnut 1 20 PF 1 4979.00 4978.80 0.19 ' 0.99 0.02 0.00 60.00 47.06 Crit ATTACHMENT 3.3 Proposed Condition HEC-RAS Modeling Output —Jefferson Street ' FORT COLLINS HOTEL 11111RION STREET HYDRAULICS; PROPOSED CONDITION MODEL ' NORTHERN ENGINEERING; JUNE 15, 2015 Page 1 of 6 HEC-RAS Version 4.1.0 Jan 2010 U.S. Army Corps of Engineers 1 Hydrologic Engineering Center 609 Second Street Davis, California ' X X XXXXXX XXXX XXXX XX XXXX X X X X X X X X X X X X X X X X X X X XXXXXXX XXXX X XXX XXXX XXXXXX XXXX ' X X X X X X X X X X X X X X X X X X X X X XXXXXX XXXX X X X X XXXXX ' PROJECT DATA Project Title: Jefferson Street - 100yr-Proposed t Project File : Jeff_NE.prj Run Date and Time: 6/29/2015 1:31:30 PM Project in English units ' PLAN DATA ' Plan Title: Plan 01 Plan File : d:\Projects\947-002\Drainage\Modeling\HEC-RAS\HEC-RAS-Proposed Cond-2015-06- 02\Jeff_NE.p01 Geometry Title: Jefferson Street t Geometry File : d:\Projects\947-002\Drainage\Modeling\HEC-RAS\HEC-RAS-Proposed Cond- 2015-06-02\Jeff NE.g01 Flow Title : Jefferson Street-100yr Flow File : d:\Projects\947-002\Drainage\Modeling\HEC-RAS\HEC-RAS-Proposed Cond- 2015-06-02\Jeff_NE.f01 Plan Summary Information: Number of: Cross Sections = 4 Multiple Openings = 0 Culverts 0 Inline Structures = 0 Bridges 0 Lateral Structures = 0 Computational Information ' Water surface calculation tolerance = 0.01 Critical depth calculation tolerance = 0.01 Maximum number of iterations = �20 Maximum difference tolerance = 0.3 Flow tolerance factor = 0.001 Computation Options Critical depth computed only where necessary Conveyance Calculation Method: At breaks in n values only ' Friction Slope Method: Average Conveyance Computational Flow Regime: Subcritical Flow FLOW DATA - Flow Title: Jefferson Street-100yr I 1 1 1 FORT COLLINS HOTEL JEFFERSON STREET HYDRAULICS; PROPOSED CONDITION MODEL NORTHERN ENGINEERING; JUNE 15, 2015 Page 2 of 6 Flow File : d:\Projects\947-002\Drainage\Modeling\HEC-RAS\HEC-RAS-Proposed Cond-2015-06- 02\Jeff_NE.f01 Flow Data (cfs) River Reach RS PF 1 Jefferson 1 - 40 24.1 Boundary Conditions River Reach Profile Upstream Downstream Jefferson 1 PF 1 Normal S = 0.0076 GEOMETRY DATA Geometry Title: Jefferson Street Geometry File : d:\Projects\947-002\Drainage\Modeling\HEC-RAS\HEC-RAS-Proposed Cond-2015-06- 02\Jeff NE.g01 CROSS SECTION RIVER: Jefferson REACH: 1 RS: 40 INPUT Description: Station Elevation Data num= 62 Sta Elev Sta Elev Sta Elev Sta Elev Sta Elev 0 4976.32 8.91 4976.14 8.96 4976.12 9.35 4976.04 11.03 4975.87 15.82 4976.56 16.19 4976.56 27.93 4976.13 28.19 4976.13 28.47 4976.09 28.5 4976.09 28.9 4975.52 28.94 4975.44 29 4975.51 29.3 4975.42 29.38 4976.1 29.44 4976.13 29.62 4976.13 29.8 4976.12 29.85 4975.8 47.44 4976.12 49 4976.14 50.2 4976.02 51.93 4975.94 58.12 4975.88 58.96 4975.88 64.3 4975.72 65.03 4975.7 68.09 4975.78 68.29 4975.78 69.11 4975.8 70.45 4975.79 70.73 4975.51 71.02 4975.29 71.75 4975.26 72.86 4975.26 81.5 4975.71 84.96 4975.89 89.21 4975.98 100 4976.21 100.19 4976.21 105.26 4976.17 109.83 4976.15 125.19 4975.73 127.61 4975.63 129.03 4975.58 129.37 4975.57 129.39 4975.59 129.43 4975.6 130.13 4975.89 130.64 4975.91 133.67 4976.01 141.4 4976.28 141.41 4976.32 143.56 4976.26 151.65 4976.31 164.98 4976.7 172.53 4976.68 187.79 4976.56 194.5 4976.55 196.66 4976.56 200 4976.58 Manning's n Values num= 3 Sta n Val Sta n Val Sta n Val 0 .016 68.09 .016 133.67 .016 Bank Sta: Left Right Lengths: Left Channel Right Coeff Contr. Expan. 68.09 133.67 151 151 151 .1 .3 Blocked Obstructions num= 2 Sta L Sta R Elev Sta L Sta R Elev 0 64 4984 141 200 4984 CROSS SECTION OUTPUT Profile $PF 1 E.G. Elev (ft) 4976.04 Element Left OB Channel Vel Head (ft) 0.13 Wt. n-Val. 0.016 0.016 W.S. Elev (ft) 4975.91 Reach Len. (ft) 151.00 151.00 Crit W.S. (ft) 4975.91 Flow Area (sq ft) 0.74 7.69 E.G. Slope (ft/ft) 0.006199 Area (sq ft) 0.74 7.69 Right OB 151.00 ' FORT COLLINS HOTEL JEFFERSON STREET HYDRAULICS; PROPOSED CONDITION MODEL . , NORTHERN ENGINEERING; JUNE 15,2015 Page 3 of 6 ' Q Total (cfs) 24.10 Flow (cfs) 1.67 22.43 Top Width (ft) 34.34 Top Width (ft) 4.09 30.25 Vel Total (ft/s) 2.86 Avg. Vel. (ft/s) 2.26 2.92 ' Max Chl Dpth (ft) Conv. Total (cfs) 0.65 306.1 Hydr. Depth (ft) Conv. (cfs) 0.18 21.2 0.25 284.9 Length Wtd. (ft) 151.00 Wetted Per. (ft) 4.28 30.53 Min Ch El (ft) 4975.26 Shear (lb/sq ft) 0.07 0.10 Alpha 1.01 Stream Power (lb/ft s) 200.00 0.00 0.00 Frctn Loss (ft) 0.88 Cum Volume (acre-ft) 0.00 0.08 0.01 ' C & E Loss (ft) 0.00 Cum SA (acres) 0.03 0.31 0.03 Warning: The energy equation could not be balanced within the specified number of iterations. The program used critical depth for the water surface and continued on with the calculations. Warning: Divided flow computed for this cross-section. Warning: The energy loss was greater than 1.0 ft (0.3 m). between the current and previous cross section. This may indicate the ' need for additional cross sections. Warning: During the standard step iterations, when the assumed water surface was set equal to critical depth, the calculated water ' surface came back below critical subcritical answer. The program depth. This indicates that there is not a valid defaulted to critical depth. CROSS SECTION ' RIVER: Jefferson REACH: 1 RS: 30 ' INPUT Description: Station Elevation Data num= 33 Sta Elev Sta Elev Sta Elev Sta Elev Sta Elev 63.9. 4984 64 4974.57 65.12 4974.58 69.52 4974.67 70.39 4974.63 ' 70.4 4974.58 70.58 4974.5 71 4974.17 71.92 4974.1 72.69 4974.14 80.06 4974.45 85.13 4974.69 85.31 4974.7 96.96 4975.03 100 4975.05 100.04 4975.05 103.48 4975.04 105.43 4974.98 109.65 4974.84 122.4 4974.58 - , 122.48 4974.63 124.48 129.39 4974.47 129.68 4974.52 127.25 4974.79 130.15 4974.32 128.28 4974.71 130.23 4974.26 129.17 4974.71 132.98 4974.2 4974.87 135.57 4974.96 141 4975.04 141.1 4984 Manning's n Values num= 3 Sta n Val Sta n Val Sta n Val - ' 63.9 .016 69.52 .016 132.98 .016 Bank Sta: Left Right Lengths: Left Channel Right Coeff Contr. Expan. 69.52 132.98 135 135 135 .1 .3 CROSS SECTION OUTPUT Profile #PF 1 E.G. Elev (ft) 4974.85 Element Left OB Channel Right OB Vel Head (ft) 0.11 Wt. n-Val. 0.016 0.016 ' W.S. Elev (ft) 4974.74 Reach Len. (ft) 135.00 135.00 135.00 Crit W.S. (ft) 4974.74 Flow Area (sq ft) 0.69 8.40 E.G. Slope (ft/ft) 0.005478 Area (sq ft) 0.69 8.40 Q Total (cfs) 24.10 Flow (cfs) 1.16 22.94 ' Top Width (ft) 38.55 Top Width (ft) 5.52 33.03 Vel Total (ft/s) 2.65 Avg. Vel. (ft/s) 1.68 2.73 Max Chl Dpth (ft) 0.64 Hydr. Depth (ft) 0.12 0.25 Conv. Total (cfs) 325.6 Conv. (cfs) 15.7 309.9 Length Wtd. (ft) 135.00 Wetted Per. (ft) 5.69 33.50 ' Min Ch El (ft) 4974.10 Shear (lb/sq ft) 0.04 0.09 Alpha 1.03 Stream Power (lb/ft s) 141.10 0.00 0.00 Frctn Loss (ft) 0.74 Cum Volume (acre-ft) 0.00 0.05 0.01 C & E Loss (ft) 0.00 Cum SA (acres) 0.01 0.20 0.03 1 FORT COLLINS HOTEL JEFFERSON STREET HYDRAULICS; PROPOSED CONDITION MODEL NORTHERN ENGINEERING; JUNE 1S, 201S Page 4 of 6 Warning: The energy equation could not be balanced within the specified number of iterations. The program used critical depth for the water surface and continued on with the calculations. Warning: Divided flow computed for this cross-section. Warning: The energy loss was greater than 1.0 ft (0.3 m). between the current and previous cross section. This may indicate the need for additional cross sections. Warning: During the standard step iterations, when the assumed water surface was set equal to critical depth, the calculated water surface came back below critical depth. This indicates that there is not a valid subcritical answer. The program defaulted to critical depth. CROSS SECTION ' RIVER: Jefferson REACH: 1 RS: 20 J INPUT Description: Station Elevation Data num= 27 Sta Elev Sta Elev Sta Elev Sta Elev Sta Elev 63.9 4984 64 4974.15 66.18 4973.98 68.96 4973.95 70.58 4973.88 70.89 4973.4 71.12 4973.12 72.51 4973.17 72.87 4973.18 85.09 4973.67 93.85 4973.86 99.78 4973.99 100 4973.99 110.73 4973.9 110.89 4973.9 110.94 4973.9 125.63 4973.42 126.52 4973.37 127.59 4973.29 127.9 4973.26 128.73 4973.22 128.93 4973.43 129.32 4973.63 131.52 4973.59 132.56 4973.58 141 4973.43 141.1 4984 Manning's n Values num= 3 Sta n Val Sta n Val Sta n Val 63.9 .016 68.96 .016 131.52 .016 Bank Sta: Left Right Lengths: Left Channel Right Coeff Contr. Expan. 68.96 131.52 148 148 148 .1 .3 CROSS SECTION OUTPUT Profile NPF 1 E.G. Elev (ft) 4973.81 Element Left OB Channel Right OB Vel Head (ft) 0.10 Wt. n-Val. 0.016 0.016 W.S. Elev (ft) 4973.71 Reach Len. (ft) 148.00 148.00 148.00 Crit W.S. (ft) 4973.69 Flow Area (sq ft) 7.50 1.86 E.G. Slope (ft/ft) '0.005509 Area (sq ft) 7.50 1.86 Q Total (cfs) 24.10 Flow (cfs) 19.86 4.24 Top Width (ft) 40.50 Top Width (ft) 31.01 9.48 Vel Total (ft/s) 2.58 Avg. Vel. (ft/s) 2.65 2.28 Max Chl Dpth (ft) 0.59 Hydr. Depth (ft) 0.24 0.20 Conv. Total (cfs) 324.7 Conv. (cfs) 267.5 57.2 Length Wtd. (ft) 148.00 Wetted Per. (ft) 31.48 9.76 Min Ch El (ft) 4973.12 Shear (lb/sq ft) 0.08 0.07 Alpha 1.01 Stream Power (lb/ft s) 141.10 0.00 0.00 Frctn Loss (ft) 0.83 Cum Volume (acre-ft) 0.00 0.03 0.00 C 6 E Loss (ft) 0.00 Cum SA (acres) 0.00 0.10 0.02 Warning: Divided flow computed for this cross-section. CROSS SECTION RIVER: Jefferson REACH: 1 RS: 10 INPUT ' FORT COLLINS HOTEL JEFFERSON STREET HYDRAULICS; PROPOSED CONDITION MODEL \ ' NORTHERN ENGINEERING; JUNE 15, 2015 Page 5 of 6 ' Description: Station Elevation Data num= 42 Sta Elev Sta Elev Sta Elev Sta Elev Sta Elev ' 63.9 4983 64 70.7 4972.62 70.75 4973.25 4972.7 64.95 4972.84 67.88 71.02 4972.15 72.48 4972.66 4972.32 69.52 72.76 4972.6 4972.35 78.64 4972.65 88.5 4973.12 93.88 4973.23 99.79 4973.35 100 4973.35 113.85 4973.03 115.34 4972.99 116.12 4972.95 127.15 4972.35 128.54 4972.27 128.76 4972.44 128.89 4972.43 128.91 4972.44 128.99 4972.45 129.3 4972.33 129.74 4972.38 130.08 4972.51 130.8 4972.72 131.29 4972.77 132.43 4972.87 ' 132.54 4972.88 133.73 4972.86 134.24 4972.87 138.19 4973.02 138.3 4973.03 138.42 4973.01 138.91 4972.96 139.04 4973.12 140.93 4973.32 140.95 4973.32 141 4973.33 - 141.1 4983 ' Manning's n Values num= 3 Sta n Val Sta n Val Sta n Val 63.9 .016 67.88 .016 132.43 .016 Bank Sta: Left Right Coeff Contr. Expan. ' 67.88 132.43 .1 .3 CROSS SECTION OUTPUT Profile $PF 1 ' E.G. Elev (ft) 4972.98 Element Left OB Channel Vel Head (ft) 0.13 Wt. n-Val. 0.016 0.016 W.S. Elev (ft) 4972.84 Reach Len. (ft) Crit W.S. (ft) 4972.84 Flow Area (sq ft) 0.27 8.04 E.G. Slope (ft/ft) 0.005663 Area (sq ft) 0.27 8.04 ' Q Total (cfs) 24.10 Flow (cfs) 0.38 23.72 Top Width (ft) 31.69 Top Width (ft) 2.93 28.75 Vel Total (ft/s) 2.90 Avg. Vel. (ft/s) 1.41 2.95 Max Chl Dpth (ft) 0.69 Hydr. Depth (ft) 0.09 0.28 ' Conv. Total (cfs) 320.3 Conv. (cfs) 5.0 315.2 Length Wtd. (ft) Wetted Per. (ft) 2.94 29.33 Min Ch E1 (ft) 4972.15 Shear (lb/sq ft) 0.03 0.10 Alpha 1.02 Stream Power (lb/ft s) 141.10 0.00 Frctn Loss (ft) Cum Volume (acre-ft) ' C & E Loss (ft) Cum SA (acres) Right OB 0.00 ' Warning: Divided flow computed for this cross-section. Warning: Slope too steep for slope area to converge during supercritical flow calculations (normal depth is below critical depth). Water surface set to critical depth. ' SUMMARY OF MANNING'S N VALUES River:Jefferson ' Reach River Sta. nl n2 n3 1 40 .016 .016 .016 1 30 .016 .016 .016 ' 1 20 .016 .016 .016 1 10 .016 .016 .016 SUMMARY OF REACH LENGTHS River: Jefferson Reach River Sta. Left .Channel Right ' 1 40 . 151 151 151 FORT COLLINS HOTEL JEFFERSON STREET HYDRAULICS; PROPOSED CONDITION MODEL NORTHERN ENGINEERING; JUNE 15, 2015 Page 6 of 6 1 30 135 135 135 1 20 148 148 148 1 10 SUMMARY OF CONTRACTION AND EXPANSION COEFFICIENTS River: Jefferson Reach River Sta. Contr. Expan. 1 40 .1 .3 1 30 .1 .3 1 20 .1 .3 1 10 .1 .3 Profile Output Table - Standard Table 1 Reach River Sta Profile Q Total Min Ch El W.S. Elev Crit W.S. E.G. Elev E.G. Slope Vel Chnl Flow Area Top Width Froude # Chl (cfs) (ft) (ft) (ft) (ft) (ft/ft) A ft/s) (sq ft) (ft) 1 10 PF 1 24.10 4972.15 4972.84 4972.84 4972.98 0.005663 2.95 8.31 31.69 0.98 1 20 PF 1 24.10 4973.12 4973.71 4973.69 4973.81 0.005509 2.65 9.36 40.50 0.95 1 30 PF 1 24.10 4974.10 4974.74 4974.74 4974.85 0.005478 2.73 9.08 38.55 0.96 1 40 PF 1 24.10 4975.26 4975.91 4975.91 4976.04 0.006199 2.92 8.43 34.34 1.02 Profile Output Table - Standard Table 2 Reach River Sta Profile E.G. Elev W.S. Elev Vel Head Frctn Loss C 6 E Loss Q Left Q Channel Q Right Top Width (ft) (ft) (ft) (ft) (ft) (cfs) (cfs) (cfs) (ft) 1 10 PF 1 4972.98 4972.84 0.13 0.38 23.72 31.69 1 20 PF 1 4973.81 4973.71 0.10 0.83 0.00 19.86 4.24 40.50 1 30 - PF 1 4974.85 4974.74 0.11 0.74 0.00 1.16 22.94 38.55 1 40 PF 1 4976.04 4975.91 0.13 0.88 0.00 1.67 22.43 34.34 0 0 F t ATTACHMENT 3.4 Proposed Condition HEC-RAS Modeling Output — Firehouse Alley ' FORT COLLINS HOTEL FIREHOUSE ALLEY HYDRAULICS; PROPOSED CONDITION MODEL ' NORTHERN ENGINEERING; JUNE 15, 2015 Page 1 of 5 ' HEC-RAS Version 4.1.0 Jan 2010 U.S. Army Corps of Engineers ' Hydrologic Engineering Center 609 Second Street Davis, California X X XXXXXX XXXX XXXX XX XXXX 1 X X X X X X X X X X X X X X X X X X X XXXXXXX XXXX X XXX XXXX XXXXXX XXXX ' X X X X X X X X X X X X X X X X X X X X X XXXXXX XXXX X X X X XXXXX 1 PROJECT DATA Project Title: Alley - 100yr-Proposed Project File : Alley NE.prj Run Date and Time: 6/29/2015 1:32:05 PM Project in English units PLAN DATA Plan Title: Plan 01 Plan File : d:\Projects\947-002\Drainage\Modeling\HEC-RAS\HEC-RAS-Proposed Cond-2015-06- 02\Alley_NE.p01 Geometry Title: Alley Geometry File : d:\Projects\947-002\Drainage\Modeling\HEC-RAS\HEC-RAS-Proposed Cond- 2015-06-02\Alley_NE.g02 Flow Title ' Flow File 2015-06-02\Alley NE.f01 Plan Summary Information: : Alley-100yr : d:\Projects\947-002\Drainage\Modeling\HEC-RAS\HEC-RAS-Proposed Cond- Number of: Cross Sections = 3 Multiple Openings = 0 Culverts = 0 Inline Structures = 0 Bridges = 0 Lateral Structures = 0 Computational Information Water surface calculation tolerance = 0.01 Critical depth calculation tolerance = 0.01 Maximum number of iterations = 20 Maximum difference tolerance = 0.3 Flow tolerance factor = 0.001 Computation Options Critical depth computed only where necessary Conveyance Calculation Method: At breaks in n values only Friction Slope Method: Average Conveyance Computational Flow Regime: Subcritical Flow FLOW DATA Flow Title: Alley-100yr I 1 1 C FORT COLLINS HOTEL FIREHOUSE ALLEY HYDRAULICS; PROPOSED CONDITION MODEL NORTHERN ENGINEERING; JUNE 1S, 2015 Page 2 of 5 Flow File : d:\Projects\947-002\Drainage\Modeling\HEC-RAS\HEC-RAS-Proposed Cond-2015-06- 02\Alley_NE.f01 Flow Data.(cfs) River Reach RS PF 1 Alley '1 30 9.5 Boundary Conditions River Reach Profile Upstream Downstream Alley 1 PF 1 Known WS = 4975.26 GEOMETRY DATA Geometry Title: Alley Geometry File : d:\Projects\947-002\Drainage\Modeling\HEC-RAS\HEC-RAS-Proposed Cond-2015-06- 02\Alley_NE.g02 CROSS SECTION RIVER: Alley REACH: 1 RS: 30 INPUT Description: Station Elevation Data num= 19 Sta Elev Sta Elev Sta Elev .9 4988 1 4977.85 4.51 4977.83 11 4978 12.87 4978.07 16.55 4978.11 • 20.89 4978.21 214978.214 28.89 4978.52 32.32 4978.59 33.42 4978.62 34.23 4978.6 Manning's n Values num= 3 Sta n Val Sta n Val Sta n Val .9 .016 1 .01.6 21 •.016 Bank Sta: Left Right Lengths: Left Channel 1 21 155 155 Blocked Obstructions num= 1 Sta L Sta R. Elev 21 41 4988 CROSS SECTION OUTPUT Profile @PF 1 Sta Elev Sta Elev 4.97 4977.89 9.26 4977.94 19.64 4978.23 19.69 4978.24 29.94 4978.55 31.47 4978.58 41 4978.68 Right Coeff Contr. Expan. 155 .1 .3 E.G. Elev (ft) 4978.29 Element Vel Head (ft) 0.10 Wt. n-Val. W.S. Elev (ft) - 4978.19 Reach Len. (ft) Crit W.S. (ft) 4978.19 Flow Area (sq ft) E.G. Slope (ft/ft) 0.006350 Area (sq ft) Q Total (cfs) 9.50 Flow (cfs) Top Width (ft) 17.58 Top Width (ft) Vel Total (ft/s) 2.60 Avg. Vel. (ft/s) Max Chl Dpth (ft) 0.36 Hydr. Depth (ft) Conv. Total (cfs) 119.2 Conv. (cfs) Length Wtd. (ft) 155.00 Wetted Per. (ft) Min Ch El (ft) 4977.83 Shear (lb/sq ft) Alpha 1.00 Stream Power (lb/ft s) Frctn Loss (ft) 1.00 Cum Volume (acre-ft) Left OB Channel Right OB 0.000 0.016 155.00 155.00 155.00 0.00 3.66 0.00 3.66 0.00 9.50 17.57 0.10 2.60 0.17 0.21 0.0 119.2 0.34 17.58 0.08 41.00 0.00 0.00 0.00 0.03 0.00 FORT COLLINS HOTEL FIREHOUSE ALLEY HYDRAULICS; PROPOSED CONDITION MODEL NORTHERN ENGINEERING; JUNE 15, 2015 Page 3 of 5 C 6 E Loss (ft) 0.00 Cum SA (acres) 0.11 Warning: The energy equation could not be balanced within the specified number of iterations. The program used critical depth for the water surface and continued on with the calculations. Warning: The energy loss was greater than 1.0 ft (0.3 m). between the current and previous cross section. This may indicate the need for additional cross sections. Warning: During the standard step iterations, when the assumed water surface was set equal to critical depth, the calculated water surface came back below critical depth. This indicates that there is not a valid subcritical answer. The program defaulted to critical depth. CROSS SECTION ' RIVER: Alley REACH: 1 RS: 20 INPUT Description: Station Elevation Data num= 19 Sta Elev Sta Elev Sta Elev Sta Elev Sta Elev 0 4975.67 3.99 4975.59 10.37 4975.51 16.01 4975.49 16.04 4975.49 204975.468 26.87 4975.43 26.98 4975.49 30 4975.49 31.13 4975.5 ' 32.27 4975.52 32.91 4975.5 34.63 4975.5 404975.547 40.28 4975.55 40.72 4975.5 51.87 4975.73 54.86 4975.84 60 4975.82 Manning's n Values num= 3 ' Sta n Val Sta n Val Sta n Val 0 .016 20 .016 40 .016 Bank Sta: Left Right Lengths: Left Channel Right Coeff Contr. Expan. 20 40 92 92 92 ..1 .3 ' Blocked Obstructions num= 2 Sta L Sta R Elev Sta L Sta R .Elev 0 20 4985 40 60 4985 CROSS SECTION OUTPUT Profile @PF 1 " E.G. Elev (ft) 4975.78 Element Left OB Channel Vel Head (ft) 0.10 Wt. n-Val. 0.016 W.S. Elev (ft) 4975.68 Reach Len. (ft) 92.00 92.00 ' Crit W.S. (ft) 4975.68 Flow Area (sq ft) 3.83 E.G. Slope (ft/ft) 0.006617 Area (sq ft) 3.83 Q Total (cfs) 9.50 Flow (cfs) 9.50 Top Width (ft) 20.00 Top Width (ft) 20.00 ' Vel Total (ft/s) 2.48 Avg. Vel. (ft/s) 2.48 Max Chl Dpth (ft) 0.25 Hydr. Depth (ft) 0.19 Conv. Total (cfs) 116.8 Conv. (cfs) 116.8 Length Wtd. (ft) 92.00 Wetted Per. (ft) 20.36 Min Ch E1 (ft) 4975.43 Shear (lb/sq ft) 0.08 Alpha 1.00 Stream Power (lb/ft s) 60.00 0.00 Frctn Loss (ft) 0.06 Cum Volume (acre-ft) 0.02 C 6 E Loss (ft) 0.02 Cum SA (acres) 0.04 Right OB 92.00 0.00 0.00 Warning: The energy equation could not be balanced within the specified number of iterations. The program used critical depth " for the water surface and continued on with the calculations. Warning: The conveyance ratio (upstream conveyance divided by downstream conveyance) is less than 0.7 or greater than 1.4. This may indicate the need for additional cross sections. Warning: During the standard step iterations, when the assumed water surface was set equal to critical depth, the calculated water 1 kII t I 0 11 FORT COLLINS HOTEL FIREHOUSE ALLEY HYDRAULICS; PROPOSED CONDITION MODEL NORTHERN ENGINEERING; JUNE 15, 2015 Page 4 of 5 surface came back below critical depth. This indicates that there is not a valid subcritical answer. The program defaulted to critical depth. CROSS SECTION - RIVER: Alley REACH: 1 RS: 10 INPUT Description: Station Elevation Data num= 14 Sta Elev Sta Elev Sta Elev Sta Elev Sta Elev 0 4974.89 5.32 4974.82 10.5 4974.79 11.24 4974.78 12.94 4974.72 204974.693 23.41 4974.68 26.3 4974.69 30 4974.73 30.06 4974.73 34.01 4974.76 38.97 4974.78. 40 4974.83 40.1 4984 Manning's n Values num= 3 Sta n Val Sta n Val Sta n Val 0 ..016 20 .016 40 .016 Bank Sta: Left Right Coeff Contr. Expan. 20 40 .1 .3 Blocked Obstructions num= 1 Sta L Sta R Elev 0 20 4984 CROSS SECTION OUTPUT Profile 8PF 1 E.G. Elev (ft) 4975.21 Element Left OB Channel Right OB Vel Head (ft) 0.01 Wt. n-Val. 0.016 0.000 W.S. Elev (ft) 4975.26 Reach Len. (ft) Crit W.S. (ft) 4974.92 Flow Area (sq ft) 10.61 0.00 E.G. Slope (ft/ft) 0.000224 Area (sq ft) 10.61 0.00 Q Total (cfs) 9.50 Flow (cfs) 9.50 0.00 Top Width (ft) 20.00 Top Width (ft) 20.00 Vel Total (ft/s) 0.89 Avg. Vel. (ft/s) 0.90 0.02 Max Chl Dpth (ft) 0.58 Hydr. Depth (ft) 0.53 0.21 Conv. Total (cfs) 634.2 Conv. (cfs) 634.2 0.0 Length Wtd. (ft) Wetted Per. (ft) 20.57 0.43 Min Ch E1 (ft) 4974.68 Shear (lb/sq ft) 0.01 Alpha 1.00 Stream Power (lb/ft s) 40.10 0.00 0.00 Frctn Loss (ft) Cum Volume (acre-ft) C & E Loss (ft) Cum SA (acres) SUMMARY OF MANNING'S N VALUES River:Alley Reach River Sta. nl 1 30 1 20 1 10 SUMMARY OF REACH LENGTHS River: Alley Reach River Sta. Left n2 n3 016 .016 .016 016 .016 .016 016 .016 .016 Channel Right [I FORT COLONS HOTEL FIREHOUSE ALLEY HYDRAULICS; PROPOSED CONDITION MODEL NORTHERN ENGINEERING; JUNE 15, 2015 Page 5 of 5 1 1 1 30 20 10 155 155 155 92 92 92 SUMMARY OF CONTRACTION AND EXPANSION COEFFICIENTS River: Alley Reach River Sta. Contr. Expan. 1 30 .1 .3 1 20 .1 .3 1 10 .1 .3 Profile Output Table - Standard Table 1 Reach River Sta Profile Q Total Min Ch E1 W.S. Elev Crit W.S. E.G. Elev E.G. Slope Vel Chnl Flow Area Top Width Froude # Chl (cfs) (ft) (ft) (ft) (ft) (ft/ft) (ft/s) (sq ft) (ft) 1 10 PF 1 9.50 4974.68 4975.26 4974.92 4.975.27 0.000224 0.90 10.62 20.00 0.22 1 20 PF 1 9.50 4975.43 4975.68 4975.68 4975.78 0.006617 2.48 3.83 20.00 1.00 1 30 PF 1 9.50 4977.83 4978.19 4978.19 4978.29 0.006350 2.60 3.66 17.58 1.00 Profile Output Table - Standard Table 2 Reach River Sta Profile E.G. Elev W.S. Elev Vel Head Frctn Loss C s E Loss Q Left Q Channel Q Right Top Width (ft) (ft) (ft) (ft) (ft) (cfs) (cfs) (cfs) (ft) 1 10 PF 1 4975.27 4975.26 0.01 9.50 0.00 20.00 1 20 PF 1 4975.78 4975.68 0.10 0.06 0.02 9.50 20.00 1 30 PF 1 4978.29 4978.14 0.10 1.00 0.00 0.00 9.50 17.58