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Harris County Watersheds > Addicks Reservoir

Specific information about the changes in the Addicks Reservoir 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)
47.1 sq. mi. 60.0 sq. mi. 39.6 sq. mi. 50.4 sq. mi.
TSARP Studied Stream Miles = 64.6 miles Current Studied Stream Miles = 63.4 miles
Drainage area 137 sq. mi.
TSARP 1% Rainfall 24hr duration 12.4 in
Total channel miles 155 mi
Allison: Total flooded area < 1 sq. mi.
Allison: Flooded homes <50
Population 152,682

Data for areas inside of Harris County only.
  © 2008 FEMA and Harris County Flood Control District. All rights reserved. Terms & Conditions