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Harris County Watersheds > Galveston Bay

Specific information about the changes in the Galveston Bay 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 Watershed main page.


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)
5.5 sq. mi. 10.0 sq. mi. 2.6 sq. mi. 5.5 sq. mi.
TSARP Studied Stream Miles = 5.4 miles Current Studied Stream Miles = 3.0 miles

Drainage area 19.4 sq. mi.
TSARP 1% Rainfall 24hr duration 13.5 in
Total channel miles 28 mi
Allison: Total flooded area < 1 sq. mi.
Allison: Flooded homes 100
Population 19,868
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