Floodplain (FEMA) Maps and General Flood Information

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Click on any of the maps listed below to open and view the FEMA floodplains. These maps show different levels of detail that can be used to determine where the area you are interested in is located, in relation to the FEMA Floodplains.

More detailed maps are available at the City of Carrollton's Engineering Department located in City Hall at 1945 E. Jackson road. Glenn Hughes, P.E. or Michael McKay, P.E. will be available to assist you, should you have questions or need additional information about the revisions to the FEMA floodplains at (972) 466-3200.

Flood and Drainage Management in Carrollton:

1.    There are four major drainageways across the city, not including the Elm Fork of the Trinity on the western boundary of Carrollton. The Elm Fork is managed primarily by the City of Dallas and the city drainageways are managed by Carrollton.

2.    Most of the channels in Carrollton have been improved through the use of stone, concrete blocks and concrete. These improvements in the last several years have been permitted through the US Army Corps of Engineers as part of Section 404 of the Clean Water Act.  In short, the 404 Permit puts extensive restrictions on any modifications to the channels along with requirements for vegetation and ultimate stabilization.

3.    Vegetation for the channels must be of certain types that are considered native to the area. This vegetation must be allowed to grow and spread throughout the channel area. This provides protection of the typically highly erosive banks along the creek as well as wildlife habitat areas. It is also a condition of the Section 404 Permit.  There is no provision for cutting this vegetation as part of the permit. We do cut it back when it becomes detrimental to the flow in the channel.

4.    The channels through the city are analyzed on a routine basis. This analysis considers a number of factors, including the vegetation along the channel slopes to determine a flood elevation for a particular design flood.

5.    The City participates in the NFIP, the National Flood Insurance Program. That establishes design criteria for flooding (1% chance or 100 year rainfall intensity) to determine flood elevations and floodplain / floodway limits. The city also participates in the Community Rating System, a voluntary program where insurance credits for homeowners are earned through activities the city implements to reduce flooding possibility – these include design parameters for buildings as well as maintenance of channels. The city has a rating of 6 on a scale of 1 (excellent) to 10 (no activity). This is one of the better ratings in the metroplex.

6.    The city implements the concept of ‘higher standards’ in the flood criteria for new developments. This includes requiring finished floors to be 2 feet above the 100 year flood plain (the NFIP requires 0.0 feet) and requiring that any floodplain reclamation has no offsite increase in flood elevations (NFIP is up to 1 foot increase).  

Overall, flooding in Carrollton is buffered by Lake Lewisville and Lake Ray Roberts and, to a lesser degree, Lake Grapevine. These reservoirs are controlled by the Army Corps of Engineers to reduce the peak flows into the Elm Fork of the Trinity, allowing city drainage to flow more freely. Even with the emergency releases from Lake Lewisville in 2015, the city had minimal flooding outside of known flood prone areas.  

We continue to aggressively manage drainage. We are looking at a full, city wide channel modeling update and master plan in the next year or two. We are also looking at developing a rain gauge / river gauge system to assist in Emergency Management operations. We typically have a channel improvement project under construction each year to reduce erosion and improve flows. We participate in the North Central Texas Council of Governments (NCTCOG) Corridor Development Certificate program, which limits development in the Trinity River basin (including Elm Fork) to maintain manageable peak drainage flows.  

Feel free to contact the City’s Floodplain Administrator, Mike McKay, P.E. at 972-466-3183 if you would like further information.

 

FEMA Flood Map Panels

 

These are the actual FEMA map panels.  They are broken down into counties and cover areas that may extend into other cities outside the City of Carrollton.

FEMA Map Panels

This is a map that shows streets in Carrollton and the FEMA floodplain. This map will give a general idea of where the floodplains are in the City of Carrollton.

Carrollton Area Prelim Public

 

FEMA "Stay Dry" Utility Using Google Earth

The "Stay Dry" utility allows you to use Google Earth 1 to review flood hazard information from FEMA's National Flood Hazard Layer (NFHL) using an address or other location information.  You can view flood hazard zones, cross sections and labels, community names and boundaries, Flood Insurance Rate Map (FIRM) numbers and boundaries, and Letter of Map Revision (LOMR) case numbers and boundaries.

Stay Dry (Version 2.0) Instruction

Google Earth Link

 

City Parcel Map with Proposed FEMA Floodplain delineated

This map shows the actual residential and non-residential lots in the City of Carrollton and the actual FEMA floodplains.  It will show the actual lots by street address and whether or not the lot is in the FEMA floodplain.

Carrollton Area Prelim Public with Parcels  

 

Flood Insurance and FEMA

Frequently Asked Questions

General Floodplain Information

Floodsmart.com 

 

 

Trinity River Flood Levels

Stream Gage Information 

 

 

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