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Flood Insurance Study, Hamilton County,Tn
	ML19323E259
Person / Time
Site:	Sequoyah
Issue date:	02/28/1979
From:	; HOUSING & URBAN DEVELOPMENT, DEPT.OF, FEDERAL DISASTER
To:	;
Shared Package
ML19323E257	List: ML19323E256; ML19323E259;
References
	NUDOCS 8005230283
	Download: ML19323E259 (49)
	v • d • e

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l FLOOD m d.h^h '~~'

INSURANCE STUDY

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HAMILTON COUNTY, TENNESSEE l (UNINCORPORATED AREAS) [?

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l I FEBRU ARY 1979 8005230 g gj U.S. DEPARTMr:NT of HOUSING & URBAN DEVELOPMENT l

FEDERAL INSURANCE ADMINISTRATION

TABLE OF CONTENTS Page

1.0 INTRODUCTION

1 1.1 Purpose of Study 1 1.2 Coordination 1 1.3 Authority and Acknowledgements 1 2.0 AREA STUDIED 1 Scope of Study 1 2.1 2.2 Community Description 2 J 2.3 Principal Flood Problems 4 2.4 Flood Protection Measures 6 m

3.0 ENGINEERING METHODS 6 3.1 Hydrologic Analyses 6 3.2 Hydraulic Analyses 8 4.0 FLOOD PLAIN MANAGEMENT APPLICATIONS 10 4.1 Flood Boundaries 10 4.2 Floodways 10 5.0 INSURANCE APPLICATION 11 5.1 Reach Determinations 17 5.2 Flood Hazard Factors 18 5.3 Flood Insurance Zones 18 5.4 Flood Insurance Rate Map Description 19 i

TABLE OF CONTENTS - continued Page ,

6.0 OTilER STUDIES 19 7.0 LOCATION OF DATA 22 8.0 BIBLIOGRAPHY AND REFERENCES 22 FIGURES Figure 1 - Vicinity Map 3 Figure 2 - Floodway Schematic 17 TABLES Table 1 - Summary of Discharges 7-8 Table 2 - Floodway Data 12-16

Table 3 - Flood Insurance Zone Data 20-21 1

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< EXHIBITS f

, Exhibit 1 - Flood Profiles

-Tennessee River Panels OlP-02P Possum Creek Panels 03P-06P l Sale Creek Panel 07P Rock Creek Panel 08P Wolftever Creek Panels 09P-12P

-Chesnutt Creek Panels 13P-14P I Lookout Creek Panel 15P Wilkerson Branch Panels 16P-17P North Chickamauga Creek Panel 18P '

Exhibit 2 - Flood Boundary and Floodway Map Index Exhibit 3 - Flood Boundary and Floodway Map ,

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f TABLE OF CONTENTS - conti;.aed l

PUBLISilED SEPARATELY:

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. Flood Insurance Rate Map Index Flood Insurance Rate Map e

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FLOOD INSURANCE STUDY HAMILTON COUNTY, TENNESSEE

1.0 INTRODUCTION

1.1 Purpose of Study The purpose of this Flood Insurance Study is to investigate the

, existence and severity of flood hazards in Hamilton County, Tennes-see, and to aid in the administration of the National Flood Insur-ance Act of 1968 and the Flood Disaster Protection Act of 1973.

Initial use of this information will be to convert Hamilton County to the regular program of flood insurance by the Federal Insurance Administration (FIA). Further use of the information will be made by local and regional planners in their efforts to promote sound land use and flood plain developrent. i 1.2 Coordination

)

The Hamilton County Flood Insurance Study preceded the Consultation and Coordination Officer Program. However, in the process of this work, the Tennessee Valley Authority (TVA) has worked with local communities concerning flood damage abatement and flood plain man-agement through its flood relations staff.

1.3 Authority and Acknowledgements The source of authority for this Flood Insurance Study is the Na-tional Flood Insurance Act of 1968, as amen'ded.

The hydrologic and hydraulic analyses for this study were performed by the Tennessee valley Authority for the Federal Insurance Adminis-tration, under Int?r-Agency Agreement Number IAA-H-6-73. This work, which was compleceu in October 1973, covered all significant flood-ing sources in the unincorporated areas of Hamilton County.

2.0 AREA STU"IED 2.1 Scope of Study This Plood Insurance Study covers the unincorporated areas within Hamilton County, Tennessee. The following areas are not covered in

. this study: the City of Chattanooga; the City of Collegedale, the

. City of East Ridge; the Town of Lakesite; the Town of Lookout S

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Mountains the City of Red Banks the Town of Signal Mountains the .

City of Soddy-Daisy; the Town of Walden; the Volunteer Army Ammuni-4 tien Plant (U. S. Military Reservation); Harrison Bay State Parks and Booker T. Washington State Park. The area of study is shown on .

e the Vicinity Map (Figure 1).

Streams studied by detailed methods include the entire lengths of .

the Tennessee River, and Sale Creek within Hamilton County and por-tions of Possum Creek, Rock Creek, Chesnutt Creek upstream of the a

City of Collegedale, North Chickamauga Creek between the cities of Chattanooga and Soddy-Daisy, Lookout Creek adjacent to and upstream of the Town of Lookout Mountain, Soddy Creek downstream of Soddy-Daisy, Wilkerson Branch upstream of Collegedale, and Wolftever Creek both upstream and downstream of Collegedale. A portion of Wolftever Creek upstream of Collegedale was studied by approxinate methods due to the minimal development potential.

The streams studied by detailed methods were selected with priority given to all known flood hazard areas, areas of projected develop-ment, and areas of proposed construction through October 1978.

4 Approxinate methods of analyses were used to study those areas having low development potential and/or minimal flood hazards, as identified at the initiation of the study. The scope and methods of .

study were proposed to and agreed upon by the FIA.

2.2 Community Description 1

/

Hamilton County, located in the southeastern portion of Tennessee, e is bordered on the north by Rhea and Meigs Counties, on the east by Bradley County, on the west by Bledsoe, Marion, and Sequatchie Counties, and on the south by the State of Georgia. The major city in the county is Chattanooga, one of the large trade and industrial centers in the southeast.

The population of Hamilton County has been increasing steadily over the past several decades with a 1970 census recording 255,077 resi-dents (Reference 1). Since the annexation of parts of Hamilton Connty to the City of Chattanooga in 1974, the growth rate has .

slowed from seven percent to four percent, but is again on the rise.

l Flood plain development is primarily residential in nature with many

of the streams studied by detailed methods, posing a considerable flood hazard.

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' .1 Principal Plood Problems The primary flood problem in the valleys of the streams within Hamilton County results from backwater flooding from the Tennessee F;ver. All of the communities exc:cpt Mile Straight have been af-tecte.1 by large river floods in the past. Mile Straight is upstream from the limits of backwater flooding and in its brief history has not yet experienced a serious headwater flood.
The greatest flood in more than 140 years occurred March 11, 1867, on the Tennessee River. Beginning in 1936, regulation by TVA proj-
' ects upstream from Chattanooga has substantially reduced the height and frequency of Tennessee River floods and the resulting backwater flooding up its tributaries. Plood control storage dams constructed between 1936 and 1952 would reduce a recurrence of the 1867 flood by about 18 feet. The great storm of February 1957, which would have ;
produced a flood crest only 4 feet below that of the 1867 flood, was lowered about 22 feet by this regulation. The March 1973 flood would have been almost as great as the 1957 flood and was regulated l to a crest about 16 feet below the natural crest stage.
The greatest headwater flood on North Chickamauga Creek in more than 100 years occurred near Mile Straight on June 29, 1928. There was little development at that time and the flood affected crops only, Other large headwater floods occurred in December 1942, with a crest discharge of 12,000 cubic feet per. second (cfs), January 1946 with a discharge of 12,700 cfs, and January 1949 with a discharge of 14,800 cfs. These floods were about 18 feet above banktops near Hixson.
The January 1949 flood was from two to five feet lower than the 1928 flood in the upper portion of the creek covered by this report. The qreatest flooding occurred in March 1973 on the lower 13 miles of the creek as a result of Tennessee River backwater which blocked Old
!!ixson Pike, Lower Mill Road, and Boy Scout Road. Portions of the liixson and llamillville communities were inundated while about 20 homes were flooded, some to depths of three to four feet.
Wolftever Creek, a tributary to the Tennessee River, flows into the Chickamauga Reservoir from the southeast. Above its mouth in Har-rison Bay State Park, the creek flows through rural areas where only roads, bridges, and one community are affected by flooding. Exten-
- sive damage due to flooding does not take place until the stream nears the City of Collegedale where flood plain development becomes heavier. During the flood of March 1973, Wolf tever Creek rose so high in the vicinity of Collegedale that the mayor proclaimed a
- state of emergency. Water flooded the City liall and the Tri-commu-nities Fire Department to a depth of 2.3 feet. The sewage treatment 4
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2 plant was 'also flooded, and water reached a depth of 1.6 feet on the ,
control room floor. Disruptions to transportation routes also oc-
~~curred on Tallant Road, Tucker Road, and Apison Pike due to inunda-tion as well as the railroad that passes through the city which sus- ,~~
~~tained damage due to undermining of the trac'k bed.~~
~~Possum Creek, also a tributary to the Tennessee River, is in back-~~
~~water from the river for about one-half .its length covered in this~~
] report. Near the Bakewell community there are two principal chan- '
nels for the creek, but the banks are low; and, when these banks are overtopped, water spreads out through the community and follows a number of channels to Chickamauga Lake. A 100-year flood on Possum
~~Creek would produce flood levels that would cause considerable dam-1 age to residences in Bakewell, i~~
I j Sale Creek is subject to backwater flooding from the Tennessee River
. up to the mouth of Rock Creek. Much of the development in the Sale Creek community is in the Rock Creek flood plain. Little develop-4 ment has taken place in the Chickamauga Lake flood plain, i
] A 100-year flood on Rock and Sale Creeks would cause residential ,
~~damage in the Sale creek community, and a maximum probable flood~~
, would increase the levels to about 8 feet above a 100-year flood. i Such flooding wpuld cause considerable residential damage in the .
Rock and Sale Creek flood plains.
a Minor floods in the area of Sale, Rock, and Possum Creeks exceed bankfull stage about twice a year. Major floods have occurred in l
1875, 1886, 1942, 1946, 1948, 1949, 1963, 1969, and 1972, with the 1972 flood producing a discharge of 5,400 cfs, 3,200 cfs, and 5,500 j cfs on Rock Creek, Sale Creek, and Possum Creek, respectively.
?
Chesnutt Creek and Wilkerson Branch are tributary to Wolf tever Creek i within the corporate area of Collegedale. Except for roads crossing the streams, there is little development in the two flood plains. A l 100-year flood would be about 3 feet higher than the record 1971 flood and would surround a few homes in the vicinity of East Brain-erd Road.
~~Soddy Creek is a tributary to the Tennessee River and is in back-i water from the river for the entire reach covered by this report. . .~~
Regulation by upstream TVA reservoirs protects the area from all but '
the most extreme floods. Even these will not cause much damage since most of the development lies above the 500-year flood.
, -5 1
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. , - , , . y ... e, n 3 --, , 7- .
. = - _ - - .- - ___ __ -
t Lookout Creek experienced its highest flood in 1867. The backwater exceeded banktops by more than 15 feet along the stretch of stream ;
covered by this report and was greater than any headwater flood known to have occurred along the creek. Other floods experienced by this area include the floods of January 1946, February 1957, and March 1973. Flood damage due to backwater flooding during a recur-rence of 1867 flood would be limited largely to residences in the low areas of Tiftonia due to TVA stream regulation projects. Back-
water from a maximum probable flood would flood numerous businesses and residences along Lee Highway, the L&N Railroad freight yard, and several miles of railroad tracks near the lower end of Lookout Creek in the vicinity of Tiftonia.
2.4 Flood Protection Measures j The Tennessce River discharges have been altered progressively by
(
construction of upstream dams beginning in 1936 with the closure of Horris Dam until reaching essentially today's level of regulation with the closure of Fontana Dam in late 1944. These flood control storage dams and other instituted TVA regulatory projects have sub- l stantially reduced the height and frequency of Tennessee River f'oods l and resultant backwater flooding to tributaries. Flood con-trol storage dams constructed on the Tennessee River and its tribu- ,
taries since 1936 would reduce the crest of a recurrence of the 1867 flood by about 18 feet, i
3.0 ENGINEERING METHODS For the flooding sources studied in detail in the community, standard hydrologic and hydraulic study methods were used to determine the flood i hazard data required for this study. Floods having recurrence intervals of 10, 50, 100, and 500 years have been selected as having special sig-nificance for flood plain management and for flood insurance premium rates. The analyses reported here reflect current conditions in the watersheds of the flooding sources.
3.1 Hydrologic Analyses l Hydrologic analyses were carried out to establish the peak dis-I
~~charge-frequency relationships for floods of the selected recurrence intervals for each flooding source studied in detail in Hamilton County.~~
Flood-frequency curves were defined as required on 11 streams and the Tennessee River within the county. When stream gage records f
l 6 i
I l
were available, the 100-year discharge was determined from a statis-tical analysis of those records using the log-Pearson Type III pro-
' cedure with adjustments dictated Ly historic flood records developed from newspaper and other records, and computed maximum flood flows .
l (Reference 2). Tennessee River flows were adjusted to reflect flows expected with current levels of regulation by TVA reservoirs.
1 Extrapolation of the frequency curves to the 500-year flood was .
guided by historic flood data, maximum flood flows estimated from rainfalls determined for TVA Dy the National Weather Service, and unit hydrographs and rainfall-runoff relationships. Peak discharge-q drainage area relationships with watersheds that are partially ur-
) banize'd were modified as outlined by the Water Resources Council *
< * (Reference 2). All determinations were compared with those devel-oped by the U. S. Geologico'. Survey (USGS) in 1964 and found to be in complete agreement (Reference 3). Flood-frequency curves at un-I gaged locations were developed by comparison with records at gage
~~locations on nearby streans and other similar watersheds in the I region.~~
1 Peak discharges for the 10 , 50 ,100 , and 500-year floods of streams on the study area and maximum known peak discharges for nearby streams are shown in the " Summary of Discharges" (Table 1).
s .
TABLE 1 -
~~SUMMARY~~
OF DISCHARGES I DRAINAGE AREA PEAK DISCHARGES (cfs) -
FLOODING SOURCE AND LOCATION (sq. miles) 10-YEAR 50-YEAR 100-YEAR 500-YEAR TEUNESSEE RIVER 21,700 190,000 230,000 250,000 310,000 At mile 451.6 ,,
At mile 471.0 20,790 185,000 225,000 245,000 305,000 i POSSUM CREEK At nile 5.43 24.2 5,450 7,340 9,200 14,550 g
At mile 6.35 16.5 4,500 6,000 7,500 12,300 At mile 8.40 16.0 4,200 5,600 7,000 11,500 f
SALE CREEK 10,300 13,800 17,500 25,350 l At mile 4.15 64.1 57.0 9,600 12,800 16,000 23,700 At mile 8.35
~~I l~~
ROCK CREEK 38.3 7,400 9,800 12,300 l'8,800 At mile 0 37.4 9,670 12,000 18,450 At mile 2.42 7,300
}
i 7
f
TABLE 1 -
~~SUMMARY~~
OF DISCHARGES - continued DRAINAGE AREA PEAK DISCHARGES (cfs)
FLOODING SOURCE AND LOCATION (sq. miles) lO-YEAR 50-YEAR 100-YEAR 500-YEAR WOLFTEVER CREEK
, At mile 7.17 44.8 5,020 7,440 8,300 11,600 At mile 12.35 37.0 4,460 6,660 7,450 10,850 At mile 16.10 18.8 2,700 4,200 4,900 10,200 At mile 19.8 6.6 't,400 2,100 2,500 6,100 CilESNUTT CREEK i . At mile 0.55 4.95 1,180 1,830 2,180 5,400 At mile 2.80 1.60 630 900 1,100 3,050 LOOKOUT CREEK At mou'th 187.0 15,000 18,000 20,500 30,700 At mile 5.02 172.0 14,200 17,200 19,400 29,100 WILKERSON BRANCil At mile 1.26 2.0 700 1,060 1,300 3,600 e
At mile 1.75 1.6 600 900 1,100 3,100 NORTH CllICKAMAUGA CREER*
At mile 9.9 108.0 13,500 20,400 23,400 29,300
, At mile 16.40 74.0 15,500 22,800 27,000 34,000 At lile 18.40 61.9 18,000 25,000 28,000 36,400
~~Downstream decreases in peak discharges owing to channel storage.~~
3.2 liydraulic Analyses Analyses of the hydraulic characteristics of the flooding sources studied in detail in the community were carried out to provide esti-mates of the elevations of floods of the selected recurrence inter-vals along each of these flooding sources.
Water-surface elevations of floods for the selected recurrence in-tervals on all streams except the Tennessee River and Soddy Creek were computed through the use of a step-backwater method computer program developed by the TVA, similar to, but with some alterations to the COE HEC-2 backwater program (Re ference 4) . Stream cross sections for the backwater analyses were field surveyed and located at bridges and other strategic locations at sufficiently close in-tervals to accurately compute water-surface elevations. Locations of selected cross sections used in the hydraulic analyses are shown on the Flood Profiles (Exhibit 1). For stream segments for which a floodway is computed (Section 4.2), selected cross-section locations are also shown on the Flood Boundary and Floodway Map (Exhibit 3).
I e
8
. . . - - - - . . _ - -- . . . - - -._ - .. ~ - . - --. - = _ _ . - - . - - - - - - . . - - .
I ,
1 j
Due to the lacustrine nature of the Tennessee River, no cross sec-3
- tions were determined. Selected recurrence interval water-surface j . profiles were obtained from a statistical analysis of elevation data, ,
l and drawn from TVA flood records (Reference 5), field observation, 4
! and high water marks of previous floods.
The portion. of Soddy Creek studied in detail is af fected entirely by l
the normal pool elevation of Chickamauga Lake on the Tennessee River.
Since all flood elevations of Soddy Creek are identical to those of .
! the lake, no profiles are shown. For the selected water-surface ele-vations af fecting this creek, refer to the Tennessee River profile.
Starting water-surface elevations for Lookout Creek, North Chicke-j mauga Creek, Wolftever Creek, Possum Creek, and Sale Creek were based on assumed coincidence of flow with the Tennessee River. Starting water-surface elevations for Rock Creek, Chesnutt Creek, and Wilkerson f Branch were taken as the calculated flood elevations at the mouth of i cach stream.-
\
l Channel roughness factors (Manning's "n") for these streams were as-i signed on the basis of field inspection and TVA records of flood plain and stream bed surfaces The "n" values for each stream are tabulated below.
RANGE OF MANNING"S "n" l
4 Stream Channel Overbank j Possum Creek 0.031-0.100 0.057-0.269 i Sale Creek 0.011-0.061 0.060-0.172 Rock Creek 0.037-0.068 0.083-0.200 Wolftever Creek O.026-0.094 0.100-0.150 Chesnutt Creek 0.038-0.067 0.090-0.150 [
Lookout Creek 0.050-0.071 0.065-0.150 Wilkerson Branch 0.025-0.033 0.046-0.065 .
North Chickamauga Creek 0.020-0.066 0.064-0.200 The final flood profiles were drawn showing computed water-surface elevations to an accuracy-of 0.5 foot for floods of the selected recurrence intervals. Locations of the elevation reference marks
used,in this study are shown on the maps. All elevations are ref-erenced to the National. Geodetic Vertical Datum of 1929 (NGVD), for- l l merly referred to as Sea Level Datum of 1929. .
The hydraulic analyses for this study are based only on the effects
of unobstr4 *.ed flow. The flood elevations as shown on tbn profiles are thus considered valid only if hydraulic structures in general -
! remain unobstructed and do not fail. ,
j 9 II
?
4.0 FIDOD PLAIN fGNAGEMENT APPLICATIONS A primo purpose of the National Flood Insurance Program is to cncourage state and local governments to adopt sound flood plain management pro-grams. Each Flood Insurance Study, therefore, includes a flood boundary map deniqned to assist communities in developing sound flood plain man-agement measures.
4.1 Flood Boundaries in order to provide a national standard without regional discrimi-nation, the 100-year flood has been adopted by the FIA as the base flood for purposes of flood plain management measures. The 500-year flood is employed to indicate additional areas of flood risk in the community. For each stream studied in detail, the boundaries of the 100- and 500-year floods have been delineated using the flood eleva- I tions determined at each cross section; between cross sections, the boundaries were interpolated using topographic maps enlarged to a scale of 1"=500' with a contour interval of 20 feet (Reference 6).
' In cases where the 100- and the 500-year flood boundaries are close together, only the 100-year boundary has been shown.
For the stream studied by approximate methods, the boundaries of the 100-year flood were developed by field investigation, sound engi-neering judgment, and standard 7.5 minute USGS quadrangles (Refer-
. ence 6).
The boundaries of the 100- and 500-year floods are shown on the Flood Boundary and Floodway Map (Exhibit 3). Small areas within the flood boundaries may lie above the flood elevations, and therefore, may not be subject to flooding. Owing to limitations of the map scale or lack of detailed topographic data, such areas are not shown.
4.2 Floodways Encroachment on flood plains, such as artificial fill, reduces the flood-carrying capacity, increases the flood heights of streams, and increases flood hazards in areas beyond the encroachment itself.
One aspect of flood plain managenent involves balancing the economic gain from flood plain development against the resulting increase in flood hazard. For purposes of the Flood Insurance Program, the con-cept of a floodway is used as a tool to assist local communities in this aspect of flood plain management. Under this concept, the area
~
of the 100-year flood is divided into a floodway and a floodway 10
9 fringe. The floodway is the channel of a stream plus any adjacent flood plain areas that must be kept free of encroachment in order that the 100-year flood may be carried without substantial increases ,
in flood heights. Minimum standards of the FIA limit such increases in flood heights to 1.0 foot, provided that hazardous velocities are not produced. The floodways in this report are presented to local ,
agencies as minimum standards that can be adopted or that can be used as a. basis for additional studies.
The adopted 100-year floodways shown in this study were computed by setting encroachments in the stream overbanks, testing these with '
the backwater program, and adjusting and retesting them until an allowable increase in flood elevation is reached. The procedure has been used by TVA for many years to provide technical flood plain management assistance to Tennessee Valley communities. In this pro-cedure the floodway limit lines are located to allow use of some i
presently flood-prone areas at the expense of some increase in flood levels. The limit lines are located in a manner which provides land where it is estimated to serve the community's needs best. The re-sults of these computations are tabulated at selected cross sections for each stream segment for which a floodway is computed (Table 2).
Floodway calculations for those areas of Sale Creek and Wolftever Creek located within the Chickamauga Reservation were not performed ,
l since potential development in these regions is not feasible.
As shown on the Flood Boundary and Floodway Map (Exhibit 3), the ,
floodway widths were determined at cross sections; between cross sections, the boundaries were interpolated. In cases where the boundaries of the floodway and the 100-yea'r flood are either close together or collinear, only the floodway boundary has been shown.
The area between the floodway and the boundary of the 300-year flood is termed the floodway fringe. The floodway f ringe thus encompasses
)
the portion of the flood plain that could be completely obstructed without increasing the water-surface elevation of the 100-year flood more than 3.0 foot at any point. Typical relationships between the floodway and the floodway fringe and their significance to flood plain development are shown in Figure 2.
5.0 INUURANCE APPLICATION In order to establish actuarial insurance rates, s.n Fifs has developed a-process to transfo.-= the date from the engine ?4 r.c .tudy into f]ood
, . - .- m. ,a , _
e m.- --
F LOOD6NG SOURCE FLOODWAY WATER SU ACE LEVATION WIDTH SECTION MEAN WITH WITHOUT DIF F ERE NCE CRO3S SECTION DISTANCE 1 AREA V E LOCITY FLOODWAY FLOODWAY (F T.)
i (F T.) (SO FT.) ( F .P.S. ) (NGVD) (N GV D) i Possum Creek ,
A 4.60 300 2,091 4.4 688.0 687.5 0.5 i l
B 5.43 160 1,885 4.8 698.8 698.3 0.5 C 5.70 325 4,425 2.0 700.3 700.0 0.3 D 6.00 1,200 12,275 0.7 701.6 700.9 0.7 E 6.35 1,200 12,255 1.2 70s.O 701.2 0.8 F 6.65 I 1,200 6,975 1.1 708.5 708.1 0.4 t
G 6.80 1,650 4,360 1.7 715.8 715.3 0.5
,f H 7.04 j 2,040 2,735 2.7 732.0 731.0 1.0 l I 7.41 5 1,250 745 9.6 764.4 763.7 0.7 !
J 7.80 1,270 10,515 0.7 805.4 805.4 0.0 K 8.10 180 550 12.7 830.0 830.0 0.0 ,
e i Sale Creek 220 3,240 5.4 689.5 689.0 0.5 l A 4.15 B 4.35 350 2,165 8.1 689.7 689.2 0.5 C 4.53 170 1,755 10.0 690.2 689.8 ,0.4 D 5.00 430 4,295 4.0 693.5 693.3 0.2 E 5.34 370 3,990 4.3 694.1 694.1 0.0 1 F 5.65 380 4,800 3.6 696.6 696.3 0.3 '
t IMILES ABOVE MOUTH DEPARTMENT OF HOUSING AND URBAN DEVELOPMENT 1
7 Federillmurance Administration FLOODWAY DATA
=
A HAMILTON COUNTY, TN
" P0SSUM CREEK AND SALE CREEK
[ UNINCORPORATED AREAS) l
E 1
t ,
F LOODING SOURCE FLOODWAY WATER SU AC LEVATION ->
DIFF NCE CROSS SECTION DISTANCE I ) A E VELO TY FLOO AY F ODWAY (SO. FT ) ( F .P.S.) (NGVD) (NGVD) k !
Sale Creek (continued) '
675 8,400 698.4 698.0 0.4 j G C.00 2.0 H 6.47 960 11,145 1.5 699.7 699.0 0.7 t I 6.8f 670 5,970 2.8 701.1 700.4 0.7 f J 7.29 610 4,735 3.4 702.2 701.4 0.8 j K 7.73 500 3,010 5.3 703.9 703.4 0.5 L 8.07 320 2,680 6.0 709.0 708.7 0.3 i Rock Creek A 0.30 315 1,815 6.7 693.6 693.1 0.5 B 0.60 565 2,035 6.0 708.2 708.1 0.1 C 0.91 450 1,560 7.8 720.6 720.0 0.6 D 1.16 700 4,685 2.6 738.5 737.6 0.9 j E 1.40 400 1,555 7.8 750.8 750.6 0.2 P 1.73 300 2,100 5.7 772.5 772.5 0.0 G 2.10 470 1,300 9.3 796.9 796.9 0.0 H 2.42 380 2,505 4.8 821.0 820.0 1.0 I
I MILES ABOVE MOUTH I
_ _l DEPARTMENT OF HOUSING AND URBAN DEVELOPMENT
=
Fede.allnsurance Administration FLOODWAY DATA
~
A HAMILTON COUNTY, TN
" ~'
(UNINCORPORATED AREAS)
SALE CREEK AND ROCK CREEK
. . . . _ - . - . . _ - . . . . - - . - . - . - . _ ._. - - - - - ~-
F LOODING SOURCE FLOODWAY WATER SU FAC LEVATION
" DIFF NCE CROSS SECTION DISTANCEI y3 A E VE OC TY FLO AY F L ODWAY (SQ. F T.) ( F .P.S.) (NGVD) (NGVD)
Wolftever Creek A 7.17 200 2,470 3.4 689.7 689.3 0.4 B 7.45 220 2,390 3.5 691.5 690.6 0.9 C 8.05 150 1,475 5.3 695.4 694.4 1.0 D 8.50 150 1,375 5.3 697.9 697.2 0.7 E 8.98 155 1,495 5.2 701.6 701.2 0.4 F 9.47 270 3,520 2.2 705.3 704.8 0.5 G 9.88 200 1,610 4.8 708.4 708.0 0.4 H 10.35 220 1,560 4.9 711.8 711.5 0.3 I 10.70 180 1,810 4.2 716.3 716.0 0.3 J 10.84 125 1,510 5.0 719.3 718.3 1.0 K 11.19 160 1,520 5.0 722.1 721.4 0.7 L 11.54 590 3,355 2.2 724.9 724.3 0.6 M 11.99 115 1,320 5.7 727.6 726.9 0.7 N 12.35 210 1,755 4.? 732.3 731.7 0.6 O 12.72 230 1,840 4.0 736.6 736.0 0.6 j P 13.20 310 2,145 3.4 740.1 739.2 0.9 Q 13.55 590 2,840 2.6 742.6 741.6 1.0 R 13.83 350 1,875 3.9 744.7 744.0 0.7
! S 13.87 300 2,455 3.0 747.0 747.c 0.0 IMILES ABOVE MOUTH i i
! l
! i
~~-
DEPARTMENT OF HOUSING AND URBAN DEVELOPMENT I W
Federellnsurance Administration FLOODWAY DATA E HAMILTON COUNTY, TN ~
(UNINCORPORATED AREAS)
WOLbEVERCREEK I
l l
-- ~_. ---
FLOODING SOURCE FLOODWAY WATE R AC LEVATION
" DIFF NCE DISTANCE 1 AR A ifELO TY FLO AY F ODWAY CROSS SECTION 3
( F.P.S.) (NGVD) (NGVOI (SQ. FT.)
Wolftever Creek (continued) 748.1 0.6 14.15 205 1,810 4.0 748.7 T
890 6.4 752.9 752.4 0.5 U 14.70 100 4,910 1.2 756.9 756.7 0.2 V 15.03 600 1.5 759.5 758.9 0.6 W 15.70 9002 3,140 l
17.18 1102 900 5.5 784.7 784.3 0.4 X
1102 970 4.5 785.3 785.2 0.1 Y 17.30 1,030 2.7 795.9 795.6 0.3 Z 18.70 200 Chesnutt Creek A 2.00 425 1,100 1.5 817.5 ' 8'.6.9 0.6 2.40 400 785 1.7 823.5 823.3 0.2 B
2.30 295 720 1.5 831.C 830.8 1.0 C
Lookout Creek 0.5 4002 *
651.5 651.0 A 0.67 5002 *
653.1 652.6 0.5 B 1.24 500 2 *
~~657.0 656.5 0.5 C 3.50 i IMILES ABOVE MOUTH 2THIS WIDTH EXTENDS BEYOND THE CORPORATE LIMITS~~
' VALUES NOT DETERMINED-AREA WITHIN NICKAJACK LAKE BACKWATER DEPARTMENT OF HOUSING AND URBAN DEVELOPMENT
~ r 4- ii < ac ad -i itr ti - FLOODWAY DATA . ..
E '
A HAMILTON COUNTY, TN WDLFTEVER CREEK, CHESNUTT CREEK, AND LOOK0UT CREEK
" (UNINCORPORATED AREAS)
J
s . . . . .
I i
i F LOODW AY WATER SU AC LEVATION FLOODING SOURCE A EA VEL C TY FLO AY F 00 WAY gh '
CROSS SECTION DISTANCE 1 y (F.P.S.) (NGVD) (NGVD)
(SO. FT.)
Iookout Creek (continued) 1.4 659.1 658.1 1.0 4.50 875 14,065 D
760 12,740 1.5 659.4 658.4 1.0 E 5.02 Wilkerson Branch 824.9 824.4 0.5 1.26 150 280 4.6 A
150 250 4.8 831.4 830.7 0.7 B 1.47 125 185 6.0 842.2 842.1 0.1 C 1.75 North Chickamauga Creek 671.7 670.7 1.0 10.80 1,700 24,765 0.9 A 1.0 '
1,400 18,265 1.3 672.6 671.6 B 12.20 8,790 2.6 673.6 672.7 0.9 C 12.82 590 1,600 17,625 1.5 676.2 675.4 0.8 ;
D 14.35 I 1,925 20,875 1.3 677.7 676.7 1.0 5 E 14.99 0.8 16.00 1,820 14,535 1.9 681.1 680.3 F
IMILES ABOVE MOUTH DEPARTMENT OF HOUSING AND URBAN DEVELOPMENT r .ii i r. c. ad-i isir.ti.- FLOODWAY DATA i
=
' E HAMILTON COUNTY, TN
~
LOOK0UT CREEK, WILKERSON BRANCH,AND NORTH CHICKAMAUGA CREEK
" (UNINCORPORATED AREAS)
~~100 Y E AR F LOOD PL AIN - -~~
F LOODW A V : +
% - : FLOODWAY F RING E F RINGE STR E AM CHANNEL .
7 LOOD E LEV AflON WHEN
~~CONFINED WITHIN F LOODW AV ENCROACHMENT ENCROACHMENT~~
$URCHARGE'--
,q ,
~ . -
m.
\ j
.x -
ARE A OF FLOOD PL AIN THAT COULD FLOOD E LEVATION BE USED FOR DEVE LOPMENT By BEFORE ENCROACHMENT R AlslNG GROUND ON FLOOD PLAIN LINE A B 15 THE FLOOD ELEV ATION 8EFORE ENCROACHMENT LINE C 0 IS THE FLOOD ELEVATION AFTER ENCROACHMENT ,
' SURCHARGE NOT TO E XCEED 10 FOOT (FIA REQUIREMEN O OR LESSER AMOUNT IF SPECIFIED BY STATE. e s
FLOODWAY SCHEMATIC Figure 2
}
insurance criteria. This process includes the determination of reaches, j Flood Hazard Factors (FHFs), and flood insurance zone designations for each flooding source affecting Hamilton County.
)
5.1 Reach Determinations Reaches are defined as lengths of watercourses having relatively the same flood hazard, based on the average weighted difference in water-surface elevations between the 10- and LOO-year floods. This difference does not have a variation greater than that indicated in -
the following table for more than 20 percent of the reach.
Average Difference Between
~~Variation~~
_10- and 100-Year Floods Less than 2 feet 0.5 foot 2 to 7 feet 1.0 foot .
17 1
i Nineteen reaches meeting the above criteria were required for the flooding sources of Hamilton County. These include three for the Tennessee River, two for Possum Creek, three for Sale Creek, two for Rock Creek, four for Wolf tever Creek, one each for Chesnutt Creek, Lookout Creek, and Wilkerson Branch, and two for North Chick-
. amauga Creek. The locations of the reaches are shown on the Flood Profiles (Exhibit 1).
5.2 Flood Hazard Factors The FHF is the FIA device used to correlate flood information with insurance rate tables. Correlations between property damages from floods and their FHFs are used to set actuarial insurance premium rate tables based on FHFs from 005 to 200.
The FHF for a reach is the average weighted differen e between the -
l -
10- and 100-year flood water-surface elevations expressed to the nearest one-half foot, and shown as a three-digit code. For example, j . if the dif ference between water-surface elevations of the 10- and 100-year floods is 0.7 foot, the FHF is 005; if the difference is
1. 4 feet, the FHP is 015; if the difference is 5.0 feet, the FHF is 050. When the dif ference between the 10- and 100-year flood water-surf ace elevations is greater than 10.0 feet, accuracy for the FHF
~
is to the nearest foot.
f 5.3 Flood Insurance Zones Af ter the determination cf reaches and their respective FHFs, the entire unincorporated area of Hamilton County was divided into zones, each having a specific flood potential or hazard. Each zone was assigned one of the following flood insurance zone designations:
Zone A: Special Flood Hazard Areas inundated by the 100-year flood, determined by approximate 4 methods; no base flood elevations shown or FHFs determined.
Zones Al, A2, A3, A4, Special Flood Hazard Areas inundated by the AS, A6, A7, A8, 100-year flood, determined by detailed and A9: methods; base flood elevations shown, and zones assigned according to FHFs.
Zone B: Areas between the Special Flood Hazard Area and the limits of the 500-year flood, in-cluding areas of the 500-year flood plain j that are protected from the 100-year flood by dike, levee, or other water control 18 J
- - ,--y. y- ,-w~ w v .. --,w y- - _ , , - . . . , - + - + -- ----
structure; also areas subject to certain types of 100-year shallow flooding where depths are less than 1.C, foot; and areas ,
subject to 100-year flooding from sources with drainage areas less than 1 square mile. Zone B is not sul a t i v i ded . .
7one C: Areas of minimal flooding; including areas that are protected from 100- and 500-year floods by dike, levee, or other water con-trol structure; not subdivided. .
Zone D: Area of undetermined, but possible flood hazard.
Table 3, " Flood Insurance Zonc Data," summarizes the flood elevation differences, FilFs , flood insurance zones and base flood elevations for each flooding source studied in detail in llamilton County.
5.4 Flood Insurance Rate Map Description The Flood Insurance Rate Map for llamilton County is, for insurance purposes, the principal result of the Flood Insurance Study. This .
map (published separately) contains the official delineation of flood insurance zones and base flood elevation lines. Base flood elevation lines show th locations of the expected whoic-foot water-surface elevations of the base (100-year) flood. This map is devel-oped in accordance with the latest flood insurance map preparation guidleines published by the FIA.
6.0 OTHER STUDIES Beginning in 1958, se'cral reports concerning flooding of major streams were published on areas within llamilton County (References 7 through 11).
These reports, prepared by the study contractor, served as useful infor-mation in determining hydrologic and hydraulic data for this Flood Insur-ance Study.
Other Flood Insurance Studies contiquous to the llamil ton County study in-
clude the City of Chattanooga, Tennessee, the City of Red Bank, Tennes-see, the City of Collegedale, Tennessee, the City of Soddy-Daisy, Tennes-see, the Town of Lookout Mountain, Tennessee, the City of East Ridge, Tennessee, and Walker County, Georgia (References 12 through 19, re- '
spectively). Each of these studies either is or will be in agreement with this study upon completion.
19
ELEV ATION OlFFERENCE2 BETWEEN 1% (100-YE AR) AND BASE FI 000 F LOODING SOURCE PANEL I FHF ZONE ELEVATION 3 UI (10 YR ) , (50 YR.) (500 YR.)
l Wolftever Creek Reach 1 225 -2.2 -0.8 +1.8 020 A4 Varies Reach 2 225 -2.9 -0.8 +4.6 030 A6 Varies Reach 3 225 -2.3 -1.2 +2.4 025 A5 Varies Reach 4 225 -1.9 -0.7 +2.0 020 A4 Varies
, Chesnutt Creek i Reach 1 225 -0.9 -0.2 +1.0 010 A2 Varies Lookout Creek l
, Reach 1 25 -3.1 -1.3 +4.5 030 A6 Varies l
l Wilkerson Branch Reach 1 225 -0.7 -0.1 +0.7 005 Al Varies j
! i j North Chickamauga Creek l' 045 A9 Varies Reach 1 125 -4.7 -1.5 +2.3 '
Reach 2 125 -4.1 -1.4 +1.9 040 A8 Varies l
i IFLOOD INSURANCE RATE MAP PANEL !
2WElGHTED AVERAGE 3 ROUNDED TO THE NEAREST FOOT-SEE MAP ;
DEPARTMENT OF HOUSING AND URBAN DEVELOPMENT g reder iias .ac. Admiaistratioa Fl.00D INSURANCE ZONE DATA
=
A HAMILTON COUNTY, TN WOLFTEVER CREEK, CHESNUTT CREEK, LOOK0UT CREEK,
~~WILKERSON BRANCH AND NORTH CHICKAMAUGA CREEK~~
[ UNINCORPORATED AREAS)
i-5 lt K
E D E ON R s s s s s s s s s s s C O
LIO )D e e e e e eeee e e F TV iii ii ii ii ii N .
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\
S i This study is authoritative for_ purposes of the Flood Insurance Program ,
and the data presented here either supersede or are compatible with pre-
. vious determinations.
1 f
i - 7.0 LOCATION OF DATA i
~~Survey, hydrologic, hydraulic, and other pertinent data used in this study can be obtained by contacting the office of the Federal Insurance j~~
Administration, 1371 Peachtree Street, N. E., Atlanta, Georgia 30309.
1 8.0 BIBLIOGRAPHY AND REFERENCES 1
J
~~l. U. S. Department of Commerce, Bureau of the Census, 1970 Census of Population, Number of Inhabitants, Tennesseo, Washington, D. C.,~~
l 1971.
I
~~2. U. S. Water Resources Council, " Guidelines for Determining Flood l~~
Flow Frequencies," Bulletin 17, Washington, D. C., March 1973.
I
~~3. U. S. Department of the Interior, Geological Survey, Aagnitude and j ~ Frequency of Floods in the United States, Water Supply Paper No.~~
~~I 1676, Washington, D. C., 1964.~~
~~4. Tennessee Valley Authority, Computer Center, Step Method Backwater Computer Program 011-SP SA 321-099, Chattanooga, Tennessee, 1973.~~
s
~~5. Tennessee Valley Authority, Division of Water Control Planning,'~~
~~Daily Discharges at Tennessee Valley Authority Stream Gages in the T,_e_nnessee River Basin, Knoxville, Tennessee.~~
~~6. U. S. Department of the Interior, Geological Survey, 7.5 Minute Series (Topographic) Maps, Scale 1:24,000, Contour Interval 20 feet:~~
Dirchwood, Tennessee, 1967; Brayton, Tennessee, 1972; Chattanooga, Tennessee, 1969; Cohutta, Tennessee-Georgia, 1972; Daisy, Tennes-see, 1969; East Chattanooga, Tennessee, 1969; East Ridge, Tennessee-
' Georgia, 1969; Fairmount, Tennessee, 1968; Fort Oglethorpe, Tennes-
' see-Georgia, 1969; Crasshopper Creek, Tennessee, 1972; Graysville, Tennessee, 1972; Henson Gap, Tennessee, 1946, Photorevised 1966; Hooker, Tennessee-Georgia, 1970; Ketner Gap, Tennessee, 1943, Photo-l revised 1965; Mcdonald, Tennessee, 1967; Ooltewah, Tennessee, 1967; Ringgold, Tennessee-Georgia, 1946, Photorevised 1967; Snow Hill, Tennessee, 1964; Soddy, Tennessee, 1972; Sou'.h Cleveland, Tennessee, i
1965; Wauhatchie, Tennessee, 1970.
22 1
4
= - - - - , - - - , - - - , , - -
--r- -
,-3 - - - - , y
7. Tennessee Valley Authority, Division of Water Control Planning, Floods on the Tennesseei River, Chattanooga and Dry Creeks, and Stringer 5 Branch, Vicinity of, Chattanooga, Tennessee, Report No. .
~~0-5865, Knoxville, Tennessee, June 1959.~~
~~8. Tennessee Valley Authority, Division of Water Control Planning, -~~
Floods on North Chickamauga, Mountain, and Lookout Creeks, Vicinity
__f_
o Chattanooga, Tennessee, Report No. 0-5977, Knoxville, Tennessee, ,
May 1966.
~~9. Tennessee Vatlev '.uthority, Division of Water Control Planning, ,~~
~~Floods en South Chickamauga, West Chickamauga, and Spring Creeks, Vicinity of Chattanooga, Tennessee, Report No. 0-5843, Knoxville, Tennessee, June 1958.~~
10. Tennessee Valley Authority, Division of Water Control Planning, Hydraulic Data Branch, Floods on Wolftever and Chesnutt Creeks in Southeastern Hamilton County, Tennessee, Special Report, Knoxville, Tennessee, July 1972.
11. Tennessee Valley Authority, Division of Water Control Planning, Hydraulic Data Branch, Floods on Soddy and Little Soddy Creeks, Possum Creek, and Sale and Rock Creeks in, Northern Hamilton County, -
~~Tennessee, Special Report, Knoxville, Tennessee, June 1972.~~
~~12. U. S. Department of Housing and Urban Development, Federal Insurance Administration, Flood Insurance Study for the City of Chattanooga, Hamilton County, Tennessee, Washington, D. C., Unpublished.~~
~~13. U. S. Department of Housing and Urban Development, Federal Insurance Administration, Flood Insurance Study for the City of; Red Bank, Hamilton County, Tennessee, Washington, D. C., Unpublished.~~
~~14. U.S. Department of Housing and Urban Development, Federal Insurance Administration, Flood Insurance Study for Collegedale, Hamilton County, Tennessee, Washington, D. C., December 1972.~~
15. U. S. Department of Housing and Urban Development, Federal Insurance A'dministration, Flood Insurance Study for the City of Soddy-Daisv, Hamilton County, Tennessee, Washington, D. C., May 1973. ,
~~16. U. S. Department of Housing and Urban Development, Federal Insurance f~~
Administration, Flood Insurance Study for the Town of Lookout .
I Mountain, Hamilton County, Tennessee, Washington, D. C. , Unpub- ,
lished.
l l
23 l
17. U. S. Department of ..dsing and Urban Development, Federal Insurance Admi nis t ration , Flood Insurance Study for the City of East Ridge, llamilton County, Tennessee, W.ishington, D. C., October 1972.
~~18. U. S. Department of Housing and Urban Development, Federal Insurance Administration, Flood Insurance Study for Walker County, Georgia, Washington, D. C., Unpublished.~~
4 1
O l
1 1
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ML19323E259: Difference between revisions

Revision as of 19:25, 18 February 2020

Contents

Text

1.0 INTRODUCTION

1.0 INTRODUCTION

SUMMARY

SUMMARY

Navigation menu

ML19323E259: Difference between revisions

Revision as of 19:25, 18 February 2020

Text

1.0 INTRODUCTION

1.0 INTRODUCTION

SUMMARY

SUMMARY

Navigation menu

Search