This is an estimate of the Harris County Flood Control District’s proposed project and is not to be used as an official map for floodplain determinations.

Floodway – A regulatory zone within a 1 percent (100-year) floodplain closest to a bayou or creek where land development is regulated by a city or a county.

1% (100-year) Floodplain – An area at risk for flooding from a bayou, creek or other waterway overflowing during a 1 percent (100-year) flood. Structures located in a 1 percent (100-year) floodplain have a minimum of a 1 percent chance of flooding in any given year and a minimum of a 26 percent chance of flooding during a 30-year period of time.

0.2% (500-year) Floodplain – An area at risk for flooding from a bayou, creek or other waterway overflowing during a 0.2 percent (500-year) flood. Structures located in a 0.2 percent (500-year) floodplain have a minimum of a 0.2 percent chance of flooding in any given year and a minimum of a 6 percent chance of flooding during a 30-year period of time.

Channels - Waterways through which stormwater moves or is directed. It is a generic term used by the Harris County Flood Control District in reference to bayous, creeks, small tributaries and some ditches. When identifying channels, the Flood Control District uses a combination of letters and numbers to help easily identify the location of a waterway. On this mapping tool, channels have been labeled with formal identification numbers used by the Flood Control District.

Open Channels – Channels that are open and visible.

Harris County Boundary – A line shown on a map to indicate the boundary of Harris County, Texas. This mapping tool only shows mapped floodplains for areas within Harris County.

Only one of the following map view options can be selected at a time: Mapped Floodplains, Watersheds (color-coded) and Ponding.