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Harris County Watersheds > Greens Bayou

Specific information about the changes in the Greens 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 Watershed main page.

One of the additional streams along Greens Bayou, P118-31-00, has not been released as part of the Preliminary FEMA FIRMs. For more information click here.


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)
46.8 sq. mi. 73.9 sq. mi. 39.9 sq. mi. 51.0 sq. mi.
TSARP Studied Stream Miles = 136.4 miles Current Studied Stream Miles = 126.5 miles

Drainage area 210.9 sq. mi.
TSARP 1% Rainfall 24hr duration 13.2 in
Total channel miles 306 mi
Allison: Total flooded area 141 sq. mi.
Allison: Flooded homes 28,000
Population 397,748
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