Flooding remains the leading cause of natural-disaster loss across the United States. The Interagency Flood Risk Management (InFRM) team brings together Federal Partners with mission areas of hazard mitigation, emergency management, floodplain management, natural resources management or conservation to leverage the skillsets, resources and programs to determine the needs of communities and define solutions and implement measures to reduce long term flood risk throughout the States of Arkansas, Louisiana, New Mexico, Oklahoma and Texas.
In 2014, the Federal Emergency Management Agency (FEMA) began sponsorship of the InFRM team initiative to allow Federal teams across the States of Texas, Oklahoma, New Mexico, Louisiana and Arkansas to better align and integrate. Currently, the InFRM team is comprised of FEMA, US Army Corps of Engineers, US Geological Survey, and the National Weather Service. No single agency has all the answers, but through a coordinated effort of multiple programs and various perspectives, a cohesive solution can be found. By applying their shared knowledge, the InFRM team can also enhance response and recovery efforts when flood events do occur.
While floods are impossible to prevent completely, and there is no way to guarantee protection of property, loss of life can be greatly reduced when communities have access to good data, practice sound land use, floodplain management and development practices and incorporate warning systems. Local communities can partner with the InFRM team to investigate solutions to reduce their communities flood risk.
This effort will be accomplished by an interagency coalition comprised of the Federal Emergency Management Agency, U.S. Army Corps of Engineers, U.S. Geological Survey, and the National Weather Service. These agencies are currently in partnership through the group known as the Interagency Flood Risk Management (InFRM) team and this effort will be undertaken by this group. The InFRM team will reach out to state and local government organizations as well as private industry to aid in moving this monumental effort forward.
InFRM operates under the umbrella of the Integrated Water Resources Science and Services (IWRSS), a business model for interagency collaboration. IWRSS brings a consortium of United States federal agencies with complementary water resources missions together to share resources to help solve the nation's water resources issues. In 2011 several Federal agencies came together and initiated an Interagency Memorandum of Understanding to create IWRSS. IWRSS's overarching objective is to enable and demonstrate a broad, integrative national water resources information system to serve as a reliable and authoritative means for adaptive water-related planning, preparedness and response activities. The goals are to:
The members of IWRSS are the same four United States federal agencies as InFRM: USACE, USGS, NOAA, and FEMA.
Base Level Engineering is a watershed-wide engineering modeling method that leverages high resolution ground elevation, automated model building techniques, and manual model review to prepare broad and accurate flood risk information for FEMA to assess its current flood hazard inventory. Base Level Engineering prepares flood risk information with scalable engineering, allowing FEMA to both assess its current flood hazard inventory and expand the coverage and availability of flood risk information to communities and individuals interested in reviewing their potential flood risk.
Goal: Centralized and available flood hazard analysis to support floodplain management activities and development review, while increasing risk awareness for individuals.
FEMA is working with its Federal and State partners to identify watershed basins in need of flood risk information. Additional watersheds will be invested in each fiscal year, if your community is interested in having watersheds in your vicinity assessed, contact us to let us know of your interest.
Base Level Engineering provides modeling and floodplain extents to assess these unknown and unverified mileage. Additionally, Base Level Engineering results have been prepared to meet all technical, engineering and mapping standards so that it may be used to update FIRMs in the case that the current inventory is not able to be validated.
Watershed-wide Base Level Engineering assessments develop the following flood risk information, available for download through this site:
Additional items may be available for download to include Hazus analysis (county or HUC8 level), Flood Risk Report, and/or Base Level Engineering Technical Report.
FEMA Region 6 is partnered with the InFRM team to work towards a future state where communities throughout the Region have a minimum dataset that describes the flood risk in their vicinity and allows them to determine a Base Flood Elevation. Base Level Engineering information does not replace the information shown on any current effective FIRM panel in a community, but may be used to identify areas a significant change in the floodplain delineation, water surface elevation or depth since the last flood risk study (both reduction and expansion) should be investigated with communities further.
FEMA will coordinate with local communities prior to initiating an update to the existing flood hazard information shown on FIRM panels across the nation.
John Bourdeau, Jr.
Whit E. Montague, CFM
Cindy O'Neal, CFM
Aaron Milligan, CFM, RPES
Veronica Chavez, CFM
Michael Segner, CFM
Manuel J. Razo, GISP, CFM
|Estimated BFE Viewer||
The InFRM Flood Decision Support Toolbox (FDST) is an interactive web application (WebApp) which:
Flood inundation map libraries at USGS streamgaging stations and NWS Advanced Hydraulic Prediction Service (AHPS) forecast points will be built using existing engineering-scale or FEMA base level engineering-scale specifications. For more information on AHPS forecasts, please see: https://water.weather.gov/ahps/about/about.php. The Hydrologic Engineering Center’s (HEC) River Analysis System (RAS) will be the primary numerical modeling tool employed to prepare the inundation mapping products (https://www.hec.usace.army.mil/). HEC-RAS includes the capability for steady flow analysis, unsteady flow analysis and 2-dimensional modeling. HEC-RAS is the current standard for river hydraulic modeling across the United States. There is a vast array of existing HEC-RAS models available for various river systems across Texas. These models include:
Additionally, the FDST will incorporate NWS river forecast models that estimate the quantity and timing of water flowing through selected stream reaches in the United States during flooding events. These forecast models:
The following is a high-level listing of the steps that will be required for execution of this program.
Potential mapping partners may download the FDST Map Submission Guidelines to determine the modeling requirements and steps needed to generate map libraries for their area of interest. The FDST is a ‘living’ viewer that will be continually updated with new models and improvement to the interface. As such, the mapping guidelines will also be a ‘living’ document that will be updated with each update to the web application. Please continue to check the website for the most recent version of the guidelines.
Digital geospatial flood inundation mapping can be a powerful tool for flood risk management. Flood preparedness, communication, warning, response and mitigation can be enhanced by flood inundation mapping that shows floodwater extent and depth over the land surface...
As hydrology remains the single largest source of uncertainty in our understanding of flood risk, the InFRM team has been performing Watershed Hydrology Assessments to update flood risk estimates in large, complex river basins using suites of models developed by USACE.
The InFRM Watershed Hydrology Assessments (WHAs) are performed by an expert team of engineers and scientists from multiple federal agencies using the latest advances in hydrologic science and technology. The watershed assessments examine the hydrology across the entire basin, reviewing non-stationary influences, such as regulation, land use changes, and wet/dry climate variation, to ensure all variables affecting flood risk in the watersheds are considered. The multi-layered analysis employs a range of hydrologic methods, including rainfall runoff modeling, statistical hydrology, and reservoir simulations, and then compares the results of those methods to one another.
The goal of the watershed hydrology assessments is to produce consistent 1% annual chance (100-yr) and other frequency flows across the river basin, based on all available hydrologic information. The results of the hydrology assessments represent the best available estimate of flood risk across the entire river basin and provide suggestions for areas where the current flood hazard information may need to be updated.
River basins within the region are selected for hydrology assessments based on watersheds where USACE already had sufficiently detailed modeling products available as a starting point for the assessments and where FEMA had future floodplain mapping activities scheduled.
InFRM watershed hydrology assessments are currently underway for the following river basins:
Additional basins will be added to the program as funding allows.
This report summarizes new analyses that were completed as part of a study to estimate the 1% annual chance (100-yr) flow, along with other frequency flows, for various stream reaches in the Guadalupe River Basin...
On September 27 of 2018, NOAA’s Hydrometeorological Design Studies Center released a new study called Atlas 14 Volume 11: Precipitation Frequency for Texas. The updated precipitation estimates supersede those currently available for Texas from the 1960s and 1970s. Atlas 14 data help state and local communities prepare for potential flooding and minimize weather's impacts on lives and livelihoods. Precipitation frequency estimates are used by engineers and planners to bring knowledge of flood hazards into land use and development decisions, including managing and designing stormwater infrastructure. Estimates are also used in hydrologic models to delineate flood risks and manage development in floodplains for FEMA’s National Flood Insurance Program. The InFRM team, led by USACE Fort Worth District, helped raise funds and manage this project to see that Texas has the same updated precipitation data as the majority of the nation. The new NOAA Atlas 14 estimates represent vastly improved data in terms of both period of record and station density, state of the art statistical techniques, and a new approach to spatial interpolation that accounts for variation in terrain.
Costs: The approximate cost for the Texas project is $1.5 Million.
Final product: At the end of the three year time frame (2015-2018), NOAA will provide:
Automated information system used by the U.S. Army Corps of Engineers (USACE) to support its water control management mission
View over 750 USGS real-time stream, lake, reservoir, precipitation, and groundwater stations in context with current weather and hazard conditions.
View forecast locations experiencing flooding with links to detailed forecast information.
Oversees federal emergency management for the states of Arkansas, Louisiana, New Mexico, Oklahoma and Texas, and 68 federally recognized tribal nations.
Scroll through a story map about Hurrican Harvey:
the costliest disaster in Texas history.
See forecast tools that show the magnitude and uncertainty of occurrence of floods or droughts, from hours to days and months, in advance.