BRAZORIA COUNTY TEXAS AND INCORPORATED AREAS VOLUME 2 OF 4

COMMUNITY NAME COMMUNITY NUMBER ALVIN, CITY OF 485451 ANGLETON, CITY OF 480064 BAILEY'S PRAIRIE, VILLAGE OF 480065 BONNEY, VILLAGE OF 481300 BRAZORIA, CITY OF 480066 BRAZORIA COUNTY, 485458 UNINCORPORATED AREAS BROOKSIDE VILLAGE, CITY OF 480067 CLUTE, CITY OF 480068 DANBURY, CITY OF 480069 FREEPORT, CITY OF 485467 HILLCREST VILLAGE, CITY OF 485478 HOLIDAY LAKES, TOWN OF 485517 IOWA COLONY, CITY OF 481071 JONES CREEK, VILLAGE OF 480072 LAKE JACKSON, CITY OF 485484 LIVERPOOL, CITY OF 480075 MANVEL, CITY OF 480076 OYSTER CREEK, CITY OF 481255 PEARLAND, CITY OF 480077 QUINTANA, TOWN OF 481301 RICHWOOD, CITY OF 485502 SANDY POINT, CITY OF 480071 SURFSIDE BEACH, CITY OF 481266 SWEENY, CITY OF 485512 WEST COLUMBIA, CITY OF 480081

REVISED PRELIMINARY JUNE 29, 2018 Revised: XXXX YY, 20XX

Federal Emergency Management Agency Flood Insurance Study Number 48039CV002A

NOTICE TO FLOOD INSURANCE STUDY USERS

Communities participating in the National Flood Insurance Program have established repositories of flood hazard data for floodplain management and flood insurance purposes. This Flood Insurance Study may not contain all data available within the repository. It is advisable to contact the community repository for any additional data. This preliminary revised Flood Insurance Study contains profiles presented at a reduced scale to minimize reproduction costs. All profiles will be included and printed at full scale in the final published report. Part or all of this Flood Insurance Study may be revised and republished at any time. In addition, part of this Flood Insurance Study may be revised by the Letter of Map Revision process, which does not involve republication or redistribution of the Flood Insurance Study. It is, therefore, the responsibility of the user to consult with community officials and to check the community repository to obtain the most current Flood Insurance Study components. ATTENTION: On FIRM panels 0430, 0435, 0440, 0445, 0465, 0605, and 0610 the Angleton Levee; and on FIRM panels 0615, 0620, 0640, 0645, 0785, 0795, 0805, 0810, and 0815 the Freeport Hurricane Flood Protection Levee System; have not been demonstrated by the communities or levee owners to meet the requirements of Section 65.10 of the NFIP regulations in 44 CFR as it relates to the levee’s capacity to provide 1-percent-annual-chance flood protection. The subject areas are identified on FIRM panels (with notes and bounding lines) and in the FIS report as potential areas of flood hazard data changes based on further review. FEMA has updated the levee analysis and mapping protocols for non-accredited levees. Until such time as FEMA is able to initiate a new flood risk project to apply the new procedures, the flood hazard information on the aforementioned FIRM panel that are affected by the Angleton Levee and Freeport Hurricane Flood Protection Levee System are being added as a snapshot of the prior effective information presented on the FIRMs and FIS reports dated September 22, 1999 for Brazoria County, Texas and Incorporated Areas. As indicated above, it is expected that affected flood hazard data within the subject area could be significantly revised. This may result in floodplain boundary changes, 1- percent-annual-chance flood elevation changes, and/or changes to flood hazard zone designations. The effective FIRM panels (and the FIS) will again be revised to update the flood hazard information associated with the Angleton and Freeport Levee Systems when FEMA is able to initiate and complete a new flood risk project to apply the updated levee analysis and mapping procedures.

Initial Countywide Flood Insurance Study Date Effective Date: June 5, 1989 First Revised Countywide Flood Insurance Study Date: November 17, 1993 Second Revised Countywide Flood Insurance Study Date: September 22, 1999 Third Revised Countywide Flood Insurance Study Date: TBD TABLE OF CONTENTS

VOLUME 1

1.0 INTRODUCTION ...... 1

1.1 Purpose of Study ...... 1 1.2 Authority and Acknowledgements ...... 1 1.3 Coordination ...... 5 2.0 AREA STUDIED ...... 6

2.1 Scope of Work ...... 6 2.2 Community Description ...... 8 2.3 Principal Flood Problems ...... 10 2.4 Flood Protection Measures ...... 13 3.0 ENGINEERING METHODS ...... 14

3.1 Hydrologic Analyses ...... 14 3.1.1 New Detailed Study Streams ...... 15 3.2 Hydraulic Analyses ...... 26 3.3 Coastal Analyses ...... 28 3.3.1 Storm Surge Analysis and Modeling ...... 28 3.3.2 Statistical Analysis ...... 29 3.3.3 Stillwater Elevations ...... 30 3.3.4 Wave Height Analysis ...... 32 3.3.5 Combined Probability Analysis ...... 37 3.4 Vertical Datum ...... 37 3.5 Effects of Land Subsidence ...... 38 4.0 FLOODPLAIN MANAGEMENT APPLICATIONS ...... 41

4.1 Floodplain Boundaries ...... 41 4.2 Floodways ...... 42 4.3 Depth Criteria ...... 78 5.0 INSURANCE APPLICATIONS ...... 79

6.0 FLOOD INSURANCE RATE MAP ...... 80

7.0 OTHER STUDIES ...... 81

8.0 LOCATION OF DATA ...... 81

9.0 BIBLIOGRAPHY AND REFERENCES ...... 87

10.0 REVISION DESCRIPTIONS ...... 93

10.1 First Revision (November 17, 1993) ...... 93 10.2 Second Revision (September 22, 1999) ...... 94 10.3 Third Revision (TBD) ...... 95

ii

FIGURES

Figure 1 – Transect Layout ...... 33 Figure 2 – Transect Schematic ...... 34 Figure 3 – Land Subsidence Schematic – Riverine Flooding ...... 39 Figure 4 – Floodway Schematic ...... 78 Figure 5 – Depth Criteria Schematic...... 79 TABLES

Table 1 – CCO Meetings ...... 5 Table 2 – Scope of Study ...... 6 Table 3 – Summary of Discharges ...... 17 Table 4 – Summary of Roughness Coefficients ...... 27 Table 5 – Summary of Coastal Stillwater Elevations ...... 30 Table 6 – Transect Data ...... 34 Table 7 – Floodway Data ...... 43 Table 8 – Depth Criteria ...... 79 Table 9 – Community History Map ...... 82 Table 10 – Summary of Non-Coastal Stillwater Elevations ...... 94 Table 11 – Incorporated LOMRs ...... 96 Table 12 – Stream Name Changes ...... 97 VOLUME 2

Exhibit 1 – Flood Profiles

Amoco Drive Overflow 01P Austin Bayou 02P-06P Bastrop Bayou and Bastrop Bayou West 07P-09P Tributary Bastrop Ditch 3 09(a) Bastrop Bayou East Tributary 10P-11P Bastrop Ditch 1 11(a) Bell Creek 12P-13P Berry Road Overflow 14P Brazos River 15P-17P Brushy Bayou 18P-22P Cedar Lake Creek 23P-25P Chigger Creek 26P-27P Chigger Creek Bypass 28P Chocolate Bayou (100-00-00) 29P-34P Clear Creek 35P-38P Cocklebur Slough 39P-41P Cow Creek 42P-43P Cowart Creek 44P-45P Cowart Creek Tributary 1 46P Cowart Creek Tributary 2 47P-48P

iii

VOLUME 3

Exhibit 1 – Flood Profiles (continued)

Cowart Creek Tributary 2 Overflow 1 49P Cowart Creek Tributary 2 Overflow 2 50P Cowart Creek Tributary 2-1 51P Cowart Creek Tributary 2-2 52P Cowart Creek Tributary 3 53P CR 879B Overflow 54P Flores Bayou 55P-57P Halls Bayou 58P-59P Harkey Road Overflow 60P Hickory Slough 61P-62P Linnville Bayou 63P-67P Marys Creek 68P-69P Marys Creek Bypass Channel 70P McLean Road Overflow 71P Mound Creek 72P-73P Mustang Bayou 74P-80P North Hayes Creek (102-00-00) 81P-83P Oyster Creek 84P-86P Pearland Sites Road Overflow 1 87P Pearland Sites Road Overflow 2 88P Rancho Ditch 89P Rancho Ditch South Fork 90P San Bernard River 91P-99P Stevenson Slough 100P-103P South Hayes Creek (103-00-00) 104P-105P Varner Creek 106P-108P Varner Creek Diversion Channel 109P Well Road Overflow 110P West Fork Chocolate Bayou (101-00-00) 111P-112P

VOLUME 4

Exhibit 2 – Transect Profiles

Transects 1 - 40 113P-209P

Exhibit 3 – Flood Insurance Rate Map Index Flood insurance Rate Maps

iv

ELEVATION IN FEET (NAVD 88) - - - 2 1 1 1 1 - 0 5 0 5 0 5 0 5 3 4 3 6 3 8

LIMIT OF 100-YEAR S

T TIDAL FLOODING R E 4 A 0 M D I S T A N C H 4 2 E I N T H O U S 4 A 4 N D S O F F E 4 6 E T A C B O O M V B E I I N C 4 8 E O D N F P L R U O E B N A C B 5 E I 0 L W I T I Y T H B A S T 5 R 2 O P B A J Y O U 5 4

CONFLUENCE OF FLORES BAYOU 5 6 L E C S 1 2 1 0 G 0 % % . T R 2 % R % O A A E E K S A N N A A N S N N N N M N S U U N D U B E A A U E A C 5 L L A D L T C C L 8 I C O H H C H A A N H A N N A L N C C N O C E E C C E E F F A F L L T F L O O I L O O O O O N O D D O D D 6 0 - - 0 5 1 1 1 5 0 5 0

FEDERAL EMERGENCY MANAGEMENT AGENCY 0

2 FLOOD PROFILES

P BRAZORIA COUNTY, TX AND INCORPORATED AREAS AUSTIN BAYOU ELEVATION IN FEET (NAVD 88) - 1 1 1 2 - 0 5 0 5 0 5 0 6 0 L 6 2 M 6 4 N S T R E 6 A 6 M C O D M I S B O T I A COUNTY ROUTE 208 N N E C D 6 8 E P I R N O T B H A O B U I L S I 7 T A 0 Y N D S O F F E 7 2 E T P A B O V E C 7 4 O N F L U E N C 7 Q E 6 W I T H B R A S T 7 R 8 O P B A Y O U 8 0 S 8 2 L E C S 1 2 1 0 0 % % . T R G 2 % R % O A A E E S A N N A A S N N N N N M N S U U N D U B E A A U E A C L L A 8 D L T C C L 4 I C O H H C H A A N H A N N A L N C C N O C E E C C E E F F A F L L T F L O O I L O O O O O N O D D O D D 8 6 - 0 5 1 1 2 5 0 5 0

FEDERAL EMERGENCY MANAGEMENT AGENCY 0

3 FLOOD PROFILES

P BRAZORIA COUNTY, TX AND INCORPORATED AREAS AUSTIN BAYOU ELEVATION IN FEET (NAVD 88) 1 1 2 2 - 5 0 5 0 5 0 5 8 6

T COUNTY ROUTE 210 8 8 9 0 U S T R E 9 A 2 M D I S T A N C 9 4 E I N T H O U S V 9 A 6 N D S O F F E 9 8 E T A B O V E 1 C 0 O 0 N W COUNTY ROUTE 171 F L X U RAILROAD E N C 1 E 0 2 W I T H B A S 1 T 0 R 4 O Y P B A Y O U 1 0 6 Z 1 0 8 L E C S 1 2 1 0 0 % % . G T R 2 % R % O A A E E S A N N A A S N N N N A N M N S U U A N D U B E A A U 1 E A C L L A 1 D L T C C L I 0 C O H H C H A A N H A N N A L N C C N O C E E C C E E F F A F L L T F L O O I L O O O O O N O D D O A D D 1 B ACCESS ROAD 1 2 0 5 1 1 2 2 0 5 0 5

FEDERAL EMERGENCY MANAGEMENT AGENCY 0

4 FLOOD PROFILES

P BRAZORIA COUNTY, TX AND INCORPORATED AREAS AUSTIN BAYOU ELEVATION IN FEET (NAVD 88) 1 1 2 2 3 3 5 0 5 0 5 0 5 1 1 2 A C 1 1 4 1 1 6 S T R E 1 1 A 8 M D I

S STATE ROUTE 35 T A D A N A 1 C E 2 E 0 I N T H O U 1 S 2 A 2 A N F D S O F F 1 E 2 E 4 T A B O V E A 1 C G 2 O 6 N F L U E N C 1 E 2 8 W I T H B A S 1 T 3 R A 0 O H

P COUNTY ROUTE 33 B A Y O U 1 3 2 A I 1 3 4 L E C S 1 2 1 0 0 % % . T R G 2 % R % O A A E E S A N N A A S N N N N N M N S U U N D U B E A A U 1 E A C L L A D L 3 T

C C L PIPELINE A I C 6 O H H C J H A A N H A N N A L N C C N O C E E C C E E F F A A F L L T F K L O O I L O O O O O N O D D O D D 1 3 8 1 1 2 2 3 3 0 5 0 5 0 5

FEDERAL EMERGENCY MANAGEMENT AGENCY 0

5 FLOOD PROFILES

P BRAZORIA COUNTY, TX AND INCORPORATED AREAS AUSTIN BAYOU ELEVATION IN FEET (NAVD 88) 1 2 2 3 3 4 5 0 5 0 5 0 1 3 8

ACCESS ROAD A 1 L 4 0 1 4 2 A M S T R E 1 4 A 4 M D I S T

A ACCESS ROAD A N N 1

C LIMIT OF DETAILED STUDY 4 E 6 I N T H O U S A N D S O F F E E T A B O V E C O N F L U E N C E W I T H B A S T R O P B A Y O U L E C S 1 2 1 0 0 % % . T G R 2 % R % O A A E E S A N N A A S N N N N N M N S U U N D U B E A A U E A C L L A D L T C C L I C O H H C H A A N H A N N A L N C C N O C E E C C E E F F A F L L T F L O O I L O O O O O N O D D O D D 2 2 3 3 4 0 5 0 5 0

FEDERAL EMERGENCY MANAGEMENT AGENCY 0

6 FLOOD PROFILES

P BRAZORIA COUNTY, TX AND INCORPORATED AREAS AUSTIN BAYOU

NOTE: THIS PART OF THE PROFILE LIES WITHIN AN AREA THAT HAS NOT BEEN UPDATED ON THE FIRM AT THIS TIME DUE TO THE PRESENCE OF A LEVEE THAT DOES NOT MEET THE REQUIREMENTS IN NFIP 30 REGULATION 65.10 PLEASE REFER TO THE 30

NOTICE TO FLOOD INSURANCE STUDY NEW AIRPORT ACCESS ROAD USERS PAGE AT THE FRONT OF THIS FIS FOR MORE INFORMATION. FLOOD PROFILES FLOOD 25 25 BASTROP BAYOU BASTROP CONFLUENCE WITH CONFLUENCE BASTROP BAYOU EAST TRIBUTARY

20 CULVERT 20 ELEVATION IN FEET (NAVD 88) IN FEET (NAVD ELEVATION

15 15

G

10 10 LEGEND 0.2% ANNUAL CHANCE FLOOD

1% ANNUAL CHANCE FLOOD

2% ANNUAL CHANCE FLOOD 5 10% ANNUAL CHANCE FLOOD

STREAM BED A B C D E F CROSS SECTION LOCATION AND INCORPORATED AREAS 0 BRAZORIA COUNTY, TX COUNTY, BRAZORIA 114 116 118 120 122 124 126 128 130 132 134 136 FEDERALAGENCY EMERGENCY MANAGEMENT STREAM DISTANCE IN THOUSANDS OF FEET ABOVE CONFLUENCE OF INTRACOASTAL WATERWAY 10P ELEVATION IN FEET (NAVD 88) 1 2 2 3 3 5 0 5 0 5 1 3 6 1 3 8

H RAILROAD COUNTY

1 ROUTE 290 4 0 S T R E A M 1 D 4 I I 2 S

T LIMIT OF A

N DETAILED STUDY C E I 1 N 4 T 4 H O U S A N D S F U N R M P N O A O O R S O E O N E N F R E G E E T T A F T R S I E T U E M C R H E S : L T E E E E O N A T H T P A R T F T C H E A A O I E I T E I R O G S B R H I M F N O E O N E A P L F F Q V T A 6 A A O O 5 E T A T U R H O . R 1 I T C T T A L D R 0 M H E H S O O E I A P V E I N N M F S N T L E S F F O E E I T T E O U L R N H A T I U R N M T O S T E B E H A . E S N E E N P N A T D I E R C R T C N U N O E E O E D N E F F U F O O S F E T I T P F T I L E R P O H D E U S I N I T A D S T L N O T T H I Y E F O R E E T I S T D A S H C W E O I T A H S I N T A L W A T E R W A Y L E C S 1 2 1 0 0 % % . G T R 2 % R % O A A E E S A N N A A S N N N N N M N S U U N D U B E A A U E A C L L A D L T C C L I C O H H C H A A N H A N N A L N C C N O C E E C C E E F F A F L L T F L O O I L O O O O O N O D D O D D 2 2 3 3 0 5 0 5

FEDERAL EMERGENCY MANAGEMENT AGENCY 1

1 FLOOD PROFILES

P BRAZORIA COUNTY, TX AND INCORPORATED AREAS BASTROP BAYOU EAST TRIBUTARY

ELEVATION IN FEET (NAVD 88) - 1 1 2 3 4 0 0 0 0 0 0 0 CONFLUENCE WITH SAN BERNARD RIVER 2 A 4 S B T R E A M 6 D I S C T A B N A C C E K 8 W I N A T D T H E O R U F S R A E O 1 N 0 M D S S A O F N F B F E E R E 1 N T 2 A A R B D O R V I E V E C R G O 1 N 4 F L U E N C E 1 W 6 I H T

H STATE HIGHWAY 35 S A N B I E 1 R 8 N A R D R I V E 2 0 R L E C S 1 2 1 0 0 % % . T R 2 G % R % O A A E E S A N N A A S N N N N N M N S U U N D U B E A A U E A C L L A D L T C C L I C O H H C H A A N H A N N A L N C C N O C E E C C E E F F A F L L T F L O O I L O O O O O N O D D O D D 0 1 2 3 4 0 0 0 0

FEDERAL EMERGENCY MANAGEMENT AGENCY 1

2 FLOOD PROFILES

P BRAZORIA COUNTY, TX AND INCORPORATED AREAS BELL CREEK ELEVATION IN FEET (NAVD 88) 10 20 30 40 20 J BACKWATER FROM SAN BERNARD RIVER 22 K STATE HIGHWAY 35 24 L STREAM DISTANCE IN THOUSANDS OF FEET ABOVE CONFLUENCE WITH SAN BERNARD RIVER M 26 28 N LIMIT OF DETAILED STUDY LEGEND CROSS SECTION LOCATION STREAM BED 10% ANNUAL CHANCE FLOOD 2% ANNUAL CHANCE FLOOD 1% ANNUAL CHANCE FLOOD 0.2% ANNUAL CHANCE FLOOD 20 30 40

FEDERAL EMERGENCY MANAGEMENT AGENCY 13P FLOOD PROFILES BRAZORIA COUNTY, TX AND INCORPORATED AREAS BELL CREEK

ELEVATION IN FEET (NAVD 88) - - - - - 3 3 2 2 1 1 1 2 2 3 5 0 5 0 5 6 0 5 0 5 0 4 B S A T Y H U R C E R E T I O F 1 D T A N 0 O A C - T L , O E R 2 F C - O P L 6 A L L O R O N L O O E D S D F D E 0 I I L N . T 2 E

LIMIT OF 100-YEAR G O - T D P TIDAL FLOODING T O E H R 8 B E C E 1 E S - E N H P T E O R W W C F A N E S T S 1 N T E 0 E T R G R P E W S A A A U R H M T R A E F T D R A E I S C L I T Y E 1 A 2 P N R C J O E F I K I N L E M S I L L 1 E 4 S A M B CONFLUENCE OF O

V BUFFALO CAMP BAYOU E C 1 6 O N F N L U E O N C 1 E 8 O F I N T R A P C 2 O 0 A S T A L Q W A 2 T 2 E R W R A L T L T Y S

O RAILROAD S FM 521 O = = R R 3 S 3 = = 4 0 2 3 3 . . 5 4 8 0 2 . . 5 0 L E C S 1 2 1 0 0 % % . T R G 2 % R % O A A E E S A N N A A S N N N N N M N S U U N D U B E A A U E A C L L A D L T C C L I C O H H C H A A N H A N N A L N C C N O C E E C C E E F F A F L L T F L O O I L O O O O O N O D D O D D - - - 6 1 1 2 2 3 2 2 1 0 5 0 5 0 5 0 5

FEDERAL EMERGENCY MANAGEMENT AGENCY 1

5 FLOOD PROFILES

P BRAZORIA COUNTY, TX AND INCORPORATED AREAS BRAZOS RIVER ELEVATION IN FEET (NAVD 88) ------3 3 2 2 1 1 2 2 3 3 4 - 5 0 5 0 5 0 8 3 5 0 5 0 2 4 T 2 6 U 2 8 S 3 T 0 R V E A W M D I

S CONFLUENCE OF T

3 VARNER CREEK A 2 X N

C STATE HIGHWAY 35 E I N M I L 3 Y E 4 S A B O V Z E C 3 6 O N F L A U A E N C 3 E 8 O F I N T R A B P A A T H R C R 4 E O O E 0 A A F 1 T C I S 0 O L - T E , O A 2 T L C - O A W L O N B A 4 D E S T 2 E E S 0 R . H T 2 W O O - P A W T E Y H N R E S C 1 E E - P N P A T E R W R A C T A E E T N L E Y T R W S U A R T L E F E C S 1 2 1 0 R A 0 % % . G T R 2 % R C % O A A S E E S A N N E A A U S N N N N N M N S U U P N R D U B E A A U R E F A C L L A D L T A C C L O I C O H H C C F H A A N H A N N E I A L L N C C N O C E E E C C E E F F A S F L L T F L O O I L O O O O O N O D D O D D - - - - - 2 2 3 3 4 2 2 1 1 8 3 5 0 5 0 5 0 5 0

FEDERAL EMERGENCY MANAGEMENT AGENCY 1

6 FLOOD PROFILES

P BRAZORIA COUNTY, TX AND INCORPORATED AREAS BRAZOS RIVER ELEVATION IN FEET (NAVD 88) ------3 2 2 1 1 3 4 4 5 - 0 5 0 5 0 5 6 0 5 0 4 2 T T T A O O H D E O B 2 E C - A L S A E O H N S O D E 4 W 4 0 T . N A 2 O F - S T P E H E P E R A A C R 1 G E - A 4 P N T 6 E E T R L W Y C A E T N E T R W S S 4 T A A U 8 R H T R E E F R A A M S C U E D R I P S F R T A 5 O A C 0 F N E I C L A P E E I R S I O N A A F J R M I L E I E L 5 E 2 ------S 3 2 2 1 1 3 4 4 5 - 0 5 0 5 0 5 6 0 5 0 A B O V E - - 0 5 4 5 5 6 6 1 5 6 0 5 0 5 C 5 0 2 O S T T N O H H F E O T L W H 2 U A - E N E K P N 1 S E - C E R 5 P E P C 4 E A O E R R N F C A T

I CONFLUENCE OF E N T W N E T COW CREEK A T R L L A Y A T W C E 5 A O R 6 T A E S S R U T R A S F L A U

FM 1462 A M R W C F A E A 5 T 8 C P E R E R O W P F R A A I N O L Y E F A I I L O S E 6 T 0 T A O P O O B C E L A O Q S E 6 2 L E C S 1 2 1 0 0 % % . T G R 2 % R % O A A E E S A N N A A A S N N N N N M R N S U U N D U B E A A U E A C L L 6 A D L T A C C L 4 I C S O H H C H A A N H A N N A L N C C N O C E E C C E E F F A F L L T F L O O I L O O O O O N O D D O D D

6 COUNTY BOUNDARY 6 - - 0 5 4 5 5 6 6 1 5 6 0 5 0 5 0

FEDERAL EMERGENCY MANAGEMENT AGENCY 1

7 FLOOD PROFILES

P BRAZORIA COUNTY, TX AND INCORPORATED AREAS BRAZOS RIVER ELEVATION IN FEET (NAVD 88) 1 1 - 2 0 2 4 6 8 0 2 0 . 6 0 . 8 1 . 0 1 . 2 S T R E A M 1 . D 4 I S T A N C E 1 I N . 6 M I L E S F A L B O 1 O . O 8 V D E I N C G O N

LIMIT OF 1% AC C F O C L COASTAL FLOODING N 2 U . T E 0 R N O C C L E L O W E M D I T B H B I 2 N Y . A E 2 U T D I S D P T S A T A R I H U R N L O E R E F B B L F 1 A T A O A - O Y 2 B C O A O . O I 4 L N E D U I C D I T P N Y L R 0 G O . O 2 S - F E P I

L COUNTY ROUTE 213 T E E 2 O R

. T KING ROAD C 6 T O E H N B E E T 1 S W - P H A E O T R 2 W E . C R 8 N E S L N S D U E E T C S 1 2 1 0 0 % % . T R G R 2 P % R W % O A A F A E E S A N N A A A A S N R N N N N M N S U U T C N A D U B E A A U E E E A C T 3 L L A D L R T C C L . E P I 0 C O H H C L H A A R N H Y A N N A L O N C C N O C E E C C F E E F F A I F L L T L F L O O I L O E O O O O N O S D D O D D 3 . 2 2 4 6 8 1 1 0 2

FEDERAL EMERGENCY MANAGEMENT AGENCY 1

8 FLOOD PROFILES

P BRAZORIA COUNTY, TX AND INCORPORATED AREAS BRUSHY BAYOU ELEVATION IN FEET (NAVD 88) 1 1 1 4 6 8 0 2 4 3 . 2 S A T H U R E R E F 1 T A - O C A O 3 N E . 4 C D P L R 0 O . O 2 S - F E P I L T E E O R T 3 C T O . 6 E H N B E E T 1 S W - P H A E O T R W E C 3 R N . E 8 E S N S U E T S R P W T F A R A A R E T C A A E E T M R E 4 P . L D R 0 Y I O S F T I A L E N S C E 4 I N . 2 M

I LIMIT OF L E F DETAILED STUDY S A B 4 O . 4 V E C O N F L U E N C E W I T H A U S T I N B A Y O U L E C S 1 2 1 0 0 % % . T G R 2 % R % O A A E E S A N N A A S N N N N N M N S U U N D U B E A A U E A C L L A D L T C C L I C O H H C H A A N H A N N A L N C C N O C E E C C E E F F A F L L T F L O O I L O O O O O N O D D O D D

FEDERAL EMERGENCY MANAGEMENT AGENCY 1

9 FLOOD PROFILES

P BRAZORIA COUNTY, TX AND INCORPORATED AREAS BRUSHY BAYOU 40 40 NOTE: THIS PART OF THE PROFILE LIES WITHIN AN AREA THAT HAS NOT BEEN UPDATED ON THE FIRM AT THIS TIME DUE TO THE PRESENCE OF A LEVEE THAT DOES NOT MEET THE REQUIREMENTS IN NFIP 35 35 REGULATION 65.10 PLEASE REFER TO THE NOTICE TO FLOOD INSURANCE STUDY USERS PAGE AT THE FRONT OF THIS FIS FOR MORE INFORMATION. FM523

30 RAILROAD 30 BUCHITA ROAD HOSPITAL DRIVE COUNTY ROUTE 428 COUNTY ROUTE 443 COUNTY ROUTE 210 COUNTY ROUTE COUNTY ROAD 171 LIMIT OF DETAILED STUDY LIMIT OF DETAILED

25 25 BRUSHY BAYOU FLOOD PROFILES 20 20

15 15 LIMITS ELEVATION IN FEET (NAVD 88) IN FEET ELEVATION

10 10 CORPORATED

K

5 5

STATE ROUTE 35 LEGEND 0.2% ANNUAL CHANCE FLOOD

1% ANNUAL CHANCE FLOOD

2% ANNUAL CHANCE FLOOD 0 10% ANNUAL CHANCE FLOOD

STREAM BED

G H I J CROSS SECTION LOCATION AND INCORPORATED AREAS

-5 BRAZORIA COUNTY, TX 26 27 28 29 30 31 32 33 34 35 36 37 38 39 FEDERAL EMERGENCY MANAGEMENT AGENCY STREAM DISTANCE IN THOUSAND FEET ABOVE CONFLUENCE WITH AUSTIN BAYOU 20P 45 45

40 40 FM 523 35 35 DOWNING ROAD STATE ROUTE 288 VELASCO STREET COUTY ROUTE 358 COUNTY ROUTE 48 KARANKAWA ROAD COUNTY ROUTE 341 N. VALDERAS STREET

30 30 BRUSHY BAYOU FLOOD PROFILES 25 25

20 20 ELEVATION IN FEET (NAVD 88) IN FEET ELEVATION

15 15

NOTE: THIS PART OF THE PROFILE LIES WITHIN AN O P Q AREA THAT HAS NOT BEEN UPDATED ON THE FIRM 10 AT THIS TIME DUE TO THE PRESENCE OF A LEVEE 10 THAT DOES NOT MEET THE REQUIREMENTS IN NFIP LEGEND REGULATION 65.10 PLEASE REFER TO THE NOTICE 0.2% ANNUAL CHANCE FLOOD TO FLOOD INSURANCE STUDY USERS PAGE AT THE 1% ANNUAL CHANCE FLOOD

FRONT OF THIS FIS FOR MORE INFORMATION. 2% ANNUAL CHANCE FLOOD 5 10% ANNUAL CHANCE FLOOD

STREAM BED

L M N CROSS SECTION LOCATION AND INCORPORATED AREAS

0 BRAZORIA COUNTY, TX 39 40 41 42 43 44 45 46 47 48 49 50 51 52 FEDERAL EMERGENCY MANAGEMENT AGENCY STREAM DISTANCE IN THOUSAND FEET ABOVE CONFLUENCE WITH AUSTIN BAYOU 21P 55 55

50 50

45 45 STATE ROUTE 288 COUNTY ROUTE 339 COUNTY ROUTE LIMIT OF DETAILED STUDY

40 40 BRUSHY BAYOU FLOOD PROFILES 35 35

CULVERT 30 CULVERT 30 ELEVATION IN FEET (NAVD 88) IN FEET ELEVATION

25 25

NOTE: THIS PART OF THE PROFILE LIES WITHIN AN AREA THAT HAS NOT BEEN UPDATED ON THE FIRM 20 AT THIS TIME DUE TO THE PRESENCE OF A LEVEE 20 THAT DOES NOT MEET THE REQUIREMENTS IN NFIP LEGEND REGULATION 65.10 PLEASE REFER TO THE NOTICE 0.2% ANNUAL CHANCE FLOOD TO FLOOD INSURANCE STUDY USERS PAGE AT THE FRONT OF THIS FIS FOR MORE INFORMATION. 1% ANNUAL CHANCE FLOOD 2% ANNUAL CHANCE FLOOD 15 10% ANNUAL CHANCE FLOOD

STREAM BED

R S CROSS SECTION LOCATION AND INCORPORATED AREAS

10 BRAZORIA COUNTY, TX 52 53 54 55 56 57 58 59 60 61 62 63 64 65 FEDERAL EMERGENCY MANAGEMENT AGENCY STREAM DISTANCE IN THOUSAND FEET ABOVE CONFLUENCE WITH AUSTIN BAYOU 22P ELEVATION IN FEET (NAVD 88) - 1 1 1 2 - 0 5 0 5 0 5 0 3 8 4 0 C 4 2 O N S T T R R E O A L M L E 4 D D 4 I S B T Y A T N I D C A E L I N F 4 L 6 T O H O O D U I N S G A N D 4 8 S O F F E E T 5 A 0 B O V E C O N 5 F LIMIT OF 100-YEAR 3 L

U TIDAL FLOODING E L N

C FM 2611 E O F 5 4 I N T R A M C O A S 5 T 6 A L W A C T O N E M R B 5 W 8 I N A E Y D P R O B O 6 A 0 B I L L E I C S 1 2 1 0 T 0 % % . T G R 2 Y % R % O A A E E S A N N A A S N N N N N M N S U U N D U B E A A U E A C L L 6 A D L T C C L 2 I C O H H C H A A N H A N N A L N C C P N O C E E C C E E F F A F L L T F L O O I L O O O O O N O D D O D D 6 4 - - 0 5 1 1 2 1 5 0 5 0 0

FEDERAL EMERGENCY MANAGEMENT AGENCY 2

3 FLOOD PROFILES

P BRAZORIA COUNTY, TX AND INCORPORATED AREAS CEDAR LAKE CREEK ELEVATION IN FEET (NAVD 88) - 1 1 1 2 - 0 5 0 5 0 5 0 6 4 Q 6 6 R 6 8 S T R C E O A S M M B 7 D I 0 N I S E T D A N P R C O E T B I N A 7 2 B T I H L I O T Y U S A N D 7 4 S U O F F E E T 7 A 6 B O V E C O V N 7 F 8 L U E N C E O F 8 0 I N W T R A C O A S 8 T 2 A X L W A T E R 8 W 4 A Y L E C S 1 2 1 0 0 % % . G T R 2 % R % O A A E E S A N N A A S N N N N N M N S U U N D U B E A A U E A C L L A D L T C C L I C O H H C H A A N H A N N A L N C C N O C E E C C E E F F A F L L T F L O O I L O O O O O N O D D O D D - - 0 5 1 1 2 1 5 0 5 0 0

FEDERAL EMERGENCY MANAGEMENT AGENCY 2

4 FLOOD PROFILES

P BRAZORIA COUNTY, TX AND INCORPORATED AREAS CEDAR LAKE CREEK ELEVATION IN FEET (NAVD 88) 1 1 2 2 - 5 0 5 0 5 0 5 8 4 Y 8 Z 6 A A 8 8 A B S T R E A M A C 9 D 0 I S T A N A FM 521 D C E

I LIMIT OF DETAILED STUDY N 9 2 T H O U S A N D S O F F E E T A B O V E C O N F L U E N C E O F I N T R A C O A S T A L W A T E R W A Y L E C S 1 2 1 0 G 0 % % . T R 2 % R % O A A E E S A N N A A N S N N N N M N S U U N D U B E A A U E A C L L A D L T C C L I C O H H C H A A N H A N N A L N C C N O C E E C C E E F F A F L L T F L O O I L O O O O O N O D D O D D

FEDERAL EMERGENCY MANAGEMENT AGENCY 2

5 FLOOD PROFILES

P BRAZORIA COUNTY, TX AND INCORPORATED AREAS CEDAR LAKE CREEK

ELEVATION IN FEET (NAVD 88) -15 -10 10 15 20 25 30 -5 0 5 52

LIMIT OF 100-YEAR TIDAL FLOODING K 54

COUNTY ROUTE 171 L 56 58 M

RAILROAD COMBINED PROBABILITY STREAM DISTANCE IN THOUSANDS OF FEET ABOVE FM 2004 60 62 64 N 66 68 70 72 LEGEND CROSS SECTION LOCATION STREAM BED 10% ANNUAL CHANCE FLOOD 2% ANNUAL CHANCE FLOOD 1% ANNUAL CHANCE FLOOD 0.2% ANNUAL CHANCE FLOOD -10 -5 0 5 10 15 20 25

FEDERAL EMERGENCY MANAGEMENT AGENCY 29P FLOOD PROFILES BRAZORIA COUNTY, TX CHOCOLATE BAYOU AND INCORPORATED AREAS (100-00-00) ELEVATION IN FEET (NAVD 88) -10 10 15 20 25 30 -5 0 5 72 O 74 76 P 78 STREAM DISTANCE IN THOUSANDS OF FEET ABOVE FM 2004 80 82

Q STATE ROUTE 35 84 86 88 90 R 92 LEGEND CROSS SECTION LOCATION STREAM BED 10% ANNUAL CHANCE FLOOD 2% ANNUAL CHANCE FLOOD 1% ANNUAL CHANCE FLOOD 0.2% ANNUAL CHANCE FLOOD 0 5 10 15 20 25 30

FEDERAL EMERGENCY MANAGEMENT AGENCY 30P FLOOD PROFILES BRAZORIA COUNTY, TX CHOCOLATE BAYOU AND INCORPORATED AREAS (100-00-00) ELEVATION IN FEET (NAVD 88) -10 10 15 20 25 30 35 -5 0 5 92 94 S 96 T COUNTY ROUTE 172 98 STREAM DISTANCE IN THOUSANDS OF FEET ABOVE FM 2004 100 U 102 104 106 108 V 110 112 114 LEGEND CROSS SECTION LOCATION STREAM BED 10% ANNUAL CHANCE FLOOD 2% ANNUAL CHANCE FLOOD 1% ANNUAL CHANCE FLOOD 0.2% ANNUAL CHANCE FLOOD 116 0 5 10 15 20 25 30 35

FEDERAL EMERGENCY MANAGEMENT AGENCY 31P FLOOD PROFILES BRAZORIA COUNTY, TX CHOCOLATE BAYOU AND INCORPORATED AREAS (100-00-00) ELEVATION IN FEET (NAVD 88) 10 15 20 25 30 35 40 5 116 W 118 FM 1462 120 122 X STREAM DISTANCE IN THOUSANDS OF FEET ABOVE FM 2004 124 126 Y 128 130 132 Z 134

CONFLUENCE OF HAYES CREEK 136 138 AA LEGEND

CROSS SECTION LOCATION STREAM BED 10% ANNUAL CHANCE FLOOD 2% ANNUAL CHANCE FLOOD 1% ANNUAL CHANCE FLOOD 0.2% ANNUAL CHANCE FLOOD CONFLUENCE OF UNNAMED TRIBUTARY TO

140 CHOCOLATE BAYOU 15 20 25 30 35 40

FEDERAL EMERGENCY MANAGEMENT AGENCY 32P FLOOD PROFILES BRAZORIA COUNTY, TX CHOCOLATE BAYOU AND INCORPORATED AREAS (100-00-00) 55 55

50 50

45 45 PRIVATE ROAD CONFLUENCE OF WEST FORK CHOCOLATE BAYOU

40 40 (100-00-00) CHOCOLATE BAYOU FLOOD PROFILES 35 35

30 30 ELEVATION IN FEET (NAVD 88) IN FEET ELEVATION

25 25

AF AG AH

20 20 LEGEND 0.2% ANNUAL CHANCE FLOOD

1% ANNUAL CHANCE FLOOD

15 2% ANNUAL CHANCE FLOOD 10% ANNUAL CHANCE FLOOD

STREAM BED

AB AC AD AE CROSS SECTION LOCATION AND INCORPORATED AREAS

10 BRAZORIA COUNTY, TX 140 142 144 146 148 150 152 154 156 158 160 162 164 166 FEDERAL EMERGENCY MANAGEMENT AGENCY STREAM DISTANCE IN THOUSAND FEET ABOVE FM 2004 33P 70 70

65 65

60 60 PRIVATE DRIVE MASTERS ROAD BRISCOE CANAL COUNTY ROUTE 67 COUNTY ROUTE LIMIT OF DETAILED STUDY COUNTY ROUTE 72/CLARK ROAD 55 COUNTY ROUTE 81/ALLELUIA TRAIL 55 (100-00-00) CHOCOLATE BAYOU FLOOD PROFILES 50 50

45 45 ELEVATION IN FEET (NAVD 88) IN FEET ELEVATION

40 40

35 35 LEGEND 0.2% ANNUAL CHANCE FLOOD

1% ANNUAL CHANCE FLOOD

30 2% ANNUAL CHANCE FLOOD 10% ANNUAL CHANCE FLOOD

STREAM BED

AI AJ AK AL AM AN CROSS SECTION LOCATION AND INCORPORATED AREAS

25 BRAZORIA COUNTY, TX 166 168 170 172 174 176 178 180 182 184 186 188 190 192 FEDERAL EMERGENCY MANAGEMENT AGENCY STREAM DISTANCE IN THOUSAND FEET ABOVE FM 2004 34P

ELEVATION IN FEET (NAVD 88) 1 1 2 2 5 0 5 0 5 2 0 2 2 C O N T 2 R 4 O L L E S D T R B E Y A 2 T M 6 I D D A I L S T F A L O N O C D E 2 8 I I N N G T H O U S A 3 N 0 D S O P F C R F O O E M B E 3 T A T A B T 2 O H R J B I N A E E I B L E B I 1 E T D T O 0 O Y S V - K O H E A O N C C D W L O 3 O 4 N 2 N S - F S E P L E E U T P R E O L A N C R T C E A H E N T E 3 T W E 6 1 L W I - T Y A P H T E C E R E R C D E S A N U R 3 T R 8 L F M W A A K A C E T E E C P R R R S E O U E 4 F K R 0 I L F E A S C E P R O 4 F 2 I L E L E C S 1 2 1 0 N 0 % % . T G R 2 % R % O A A E

E FM 2611 S A N N A A S N N N N N M N S U U N D U B E A A U E A C L L 4 A D L T C C L 4 I C O H H C H A A N H A N N A L N C C N O C E E C C O E E F F A F L L T F L O O

I COUNTY ROUTE 316 L O O O O O N O D D O D D 4 6 1 1 2 2 0 5 0 5

FEDERAL EMERGENCY MANAGEMENT AGENCY 3

9 FLOOD PROFILES

P BRAZORIA COUNTY, TX AND INCORPORATED AREAS COCKLEBUR SLOUGH ELEVATION IN FEET (NAVD 88) 1 2 2 3 5 0 5 0 4 6 1 P T - H P E E 2 R - C P E E 4 N R 8 Q T C W E COUNTY ROUTE 316 N A T T E W R A S T 5 U E 0 R R R F S A U S C T R E R F E P A A R C 5 M O E 2 F P D I R S L I S E O T T F A O I N L E C B E E I 5 S T 4 S I T N H O T O O H W O C N L U O S S E S A 5 P E N 6 A U T D R O S

A ACCESS ROAD T O T H E F E L F Y E E 5 T 8 A V B O V E C O 6 0 N F L U W E N

C ACCESS ROAD E 6 W 2 I T H X C E D A R 6 4 L A K E C R Y E

E COUNTY ROUTE 628 6 K 6 6 Z 8 ACCESS ROAD L E C S 1 2 1 0 0 % % . T G R 2 % R % O A A E E S A N N A A S N N N N N M N S U U N D U B E A A U E A C L L 7 A D L T C C L 0 I C O H H C H A A N H A N N A L N C C N O C E E C C E E F F A F L L T F L O O I L O O O O O N O D D O D D 1 2 2 3 5 0 5 0

FEDERAL EMERGENCY MANAGEMENT AGENCY 4

0 FLOOD PROFILES

P BRAZORIA COUNTY, TX AND INCORPORATED AREAS COCKLEBUR SLOUGH ELEVATION IN FEET (NAVD 88) 2 2 3 0 5 0 7 0 A A FM 521 7 2 7 A 4 B S T R E A 7 M 6 D I S T

A LIMIT OF N A C

C DETAILED STUDY E 7 FM 524 8 I N T H O U S A N D S O F F E E T A B O V E C O N F L U E N C E W I T H C E D A R L A K E C R E E K L E C S 1 2 1 0 0 % % . T G R 2 % R % O A A E E S A N N A A S N N N N N M N S U U N D U B E A A U E A C L L A D L T C C L I C O H H C H A A N H A N N A L N C C N O C E E C C E E F F A F L L T F L O O I L O O O O O N O D D O D D

FEDERAL EMERGENCY MANAGEMENT AGENCY 4

1 FLOOD PROFILES

P BRAZORIA COUNTY, TX AND INCORPORATED AREAS COCKLEBUR SLOUGH 80 80

1% ANNUAL CHANCE BACKWATER FROM BRAZOS RIVER

70 70

0.2%, 1%, AND 2% ANNUAL CHANCE FLOODS COINCIDE

60 60

50 50 COW CREEK FLOOD PROFILES

40 40

30 30 ELEVATION IN FEET (NAVD) ELEVATION

20 20

10 10 LEGEND 0.2% ANNUAL CHANCE FLOOD

1% ANNUAL CHANCE FLOOD

2% ANNUAL CHANCE FLOOD

4% ANNUAL CHANCE FLOOD*

10% ANNUAL CHANCE FLOOD

STREAM BED AND INCORPORATED AREAS

D E F G BRAZORIA COUNTY, TX CROSS SECTION LOCATION

* DATA NOT AVAILABLE -10 FEDERAL EMERGENCY MANAGEMENT AGENCY 10,000 12,000 14,000 16,000 18,000 20,000 22,000 24,000 26,000 28,000 30,000 32,000 34,000 36,000

STREAM DISTANCE IN FEET ABOVE CONFLUENCE WITH BRAZOS RIVER 42P 100 100 1% ANNUAL CHANCE BACKWATER FROM BRAZOS RIVER

90 90

80 ACCESS ROAD 80 COUNTY ROAD 17

0.2%, 1%, AND 2% ANNUAL

CHANCE FLOODS COINCIDE 70 70 COW CREEK FLOOD PROFILES

60 60 LIMIT OF DETAILED STUDY

50 50 ELEVATION IN FEET (NAVD) ELEVATION

40 40

30 30 LEGEND 0.2% ANNUAL CHANCE FLOOD

1% ANNUAL CHANCE FLOOD

2% ANNUAL CHANCE FLOOD 20 4% ANNUAL CHANCE FLOOD* 10% ANNUAL CHANCE FLOOD

STREAM BED AND INCORPORATED AREAS

H I J K L M N BRAZORIA COUNTY, TX CROSS SECTION LOCATION

* DATA NOT AVAILABLE 10 FEDERAL EMERGENCY MANAGEMENT AGENCY 26,000 28,000 30,000 32,000 34,000 36,000 38,000 40,000 42,000 44,000 46,000 48,000 50,000 52,000

STREAM DISTANCE IN FEET ABOVE CONFLUENCE WITH BRAZOS RIVER 43P

60 60 1% ANNUAL CHANCE BACKWATER EFFECTS FROM COWART CREEK DRIVEWAY 55 55 CULVERT RAILROAD MORA WAY AVITTS ACRES AMOCO DRIVE LIMIT OF STUDY PRIVATE ROAD RAMIREZ ROAD UNNAMED ROAD UNNAMED ROAD PRIVATE BRIDGE 50 PRIVATE BRIDGE 50 COUNTY ROAD 128 COUNTY ROAD 129 STATE HIGHWAY 35 PEARLAND SITES ROAD BRIDGE PRIVATE

45 CONFLUENCE OF COWART CREEK TRIBUTARY 2 OVERFLOW 2 45 CONFLUENCE OF AMOCO DRIVE OVERFLOW FLOOD PROFILES

40 40 COWART CREEK TRIBUTARY 1 CONFLUENCE WITH COWART CREEK CONFLUENCE WITH 35 35 ELEVATION IN FEET (NAVD) ELEVATION

30 30

G H I J

25 25 LEGEND 0.2% ANNUAL CHANCE FLOOD

1% ANNUAL CHANCE FLOOD

2% ANNUAL CHANCE FLOOD 20 4% ANNUAL CHANCE FLOOD* 10% ANNUAL CHANCE FLOOD

STREAM BED AND INCORPORATED AREAS

A B C D E F BRAZORIA COUNTY, TX CROSS SECTION LOCATION

* DATA NOT AVAILABLE 15 FEDERAL EMERGENCY MANAGEMENT AGENCY 0 2,000 4,000 6,000 8,000 10,000 12,000 14,000 16,000 18,000 20,000 22,000 24,000 26,000

STREAM DISTANCE IN FEET FROM CONFLUENCE WITH COWART CREEK 46P