HomeMy WebLinkAbout00071489FLOOD
INSURE
STUDY
-
BRAZOS COUNTY,
TEXAS AND
INCORPORATED AREAS
COMMUNITY
NAME
BRYAN. CITY OF
COLLEGE STATION, CITY OF
WIXON VALLEY, CITY OF
UNINCORPORATED AREAS
COMMUNITY
NUMBER
480082
480083
481636
481195
REVISED: FEBRUARY 9, 2000 3
Federal EmergencyManagey ; gency~ i~ , ,
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CROSS SECTION
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LOCATION
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)VE
CONFLUENCE WI
TH ALUM CREEK
45P
280
27E
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STREAM DISTANCE IN THOUSANDS OF FEET A
TABLE 3 - SUMMARY OF ROUGHNESS COEFFICIENTS
STREAM OVERBANK "n" CHANNEL "n"
Wickson Creek
0.060 -
0.085
0.050 -
0.075
Little Wickson Creek
0.060 -
0.085
0.050 -
0.065
Mathis Creek
0.060 -
0.085
0.050 -
0.065
Carters Creek
0.035 -
0.095
0.014 -
0.065
Bee Creek
0.050 -
0.095
0.035 -
0.065
Bee Creek Tributary A
0.050 -
0.085
0.040 -
0.065
Bee Creek Tributary B
0.050 -
0.095
0.040 -
0.065
Wolf Pen Creek
0.050 -
0.085
0.040 -
0.065
Wolf Pen Creek Tributary A
0.060
- 0.090
0.014 -
0.065
Wolf Pen Creek Tributary B
0.060
- 0.090
0.014 -
0.065
Wolf Pen Creek Tributary C
0.060
- 0.090
0.014 -
0.065
Hudson Creek
0.060
- 0.090
0.014 -
0.065
Burton Creek
0.014
- 0.090
0.014 -
0.080
Burton Creek Tributary C
0.060
- 0.090
0.014 -
0.065
Burton Creek Tributary D
0.015
- 0.090
0.014 -
0.090
Briar Creek
0.060
- 0.090
0.041 -
0.065
Carters Creek Tributary B
0.060
- 0.090
0.041 -
0.065
Lick Creek
0.060
- 0.090
0.050 -
0.070
Alum Creek
0.085
0.060
'Stream AC-1
0.065
- 0.085
0.050
- 0.055
Cottonwood Branch
0.060
- 0.090
0.014
- 0.065
South Fork of Cottonwood
Branch
0.060
- 0.090
0.014
- 0.065
Still Creek
0.060
- 0.090
0.014
- 0.065
Still Creek Tributary A
0.060
- 0.090
0.014
- 0.065
West Fork Still Creek
0.060
- 0.090
0.014
- 0.065
Turkey Creek
0.060
- 0.090
0.014
- 0.065
Thompsons Creek
0.060
- 0.090
0.014
- 0.065
Thompsons Branch
0.060
- 0.090
0.014
- 0.065
Foxfire Creek
0.080
- 0.090
0.065
- 0.075
Spring Creek
0.040
- 0.100
0.015
- 0.060
For this countywide Flood Insurance Study, 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 was computed (Section 4.2), selected cross section
locations are also shown on the Flood Insurance Rate Map
(Exhibit 2).
Flood Profiles were drawn showing computed water-surface elevations
for floods of the selected recurrence intervals.
The hydraulic analyses for this study were based on unobstructed
flow. The flood elevations shown on the profiles are thus
considered valid only if hydraulic structures remain unobstructed,
operate properly, and do no not fail.
19
TABLE 2 -
SUMMARY OF
DISCHARGES
- continued
FLOODING SOURCE DRAINAGE AREA
PEAK DISCHARGES (cfs)
AND LOCATION (sq. miles)
10-YEAR
50-YEAR 100-YEAR
500-YEAR
ALUM CREEK
At confluence with
1
Lick Creek
4.40
*
*
4,500
At confluence of
Stream AC-1
4.00
*
*
5,300
Approximately 500 feet
upstream of Stream
AC-1
3.08
*
*
4,000
Approximately 1.25
{ miles downstream of
State Route 6
2.61
*
*
3,700
Approximately 2,000
feet upstream of
State Route 6
1.84
*
*
3,600
STREAM AC-1
At' confluence with
Alum Creek
0.92
*
*
1,750
Approximately 1.21 miles
upstream of the con-
fluence with Alum Creek
0.54
*
*
1,350
Approximately 1.81 miles
upstream of the con-
fluence with Alum Creek
0.27
*
*
850
COTTONWOOD BRANCH
At confluence with
Still Creek
6.58
3,700
5,500
6,300
8,300
Below confluence of South
Fork of Cottonwood Branch
6.41
3,300
4,900
5,600
7,500
Above confluence of South
Fork of Cottonwood Branch
3.86
2,200
3,260
3,700
4,900
At FM 2818
2.47
2,200
3,260
3,700
4,900
At Palasota Drive
0.56
980
1,340
1,500
1,900
SOUTH FORK OF COTTONWOOD BRANCH
At confluence with
Cottonwood Branch
2.55
1,300
1,930
2,200
2,950
At a point approximately
3.2 miles upstream of
confluence with
Cottonwood Branch
0.85
660
940
1,060
1,370
1Downstream discharge decrease is due
to flatter
weighted stream slopes and
longer stream lengths, resulting in
longer unit
hydrograph
times to
peaks
* and lower discharges.
Data not computed
15
7.0 OTHER STUDIES
The COE completed two studies of the area in December 1973 and December
1975, entitled Flood Plain Information, Carters Creek and Tributaries,
Bryan and College Station, Texas, and Flood Plain Information, Thompsons
Creek and Tributaries, Bryan, Texas (References 6 and 1). These reports
investigated the flooding potential on portions of Carters Creek, Bee
Creek, Wolf Pen Creek, Burton Creek, Briar Creek, Thompsons Creek,
Thompsons Branch, Still Creek, West Fork Still Creek, Cottonwood Branch,
and South Fork of Cottonwood Branch.
Flood Insurance Studies have been prepared for the unincorporated areas
of Madison, Grimes, and Burleson Counties (References 25, 26, and 27).
Because it is based on more up-to-date and detailed analyses, this study
supersedes the Flood Hazard Boundary Map for the unincorporated areas of
Brazos County; and the previously printed Flood Insurance Studies for the
Cities of Bryan and College Station (References 24, 22, and 23).
8.0 LOCATION OF DATA
Information concerning the pertinent data used in the preparation of
this study can be obtained by contacting FEMA, Mitigation Division,
Federal Regional Center, Room 206, 800 North Loop, Denton, Texas 76201-
3698.
9.0 BIBLIOGRAPHY AND REFERENCES
1. U. S. Army Corps of Engineers, Fort Worth District, Flood Plain
Information, Thompsons Creek and Tributaries, Bryan, Texas, December
1975.
2. The Handbook of Texas, Texas State Historical Association, 1952.
3. Texas Almanac, Dallas Morning News, 1986-1987.
4. U. S. Army Corps of Engineers, Fort Worth District, Problem
Identification Study, Brazos River Basin, Texas, September 1987.
5. U. S. Army Corps of Engineers, Fort Worth District, Flood Problems
Identification Study, Brazos River Basin, Texas, December 1987.
6. U. S. Army Corps of
Engineers,
Fort Worth District, Flood Plain
Information, Carter
s Creek and
Tributaries, Bryan and College
Station, Texas, December 1973.
7. U. S. Army Corps of
Engineers,
Fort Worth District, Hydrology
Memorandum, Carters
Creek Flood
Plain Study, 1975.
8. U. S. Army Corps of
Engineers,
Fort Worth District, Special Flood
Hazard Infomation,
Turkey Creek, Bryan, Texas, December 1975.
35
THE
WAL LACE
GROUP,
INC.
E N G I N E E R S
A R C H I T E C T S
P L A N N E R S
S U R V E Y O R S
PEBBLE CREEK, PHASE 9-A - 19.65 ACRES
FIELD NOTES FOR A 19.65 ACRE TRACT OF LAND LOCATED IN THE S.W. ROBERTSON
ev A c o SURVEY, ABSTRACT NO. 202, BRAZOS COUNTY, TEXAS, AND BEING OUT OF THE
T IEL"'1 P L E RESIDUE OF A CALLED 505.19 ACRE TRACT DESCRIBED AS TRACT 1 IN A DEED TO
A S T I N
D A A L L A S PEBBLE CREEK DEVELOPMENT COMPANY, RECORDED IN VOLUME 1671, PAGE 276
OF THE OFFICIAL DEED RECORDS OF BRAZOS COUNTY, TEXAS. SAID 19.65 ACRES
BEING MORE PARTICULARLY SHOWN ON THE ATTACHED PLAT OF WHICH IS MADE
A PART HEREOF AND DESCRIBED BY METES AND BOUNDS AS FOLLOWS:
BEGINNING AT A'/2" DIAMETER REBAR FOUND MARKING THE EAST CORNER OF
LOT 5, BLOCK 33 OF PEBBLE CREEK, PHASE 8-A, RECORDED IN VOLUME 3298, PAGE
- 239 OF SAID DEED RECORDS, MARKING A CORNER OF THE ABOVE MENTIONED
RESIDUE OF THE 505.19 ACRE TRACT AND THE MOST NORTHERLY CORNER OF THE
HEREIN DESCRIBED TRACT;
- THENCE THROUGH THE INTERIOR OF THE RESIDUE OF THE 505.19 ACRE TRACT THE
- FOLLOWING THIRTY ONE (31) COURSES:
Senn Flaherty, R.PL.S.
Kocin He-l, R.P.L.S. 1) S 40-06'10" E - 149.50' TO A 1/2" DIAMETER REBAR PLACED FOR AN ANGLE
Gcorge)eeck,AA.A- POINT,
Mike Kc,ihcy, P.E., R.PLS.
D,,, id a,.rek, PE. 2) S 10°03'26" E - 51.87' TO A 1/2" DIAMETER REBAR PLACED FOR AN ANGLE POINT,
Brian A. M c Daeicl, PE.
Thomas 1. Mireur)r., R.PL.5. 3) S 63~°70T4'22" E - 176.24' TO A E/2" DIAMETER REBAR PLACED FOR AN ANGLE
Dan Nixon, R.PL-S. POI1V 1 ,
).A. 7akr" P.rvlasJr., PE.
S' Posey, R.P.L.S. 4) AN ARC DISTANCE OF 61.83' ALONG A CURVE TO THE RIGHT HAVING A
Lynn Sims,-, R.P.LS. 1
Da,i(l P Sreith, RE. RADIUS OF 225.00' AND WHOSE CHORD BEARS S 34048'00" W - 61.64' TO A /2"
Darrell v" Wa,lkeA.r, I. Jr., A.RE. E . "Jed' Walker, DIAMETER REBAR PLACED FOR AN ANGLE POINT,
George
R.E.'Bo6 W,11-e, RE., R.F.L.S. 5) S 47-19'37" E - 132.84' TO A 1/2" DIAMETER REBAR PLACED FOR AN ANGLE
Ott~, E. 6%,vdcrhold, RE. POINT,
)ohe F. Winkler, P.E.
6) S 49°53'50" W - 20.00' TO A 1/2" DIAMETER REBAR PLACED FOR AN ANGLE
POINT,
7) S 42°35'32" E - 129.67' TO A 1/2" DIAMETER REBAR PLACED FOR AN ANGLE
- POINT,
- 8) AN ARC DISTANCE OF 5.19' ALONG A CURVE TO THE LEFT HAVING A RADIUS
OF 475.00' AND WHOSE CHORD BEARS N 47°05'41" E - 5.19' TO A 1/2" DIAMETER
REBAR PLACED FOR AN ANGLE POINT,
- 9) S 43-13'05" E - 50.00' TO A 1/2" DIAMETER REBAR PLACED FOR AN ANGLE POINT,
10) S 57°04'31" E - 136.37' TO A 1/2" DIAMETER REBAR PLACED FOR AN ANGLE
POINT,
11) S 14°28'42" E - 236.40' TO A 1/2" DIAMETER REBAR PLACED FOR AN ANGLE
- POINT,
12) S 03°06'43" E - 55.78' TO A 1/2" DIAMETER REBAR PLACED FOR AN ANGLE POINT,
13) S 22-37'12" W - 110.31' TO A 1/2" DIAMETER REBAR PLACED FOR AN ANGLE
POINT,
14) S 48°21'07" W - 55.78' TO A 1/2" DIAMETER REBAR PLACED FOR AN ANGLE
POINT,
15) N 33-04'14" W - 137.00' TO A 1/2" DIAMETER REBAR PLACED FOR AN ANGLE
POINT,
16) AN ARC DISTANCE OF 34.86' ALONG A CURVE TO THE RIGHT HAVING A
P.O. Box 22007 RADIUS OF 50.00' AND WHOSE CHORD BEARS S 76°54' 10" W - 34.16' TO A 1/2"
Waco, Texas 76702 DIAMETER REBAR PLACED FOR AN ANGLE POINT,
8225 Central Park Drive
Suite 100
Waco, Texas 76712
(254)772-9272
(300)336-1683
Tax (254) 776-2924
vdw%%.Wallace-grou P.com
17) S 06°52'34" W -
137.00' TO A'/z" DIAMETER REBAR PLACED FOR AN ANGLE
POINT,
18) N 73°50'09" W -
60.39' TO A 1/z" DIAMETER REBAR PLACED FOR AN ANGLE
POINT,
19) N 45°57'23" W -
119.19' TO A 1/2" DIAMETER REBAR PLACED FOR AN ANGLE
POINT,
20) N 06°32'26" W -
59.40' TO A 1/2" DIAMETER REBAR PLACED FOR AN ANGLE
POINT,
21) S 82-20'16" W -
61.74' TO A 1/2" DIAMETER REBAR PLACED FOR AN ANGLE
POINT,
22) S 49°53'50" W -
220.00' TO A 1/2" DIAMETER REBAR PLACED FOR AN ANGLE
POINT,
23) S 23°35'09" W -
135.89' TO A 1/2" DIAMETER REBAR PLACED FOR AN ANGLE
POINT,
24) N 82°01'58" W -
90.00' TO A 1/2" DIAMETER REBAR PLACED FOR AN ANGLE
POINT,
25) S 07°58'02" W -
190.00' TO A 1/2" DIAMETER REBAR PLACED FOR AN ANGLE
POINT,
26) N 82°01'58" W -
10.00' TO A 1/2" DIAMETER REBAR PLACED FOR AN ANGLE
POINT,
27) S 07°58'02" W -
155.73' TO A 1/2" DIAMETER REBAR PLACED FOR AN ANGLE
POINT,
28) S 88°53'26" W -
101.27' TO A 1/2" DIAMETER REBAR PLACED FOR AN ANGLE
POINT,
29) N 82°01'58" W -
60.00' TO A 1/2" DIAMETER REBAR PLACED FOR AN ANGLE
POINT,
30) N 07°58'02" E -
61.70' TO A 1/2" DIAMETER REBAR PLACED FOR AN ANGLE POINT,
31) AND N 82°01'58" W - 136.35' TO A 1/2 DIAMETER PLACED IN THE
SOUTHEASTERLY LINE OF LOT 86, BLOCK 25 OF PEBBLE CREEK, PHASE 8-C,
RECORDED IN
VOLUME 4113, PAGE 64 OF SAID DEED RECORDS, MARKING A
SOUTHWEST C
ORNER OF THE HEREIN DESCRIBED TRACT;
THENCE ALONG THE EAST LINE OF PEBBLE CREEK, PHASE 8-C AND PHASE 8-A THE
FOLLOWING ELEVEN (11) COURSES:
1) N 45°16'58" E - 13.25' TO A 1/2" DIAMETER REBAR IN CONCRETE FOUND FOR AN
ANGLE POINT,
2) N 07°58'02" E - 304.66' TO A 1/2" DIAMETER REBAR IN CONCRETE FOUND FOR AN
ANGLE POINT,
3) N 25°33'31" E - 104.30' TO A 1/2" DIAMETER REBAR IN CONCRETE FOUND FOR AN
ANGLE POINT,
4) N 40-06'10" W - 180.00' TO A 1/2" DIAMETER REBAR IN CONCRETE FOUND FOR
AN ANGLE POINT,
5) N 49°53'50" E - 180.00' TO A 1/2" DIAMETER REBAR IN CONCRETE FOUND FOR AN
ANGLE POINT,
6) AN ARC DISTANCE OF 89.45' ALONG A CURVE TO THE LEFT HAVING A RADIUS
OF 225.00' AND WHOSE CHORD BEARS N 51°29'32" W - 88.87' TO A 1/2"
DIAMETER REBAR IN CONCRETE FOUND FOR AN ANGLE POINT,
7) N 27°50'06" E - 159.21' TO A 1/2" DIAMETER REBAR IN CONCRETE FOUND FOR AN
ANGLE POINT,
8) N 40-06'10" W - 80.81' TO A 1/2" DIAMETER REBAR IN CONCRETE FOUND FOR AN
ANGLE POINT,
9) N 17-13'04" E - 368.30' TO A 1/2" DIAMETER REBAR IN CONCRETE FOUND FOR AN
ANGLE POINT,
10) S 40-06'10" E - 73.88' TO A'/z" DIAMETER REBAR IN CONCRETE FOUND FOR AN
ANGLE POINT,
11) AND N 49°53'50" E - 310.00' (BASE BEARING -PLATTED CALL) TO THE POINT OF
BEGINNING.
co: 4k
1
SURV *141, , 2 1
VIN . .P. .S. NO. 53 4
WO# 12671
PLAT D-1438
12671-FN- l O.DOC
MAP CHK'D BY SRJ
36 <
33
~
OV
G^q I
~N
Scale = 1: 366 (Feet)
S 40° 06' 10" E 149.50
S 10° 03' 26" E 51.87
S 63° 04'22" E 176.24
S 34° 48'W, ch 61.64, r 225.00 R
S 47° 19'37" E 132.84
S 49° 53'50" W 20.00
S 42° 35'32" E 129.67
N 47° 05'41 " E, ch 5.19, r 475.00 L
S 43° 13'05" E 50.00
S 57° 04' 31" E 136.37
S 14° 28'42" E 236.40
S 03° 06'43" E 55.78
S22°37'12"W 110.31
S 48° 21'07" W 55.78
N 33° 04' 14" W 137.00
S 76° 54' 10" W, ch 34.16, r 50.00 R
S 06° 52'34" W 137.00
N 73° 50'09" W 60.39
N 45° 57'23" W 119.19
N 06° 32'26" W 59.40
S 82° 20' 16" W 61.74
S 49° 53'50" W 220.00
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23 S 23° 35'09" W 135.89
24 N 82° 01'58" W 90.00
25 S 07° 58'02" W 190.00
26 N 82°01'58" W 15.00
27 S 07° 58'02" W 156.53
28 S 88° 53'23" W 101.27
29 N 82° 01'58" W 50.00
30 N 07° 58'02" E 62.50
31 N 82° 01'58" W 141.35
32 N 45° 16'58" E 13.25
33 N 07° 58'02" E 304.66
34 N 25° 33'31" E 104.30
35 N 40° 06' 10" W 180.00
36 N 49° 53'50" E 180.00
37 N 51 ° 29' 32" W, ch 88.87, r 225.00 L
38 N 27° 50'06" E 159.21
39 N 40° 06' 10" W 80.81
40 N 17° 13'04" E 368.30
41 S 40° 06' 10" E 73.88
42 N 49° 53'50" E 310.00
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