AD-AI00 854 CORPS OF ENGINEERS BUFFALO N Y BUFFALO DISTRICT F/6 8/8AAlo 5 FLOOD PLAIN INFORMATION. OTTAWA RIVER-TENMILE CREEK. SYLVANIA A--ETC(U)

UNCLASSIFIED NL

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FLOOD PLA INFORMATION&,z

OTTAWA RIVER-TENMILE CREEK0 SYLVANIA AND VICINITY

LUCAS COUNTY, OHIO

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.- ~PREPARED FOR" ,*/OHIO DEPARTMENT OF NATURAL RESOURCES ,

0 IVISION OF PLANNING,FLOOD PLAIN MANAGEMENT SECTIOI ,,

Z " I.L_ AND. TOLEDO METROPOLITAN AREA COUNCIL OF GOVERNMENTS

i TOLEDO-LUCAS COUNTY PLAN COMMISSIONS

• I €,MAUMEE WATERSHED CONSERVANCY DISTRICTo s'YLVANIA MUNICIPAL PLANNING COMMISSION /CORPS OF ENGINEERS U. S. ARMY

, -DETROIT -DISTRICT

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SECURITY CLASSIFICATION OF THIS PAGE (WMhot!t Sr-'eretfo

REPORT DOCUMENTATION PAGE BEFORE COMPLETING FORM

1. REPORT NUMBER 12. GOVT ACCESSION NO. 3. RECIPIENT'S CATALOG NUMBER

4. TITLE (and Subtitle) 5. TYPE OF REPORT & PERIOD COVERED

(" Flood Plain Information.,Ottawa River-Tenmile FinalCreek

F - na

/ Sylvania and Vicinity Lucas County, Ohio, 6. PERFORMING ORG. REPORT NUMBER

7. AUTHOR(*) 8. CONTRACT OR GRANT NUMBER(e)

9. PERFORMING ORGANIZATION NAME AND ADDRESS 10. PROGRAM ELEMENT. PROJECT, TASK

U.S. Army Engineer District, Buffalo AREA & WORK UNIT NUMBERS

1776 Niagara Street I/Buffalo, New York 14207 _

11. CONTROLLING OFFICE NAME AND ADDRESS 12. REPORT DATEU.S. Army Engineer Distrcit, Buffalo 19751776 Niagara Street 13. NUMBER OFPAGES

Buffalo, New York 14207 2514. MONITORING AGENCY NAME & ADDRESS(I, different from Controlling Office) IS. SECURITY CLASS. (of thia report)

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IS. DECLASSI FICATION/ DOWNGRADINGSCHEDULE

16. DISTRIBUTION STATEMENT (of this Report)

Distribution Unlimited

17. DISTRIBUTION STATEMENT (of the abstract entered In Block 20, If different from Report)

IS. SUPPLEMENTARY NOTES

19. KEY WCRDS (Continue on reverse side it neceeary, and Identify by block number)

FloodsFloodingOttawa River

20 ABSTRACT (Co.two m reverse obfIf necweary ed idenlfy by block number)

-A knowledge of flood potential ad its hazards is an essential ingredient oftcomprehensive land use planning and management decisions concerning floodplain utilization. The information containedherein-will not only assist localauthorities and residents to better understand the causes of their flood probl( s,but will also provide necessary guidance in determining the best use of floodprone lands along Ottawa River and Tenmile Creek. This report is based onhydrological facts, historic data, and other technical informaion having a bea ing

D ? 14n EDITION OF I NOV 6S IS OBSOLETE

SECURITY CLASSIFICATION OF THIS PAGE (Wlhn Dot; Entered)

SECURITY CLASSIFICATION OF THIS PAGE(fht Data.t) ,

on the occurrence and magnitude of flood discharges within the study area.

Included are maps, profiles, photographs, and cross sections which indicate the

extent of flooding that might occur in the future.

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II

SECURITY CLASSIFICATION OF THIS PAGE147,n fara FEntered)

CONTENTS

Page

PREFACE

BA(KGROUNI) INFORMATION

Settlement I

The Stream and Its Valley)evelopments in the Flood Plain

FLOOI) SITUATIONData Sources and RecordsFlood Season and Flood Characteristics I

Factors Affecting Flooding and Its Impact I

Obstructions to flood flows I

Flood damage prevention measuresFlood warning and forecasting services 94

PAST FLOOI)S I0

Flood Records 14)

Flood )escriptions lW,

FUTURE FI)OI)S 13

5)-Year Frequency Flood C -. 18Intermediate Regional Flood F. , /.1 I::

Standard Project Flood 13

Hazards of Large Floods I" ,

Flooded areas and flood damages , " 15

Obstructions 15

Velocities of flow 15

Photographs of design flood heights 15

(;I)SSARY 244

AUTHORITY ANI) A('KNOWLEI)(EMENTS 21

,,_V

CONTENTS (Continued)

TABLES

Table Page

I Drainage Areas in the Otawa River Watershed 1

2 High Water Marks 12

3 Peak Flows 14

4 Elevation Data (Bridges Across Otawa River and Tenmile Creekin Sylvania and Vicnity, Lucas County, Ohio) 16

PLATES

Plate

1 Ottawa River Basin Follows Page i

2 Index Map - Flooded Areas At end of report

3-8 Flooded Areas At end of report

9-10 Flood Profiles At end of report

11-12 Cross Sections At end of report

FIGURES

Figure Page

1 Ottawa River Bridges 5

2 Tenmile Creek Bridges 6

3 Flood Scenes in Sylvania Township, July 15. 1958 11

4 Flood Heights along Ottawa River 17

5 Flood Heights along Tenmile Creek

('over photo - July 15, 1958 flood in Sylvania Township, west of Herr Road.

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PR E FA CEF

I h c s t ud(I reche o ,iiIt the Ot ta %%a R ise cr atn d I eu c n i ic k I i o id plIa ins ens: erd c i ii eport extenid 14 0l1) miles, upstream from the Interstate 475 Ihielishi asbidge o~ er Or tca <0e

ito thle cast \ illageC Ijink of lBerkcv on I cnmile Creek (Plates I and 2).1 It ncludes 2 7.4 indeI enmilc ('reek throuph Richfield Ilownrship. 6.04 through Ss Is ina Im~s~nship. rid _'INthrough thle (itv ol Ss Isania to it - confluence wirth North liranch Icenmilt: (rek I rmrn imh

point. ()ttass a H ver flows I1.32 miles through the ('its of S'sIsama and I .X1 r Ii oir ghs II 05%nship to the lolmer limit of the study area. T1he drainage area rrihntaro, to thl. Ortaoa Pat the Interstate 4_5 highwao bridge is 125.37 square iles.

A knomledgco oflood potential and its ha/ards isan essential ingredient ohcomprchensisLland use planning and management decisions concerning flood Plain Utrll/atiorr. I hleinilormiation contained herein will not only assist local authorities and residents to better

Understand the causes of their flood problems. but will also pros ide necessary guida ne indetermining the best use of flood prone lands along Ottawas~ River and I einmile (reek,. I liereport loenses attention on these flood prone landsatid flie ir enirorimientaI quailities, anid t her

)salue as a natural resource.

The puirposec uilthis stud', is to collect and develop intormat ion on past atnd proba bleltintrfloods. It w~ill not onl v assist local authorities wvith future stutdies. planniiing,. nd actioti designedtto eliminate or reduce flood ha/ards, hut will also help to a'o oid Ifuture damages likel it) he

associated wsith deveclopment in hlood plain areais. With it. development in flood prone areas earlhe planned at clesations highcenough to a.olid flood dlamages or at least V, ith I till reCCOLnitior it

thle chance or hai/ards of' flooding that exist.

[hlis report is, based on hydrological facts. historic flood data. and ot her tee ilitid

information haimiig a bearing on the occurretreand triagniturde oh flood discharges woit i 11iCh

stud 'o area. Included are maps, prof'iles. photographs, and cross sections sMlieh indicate thleextent of flooding that might occuir inl thetIut nrc. Properly used, this i nhormnation w~ill suipp it

sudflood plain management. Ih maps. profiles. and cross sections, indicate thle depth oii

prohabhle flooding at a ny location b\ the occurrence (A the 50 .\ear. I nterniedia te Regrional

10011 year). or Sta ndard Project F~lood.

Alternati e solttions to fhood probletisare not included. I oses c. the report pr11 iies tilebasis for f urt her studs and planning onl the part oh local governinents ti arrise ;t solkitirrns

w~hich will mninii/e future flood damages. [ his can he accomplished h\ Iocal pta rinirig

programs wshich guide dev elopmient and land use in the flood plain through /oing. building

codes, health regulations. atnd other reguilat or\. methods. Pamnplelts and guides, perirl. 1iiti1

flood plain regulations. flood proofing, and other relatted ac~tions basc ee.n piepa red h thie

Corps oif Frngineers. Ihcvl are available to state agencies. local giiscrnmntts. atid erti/ells orplanning atid action to redtuce flood damage potential.

[his report wAas prepared or the i oledur Metrpolitarn Atrea (o oincil of Guierlnuii heII ldil I.Utias (iountv Plan Commnissionstile MameWtrhd(osr re istrict.itid

the S ylsania Municipal Plannitng Coirniisioti. Coordination w~as elfected thrirtigh t ie I-hoo~d

Plain Manatgemernt Sectioin iof tile lDis sioti ofi Plannring, Ohio IDepartmient (it \at iii~j

Resources,. Copies oii tile reporrt "~ill be tiade asailable to interested a ' cricie, and ith iili;ilsthroiuigh these rgmtni/ations. I hie D~etroit Dkitrict. Corpis Ai I rigineers. arid the I loud P'laini

Mariagenent Sction (it the IDriiiut iid Planning. Ohior Icparrnierrt ill \atiral Ucsiiocs % iassist plannitng agencies intile interpretation arnd u1se of thle data presenteCd. is 5\'el i11 111Cdeoselopment ofi additional technticail inforrmration

BACKGROUND INFORMATION

Settlement

The first settlers arrived in 1832. locating on the north hank of ihe Ottawa River. noxs th,Cit of Syvania I[he village plat of Whiteford was filed ,lul I1.1 X35. and that of the Village ,,tSyhania the Iolloing year. In 1966. the two %illages were (onsolidated and incorporated. In11)Il. the Nillage poplilatiof was ahout 1.000 and had grown fo 5.200 in I960. at which timeSlvania sas proclaimed a city. As of the last census, the population had more than doubled to12.000. I hat portion ol Syl ania [ownship outside of the cit\ hs also exhibited considerablegrowth \%ith the popiula ti, increasing from 2.00( , I '.11(00 betvecr 1920 and 1970.

Ihe first settlers arrived in Richfield Township Ma\ I 14. locating near the southeastcorner of the to%%nship I ichfield is primarily an auricilt ural townshin and, as such. h;,, iotgro\ n as rapid\ as S vhania. In 1920. thetownship popuilation was I .OOOand by 1970 h:id onl\increased by 500. Consistent with historical precedent. both communities located on the besta.ailable communicatium network of that day - a stream cpahle ,t commercial transport I his\as done without regard lor the potential flood prohl.rns of toduv,

The Stream and It% V'alleN

[he Ottawa Rieur and its tributaries drain an area oi ahouit 1-2 square miles of ,hichabout 125 are tributary to the downstream limit of the stth area ;is shown in lable I.

TALR.E I

DRAINAGE AREAS IN THE OTTAWA RIVER WATERSHED

River Mile. )rainageabove mouth Area.

Stream Location of Ottawa River sq. mi.

Oltawa Ricr At Mouth 0.0 172,Otta\a Ri\cr At toledo I1.65 IS0,

)ttasAa River Below Schlicker Ditch 16.4 126.64.chlicker Ditch At Mouth .9t,()ttawa Ri,er Above Schlicker Ditch 16.4 125.74Oitawa Riser At Downstream Study Limit 16.91 125.37Ottawa Riser Belo% Harroun Ditch 177 122.59tlarrotun Ditch At Mouth .IXOttaa Riser Above Harroun Ditch 17.7 122.41Ottawa River At Confluence of

1 enmile ('reek and

North Branch Tenmile ('reek 19.95 120'

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TABLE I (Continued)

River Mile, Drainageabove mouth Area,

Stream Location of Ottawa River sq. mi.

North Branch of At Confluence "ithl enmile ('reek lenmile Creek 19.95 39.3'

I cnmitle Creek At Confluence with NorthBranch lenmile Creek 19.95 80.7

I cnitlc Creek Below Heath Ditch 20.24 80.43Hteatth )itch At Mouth 20.24 .81-I C1niiC C'reek Above Heath Ditch 20.24 79.62I entiilc ('reek Belo", Schreiber Ditch 21.98 76.25Schreiber )itch At Mouth 21.98 3.04Il ellitc (reek Above 'chreiber Ditch 21.98 73.211 crintrc (*reck Below Co'ntock and

Smith )itch 24.23 71.08(omtock and

Sinith I),tch At Mouth 24.23 4.04I ctn ile Creek Above Constock and

Smith Ditch 24.23 67.04Icinle ('reek Below Prairie Ditch 26.1 64.401

r,: I l:i)tch At Mouth 26.1 17.61C!.cek Above Prairie )itch 26.1 46.8'

I ennic ('Creek Below Smith Ditch 26.38 46.72Smih I),lch At Mouth 26.38 1.68I enmide ( icek Above Smith [)itch 26.38 45.04I cnmde Creck Below Butler Ditch 27.88 43.35131t.1 ' )ttLh At Mouth 27.88 1.99Sc:~i;ilc (rek Abo e Butler Ditch 27.88 41.36I cnmile ('reek Below Rohcrt.: !).rch 30.3 37.76Robert,, )itch At Mouth 30.3 1.85I crinle ( reek Above Robert, )itch 30.3 35.91I clotlle (reek At Vpstream Stud limit 30.9 35.55

I hc,,c ,reas are from 'Drainage Areais ol Ohio Streams, Supplement to Gazetteer of Ohio Streams"picparcd h. the 1! S. Geological Surve\ in cooperation with the Ohio Department of NaturalRcs.ui :c,. Ohio Water Plan Inventory. Report 12a, 1967. All other values weredetermined asa part ofthis Ilood plain information stud.

I ennrile ('reek Itom Itic upstreami studs\ lmit tori' . itL "I " lo ilg sotutheatI Cu"and then trorthe~ist III, , slani \%here Norrtht Branchi I C11ntile ( ILet k enIltS. I heir COlnuIcIerifrms the Ot.a Riser \0hiih tIlrsks in at sottitet1ri dirction o he ,o~ks isrearn lim 01 theLStudk areaI. RI he %)tu Psrratershcd is bounded h\ the PP' RHiisin basint the north ii

h\ thle \launme Riser b I it thre south.

I here I it d I1 ittlit cI IC,! 111, 2Cn1 t he IOp Ogah t T it ph101 LIisclIl the tippet 11imit1 (f 1iL' Ie1ti1\

areal. \t the 'Osser litit tiild Ilolihotit thle (mt of R55;I\C IItas R if \ ],I~ ij .i

delined salles %%hile the: upst earn portion ofi etrmie (ek lis o- through flat lands Mu ich aict\ pical I ot the lake pli ns o I lCCT tir cetrlI1 loi rl(dS pihN I I'd f)iphi pI o r 10 ICe. I hIII d It Ierenfce 11

illustrated bs\ the ey i' ''c inat thle end ol thle report.

Oser their totl-I In Hilt ohtil. O ttasit Riserand Iienitle ( reek rise trorn t lestioit ,I573 at thle rnitiut ofta~ Riser Ill \Orthl %Iaurttee Basto 11011 elesattir1 Of '7;8 at hesource i

lenilei (rek, lor an .ms erarc i~admerit of 4 teet per mile. Wtithrt the Ntud\ areat. hosseset. Htiser rises 87.3 teet 1t)ito Ill Celtiott ol 59447 tii 62,0 at the dosmvistretmn and tipsitearn stutd

unit11s. respciIse's tor ir aserage gradlient of 6.2 teet pet mile1 oser thle stid\ 11nt1 1 htuic 1'

distirnct chancLe Itl 'tre1 dttt 1eradmert niear riser infle 22 its shiis\ ri ontthe fl0id profILiles atCL~ th0n 1

the report. ( pstreamt Ot this point. the gradiern is 4.3 teet per nile. s ich is, apptovttrtatels I he

Name as the oserall L!!adicn1 lOossrstreart of riser miile 22. hosMCser. tire 12radient increase'h

9.*4 feet per nitte

[ic lteather abru!pt change itt stream gradients, us. significant xi uh respect iii stream)

elIociits. I he'secartl be so Increased as to eauISe forces great entIOtuh tostUhiect [irh;mnuI/ed areas

to tile Increased tian ' er of structurral as, %%ell as ordirars x %\tc datmage kkhere flOiss sIare

rImpedetd. purtietlilI at e\itin h - ridgzes, flooded uiutlrries arc slIOsl ti) Lin tt otit in at ratlici

dhramatic mrantner beCaiseI1 Of Obstructed florod ssarters.Hie arta lit timnIVLLttf~itiott I ld heerltmrL'd x itli an acctrumltin of ice oir debris at the bridgec upeniitiLs

IDeielopment in the Flood Plain

I blflooded are-as examined itt this repiort are shiosnr ott the sr\ sheets. Plates 3 t hrou ft01

I her ate titustl\ pasture. farmlnrd, andI %%nodef areas. siith onl\ a small amoi~untt oft industial.

cirrinme.rcial. arid residential deselopniterr. P'articularls Signrificantt IsN ties elouiment iii

highxmsi anid railroad sssterns titrinughorit this area. 0wsrail. 2' bridgesC Ctiiss rie 14 0111nil

reach of ()ttassa Riser and I eniile (reek covered hs. this repourt I Ire Oftet' iif these: britdges oniflootd ing is udescri bed it tire ne 51 part.

1.:11.00) Sill I I 1N

D~ata Source% and~( Reto rd.

\ LciiIhr . %%., IINst i on Mi at %\Is tticn c;iltcd I CIIniilC ( I-Ck J1til K t:) 1cci I ~it Hli~ '

I ilciti 1111t Xi i \%JriI thtsri ar rsac taiCc icc-dcjjLI %ki' iriial;icI itj li ti AC It .011

\lciurciicrtsIt I his slit \kcic itiscoiiieiid Amtc Sepici-Ici I Q)4.,s \CtiliI riiHTItIJ ci C'ii

lIiCJIsiirCdt, !1,11 cC Xi 11 is LciC lii flood, dt fili2 %\. I 9t4S ild l11r1c. I 94. \\cIt cip.ict!

iclist rcsIIIsI II cilirptetd iliarrrcs iiscd Ini til ctprrl I iC Icults C"ril rCA'Oruihlk

In 'idditioir to Ihcs c Tircarri L'aiin2 rc-ords. dritcs rid h1cirhiN ol mist Ilords %kerc pi milt (Ic

h\~ tice I ocis ( oirmt I linrcci . and pliritrmrriphs of a past1 Hood k\cic Pro\ idCd h\ ti RIc I liY

I oit It Ihp I 1i1't1cc I )Csci Ilm I i I)IIo1 l oods arc hascd on rcs-arc !IfA nc\ NIa per I Ile

BjsC ulijips piCp iicd Ior this report \kcrc Cnilarupcd from11 portiois ot I 'S. (icotof2ical C \

LiradA]Inrilc sh11cct clnItICI. 0111 Msna ho\ich_ .. Idtcd 190S anud 'kicr kc . )i( %litfh

datcd 1966 \k icic us\ irlalc. tso toot con~tour mapN oII tile ( its\ of 'N\ IsanIL \%Cie iiscd ;is a Ln'uldc

to pr os idc a mnoic dtIcHIiic dicliation ot Hlood limits. I hicsc: map, sscrc preparcd lin Miric.

197). ('11annctl cross, scct iors .111d hridC dalt Mete obalt)cd t101 hei ldi sirs\Css.

Hooucd Season ancd Flood Cha.racte~ristics

\ithin tific stlst area, Precipitation Is norm11alkls abundant and \ssCll dst1ributcd throughout11

tilc %car. Slbosscrs aMid 1ifirindcrstorrns account for most of tice raini-all dinri summerr Mtid

spmrig. I hunidcrstormsN occur on about 40) da\N s I cacti .saMost (it 55 fii occur dirrin21 t ! ic

rrviiinr ot \Pill thtroiugh Auguist. lDcpcriuhing ott thcir inrisits and diration. ttrcsc

tfii1icrstorINs nlas caIusc florodirig.

Altfritili 1rii0st pi .ccipitatiuri dfitrin tilc \%ittcr moinrthrs coIIics lin tilc IIrI of rali. Ilo\% till

as cralcs1 30) iricics aMid is distII-hitcsf tfrroighfiot tile niotitfis of Nrsrbrtirlougb \Iarctu

Ocrrcrals ttic crurcial flood pcriods, occur as a rcsirlt ot hica\\ ss ntcr anrd spring ranis coiiplcd]

Factoirs Affecting Flooding and It% Impact

Ohbtruction% to flood flow% - Naitural obstuctions ito Hoodf tloss irictudc ttccs. brush. aild

lit r mcar inn grit siga;lng tilc itrcatii banks inI t lic flood plain. Mani madectcicroactirctts

arid coistrrctiorrs such as dams, bricfgc. flosfssalts, lcscs. arid higfisa% arid railroadd

cribanrictrs cart also crcatc rmorc c\tcrtiskc floo~diiing thani ssoutd otlicrssisc occur. Srsit tf tire

2-' hridgcs that cros tbcS h I food plainisoit ()ttasa Risirantd I crrmilc (cck ss titfic stiicf\ uits

tic shoss i l I igurrcs I anid 2. (ntrrctitl\. local anthortitics sc plans to rcplacc Iaiouti RIoac

bi idgc it riS,- [trritle 11 6N( anid FBrit HRadIf brcf at miet urice 21 t(0 aIloing thecir picscri

Awi'riicnt. I tic prof tics arid floorided arca rrrapsirand bridcc chita;rtic bisccf oni th tc citig

sitictrrs arid dfo riot iclct file proposcd irnproxctiicrits.

\1tjrj fitte frile 11C.11 \rca L sadled I cnrirtlc ( ieik tromiNir \()tiiicc Hjis i10 its Ica-d%\.iicrs1

I Il' Cliii rtwiiric isofta Risci nunII si1t111 MiMrcc HKu\ tiittiCcmtitLICIrCC Ot IciitIiulc( cc'tk

tin Noi i H~richiI cirrriIC ( r CCk

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%k T1 \ I cattj111 tac oI tilt "t t fdiz Roaid Hi idic at mci mtile ~ tiw t

HII(REI I - M I AWA R1IR BRIDI ;S

49W-- .~

)o~krstrearn tace ot the South Mlain Street Bridge at iver miile 201)5 it)

I )owntsrearn lace ot the Peinn Ceintral Railroad Bridge at Riveir mile 20 24 in

S~Jvania. Ohio

FIGUIRE 2 - I I:NMII.F CRFFK BRIIMGIS

UTpstreamn tace of the Silica IDrix Bridgc at ri~ ci mi Ic 201 43 in S\ kariiia O)no

I )nristreamn face of the Kilburn Road Bridgc at rr~cr mile 29 20) neric

FI(;IRF 2 - I FNMI. ('RIEK BRII)GFS (continued)

7

I he location of each of these 27 hridges is slhto" 1 on the proliles at the end of the report.

I he sharp drop or "stair step" effect is the result of encroiachnent h\ the bridges and their

rlhdt as enthanktentis acloss the flood plain. [he magnitude tf this drop is an indication of

tle abilits or inabilit. ot the structure to pass the flood discharge,, under consideration. lie

ah,,ence ot these structures ssotild hraye resulted in a relatisel. smooth sloping line ft each

I he elexations on the profiles have been translated into flooded area,, on tlates 3 through

S. I prrcam of each bridge, the outline of the flooded area fains out as a result ot the restriction

to lhoss. I he degree to %shich this fanning out takes place depends a great deal upon botl) the

topograph\ and the magnitude of the drop shown on the profiles at each bridge.

No other significant structural obstructions to flood lo%\ arc located \\ithin the stud.\

reach. I lhe profiles and flooded areas are predicated upon bridge openings remaining free of

obstrucl lots llolse"er. it is possible for floating material to catch on bridge piers and lose steel

\shich ssould block tile \waterssa\ openings or clog oerbanks in \kooded areas. Similarl. . in

\,iter months. ice jams in the riter could occur which usould clog tei channels and bride

openings. Both of these e\ents sould tend to raise the flood elesations abose that shts li in tile

profiles. thus exaggerating the drop inl the profiles and the fanning out of the flooded areas.

hood damage prevention measures - [-xecutise Order 11296 requires that all federal

agencies dire tl\ responsible for the construction of lederal facilities. evaluate flood haards

%s hen platniing the location of liew facilities. In addition, this order requires tile federal agencies

responsible for admi nistering federal grants. loans or mortgage insurance programs es aluate

flood ha/ards il order to siiiniile potential flood danage and the need for possible future

lcicraI c \penditures Ior flhod protection arid flood disaster relief.

I lie Ohio I )epartniert of Natural Resources in concert x ith tile Corps of Engineers has

des eloped Ilood plain managenient criteria defining the nmlinimun requirements for an effectis e

regulatory program. Ihese are consistent with the requirements of the National Hood

I nsurance Program and federal Executive Order 11296 f'or other federal programs and

agencies. State agencies are requi red to coimplv with such criteria %khich discourage the locationofl oructures in the loodssa\ . as ssell as prescribed imitations w\hen deseloping in the flood\ a\

I ringe.

\s state coordinating agency\, the )epartment of Natural Resources also participates ill

tie lhood plain management aetiv\ities w% ith ither agencies of the federal go\ erninit other tha

the Corps of Engineers. fi that capacity, it administers the National Flood Insurance and

federal Open Space Grants programs ss hich hase application to flood plain manageriento~bjectlis es.

In Ohio the posser to adopt and enforce /oriing regulations is delegated to politicalnnbdis isionis. Ilie enabling statutes are \ithun (ihapters 303. 51 . and 713 ol the Ohio Res ised

('ode.

In the ('its of Ss lsania. )rdinance No. 31-74 as passed onI onc 17. 1974. Ihis ordinance

teqtire,, that prior to construction or subdiision a perniit be obtained froml the I ocal Hood

Pl;ini ,drllininstrator. ilie adllinistrator is responsible lor reitnessrug perriit application" itoassure cofnpliance "fillh the foll,nisirg pro\isions of tie ordinances,

I . .. . . i ,

-2.3 / I/i p'pm I .plic atit m /o r New ( on.% trut No ip it .Substantial Inijr. o vemem upIt

.)/x ii, Ip it, tor'C. Piermit app/i atm ox r pi t r uhstantial impri v'i;ii'pt

cpmx~r~p (p.pt (c Iing, jrelahria'c'i and nio hilt' liunt') 'pithin .Spt'. w lu" 'I

Hlaza rd A rta\ \halI be rev'iewped to a., arct t /t' I rp p/Pu sed p opixtruc tP 'i (al /

prP p Ic ;c,/ avouP i~t / /oo d dlamage. (h) iv deugnedpi. an (II ho iire' to ,'rt eetiP' dli' 'Iit

icillap~i. , -)lueral in,, Pein o1f/u the\ructurv'. (( ) iixt.' totitriitti miaterial um/i

ti/it v ec'ClimiPp t Ihat are rexixtatit 10 f/lood dani et. and (d) uvex% omtrup ii 'pi

pntlc / A api pp.1 ,'rehit thiat will 'itiipizi floodS dlampae

"2'.32, Sa/'/i it uI 1ropmuats and Ot/itr \ti Alc'/opmnet .4 1,phe aiion..S'iphpli p, 'i um o1 thier nic devei 'lopmient piro pm a/. loc'att'd tvahin the it/e i/it'dSocc ial/ 7/pd Haztard/ .4 rv. s/ial/ he re,'icuc d p'p' axarc that (a) al/ xaili priipo so/s art', ia 'it I'p he1/c tivec to milinize //fl lamnal:'p' (1,al/public pa/li, ii' atl lat ti%'

Mit I a\ Nti 'ipr, ',,aI.. icc 'prip a . antI water. .sw,'cp u., art'/ ateil. c/esated, and ( 00'. %rap tipI( P nii -i ,tp c//imat Ic //p. . danzag, andl (c) adteqate draitit' Ax irovia/ed %o a0% to

reo'upt' t, %p.JPPMrP 1to floodl ha~ardt.

"'\.,5'ti (ir Ryc'aenu'n Water Auli'/i anl San/tarp Sep. a,'t Si .%t'pp

A v.tcili lot ateil vvith/pi identifi'ed Speciial lood 1Hazard .4 rea., vhall be delcsictoUmnipnii'i .r i'/mnjaii' infl/trata i opid P.'ati'rs ipnto thre xpxti'ns and disp/iari'e.N

Iroth 'ppli sticoix\ Iflo od /i t aterx. (pin-sjte wpastie p/ixipixal xvxtemu v/ia/ At lo, atep o

ak to' p vo'p.1 impairien oit thempp 'or copn tatmiination Pit fl p themp duitw flp 'pi/ti ."

I-lootd w*arning and foreca~ting service - Althoulgh flood forecasts~ are rot nitdc for the()ttipssa Ris zr. the aiud 'v hinits are well wvithin the range of the wAeather surveillance radar atD et roit. I hie I oledp weather service office issues local flash flood s arninigs for areas cit hea\\precipitation by telet\ PC. SUhscrihers to the tcevpe serv ice can then relay this information to

the local cmi.ens,.

PAST FLOODS

Hood Records

Ihere are no stream gaging stations 'Aithin the study area on either the Ott;r'Aa River orlenmile (reek from which inlormation on past floods could be extracted. A record of highskater marks, however, has been obtained from the Lucas County Engineer which zies someperspective to the magnitude of past l]oods. The elevations of these high water marks are show nin I able 2. In addition, newspaper files have been searched for information concerning pastIloodN.

Flood Descriptions

Alrhough floods of varying magnitude have occurred on the Ottawa Ri\er and I enmile('reek, they have caused little dam.ige. This can be attributed to the little development in thelood plains. In ,1 uly. 1958. a summer storm caused flooding of agricultural lands in the stud\

area. Pictures of this 'lood are shown on Figure 3 and on the covei sheet.

Ihe Sentinel Herald briefly described the flood of February 10, 1959. Whitl's Inn, whichused to be located on North Main Street. had two feet of water running in and out the doors.Carroll Motor Sales, located at the toot of South Main Street hill, also had two leet of water inthe basement.

Ihe Svlsania Sentinel indicated that the Slvania area was spared Inaor tlooding b thelul\ 4. 1969 storm. Photographs in the paper showed tlooding over Ilarroun Road nearI enmilc ('reek.

It)

Hoo~ded tarniland at the coiner ot S%1\anla A~enuc and M itcha\4 Roadlooking north trom S Ivarna A'~enue

rr -

Flooded farmland at the corner of Holt Road and N4itcha% Road

FIGURE 3 - F-LOOD) SUE NI:S IN SN'I VANIA tOWASHIP.July I5. 1959

TABLE 2

HI(H WATER MARKS

Miles Above Elevation. feet (Lucas County Datum)'Mouth of May 7, February 10,

Bridge Ottawa 1971 1933 1959 1961 OtherIdentification% River Flood Flood Flood Flood Flood%

OTTAWA RIVER

S , It.a .\cnuc 16.91 607.15 603.48 602.91 602.50Slurhridgc Road 17.65 606.70'Ilarrourn Road 19.68 624.70 622.60 622.42 621.70

TENMILE ('REEK

silica I 01%c 20.43 632.28 634.61 633.80Hrinr Road 23.03 655.70 655.30 655.16 653.90 654.70,S\hana A'enuc 24.21 661.20 659.18 658.18 658.30 658.87('cntcnnial Road 25.17 663.26 662.60 662.77 662.3tlcrr Road 25.98 668.71 667.99 666.66 665.X61

hanja -\,cntic 2o.88 672.34 670.72 669.08 669.9Brint Road 28.50 680.20 678.72 678.46 676.4S\k\ ra lc taora Road 29.95 687.04 684.90 685.16 684.3

1( ount% datrui ininus 0.492 Icet equals I .S. (Geological SuirVc. dalurm

'uk 4. 1969

11944

12

FL TI RE FLOODS)

I arge floods hte been exsperienc~ed in tile past 05cr %kiatersheifs oiotd slireams III if)ieenueral geographic and phvsiographic region of til, sttuds. Intense stormis simillar ito those.

causing these floods could occur over thle OttawNa Riser ssatershed. It is. theretore. decsira hIe III

determining ftulre flood" ltr this studs area to consider stornis and floods that liase otireictin the region oser ssaterslteds w\hose topography. \%ittershcd cower. and phs sical character isti~s

are silnilat.

Information oft this nature has been collected and complied in Hulf1CInI 43: for streantsl Ill

Ohio. Proced tires descri bed in this publication "ecre used tin determi ni ng thle appropriate

discharge rates for thc aiotis flood frequencies under consideration.

5111-Vear Freqtienc Flood

I he 50f \rrcrquenc\ f'lood has a 2 percenlt chanjcof occurring in anu giseir seal Sincethe f'lood represented b\ this frequenlc is statfitlls at ore ~ommllonl event than Ciffhet tie

Intermedfiate Rcona I Flood or Standarid Project Hoods.(1 thle magnI~itude of its floodf floss s

sho),%ii in I a bl -3 is less. (.'rider the phi siograph ic features of this ss atershecd. thle 50t \eat

freqfuec e flood fHowss represent a ho ut 86 percent of tire Inite ried iate Reg ion al H ood fl"N

I hie profilesiat theceid of the report illustrate thle elesation tos hiic ech of the floods exatutitred

is expected to reach Itt relation to the streamn bed and top of lossk bank elesailon'. .\lo\t losi t

these profiles are the location of bridges atnd sursesedCL crossWsections Ihis infortionI(l call beused to better (ocate problemi areas iif particular interest

Intermediate Regional Flood

Fihe Inlte rmed iate Regional [food is define~d as at flood hasIn it l) an C~iL asLIIC1 (r11feutix

probabilits of occurren'ceI of once in 10 f\C sars or at flood that has, a I percent Chatnce ot

happening in all otie -\carat at designiated location. I his Ii a mor flood, althoughl corisideiabls

less sesere than the Standlard Project [food. Within thle stuld\ area. flo%\N s rpreselutit tileIntermediate Regional [flood are about 33 percent of thle Standard Project I food. Ifhe profiles

and areas fHooded bs\ the Intermediate Regional [food are shoss n at thle enl of the repoit

Standard Project Flood

()itl inl rare instances has at specific streamn experienced thc largest flood thatl is likes ito

occurl. Ses crcas thc miaximumiti k nossnflood may basec been ona ns gisen stream,. it is cominionlx

agreed that ai largerflood can occur. I he Corps offEngineers. in cooperation wi ithile Natiotial

Wait tlier Sers icc. has miade comiprehiensive sftudies and insest igat ions based ott ii ds of

e \ perienced stormns and floods. Withi these, at generaliied procedure I ir est inmati tiL flood

potent ialI has,. been developed atnd used in determi ning the. Standard Project I looid. ft istdelined

ais the largest flood that can be expected from thle most severe comintatiotn of nieterotogicat and

Its drological Cotnditlolls thatl is considered reitsonabfs char acteristic oft tire geoirgaphicat t egiotn

insofsed. ft represents at reasonable tipper limitt of flooding. It is tiot practical to .isstet aifrCqitenexC to the Standard Project Hlood hecaiise of the soitushat litmited datat aiilable. f lue

magnitude of thle Standard Project Flood represents at recturrce intersal "ellft i ecess iot tieIntermiaIite Re , iotiat I food. I hie profile and areas flooded bhe IStatliard Protect I li0od ;ileshlos Ti it (tic end oft the report.

F loods in Ohio. \1ugniudeand F reluettex. at supplement to Builfetin 32.'h bx S ( ieologtcafSirses ti cooperaiton swill the I~issorn of "a ter. Ofruo I epmreu of Nauiirit Resotices,

TABLE 3

PEAK FLOWS

Miles Above Flood Discharge. cfsMouth of Drainage 50- ear Intermediate StandardOttawa Area. Frequency Regional Project

Location River sq. mi. Flood Flood Flood

OTTAWA RIVER

l)o%% n~t ream Study ILimit 16. I 125.37 5,300 6.000 19.000\ho\ c Harroun Ditch 17.70 122.41 5.000 5.750 18.000'

"ENMIIE (REEK

\t Mouth 19.95 80.7 3,900 4,450 13,700\bo e Schreiber Ditch 21.98 73.21 3.600 4,200 12,80 1,Nhne Conistock and Sharp Ditch 24.23 67.04 3.350 3.850 11.700.\knc Prairie Ditch 26.10 46.8 2,700 3.100 9.500,\hoc Butler Ditch 27.88 41.36 2,500 2.900 8,7(()Abo~c Roberts Ditch 30.30 33.91 2,250 2,650 7.900Vpstream Stud\ Iimit 31.90) 35.55 2.250 2.650 7.911)

14

Comparison ofl tile peak discharges expressed in cuhic feet per second .shir n ii] I ahlecindicates that thle Standard P roject Flood flows are over Iliree IIIes as great ats the I nierminedir 0c

Regional Flood tlos s Computed profile elevations ott the I ntermrediate Regional a rid Sti idalrdProject Hloods are compared with bridge elevation,, Ili I aihit 4

Hazards of Large F loods

['he amntI a nl Cextenlt of damage Calused h\ at flood depends. in general. upon tile c Slnit

oft des elonoment tit the area flooded. the depth of flooding'. th lie locit\ of llos% . the rarle (it r sc.

and thle duiratiori of flooding, D~eep floodw ater tioming at high xelocits aind cai:\ inc tl,.;i~lirC

debris could create coritions ha/ardous to persons arid %cliicles ttemnpting to cross flooded

arceas. In) genler-a ft uid saler 3 feet deep or more and flow.ine 'at a \eloCit \ of 3 feel per secid or

more Could e sw seep air adult person oft his feet. thUS creating definiute danger of inii ti

clrirssing. Watter lines can he ruptured by beirg e.\piscd dute to the erosi\c e ,'r iii orfloodwater, tli itscreating the possibility of contaminaied domiiestic ater so ppl es.. Inuiiiiar

o1 roaidwas s can flood sanitary sew~ers, causing sewage ro back uip inb balsemntls. I litCi

periods of flooding not only create severe hardships for residents and businesses. hill alIso Postflood structural and sainita rv problems. Swelling, sa rpi nL. and scrtrling of bii di ng, id trle

"sidespread distribution of pollution-laden debris a rd sit confrontl ll] attected residents

Isolation of areas h\ floodwater could create ha/ards Ii terms of mnedical. tire, or [it\%

enforcement enierpericies.

Flooded areas and flood damage - [hle areas that s orild be flooded b\ the Inrtermediate

Regional and Standard P~roject Floods are shown on Plates 3 through S. Ithe flooded outIi ieN

a long the tributaries upstream of their contf uence wit the main) stem represent thle deaid Iles e

backw~ater flood elexation from the main stem river and do riot reflect peak runoff conditions of

the tributaries themiselvs. Actual lim-its of thle flooded area onl the ground ma' dfiffer trim thatshowir. as the 5 foot cointouir interval anid map scale do not permit precise plorriuru of

boundaries.

Obstructions - I \&entv seven bridges span ()ttassa River and I einile (reek sAllIl tnlre

stud\ reach. Of the eight across the Ottawva River, six are public andI two are prli are I tie

remaining I19 cross I enmile Creek and consist of- 13 public roads, 2 raiilroiads. and 4 Pr i% ate

roads.. No other significant structural obstructions to flood llosss are located \kithin tie slirfx

reach. As indicated tinder the discussion on IFactors Affecting Flooding' arnd Its Irmpacr.

waterssav openings of bridges may become clogged, thus increasing flood elex alions. Since it I

impossible to forecast these events, it wais assumed fur these flood duterrriiraioris thati;all biridec

st ructires ss otld stand anrd that no clogging would occurT.

N elocities of flois - Water veloicitics dIuri ng f loods depend lir rec\ upon tilie si/c anrd shiapeof the cross sections. thle condition of the stream, and the stream bedl slope. All of \A, iicf\ arl oil

different streams and~ at different locations onl tile samei sli rarm Di )rivg air titer iredialL

Reg'ional IFood. \elocitres in thle main channel Asould range fromnth0,8lto 14.3 feet per seconid

)s erbank eclocities ssould gerieralloi be less t han 1.5 feet per second. butl \,\oild realch 14 leerper secondl Channel \elocities during the Standard Project [food would range f roni 1. 1ft

I t)L5 feet per second. Overhank \ elocurues would generally he less t rii 2 feet per second. bilt

w~ould reach 4.4 feet per second. Ihe dangers encontnered ats at resiult of high \cloLtiCN a iL

decscribed tindefr the section. Ila/ards of I ,trge Floods.

P1hotographs of design flood heights - Intermediate RegiorialI anrd St,irntaird ProjcLI I loo1

lesels reached it sar otis locations in tile stints area are indicated onl Iigures, 4 arid S

TABLE 4

ELEVATION DATA

BRIDES ACROSS OTTAWA RIVER AND TENMII.E (REEK IN SYLVANIA AND VICINITY, l.A (ASCOUNTY, OHIO

Elevation. feet (I.S.G.S. Datum)

River Mile, Intermediate' Standard'Bridge Above Mouth Regional Project

Identification of Ottawa River Stream Bed' Low Steel2 Bridge Floor2 Flood Flood

OTTAWA RIVER

Intcrtate 4,5 16.81 594.7 613.3 617.3 607.37 617 13SYl'.ania Axcnue )6.91 593.2 607.6 611.9 (08.05 616 I1

Sturbrdgec Road 17.65 597.8 612.7 614.6 618.61 61s.33

PIr\atc Road 18.01 600.3 609.5 611.3 611.60 619 22Ir'.ath Road 18.73 605.9 614.5 616.5 615.92 o22.17

( S. 21 N. I \it Ramp 19.23 609.4 628.6 630.1 618.64 626 61I S. 23 19.28 610.2 627.0 629,3 619.63 t,31 01

Ilartoun Road 19.68 613.6 627.2 63(0.4 623.42 631 .6

TENMILE ('REEK

South Marn Street 20.15 623.3 633.3 638.1 630.57 639.x]

'cnn (entral Railroad 20.24 624.8 647.24 653.1 633.10 640.1-ISilica I)r'.e 20.43 628.2 638.24 643.9 637.78 64" 90()ldc Post Road 21.02 635.6 645.4 648.6 644.68 65) 9)0

I'r'.atc Road 21.24 637.2 643.4 646.4 64.96 653

Bonmebrook Road 21.84 642.2 653.7 655.3 651.39 65-,0Pri'atc Road 22.24 643.3 65(0.8 652.6 654.5( 65q

Hrint Road 23.03 645.2 657.(0 659.0 657.s3 ,62 14

5',l,ania A'enue 24.21 649.8 660.8 663.1 661.46 6(309"

I oledo A.ngola & Western R.R. 24.55 65(.6 663.1 666.9 663.92 668 55(Centennial Road 25.17 652.2 666.6 67(0.5 665.00 (,-o.12

Pri'. are Road 25.55 653.4 664.2 665.6 66640 ',7.l 26

llerr Road 25.98 654.6 668.8 671.4 66"7.25 6-1) s

S\ani;a A\'enuc 26.8S 659.5 672.5 674.4 669.47 674.58

Hrint Road 28.50 670.0 6X0.5 683.1 67764 6 I-

P'r,.ate Road 2s.72 671.3 678.6 68(16 679.61 t' 1.64

Kilburn Road 29.20 673.4 682.14 684.6 683.75 tx5.12Sl'ana Mlctamora Road 29.95 675.8 6X8.0 690.5 685.52 690 1

(iibb,, Road 30.38 678.2 687.2 689.8 6861 691.36

'1 leatio at h'.point fn channel1 le'ataon at center of bridgeH ' Iation at upstream face of bridge

I lc atiron at top ol arch

16

Sturbtidgc R('d Bridge at rier im'

117 65.

Sanra CV~gc Irtrten't lnta zli

ri'\er mile 1 9.S6~

IC I R F 4 - I I ()) It U[(%d IIS Al I 0 ; (i I I A WA R I VI R

17

-; SALES#,.SERVICE

-~USED CARS

commercial building on mNi 'St reel

u~S..F.

-IR. F.

Residential development along

Apple ('reek Road at rier mile

20,74. [his area would not be

inundated by the IRF.

FIGURE 5 - FLOOD tjFIGITS ALONG 1 I NMII.V ('R! K

'let

Brint Road Bridge at river mile 23.03.

FI(.1'RE 6- F-lO0t) HI(ilI I SAlON( I FN-MiI ('R[IIK((otntinuced'

(.1OSSA 14Y

Backl%ater. I lie resulting highwater surface upsir am (roi a damn. hridge or ot her

obstruct itin ini a isci chainc I \Iso, thle hods of relatiscls\ 5til I %aters tin trihutaries or los% ks ing

a rca s, has ing access It hcl main hod o f water.

Channel or \Natercours. .An elongated dcprcssion Cit1 hcinttural ornman madehas 1w .1

bed and \%ell dclimcd hanks %arying in depth, width, and length. ss hich gixcs, direction to a

current oft \xa cr anmd is normials descrihed asitc rck, Ntirca in. or ris cr hed]

(ros%-%ectioa. .'\section taken trarisvcrse or at ripl't angles to ihe asis oit the chatnel

showsing tile dept h of t hc cha nnel rclatise ito t hc channucl haiks and higher ground.

D~atum. .- ni assumed rcference plane f'rom \khih lccsations and dept hs arc micasui cd.

suc h ats froum Nca les ci.

Flood. A tcinporarv os crflow by at rixcr. strcam. occani. lil~e, or oilhcr hod.\ ol \tis at

lands, not nornalls\ cos crcd by %%atcr. It does not include t hc pond ingc of surfacc \.kaici duie to

nadcquatc drainage. such ats wit hin at dcvceloptnent. It is characteri/cd hx daniaging

nunda~tion. hack\%ater effects of' surcharging sewers and local drainagc channcels. and h\

unsanuiaix conditions wsithin adjoining floodcd hahitated arca attributablc to pollutatnts.

dchris. and ss atcrta hlc.

Flood (, [ht.]e niasinun stagc or ecx ation rcachcd bh\ flood watcrs at a gix ci,

location.

Hlood Peak. Ihci maximum instantancous discharge or olunle of flosw in cuhic feet per

second passing at gix cn location. It usuall\ occurs at ort ncar thc time of t hc flood crest.

Floo)d Plain. Ilic rclatively flat arca or lowv lands coxered hv flood \stecrs originat ing

wsith cither tilc adjoining channel of at water course. such as at riscr or strcanm, or at bod\ of

standing .katcr. such as,, an ocean or lake.

Hlood Prorele. A graph showing the rclationship of ssatcr surf acc ecx ation to location

along thc streamn. [he latter is generally expressed as distance ahovc the miouth of the streami in

miles. While it is. drawn to shows surface elevations for t he crest ofit specific flood. it mas he

prepared b'r conditions at any' other given time or stage.

Hlood Stage. [he elevation at which ox erflow\ (if the natural stream hanks or hodo

water occurs.

Frequency. [he expected recurrence interval f'ora gixen si/c flood based upon lone ' g iiir

statistical prohabhility. Large floods are less frequent and smaller floods arc Momre I req ient

G;age. An instrument installed upstream from, hut xs thin range oif lie cross section or

reach of the river in question to determine nltuations and stage wsith respect to time

Head Los%. [hle efflect of ohstructions, such as riarross bridge openings, darns or

huild ings that limit the a rea th rough wsh ich water must floss, raising thle so rface of xs idc

upstream from the obstruction.20)

I Iead% ater. I I ie- itt hua ries %% hich are Ithe sources of sicams

tII..dropraph. \ Lviph denotini the dt eharlre "r'I e of ffosm oser a PCI od of tll,

Intermediate Regimial IHood. A flood hiasrg aii is erii~c Irttitflc of occurrence in? h,

ORder of onice IIiI ft 5M eCj,i Is .111i.'iii tile floodt Ina~\ .i..c ti m\ ir L',a1 hit hased oil sfli il

.inafs 'istit stIcami loss recolds jsaifahe for1 thle %%alt-erse and aiial.\sis of rairifall and ril

CharACteistics1 III Oie tLenci i reion of [lie wttersfied.

Lefrt Rank. t ire hank ot the left side oft a ii'ci strecaml or kkatcrcoUrse. lowkiii

I ii% Steel I or inulerclearancc i. Sece I nder e Laraice

Right Rank. Hic harik on file Fight side oII the rt set stream or s.i1r0isc okiIre

Standard Pro ject Flood. I he flood that Tm\ he c Speeted f roni the iost sexct e

co11"Inhintio of ItreteorofogLicaf arid hs~drofogieal condition Ouiri are considered reasiitihscharacteristic ,, 'lie 2co~apliieal arcit tin shielifile drainave hasin i, loeated, ec\luding11

e\treiiief raej'ihi~tin.Pa icagsfrtis finsaegnrfs.hoiit 4fpereiII to01f) percent ofI tile l'oh-ife Mainium flods for the samie hasits. Such floods, as used h\ tfic

Corps of I- n, iteer . arIc IIn tenrded as pract cal ex\pressions, of the iferce of protect luthat fioifd

be solwit III 111e dienwi of Iood co)itruif ssorks. the ftilir of Mufcfi miehit he disastirous.

I nderelearance. I hefic s point of at hridc'e or ofther striturei ox er or aers s ai iser.stream, Or Hsieei IMe fiat s ft i te opetning through Mithiixae iss i srfre o

"1%ossseel' in somTie reL'ionN

Sattershe'd. I lie IrI LA d railed] hs aI ri oit ris etv stein I lie Ternis ''druinaeLe hasiii' anf

'ssatcrshed ice \s noim miou'

Sater-stage Hec'rder. \ deo ice for prodtit ri, er ph capldl fs . ot herss vc. a recor-d of fTle

ise andl f;iff of a %kdilr mrkfice xs ith respct to lie.

\% ire-i~eight (-a ge. \ rie gage ini ss i cl ai ssig lit siijspetidd ott "sire is fuss ered t. the\satel stirfice firomt ai oserlicad strucltre to measur"e thle distanice fr-om a Poinit of knoss il

C10;a1ioti ohI thle st11iM icI tite sater surfa3ce

Al III1ORITN' AND) A( KNONNI.IKI)AENA'h

I Iris cport fias, hienr prepircd h\ litirges & Ntpfc. f imuted tinder the direction IIf Ire

Detrtuu Di siructo if c I' S. \rris ( onps of Inunrneers iit1NIl aecotiuTice %%ith Itfieat imrt\ vranted

h\ Section 206 oft file Flood ( ontrof Act oif 19~60f WI Xr6-4f65f I aniienfef.

Assustatuee and cooprtion01 Of federTul. state,2 and foeAf AOCTneues Inl siippfi"e1 iseltif

unfolrmatuit aMc ;uppfreeiafed. irctiites(if thle ltils f5 1 958 flood ssere pros tfed hs \Ir /eno

I itugenderfer

i4.

4-4. =A

-. -- -eUPTREAM LIMIT OF STUDYV

16 1

E L

A,2A

83 31

148 P E N~ r itK

4. 4

W~~ D F 6EFR

SYLANA NDVIINITLUA CUTYOI

22tI J O 20,i

21?

5Lr

19 16 rivt-IITheatei

10

com

1312 11

same

8- - -- -- - Wa

T

5

,650 4

Compkt4takond?

475

0 CN LEGEND

OVERFLOW LIMITS

I MiliviSTANDARD PROJECT FLOOD

INTERMEDIATE REGIONAL FLOOD

WA #A+19.0 MILES AbOVE MOUTH

WAY i)-- CROSS SECTIONS41 rT L.18 WAY

650 *BOUND FLIVATOI'I IN FT. (U.S.G.S.)

MAN VIEILL SEA LEVEL DTUM OF 1929CONTOUR INTERVAL 5 FEET

I. NOTES

1. B ASE TOPOGRAPHIC MAAP IS AN ENLARGEDSYLVANIA, OHIO-MICH. U.S.GEOLOGICALSURVEY MKAP

2. LIMITS OF OVERFLOW INDICATED MAY VARYSOME FROM ACTUAL LOCATION ON GROUNDAS THE 5 FOOl CONTOUR INTERVAL AND MAPSCALE DO NOT PERMIT PRECISE PLOTTING

3. AREAS OUTSIDE OVERFLOW LIMITS MAY OF*SUBJECT TO FLOODING FROM LOCAL RUNOFF.

t U-

00 9 0

4. 0

00

- -

0mm CORPS OF ENGINEERS, U.SARMY

* SYLVANIA AND VICINITYLUCAS COUNTY,O)HIO

LIOtis

NOTES

I BASE TOPOGRAPHIC MAP IS AN ENLARGED L~SYLVANIA. OHIO- MICH i S GfOiOGiCAi ot

SURVEY MAP

2 LIMITS OF OVERFLOW iNOICATF$D AAY VARY * CouSOME FROM ACTUAL LOCAl ON ON GROUND0

SUBJECT 10 iLO ODING FROM IOCAL RUNOFF. a

6 7 5 0/

Q6a

*.s '

CIS

47

IN0

j. ST

Golfo* cou

o00

665 a-j/ "=--

LEGE N D

a OVERFLOW LIMITS

a STANDARD PlOJECT PLOOD

* • :II *6 L.---46 INTERMEOIATE REGIONAL FLOOD

a---6 M+22.0 MILES AbOVE MOUTH

" , ---.. ! : II CROSS SECTIONS660A.J GROUND ELEVATION IN FT. (U.S.O.S.)

L 0SEA LEVEL DATUM Of 192"

H..!CONTOUR INTERVAL 5 FEET

6 ~ I CORPS OF ENGINEERS, U. S. ARMYS "'DETROIT DISTRICT

, o0,9 FLOODED AREAS6 1) 0 OTTAWA RIVER - TENMILE CREEK* SYLVANIA AND VICINITY

LUCAS COUNTY, OHIO

675 SALI

i ,T r 4

M+ 24

'I'M P

FWA~S L as a .

.**S* S

a 4D-

671'

OakW

0 01 3* MLE GoEkDU

CORP O E RFLOEWR USARTS

Q1 STFLOODED AREASOOOTTAW RIER'Af EGIONAL CREEK

jib. * #SLVA N S A N DV V C UI I Ta 6?5 6LUCAS COUATNT OIOT

CMFt*"'T' ~ 3Fl

0 00

1% Golf6 Cour

- LI) OINERFLEDIAT IT

669REDAT REGIONAL FLOOD I BASE TOPOGRAPHIC MAP 1669 BERKEY, OHIO - MICH U.

M +260O MILES ABOVE MOUTH SURVEY MAP

2 LIMITS OF OVERFLOW Ia CROSS SETOSSOME FROM ACTUAL LOC

AS THE S FOOT CONTOUR

665 GROUND ELEVATION IN FT. (U.S.G.S.) SCALE DO NOT PERMIT PIRSEA LEVEL DATUM OF 1929

3 AREAS OUTSIDE OVEUFLO

CONTOUR INTERVAL 5 FEET SUBJECT TO FlOOD 1

/Mo ' ' '

..00KY _RAL ........ LAW.

;.;1 61' T

, ..... .. .. ..... .. . /

NOTESCORPS OF ENGINEERS, U. S. ARMYI IASE TOPOGRAPHIC MAP IS AN ENLARGED DETROIT DISTRICT

BERKEY OHIO - MICH US GEOLOGICALSURVEY MA F -1LOODED AREAS

2| LIMITS OF OVERFLOW INDICATED MAY VARY OTTAWA RIVER - TEIMILE CREEKSOME FROM ACTUAL LOCATION ON GROUND OTT A A AND VCIN I TYAS THE S FOOT CONTOUR INTERVAL AND MAP SYLVANIA AND VICINITYSCALE 00 NOT PERMIT PRECISE PLOTTING LUCAS COUNTY, OHIO

0 IooO 20OO

2 AREAS OUTSIDE OVERFLOW LIMITS MAY BE SCALt - M F I I T

SUBJECT TO FLOODING FROM LOCAL RUNOFF '97,

F +291CORPS OF ENGINEERS, US. ARMY

DETROIT DISTRICT

FLOODED AREASOTTAWA RIVER - TENMILE CREEK

SYLVANIA AND VICINITYLUCAS COUNTY,OHIO

01000 2000SCAL 9 FEET

1975

LEGEND 70 MRINT

OVERFLOW LIMITS

STANDARD PROJECT FLOOD

[-- INTERMEDIATE REGIONAL FLOOD

M+27.0 MILES ABOVE MOUTH

9 CROSS SECTIONS

675 GROUND ELEVATION IN FT. (U.S.O.S.)SEA LEVEL DATUM OF I929

CONTOUR INTERVAL 5 FEET

NOTESI. BASE TOPOGRAPHIC MAP IS AN ENLARGED

BERKEY, OHIO - MICH. U.S.GEOLOGICAL 66SURVEY MAP.

2. LIMITS OF OVERFLOW INDICATED MAY VARYSOME FROM ACTUAL LOCATION ON GROUNDAS THE S FOOT CONTOUR INTERVAL AND MAPSCALE DO NOT PERMIT PRECISE PLOTTING.

3. AREAS OUTSIDE OVERFLOW LIMITS MAY'BE 6

SUBJECT TO FLOODING FROM LOCAL RUNOFF.

6 SYLVANIA

00Sz

5

5

a a

711

WNIM

66P"I

SoutjhlandU a 3

U EA6T2 ' 0

AtoN K E'~ . 9

7

LAWIIa7

LEGENDOVERFLOW LIMITS

STANDARD PROJECT FLOOD

outhland ....- ' INTERMEDIATE REGIONAL FLOOD

- - as M+ 3.0 MILES ASOVE MOUTH

YvANKEE 6990 CROSS SECTIONS

GROUND ELEVATION IN FT. (U.S.G.S.)SEA LEVEL DATUM OF I9

CONTOUR INTERVAL 5 FEET

NOTES1. BASE TOPOGRAPHIC MAP IS AN ENLARGED

BERKEY, OHIO - MICH. U.S.GEOLOGICALSURVEY MAP.

a 2. LIMITS OF OVERFLOW INDICATED MAY VARYSOME FROM ACTUAL LOCATION ON GROUND

* AS THE S FOOT CONTOUR INTERVAL AND MAP

SCALE DO NOT PERMIT PRECISE PLOTTING..... , 3. AREAS OUTSIDE OVERFLOW LIMITS MAY BE

SUBJECT TO FLOODING FROM LOCAL RUNOFF.

QS

00 0YLVANIA " METAMORA, . *

• •so

CORPS OF ENGINEERS, U.S.ARMYDETROIT DISTRICT

FLOODED AREASOTTAWA RIVER - TENMILE CREEK

80- SYLVANIA AND VICINITYLUCAS COUNTY,OHIO

SCALE S- -lo 20 rtt,s ooS

________________

670 - ~ --------- -64

. ./ . . . . Pro files roeprenefi 1974.~~~~ ~ ~ . . . . . state of urbanization and

. ...... channel conditions

..... .....- - - /oav -n ro~ iA -U

C) 650 0

640- * t

IAJ

620 atJ

4/ - ___ ___

6 . . . . . . . . .

.IE .B V .A. .I. .O. 07.

670 640 , --.. 64',

.. ........ .~-~ $44IV"4 -AIPo4.

4 w ~~ qqMJi CRE_*, --

.*.. . . . . . . . . .

.rri i .er s n ./9..74. . . . . . . . .. . . . . . .. . . . . .. ..i~ i n s. ... . . . . . . . . . . . . .

2v .lod a .f~O~AhA .f . . . . . ... ... .

. . .. . . . . .. . .. . . . . . .

60 N6rc 630_____ ________

'4.r

t$rfie40pesn 1 .___ _ .6/V .. Q ... ..

-t--- ~~~~~. Stt fmbn~fof n

650 0 _______600

CORP OF ENGINEER.,... ARMY.

DETOI DISTRICT

FLODPRFIE

to~~~1 OT TAWA &I4W TNIE RESYLANI AND VICN0T

MiLES~! QIOV AWYJj .F .~U RIE L.A COUNT.O..

178

C/oAT 5

.... ... .. .

t z ... . .. . ..... ... .. . . .

.. ..... ...... ... ........' . ........

- ~. . . .. . . . . . . .

~~~~~ . . .. , • , • . . . ... . . . . . . . . .

+ +

..:r. ... .... .. .. .

. . . . . .

. . . . . . . . . .

.. . . ....j. ..

4<1 IA .+ .. ..L i. ....o

274 .* a .

+VLE + 5I +fIN 0 rrw I

. . . . . . . . .. . . . . .. . .-- +v c

* / Profiles represenf 19,4 StO* Of urbonIzOPIOnand chann~el condifions

--- ~~ .,...-.--- Z FbodwaW AcmOcnmeof can ra/ise profles

. . . • . . . . . . . . . . .

ImI

... . . . . . . . . . . . . . + "'

........ ..........

... . . . . .. R . .I.

40

.... ........ .... CORPS OF ENGIN4EERS, U. S. ARMY.. DETROIT DISTRICTIi~K~' r *rFLOOD PROFILES

... L....... _..._, 530 OT TAWA RIVER- TENMILE CREEKr2f SYLVANIA AND VICINITY

LUCAS COUNTY.OHIOor OTTAWA IVER of

Ii A ". to

650-

640 . ---- . ............. ... "

6 3 0 1 " .... ..... . . .. . .. . . . .

630

S 6 10 .. . .. .. ...

600-_CROSS SECT/ON 1'

MILE 90

0 I 2 3 4 5 6 7 8 9 /0

670 :

.. .. . ... .

4 630 . . --~ CROSS SECTION 32

MILE 21.26

0 / 2 3 4 5 6 7 8 9 /0 /

H/ORIZONTAL DISTANCE IN HUNDRED FEET

LEGEND CORPS OF ENGINEERS, U.S. ARMY------ ANDRD PRO.rEC rFLOoD DETROIT DISTRICT

....- INTERMEDIATE REGIONAL FLOOD

. - - 50 YEAR FREOUENCY FLOOD

Sep,**# .., .. t,. ,--.--,,-"Its"o CROSS SECTIONSS"ems.a o*. b~e*" OR of.a/ hoo~d v.urq a"US felpi°, #,,,,°, map# OTTAWA RIVER - TENMILE CREEK

SYLVANIA AND VICINITYLUCAS COUNTY, OHIO

1973

Pi ATE /I

560

I4O ........

640

. . . . . . . .. . . . ... ... .

SO ....

.::::-CROSS SECT/M 7- '

....... MILE 28 jO6 6 0t

0 2 5 4 5 6 8 9 10

.. .. . . . ..

..............

................. ! rr-- - --- - -........

.7 , .. . . .. . .

£~~~~~ 3"o 6 P 9R 3 A

HORIZoovrAL 0/STANCE /W MVWhVAED FEE?

CeWsS SECT/oA 51

01L E tE..0

*'f-31DVAR ! OttVLCO

-ov. @&d FRMEDAq AVGILWA ' 'LX2

77. .. .. nes

.. . .. . .. . .E- ~

CORPS Of ENGINEERS, U.S. ARMY

DETROIT DISTRICT

r~lli- 60CROSS SECTIONSOTTAWA RIVER - TENMILE CREEK

SYLVANIA AND VICINITYLUCAS COUNTY, OHIO

Pt rt

ILMEIF