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| FEMA Preliminary Flood Insurance rate Maps |
Current FEMA Flood Insurance Rate Maps |
| 1% (100-Yr) |
0.2% (500-Yr) |
1% (100-Yr) |
0.2% (500-Yr) |
| 26.8 sq. mi. |
41.0 sq. mi. |
22.1 sq. mi. |
28.3 sq. mi. |
| TSARP Studied Stream Miles = 61.4 miles |
Current Studied Stream Miles = 48.9 miles |
Floodplain areas are for Harris County and Baytown only.
| Drainage area |
79 sq. mi. |
| TSARP 1% Rainfall 24hr duration |
12.4 in. |
| Total channel miles |
122 mi. |
| Allison: Total flooded area |
< 1 sq. mi. |
| Allison: Flooded homes |
<50 |
| Population |
32,592 |
Data for areas inside of Harris County only.
|
Specific information about the changes in the Cedar Bayou watershed will be
available soon. For information about general changes between the current FEMA floodplain maps and the FEMA Preliminary Flood Insurance Rate Maps, please go to the 
