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Home My WebLink About09/10/2018 00 Misc Distributed at the MeetingUpper Yakima CFHMP — 2018 Cowiche Addendum Joint Study Session 9-10-2018 10:30gm-11:30 ,im Session Objective What is a CFHMP? • State content guidelines, pre GMA, risk & solution orientated • Part of a larger communication process Distributed at the Meeting F;� 00t yam►( 6xai� • funding longterm- local consensus brings regional & federal funds February 2016 & March 2017 Flood Events Near-term Joint actions Summer/Fall of 2017 • City of Yakima, WSDOT, Yakima County Establishing actual risk & potential solutions Long-term actions proposed in CFHMP • Goals and objectives, Priorities, variety of stakeholder inputs • City of Yakima, WSDOT, Yakima County CFHMP Process- Steps Completed Establish Stakeholder & Public Input Process using State Guidelines (non-GMA) Establish Advisory Committee (Stakeholders) Establish Flood Risk & Urgency Set Goals and Objectives (Findings sensitive) Inventory Physical Conditions Establish Need for Flood Hazard Mgmt. Measures (History &Modeling) Identify Flood Issues (findings sensitive) Identify Alternative Flood Hazard Mgmt. Measures •Structural •Non -Structural Generate Recommendations by evaluating Alternative Measures, with respect to Goals and Objectives, costs, benefits, and impacts on flood issues Comprehensive Flood Hazard Management Plan (CFHMP) Process Establish Community Participation Establish CFHMP Advisory Committee Inventory Physical Conditions 8& I Public Workshops I Complete draft Dlan I Plan reviewed by local jurisdictions Local SEPA review & approval Submit final plan to local jurisdictions ' for public hearing & adoption Submit plan to Ecology Set Goals & Objectives n� Determine the need for WTI 1:7flood hazard management measures E Co U Z' Identify alternate flood hazard management 0 alternatives - structural & non-structural -o cReview concurrent FEMA restudy flood maps U Evaluate alternative measures with respect to goals & objectives, cost, benefits & impacts • • • • Develop a flood hazard management strategy I Complete draft Dlan I Plan reviewed by local jurisdictions Local SEPA review & approval Submit final plan to local jurisdictions ' for public hearing & adoption Submit plan to Ecology a�_srl.rgsevaaauppwwrram .�acAwr»._emaporvngl Z —y ... .....o omona Rd..E. mo n p n Z Z Firing Center Rd. at Naches _ Y f. f OMf s S' 4 Pb t it n cults � m % 1 ant Selah N d N Terra o f Is _ Roza H I Dr. L 1 0. ' 7C 0 SummiNlow -r _ ,. O . 7Won Or - 4 - \ 4f M�n Rd. F Z } akimal Nob HDI Wvd. W. `-•�^._. _-...�... 1 r 4 �. Mead A ..W. r' R 24 Weras br Rd , � � y Was'ton. . A _ �. Ahtar'WrIRd. -i on Gap r. ti postma rad Rd. Bcaud no Rd. Ahla m Rd. S. Figure 1 - 2. CFHMP Study Area Parcel la bws are tot visual display YAKIMA COUNTY only. lM not uae for MvW poses. GEOGRAI INFORMATION SERVI ---' Streams Citie�s'Io 013 as +2 ix 14 - streets Selah Q CFHMP Study Area Mb - k - Highways 0 Union Gap t :w, ep,ac t.) mba lCIT0a6 Yw.0 coag i0U7K " 6rs NORTH C Yakima n. -M nva�e.umoanm.:a ens 4.aa dour a�_srl.rgsevaaauppwwrram .�acAwr»._emaporvngl Z —y ... .....o February 15th 2016: —1200 cfs February 151h 2016: —1200 cfs Ul 4- U O O N r -I 2 l0 r -I O N t c -I L fu L LL 0 4 March 15, 2017 r c Lr s L R WE KAnrrh 1 E; 7n17 WE oFilk ti1 XR� 4 y �� t s't � � i� .�2'us 9z ,�Y � .c;, k �"° N4''"'.a 2, -' ,��. - t>�..'' �i t.Y � .��i-*e. a.�� a .. =4.'n�i �f ,=�Pyy �.. 1+ � A b, � '%s � ��. w a `F ' �a t. ,y. �" .s. ,�� x a -r .g� � �� f �y ��a, � . .,. a. �.. �. � a v. ;• aA w �. , F � r' � +r , s ' #..{� v S �? v ;'§�.. �� -.. � 8 '��"' �} 3 � .'� .. ,r y � � '��'�� , �. t ... , x, ',_ - �� .; ,> { �e;� k:� �� ER,� ��t .�G,. n , .. �'. �� ' ti5 <, ..i . _, �� i a q2 e , .. .. .,p .. . ,. '' .. ' : _ sa ,' .. Y .,> .ti � �_ v;+ .. � # Y: K u t � ' r, � t ,#� �, + �.. + - ,. � .,. u�� : �' � ,.. v .. y yF W. Yk � Q n � l . �' , $.. .% � z mm �. s. + ,. Wx�a �' y ,_ �g ,.. ._ �' a. u, t -. �. ., ' .. .. � �: .� 4 __ ;. N �,�, � .. � �, � x � x. � � ` .. � � �, t � �. « ; ,� .+ �. :_ m � � i a .. i � 10 9 8 7 ,t- 6 Cowiche Creek - March 2017 stage records 9 N 1 0 1 _ _.. _ 1 _..__ . 1 03/14/17 (12) 03/14/1.7 (16) 03/14/17 (20) 03/15/17 (0) 03/15/17 (4) 03/15/17 (8) 03/15/17 (12) 03/15/17 (16) 03/15/17 (20) 03/1.6/17 (0) 03/16/17 (4) 03/16/17 (8) 03/16/17 (12) 2016 events showed slightly shorter delay (4 to 5 hours) Upper Yakima CFHMP — 2018 Cowiche Addendum Joint Study Session 9-10-2018 • Actions taken prior to 2017/2018 flood season • City of Yakima, • Repair private levee, Flood Fight Agreement with WSDOT, flood fight agreement with landowner downstream • WSDOT, • Clean out bridge, Flood Fight Agreement with City • Yakima County • Replace confining trail bridge • Acquire easement for new channel downstream • Clean out under new trail bridge • Facilitate & provide Upper Yakima CFHMP update • Yakima Valley Office of Emergency Management engaged • Communication role ��7 -� 6 Yi v `is TS � •. '� a'r �'�ft�%;f�,tLY, 1 �..'"1 c µJ +' r f� I lQik ,,'� k = ''fit �•ae"w. r �tr F {,a.�+� 5, ' F i95, �fi � t •v i.�_r •r � 2 is � �� .y �• �l ,y YA � t �' Y •�T rt l l �+ . i' y ? i va i ., Q` � 1 NY � wbYYdsYYd 1l y r. Jlll l.Yll� l l Ill f .;, • �.i J lt�l 11YtA,ll , llldYl ,y� .i o ��7 -� 6 Yi v `is TS � •. '� a'r �'�ft�%;f�,tLY, 1 �..'"1 c µJ +' r f� I lQik ,,'� k = ''fit �•ae"w. r �tr F {,a.�+� 5, ' F i95, �fi � t •v i.�_r •r � 2 is � �� .y �• �p �x i b Sf r x � P• �t �5k Pr i y 1 a h y A a tt a SR -12 MIC ennergancy floodwate- routing Cu Nwhtr4 Rim) .�� ' jt1tl <, �1111�-"*Amnj-Rw RI -95 -IN -1 Llmmn��,- I Wator Recourccr Division ExhibtA Loc2ton Lk2p 2DI 5 Aerial Photo Coda:FC.-344 Map prepaed Bj:dhm N Map Prepared '-23-2018 CCB 2981A Fshlbtt A \YJAKI MAR, Rim I of I Feet .00UMry Upper Yakima CFHMP — 2018 Cowiche Addendum Joint Study Session 9-10-2018 • Actions taken prior to 2017/2018 flood season noted above plus • Involvement of Yakima Valley Office of Emergency Management • City of Yakima & WSDOT agreement at 4011 entrance ramp • County acquired easement for downstream channel 2015 • Partnership formed • City of Yakima, County ,FCZD, WSDOT, YVOEM, landowners 1 2017Event 8/172017 2) LowerCreekRe•Alignv1.0 2017Event 8/17/2017 Legend Ground Ground 0 Soo 1000 1500 2000 2500 3044 Main Channel Distance (A) 1284.98, 1173.87 Upper Yakima CFHMP — 2018 Cowiche Addendum Joint Study Session 9-10-2018 • CFHMP to determine cause & risk, generate solutions & basis for funding, then make recommendations • Public Process and Advisory Committee to maximize unified support • Advisory Committee 31 members, 11 meetings, 6 months • If vulnerable less than 10 -yr flood what about 100 -yr flood? INYakima County Flood Control Zone District Yakima County Flood Control Zone District ETil I Mid -Columbia Fisheries Enhancement Group Mid -Columbia Fisheries Enhancement Group Yakima County Engineer Y City of Yakima Public Works Yakima County Office of,Emergency, Managemek '" r juji sit 'Affiliation- Washington State Department of Transportation G� � • - ; WashmgtonState Departmentof Fisfi and Wildlrfe�'c � ,: . o • City of Yakima Water/Irrigation . . Cityof Yakinna Planning s i a Lake Aspen Homeowner's Association • ,Yakima ,County0f1 e6f,Emer9 encyManagement l i • _ - ' .' - "' Yakima County Flood Control Zone District `Private Landowner . ;; _ :- -�.:' •.: ,:..._ Private Landowner Crib Yakama Nation o Yakima County Planning Division � Gty:of Yakima Wastewater/Stormwater _ _ • Washington State Department of Transportation • !;City; of YakimaChief,Ingmeer '. Mid -Columbia Fisheries Enhancement Group d b Yakima County Office of Emergency Management 'Yakima County Roads Mamtenance • • - i City of Yakima Community Development °Q Lake Aspen,Homeowrier n • Yakima County Environmental Services Director Washington Department of Ecology - -` Q�iC•Di Yakima County Planning Division Wash ington'State Department:of Fish andMildIIfe'. u • Yakima County Flood Control Zone District INYakima County Flood Control Zone District Yakima County Flood Control Zone District ETil I Mid -Columbia Fisheries Enhancement Group Mid -Columbia Fisheries Enhancement Group Yakima County Engineer Y City of Yakima Public Works Yakima County Office of,Emergency, Managemek '" r Upper Yakima CFHMP — 2018 Cowiche Addendum Joint Study Session 9-10-2018 • Establish Need • Did this happen before? 1933, 1948, 1974, 1995, 1996 • Severity? 1937 actions, Noted in Corps studies 1953, raising 1996 • Cause - Infrastructure Complications • 1906 & 1913 Railways deflecting Cowiche Creek off delta southward • Warehouses occupying floodplain - infilling • Channelization pre 1933 — levees from dug out material • Multiple private levees • Building of State Route 12 bridges and fill blocking Naches River • Creation of Myron, Willow & Aspen lakes • Urban development — increasing land pressure -----less open space • What is current risk? • How big were recent events? • What is capacity of Cowiche Creek? • Generate Flood Issues to move to solutions t-a .8 zr�� i`,+ s `!.�.. -s.T ;� ''.� ". „�.°y� - �,� rw, � cr >,� � r� '�7'i:.a`�`'t�- �.�•�-�„°''�_ 1 G* r w 4°r� r3'��. ,+, t ; :: > 1,�• �,b � .rq: �'' ��*,� .,� �'�t � � �+.r ;,: ;a: �� 1�4 F, `,:�sa� �`�� .,tl ,, &� v .j, 4 �/J + �, L�.�, .. -z '�•'t ... �. �*, r-3t"��. ... ; �`-.Y"�t�- .•: •" "##'"`�: • JFy- ai."` . �.. rw�r, M� { ,�sr,� z, �% -:. _� _ � J �. :: u"-Yj<��t"r ,, rX�' Y f�1 • �/'v;-.o � r �� .,s 7 � r, -�' �d e ,s� z`Y,.� r -� i� {`,�� r+a' �(� �'"'z' c -� � 3' � ^�„ y .:L�`{r t': __-,43 r • ,;.� -.;:" _-..*.� # x ltAh'1 �. q ,, w ..1`��si G. t#f, .r�r 'iw i`[l'Ei. �, c� ",:!t -`4 �`•.. `k�•✓\, ,'� ! .,{�.�.. ,j rk fir. r r.. 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'#6«F� :` e . r 1996 Cowiche Creek - Spring 2017 vs Spring 2016 1400 Measured Discharge a I 1200 Estimated Discharge It; — — — 2016 Event tr i — t +1 t b 1000 i I I t 800 i t w t I V r 3 t s 0 U- / { 600 ! i I t e r � r 1� 400 t �� 200 0 3/8/17 3/10/17 3/12/17 3/14/17 3/16/17 3/18/17 3/20/17 3/22/17 3/24/17 3/26/17 3/28/17 Date Floodili2 Source and Location Cowiche Creek At mouth North Fork Cowiche Creek At mouth Above confluence with Tributary 1 Above confluence with Tributary 2 South Fork Cowiche Creek At month West Consultants, 2011 Drainage Peak Discharges (Cubic Feet per Second) Area 11187 1,661 23.5 (Square 10- 4- 2- 1- 0.2 - Miles) Percent- Percent- Percent- Percent- Percent- 577 Alllltlal- Amival- Annual- Aiuival- AIuival- 1,014 Chance Chance Chalice Chance Chance 119.5 1,519 201 21,396 2,818 3,903 38.8 627 833 1,003 11187 1,661 23.5 422 564 680 807 1,135 19.0 357 478 577 685 965 71.5 1,014 1,341 1,610 1,899 2,643 pt I 411 4 , �� s�S �' � °; %4- �,f .� '�. A` sem{ � a '�jN�a•. afy�ye, 4, `w - ti t+ Y_i Y ,. L West Consultants, 2011 't a` - - `k 7P7. xv w. '� Jj��i'ri4� ;- 1. ��• t ' • �C,i1"•h 'qty. . - -Y'a 'K'' J, s - L . _.. .,10A„n.. • _ _ FEAfA Region X �� ^ ' EaeMe HODO Zmes (c \�' YAKIMA COUNTY, WA Flood Hazard Study> A New Draft FbOo Zones �Il %" , , Draft Workma eff r Zone AE Cross Ser,.am Page 23 (23 of 24) 7— A r— .;n^evm �UM� A9ay- 17 e .G 44i F ,+. a a F -sr -°+.3�av *; �r p r 1 �.. Y� } :. Neches River ,w; -=�•, ism.K Tye a't e_ �� 4-'yj�'`s sj tju� t�' �.-fix r s �• — ,` o •^ *- " b ' - -,r �„ ` 4 .x a `, mak, t .. x ° `{r.. h '_5', r "t °` ` ,'`4 n�20lnv.AC•�;. dGt Water Resources Division 14 T°k r) '`:. .1'+� 'C q... d ��yt,a. ,i �� i :L�r....�,.. b rnt#,•. r:'r4Y: ��t �!'�;. ,�:^ �°�s>•+,� �l/� ;�.` t \J aR�v^ Project Title: 3 R off` Hghway 12 fridge sr t } �i•+' /7�Q ' i x`l. Y'x SJi� i i` Flood risk reduction measures Evimaled Currant Capacity (without dem,s wm) i :,¢ ' r } r �;- - yt'� p x 'i,. for Cowiche Creek 600cfs-SOO cis (upon channel flmv(in-90d5mn 003) T �.�Y.E +shy♦ j M y �„ 1,000 Cts 1 700 c(s (submergedrile, psueam water level Figure Title' ,ea ng luv of conn a,e at G,y Reseno r) 9 Y - Estimated existing conveyance ` r `. .,i capacities (.evred) t } 3 ,.•s+k°"'d =`� wdh dredga -1 000 ,is channel) * Q , 1 £ �' . _r o� -1.500 cis (submerged info,. upstream water ler el / fy \ Ar.. nearing tpiono 1,al CiResrc educ�b tJ' Code: FC3644 dl,kah oofdebrsymduring II od k r3 s' '" �K.!'Y�" t,v •�_ �, - --• v. ,'( -i'r1� 4 y ` 'r 1 �r# Map Prepared by: dhm "• ,tx '.5 i / k ,s EsumatadG:;7;.rapacky:'' Date Prepared: 9/13/2017 "a•:' i i "; y.*.,, 4' -500 open channel rlo + • rf `j .:: rests replacedwth elev Raltated,rad bid a. \' �� • p,..`I" g 8 v A fiy T waerle el op o1f �} , Likely above 1 in 100 AEPflowl els �ti. � -. x .-.:•c `�i..A..3 z '. v - YA .5 a__ mai ^, �„[ t 23 5, -y, r �.. V ov `- � yq { !. F Co fiche Creek Channel below Hwy 12Tra,1 k n T Y C "d` �1 �ct\�F dr .. _,EimatedC rent Capacny d00 to 500 cis flow out onto floodplain)t` Powerhouse Rd Bridge y'ix`° '�" n' 1 > "" •�;4 "•' �' s>,y • "� a Est ,h.Cor n nit Capacity: -7,500 ds (Abo a 1.500 cls and flow will back up c �' x #'$ * a dcrossRoll Powerl:i Rd)sr .'�' r x.. .T' �.+'..� '�'.b.-!:j54=;. � 's1' Hgh ay 12 `•1,. °iy *r �,:2"ryW.,,�,y ^ f - 44 Cowiche Creek Channel \ nit"."'" t #... t Estimated Current Capacity. -7,000 cfs '•'E 4. '�4 �;� 'r � � r �:,� .. x �F.� ,c � ..'+,({.. ,. o . (Feb 2016rMarch 2017 event was about 1,200 cis) Lenend 000 ds and berm will likely Dreach due to 4t.V�,, 1 x '*cal+•- t ti� Q•.� .;` a s i .a a, "{ y,, •\ afi ,,;, _ City Limits A e 1 ,' �• \ 7 3 . *S'u 4 , "v+# ,".S 'r gra.! d`—...YaCy :.riGa `i'S+&... 4�'".t �„r+e c s . - rs �� cl" t�"� ;. �"yy s •�• :a" i., sA+acu•ar ta. it\a4 .+cks ei+r a y •.\'�,. '�* i•3 z`` 7, \ 5.c� 1`."7 vrurxp °•r st;r ~,a� s-c�'ra+r : -s. s �r''r b- "�:�,�4 \ •v: s� _ � r :v - R ..�..s� �,�"�y- ,, a�. .;,*fps �p,+� � .iTi.i �.`ia i i �, o ..•o �,�� Hydrology t 1 % AE P (100 -yr) - Q =2,818 c is s 2%AEP(50-yr)-0=2,396cis a �/�'� r .. A ..:• *` "^. i•"" ^'fxL* : f 1�.. "r' . , r, + f " xc-.a,wraart t • 3 '. 4% AEP o � syi„•*.i,rii. 7'r�`< rt_,.,h+rt 5 .' .t � 1 '7v \'�P ersh. aouse Rd ,k ,,v ;*ti_i« � , --•-• W.°.t .} L `r''ax;.q, tn`z:t'611� .4as'n,77.��"t.tRT'*"r,°+ •�.^raa�^ dr� • -s s.c,„�3.i' ��°a 25-) - Q=2,001 cis iphonpipe above 1% AE 10% AEP(10-vi> - 0=1s19 cis a,t v$. � 2015 Aerial Photo € s., t .tet '`vhk ,�.aci ttty. : r ti f•Fgt"et'L++'°.�.v>it"rda. ^cf�I' n� "�f'�-?fi i+3 'ic As' X14c / ,a. `" •t;c. ' :•Obi y. s� �r�'C 4 sit 3 r « :�• �litcf. ,,�'T'�^ h \ i'< •: n�v a_ i-�•r v„#• 1 t�. Y�a.#�t inch 160 foe, J Feet a� *'fir tbir \ - !x 7vb b L 1+'t ~t�. j ^•.'T.(1, `.{�{�;�T a 0 150 300 • � 4 (r T A ZVI", -- 7.-- " I TABLE 6-1 FLOOD ISSUES TABLE 2018 ADVISORY COMMITTEE RANKING OF FLOODING ISSUES ID Flooding Issue waw LC1 INAD EQUATE"FACILITIESIN'FLOODPLAI N; -AND HYDRAULIC,CAP,ACITYOF10WERCOWICHE_CREEK TO PREVENT.FLOIODOVERFLOWSCI ' LC2 FLOODBLAIN AND FLOOD RISK MAPPING -NOT REFLECTIVE OF RISK ] Lc3 IMPROVE PUBLICAWARENESS'AND'FLOOD;INSURANCEKNOWLEDGE ' LC4 IMPROVE FORMAL INTERAGENCYCOORDINATION 2 LCs REVISION AND,CONSISTENCY OF FL 070b HAZARD;.CRITICALAREAS & SHORELINE ORDINANCES FOR THISLOCATION 3 LCIS INADEQUATE FLOOD FORECASTING'SYSTEM —3 . Lo DEFINE CLEAR ACTION POINTSTO, INITIATE EMERGENCY RESP0 SE ACTIVIT�IES FOR£OWICHE CREEK OVERFLOWS 3 LCgFUNDI FOR FLOOD CONTROL WORKS ANDRESTORATION'PROJECT.ELEMENTS! 3 LCs EXTENSIVE FLOOD ROUTING IN(AND OUTSIDE OF.) THE CITY OF YAKIMA 4 ao STABILITY OF BERMS ON LAKE ASPEN/N1YR0 WILLOW"& ASPE DFDRAI G LC11 RISK TO US 12 DURING MAJOR FLOOD EVENTS 5 LC12 THREAT OF FLOODING TO STATE, COUNTY, AND CITY ROADS 5 LC13 LACK OF SPACE FOR COWICHE CREEK CHANNEL MIGRATION 6 Lc14 AVAILABILITY OF CENTRALIZED GIS DATA & MODELING IMPACTS IN PLANNING AND INVENTORY Lc15 OWNERSHIP AND STANDARDS FOR NEW/UPGRADED FLOOD CONTROL FACILITIES 6 LC16 DEVELOPMENT PRESSURES IN AFFECTED AREAS PROMOTING ADDITIONAL HARM 6 LC17 LACK OF SPACE FOR COWICHE CREEK LOW FLOW CHANNEL MIGRATION —7 LC18 OPERATION AND MAINTENANCE OF FLOOD CONTROL FACILITIES LC19 ACQUISITION/PRESERVATION OF FLOODPLAIN OPEN SPACE a LC20 LOSS OF CHANNEL CAPACITY DUE TO SEDIMENT ACCUMULATION AND LATERAL CONFINEMENT 9 LC21 SEDIMENT ACCUMULATES IN REACH, REDUCING FLOOD CAPACITY ' LC22 NELSON DAM AND FRUITVALE INFRASTRUCTURE REDUCING HYDRAULIC CAPACITY DOWNSTREAM OF US 12 LC23 EROSION/LOSS OF AGRICULTURAL LAND Upper Yakima CFHMP — 2018 Cowiche Addendum Joint Study Session 9-10-2018 10:30pm-11:30 pm • Session Objective • What is a CFHMP? • State content guidelines, pre GMA, risk & solution orientated • Part of a larger communication process • funding long term- local consensus brings regional & federal funds • February 2016 & March 2017 Flood Events • Near-term Joint actions Summer/Fall of 2017 • City of Yakima, WSDOT, Yakima County • Establishing actual risk &potential solutions • Long-term actions proposed in CFHMP • Goals and objectives, Priorities, variety of stakeholder inputs • City of Yakima, WSDOT, Yakima County Upper Yakima CFHMP — 2018 Cowiche Addendum Joint Study Session 9-10-2018 • Actions already taken prior to 2017/2018 flood season (not part of CFHMP) • City of Yakima, WSDOT, Yakima County • CFHMP Long Term Recommendations 10 to 15 years (dependent on funding) • CFHMP Short Term Recommendations are Interim Actions as long term implemented • Both Long & Short Term Recommendations generated in response to AC Flood Issues, and divided into Categories (each listed by priority considering Flood Issues) : • Planning (Short Term), • Flood Preparedness (Short Term), • Public Awareness (Short Term) and, • Structural (Long term)